TLE6389-3G V50_技术文档

TLE6389

Step-Down DC/DC Controller

1

Overview

Features

•

Input voltage range from < 5V up to 60V

Output voltage: 5V fixed or adjustable (7V to 15V)

Output voltage accuracy: 3%

Output current up to 2.3A

100% maximum duty cycle

Less than 120µA quiescent current at low loads1)

2µA max. shutdown current at device off (TLE6389-2GV)

Fixed 360kHz switching frequency

Frequency synchronization input for external clocks

Current Mode control scheme

Integrated output under voltage Reset circuit

On chip low battery detector (on chip comparator)

Automotive temperature range -40°C to 150 °C

Green Product (RoHS compliant)

Product validation

Qualified for automotive applications. Product validation according to AEC-Q100/101.

R_SENSE

=

M1

V_IN

L₁= 47 μH

V_OUT

47mΩ

I_OUT

C_IN1

=

C_OUT

=

C_BDS

=

100 μF

D1

100 μF

220 nF

M1: Infineon BSO613SPV

11

BDS

14

CS

12

GDRV

2

Infineon BSP613P

D1: MotorolaMBRD360

L1: EPCOS B82479-A1473-M

Coilcraft DO3340P-473

3

9

8

FB

13

7

VOUT

VS

R_SI1

=

C

=

IN2

SO

400kΩ

220nF

TLE6389-3 GV50

SI

C

_IN1: Electrolythic

_IN2: Ceramic

C_OUT: Low ESR Tantalum

COMP

C

R_SI2=

SI_GND SI_ENABLE

SYNC GND RO

10

2.2nF 680Ω

100kΩ

6

1

5

4

ON OFF

Datasheet

www.infineon.com

1

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Description

The TLE6389 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1mA up

to 2.5A. A unique PWM/PFM control scheme operates with up to a 100% duty cycle, resulting in very low

dropout voltage. This control scheme eliminates minimum load requirements and reduces the supply current

under light loads to 120µA, depending on dimensioning of external components. In addition the adjustable

version TLE6389-2GV can be shut down via the Enable input reducing the input current to <2µA. The TLE6389

step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications up to

12.5W of output power. A high switching frequency and operation in continuous-conduction mode allow the

use of tiny surface-mount inductors. Output capacitor requirements are also reduced, minimizing PC board

area and system costs. The output voltage is preset at 5V (TLE6389-2GV50 and TLE6389-3GV50) and adjustable

for the TLE6389-2GV. The version TLE6389-2GV50 features a reset function with a threshold between 4.5V and

4.8V, including a small hysteresis of typ. 50mV. In the version TLE6389-3GV50 the device incorporates a reset

with a typ. 1V hysteresis. Input voltages of all TLE6389 can be up to 60V.

Type

Package

Marking

TLE6389-2GV

TLE6389-2GV50

TLE6389-3GV50

PG-DSO-14

6389-2GV

6389-2GV50

6389-3GV50

Datasheet

2

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Table of Contents

1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1

1.2

1.3

Pin Configuration (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Basic Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2

3

4

5

Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6

Detailed circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

PFM/PWM Step-down regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Battery voltage sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Undervoltage Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.1

6.2

6.3

7

7.1

7.2

7.3

7.4

7.5

7.6

7.7

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Output voltage at adjustable version - feedback divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

SI_Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Battery sense comparator - voltage divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Undervoltage reset - delay time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

100% duty-cycle operation and dropout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SYNC Input and Frequency Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Buck converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Buck inductance (L1) selection in terms of ripple current: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Determining the current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

PFM and PWM thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Buck output capacitor (COUT) selection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Input capacitor (CIN1) selection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Freewheeling diode / catch diode (D1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Buck driver supply capacitor (CBDS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Input pi-filter components for reduced EME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Frequency compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Components recommendation - Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Layout recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.8

7.9

7.10

7.10.1

7.10.2

7.10.3

7.10.4

7.10.5

7.10.6

7.10.7

7.10.8

7.10.9

7.11

7.12

8

9

Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Datasheet

3

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

1.1

Pin Configuration (top view)

ENABLE /

SI_ENABLE

1

2

3

4

5

6

7

14

13

12

11

10

9

FB

VOUT

GND

PG-DSO-14

SYNC

SI_GND

SI

8

Figure 1

Pin Configuration

1.2

Basic Block Diagram

ENA

BLE

SI-

GND

VS

SI

RO

SO

VOUT

Battery Sense and

Undervoltage Reset

Internal Power

Supply and

Biasing

BDS

FB

CS

PWM / PFM

Regulator

G

DRV

Driver

COMP

Clock generator

Voltage

Reference

Block

SYNC

TLE 6389GV

GND

Figure 2

Basic Block Diagram

Datasheet

4

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

1.3

Pin Definitions and Functions

Pin No

Symbol

Function

1

ENABLE

Active-High enable input (only at adjustable version, TLE6389-2GV) for the

device.

The device is shut down when ENABLE is driven low. In this shut down-mode the

reference, the output and the external MOSFET are turned off. Connect to logic high

for normal operation.

1

2

SI_ENABLE Active-High enable input (only at 5V version, TLE6389-2GV50 and TLE6389-

3GV50) for SI_GND input.

SI_GND is switched to high impedance when SI_ENABLE is low. High level at

SI_ENABLE connects SI_GND to GND with low impedance. SO is undefined when

SI_ENABLE is low.

FB

Feedback input.

1. For adjustable version (-2GV) connect this pin to an external voltage divider from the

output to GND (see the determining the output voltage, application section).

2. At the 5V fixed output voltage version (-3GV50 and -2GV50) the FB is connected

internally to an on-chip voltage divider. It does not have to be connected externally to

the output.

3

VOUT

Buck output voltage input.

Input for the internal supply. Connect always to the output of the buck converter (output

capacitor).

4

5

GND

Ground connection. Analog signal ground.

SYNC

Input for external frequency synchronization.

An external clock signal connected to this pin allows switching frequency

synchronization of the device. The internal oscillator is clocked then by the frequency

applied at the SYNC input.

6

7

SI_GND

SI

SI-Ground input.

Ground connection for SI comparator resistor divider. Depending on SI_ENABLE this

input is switched to high impedance or low ohmic to GND.

Sense comparator input.

Input of the low-battery comparator. This input is compared to an internal 1.25V

reference where SO gives the result of the comparison. Can be used for any

comparison, not necessarily as battery sense.

8

9

COMP

SO

Compensation input.

Connect via RC-compensation network to GND.

Sense comparator output.

Open drain output from SI comparator at the adjustable version (TLE6389-2GV),

Pull down structure with an internal 20kΩ pull up resistor to VOUT at the 5V version

(TLE6389-2GV50 and TLE6389-3GV50).

10

RO

Reset output.

Open drain output from undervoltage reset comparator at the adjustable version

(TLE6389-2GV),

Pull down structure with an internal 20kΩ pull up resistor to VOUT at the 5V version

(TLE6389-2GV50 and TLE6389-3GV50).

11

12

BDS

Buck driver supply input.

Connect a ceramic capacitor between BDS and VS to generate clamped gate-source

voltage to supply the driver of the PMOS power stage.

GDRV

Gate drive output.

Connect to the gate of the external P-Channel MOSFET. The voltage at GDRV swings

between the levels of VS and BDS.

Datasheet

5

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Pin No

Symbol

Function

13

VS

Device supply input.

Connect a 220nF ceramic cap close to the pin in addition to the low ESR tantalum input

capacitance.

14

CS

Current-sense input.

Connect current-sense resistor between VS and CS. The voltage drop over the sense-

resistor determines the peak current flowing in the buck circuit. The external MOSFET

is turned off when the peak current is exceeded.

Datasheet

6

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

2

Absolute Maximum Ratings

Table 1

Item

Absolute Maximum Ratings

Parameter

Symbol

Limit Values

Unit

Remarks

min.

max.

Device supply input VS

2.1

2.2

Voltage

Current

V_VS

I_VS

-0.3

–

61

V

–

Current sense input CS

2.3

2.4

Voltage

Current

V_CS

I_CS

-0.3

–

61

V

–

|V_VS- V_CS| < 0.3V

–

Gate drive output GDRV

2.5

Voltage

V_GDRV

– 0.3

61

V

-0.3V < |V_VS-V_GDRV| <

6.8V;

-0.3V < |V_BDS- V_GDRV| <

6.8V

2.6

Current

I_GDRV

–

limited internally

Buck driver supply input BDS

2.7

Voltage

V_BDS

– 0.3

–

61

–

V

–

-0.3V < |V_VS- V_BDS| <

6.8V

2.8

Current

I_BDS

Feedback input FB

2.9

Voltage

Current

V_FB

– 0.3

–

6.8

–

V

–

2.10

I_FB

Enable input SI_ENABLE

2.11

Voltage

V_{SI_ENABLE}

– 0.3

–

61

–

V

–

TLE6389-2GV50,

TLE6389-3GV50

2.12

Current

I_{SI_ENABLE}

SI-Ground input SI_GND

2.13

2.14

Voltage

Current

V_{SI_GND}

– 0.3

–

61

–

V

–

I_{SI_GND}

Enable input ENABLE

2.15

2.16

Voltage

Current

V_ENABLE

– 0.3

–

61

–

V

–

TLE6389-2GV

I_ENABLE

Sense comparator input SI

2.17

2.18

Voltage

Current

V_SI

– 0.3

–

61

–

V

–

I_SI

Sense comparator output SO

2.19

2.20

Voltage

Current

V_SO

– 0.3

–

6.8

–

V

–

I_SO

limited internally

TLE6389-2GV

Buck output voltage input VOUT

2.21

2.22

Voltage

V_VOUT

– 0.3

15

V

6.8

TLE6389-2GV50,

TLE6389-3GV50

2.23

Current

I_VOUT

–

mA

Datasheet

7

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

2

Absolute Maximum Ratings

Table 1

Item

Absolute Maximum Ratings

Parameter

Symbol

Limit Values

Unit

Remarks

min.

max.

Compensation input COMP

2.24

2.25

Voltage

Current

V_COMP

– 0.3

–

6.8

–

V

I_COMP

mA

Reset output RO

2.26

2.27

Voltage

Current

V_RO

– 0.3

–

6.8

–

V

I_RO

mA

limited internally

Frequency synchronization input SYNC

2.28

2.29

Voltage

Current

V_SYNC

– 0.3

–

6.8

–

V

I_SYNC

mA

ESD-Protection

2.30

Electrostatic discharge voltage

V_ESD

–1.5

-2

1.5

2

kV

V

HBM¹⁾,

pin VOUT

HBM¹⁾, all pins except

VOUT

2.31

V_ESD

2.32

V_ESDCDM

–500

500

CDM²⁾

Temperatures

2.33

2.34

Junction temperature

Storage temperature

T_j

-40

-50

150

°C

–

T_stg

1) ESD susceptibility HBM according to EIA/JESD 22-A 114B.

2) ESD susceptibility CDM according to JESD 22-C101.

Note:Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

Note:Integrated protection functions are designed to prevent IC destruction under fault conditions described in the

data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are

not designed for continuous repetitive operation.

Datasheet

8

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

3

Operating Range

Item

Parameter

Symbol Limit Values

Unit Remarks

min.

max.

3.1

3.2

Supply voltage range

V_VS

5

7

60

15

V

Output voltage adjust range

TLE6389-2GV

V_OUT

V

TLE6389-2GV

3.3

3.4

Sense Resistor

R_SENSE

10

–

47

mΩ

Calculation see

section 7

PMOS, on+off delay

t_{on+off delay}

t_min-300 ¹⁾ns

t_min= V_VOUT

/

(V_VS*f_SW

)

3.5

3.6

3.7

3.8

3.9

Buck driver supply capacitor

Buck inductance

C_BDS

L1

220

47

–

nF

µH

µF

°C

–

recommended value

Buck inductance

L1

22

100

–

Buck output capacitor

Junction temperature

C_OUT

T_j

100

– 40

150

Thermal Resistance

3.10

3.11

Junction ambient

Junction pin

R_thj-a

R_thj-p

–

140

50

K/W Footprint only

K/W

–

1) A too high PMOS on+off delay might cause an instable output voltage

Note:Within the functional range the IC operates as described in the circuit description. The electrical

characteristics are specified within the conditions given in the related electrical characteristics table.

Datasheet

9

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

min. typ.

Current Consumption¹⁾TLE6389-2GV50 and TLE6389-3GV50

Unit Test Condition

max.

4.1

Current consumption of

VS

I_VS

–

80

150

85

µA

V_VS= 48V;

PFM mode;

4.2

–

70

V_VS= 13.5V;

PFM mode;

T_j= 25 °C

4.3

4.4

Current consumption of

SI_ENABLE

I_{SI_ENABLE}

I_VOUT

–

9

30

µA

V_VS= 48V; V_{SI_ENABLE}= 48V;

PFM mode;

Current consumption of

VOUT

95

130

V_{SI_ENABLE}= L; V_VOUT= 5.5V;

V_VS=13.5V;

PFM mode;

T_j= 25°C

4.5

4.6

–

140

0.2

220

0.5

µA

V_{SI_ENABLE}= H; V_VOUT= 5.5V;

V_VS= 13.5V;

V_SI> V_{SI, high}

;

PFM mode;

Current consumption of

SI

I_SI

V_VS= 13.5V; V_{SI_ENABLE}= H;

V_SI= 10V;

PFM mode;

Current Consumption¹⁾TLE6389-2GV (variable)

4.7

Current consumption of

VS

I_VS

–

80

70

150

85

µA

V_VS= 48V;

V_ENABLE= H;

PFM mode;

V_OUT> 7V

4.8

Current consumption of

VS

–

V_VS= 13.5V; V_ENABLE= H;

PFM mode;

T_j= 25 °C;

V_OUT> 7V

4.9

Current consumption of

VS

–

9

2

µA

V_ENABLE=0V;

T_j< 105°C

4.10

Current consumption of

ENABLE

I_EN

30

V_VS= 48V;

V_ENABLE= H;

PFM mode;

4.11

Current consumption of

VOUT

I_VOUT

–

140

220

µA

V_OUT= 8V;

V_VS= 13.5V; V_ENABLE= H;

V_SI> V_{SI, high}

;

PFM mode;

4.12

4.13

Current consumption of

SI

I_SI

–

0.2

0.5

µA

V_VS= 13.5V; V_ENABLE= H;

V_SI= 10V;

PFM mode; T_j= 25°C

Current consumption of

FB

I_FB

V_VS= 13.5V;

V_FB= 1.25V; V_ENABLE= H;

PFM mode; T_j= 25°C

Datasheet

10

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

Unit Test Condition

min.

typ.

max.

Buck Controller

4.14

4.15

4.16

Output voltage

V_VOUT

4.85

5.00

5.15

V

TLE6389-2GV50, TLE6389-

3GV50;

V_VS=13.5V& 48V; PWM mode

I_OUT= 0.5 to 2A;

R

_SENSE= 22mΩ; R_M1= 0.25Ω;

_L1= 0.1Ω;

4.75

3.8

5.00

5.25

TLE6389-2GV50, TLE6389-

3GV50;

V_VS= 24V;PFM;

I_OUT= 15mA;

R

_SENSE= 22mΩ; R_M1= 0.25Ω;

_L1= 0.1Ω;

–

TLE6389-3GV50;

V_VSdecreasing from 5.8V to

4.2V;

I_LOAD= 0mA to 500mA;

R

_SENSE= 22mΩ; R_M1= 0.4Ω;

_L1= 0.1Ω;

4.17

4.18

FB threshold voltage

Output voltage

V_{FB, th}

V_VOUT

1.225 1.25

9.7 10.0

1.275

10.3

V

TLE6389-2GV

TLE6389-2GV;

Calibrated divider, see section

7.3;

V_VS= 13.5V & 48V;

I_OUT= 0.5 to 2A;

PWM Mode;

R

_SENSE= 22mΩ; R_M1= 0.25Ω;

_L1= 0.1Ω;

4.19

Output voltage

V_VOUT

9.5

10.0

10.5

V

TLE6389-2GV;

Calibrated divider, see section

7.3;

V_VS= 24V;

I_OUT= 15mA;

PFM Mode;

R

_SENSE= 22mΩ; R_M1= 0.25Ω;

_L1= 0.1Ω;

4.20

4.21

Buck output voltage

adjust range

V_VOUT

V_{FB, th}

–

7

V

TLE6389-2GV, supplied by

VS only, complete current to

supply the IC drawn from VS,

no reset function ²⁾

Buck output voltage

adjust range

V_VOUT

7

15

TLE6389-2GV, current to

supply the IC drawn from VS

and VOUT, as specified, ²⁾

Datasheet

11

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

min. typ.

Unit Test Condition

TLE6389-2GV, PWM mode ²⁾

max.

4.22

Buck output voltage

V_VOUT

0.97*V –

1.03*V

OUT_nom

accuracy

OUT_no

m

4.23

4.24

Buck output voltage

accuracy

V_VOUT

0.95*V –

1.05*V

TLE6389-2GV, PFM mode ²⁾

OUT_no

m

OUT_nom

Line regulation

Load regulation

| ΔV_VOUT| –

–

35

50

2.5

–

mV

%

TLE6389-2GV50, TLE6389-

3GV50,

V_VS= 9V to 16V;

I_OUT= 1A;

R_SENSE= 22mΩ;

PWM mode

4.25

4.26

4.27

| ΔV_VOUT| –

–

TLE6389-2GV50, TLE6389-

3GV50,

V_VS= 16V to 32V;

I_OUT= 1A;

R

_SENSE= 22mΩ;

PWM mode

ΔV_VOUT

/V_VOUT

–

TLE6389-2GV,

V_VS= 12V to 36V;

V

_VOUT=10V

_OUT= 1A;

_SENSE= 22mΩ;

PWM mode

I

R

ΔV_VOUT

/ΔI_LOAD

40

mV/A TLE6389-2GV50, TLE6389-

3GV50,

I_OUT= 0.5A to 2A; V_VS= 5.8V &

48V;

R

_SENSE= 22mΩ

4.28

4.29

4.30

4.31

–

8*

–

mV/A TLE6389-2GV, I_OUT= 0.5 to

V_{OUT_nom}

V

/

2A;

V_VS= 13.5V & 48V;

R

_SENSE= 22mΩ

V_{ENABLE/SI_ENABLE}

= 5 V

C_BDS= 220 nF

C_GDRV= 4.7nF

Gate driver,

PMOS off

V_VS

V_GDRV

–

0

–

0.2

8.2

4

V

Gate driver,

PMOS on

V_VS

V_GDRV

–

6

V_{ENABLE/SI_ENABLE}

= 5 V

C_BDS= 220 nF

C_GDRV= 4.7nF³⁾

Gate driver,

UV lockout

V_VS

V_BDS

–

2.75

Decreasing (V_VS-V_BDS) until

GDRV is permanently at VS

level

Datasheet

12

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

Unit Test Condition

min.

typ.

max.

4.32

Gate driver,

peak charging current

I_GDRV

t_r

–

1

–

A

PMOS dependent; ²⁾

4.33

4.34

Gate driver,

peak discharging current

–

1

–

A

Gate driver,

gate voltage, rise time

45

60

ns

V_{ENABLE/SI_ENABLE}

= 5 V

C_BDS= 220 nF

C_GDRV= 4.7nF

4.35

Gate driver,

gate voltage, fall time

t_f

–

50

70

65

ns

V_{ENABLE/SI_ENABLE}

= 5 V

C_BDS= 220 nF

C_GDRV= 4.7nF

4.36

Peak current limit

threshold voltage

V_LIM= V_VS50

– V_CS

90

mV

4.37

4.38

4.39

4.40

Oscillator frequency

Maximum duty cycle

Minimum on time

f_OSC

d_MAX

t_MIN

290

360

–

420

kHz PWM mode only

100

–

%

PWM mode only

220

–

400

530

ns

SYNC capture range

Δf_sync

250

kHz PWM mode only

4.41

4.42

SYNC trigger level high

SYNC trigger level low

V_SYNC,h

4.0

–

V

2)

0.8

Reset Generator

4.43

4.44

4.45

Reset threshold

V_{VOUT, RT}3.5

4.5

3.65

4.65

–

3.8

4.8

–

V

TLE6389-3GV50; V_VOUT

decreasing

V

TLE6389-3GV50; V_VOUT

increasing

Reset headroom

Reset threshold

R_TV,_HEAD80

mV

TLE6389-2GV50;

V

_OUT(V_S=6V,

I_LOAD=1A)

-V_VOUT,RT

4.46

4.47

4.48

4.49

4.50

V_{VOUT, RT}4.5

4.65

50

4.8

–

V

TLE6389-2GV50; V_VOUT

increasing/decreasing

TLE6389-2GV50 ²⁾

Reset threshold

hysteresis

ΔV_VOUT

,

–

mV

V

RT

Reset threshold

V_{FB, RT}

–

1.12

1.17

20

–

TLE6389-2GV; V_VOUT

decreasing

–

V

TLE6389-2GV; V_VOUT

increasing

Reset output pull up

resistor

R_RO

10

40

kΩ

TLE6389-2GV50, TLE6389-

3GV50; Internally connected

to V_OUT

4.51

Reset output High voltage V_{RO, H}

0.8*

V_VOUT

–

V

TLE6389-2GV50, TLE6389-

3GV50; I_RO=0mA

Datasheet

13

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

Unit Test Condition

min.

typ.

max.

4.52

Reset output Low voltage V_RO,L

–

0.2

0.4

V

I_{RO, L}=1mA;

2.5V < V_VOUT< V_RT

4.53

4.54

–

0.2

21

0.4

25

V

I_{RO, L}=0.2mA;

1V < V_VOUT< 2.5V

Reset delay time

t_rd

17

ms

TLE6389-2GV

TLE6389-3GV50

4.55

4.56

Reset delay time

t_rd

t_rr

70

–

82

–

100

10

ms

µs

TLE6389-2GV50

2)

Reset reaction time

Overvoltage Lockout

4.57

Overvoltage threshold

V_{VOUT, OV}

–

V_{OUT_nom}/ –

V +0.1

V

TLE6389-2GV50, TLE6389-

3GV50;

V

_VOUTincreasing

4.58

Overvoltage threshold

V_{FB, OV}

V_{FB,th_nom}/ –

V +0.02

TLE6389-2GV; V_VOUT

increasing

Datasheet

14

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

4

Electrical Characteristics

Table 2

5V < V_VS< 48V; -40°C < T_j< 150°C; All voltages with respect to ground; positive current

defined flowing into the pin; unless otherwise specified

Item Parameter

Symbol Limit Values

Unit Test Condition

min.

typ.

max.

ENABLE Input

4.59

4.60

Enable ON-threshold

Enable OFF-threshold

V_ENABLE,O4.5

–

V

N

V_ENABLE,O

–

0.8

FF

SI_ENABLE Input

4.61

Enable ON-threshold

V_ENABLE,O4.5

–

V

N

4.62

Enable OFF-threshold

V_ENABLE,O

–

0.8

FF

SI_GND Input

4.63

Switch ON resistance

R_SW

50

100

230

Ω

V_{SI_ENABLE}= 5V;

_{SI_GND}= 3mA;

I

Battery Voltage Sense

4.64

4.65

4.66

Sense threshold

V_{SI, low}

V_{SI, high}

V_{SI, hys}

1.22

–

1.25

1.33

80

1.28

–

V

V_VSdecreasing

V_VSincreasing

V

Sense threshold

hysteresis

50

120

mV

4.67

Sense output pull up

resistor

R_SO

10

20

40

kΩ

TLE6389-2GV50, TLE6389-

3GV50; Internally connected

to V_VOUT

4.68

4.69

4.70

Sense out output High

voltage

V_SO,H

V_SO,L

0.8*

V_VOUT

–

V

I_SO,H=0mA

Sense out output Low

voltage

–

0.2

0.4

I_SO,L= 1mA;

2.5V < V_VOUT; V_SI< 1.13 V

–

V_VOUT

/

I_SOL=0.2mA;

V

1V < V_VOUT< 2.5V;

V_SI< 1.13 V

Thermal Shutdown

4.71

Thermal shutdown

junction temperature

T_jSD

150

–

175

30

200

–

°C

2)

4.72

Temperature hysteresis

ΔT

K

1) The device current measurements for I_VSand I_FBexclude MOSFET driver currents.

2) Not subject to production test - specified by design

3) For 4V < V_VS< 6V: V_GDRV≈ 0V.

Datasheet

15

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

5

Typical Performance Characteristics

Current consumption I_VSvs. temperature T_jat enabled

device and V_VS=13.5V

Current consumption I_VOUTvs. temperature T_jat

enabled device and V_VOUT=5.5V

90

I_VS

180

I_VOUT

µA

80

µA

170

70

60

50

40

30

20

160

150

140

130

120

110

-50

-20

10

40

70

100 130 160

-50

-20

10

40

70

100 130 160

T_j

°C

Current consumption I_VSvs. temperature T_jat enabled

device and V_VS=48V

Current consumption I_VOUTvs. temperature T_jat

enabled device and V_VOUT=10V(-2GV)

110

160

I_VS

I_VOUT

µA

100

150

90

80

70

60

50

40

140

130

120

110

100

90

-50

-20

10

40

70

100 130 160

T_j

-50

-20

10

40

70

100 130 160

T_j

°C

Datasheet

16

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Internal oscillator frequency f_OSC

vs. temperature T_j

Peak current limit threshold voltage V_LIMvs.

temperature T_j

110

380

V_LIM

f_OSC

mV

100

kHz

370

90

80

70

60

50

40

360

350

340

330

320

310

-50

-20

10

40

70

100 130 160

-50

-20

10

40

70

100 130 160

T_j

°C

Minimum on time t_MIN(blanking)

vs. temperature T_j

Gate driver supply V_VS- V_BDS

vs. temperature T_j

350

8.6

V_VS-V_BDS

t_MIN

ns

V

325

8.4

300

275

250

225

200

175

8.2

8.0

7.8

7.6

7.4

7.2

-50

-20

10

40

70

100 130 160

-50

-20

10

40

70

100 130 160

T_j

°C

Datasheet

17

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Output voltage V_VOUTvs. temperature T_jin PFM mode

(V_VS=24V,I_Load=15mA,-3GV50)

Lower Reset threshold V_FB,RT

vs. temperature T_j(-2GV)

5.15

V_VOUT

1.14

V_FB,RT

V

1.13

5.10

1.12

1.11

1.10

1.09

1.08

1.07

5.05

5.00

4.95

4.90

4.85

4.80

-50

-20

10

40

70

100 130 160

-50

-20

10

40

70

100 130 160

T_j

°C

Lower Reset threshold V_{VOUT, RT}

vs. temperature T_j(-3GV50)

Internal pull up resistors R_ROand R_SO

vs. temperature T_j(-3GV50)

3.72

V_VOUT,RT

45

R_RO

V

k

Ω

3.70

40

35

30

25

20

15

10

R_SO

k

Ω

3.68

3.66

3.64

3.62

3.60

3.58

-50

-20

10

40

70

100 130 160

-50

-20

10

40

70

100 130 160

T_j

°C

Datasheet

18

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Lower Sense threshold V_{SI, low}

vs. temperature T_j

Output Voltage vs. Load Current, TLE6389-2GV50

7

1.28

TLE 6389-2 GV50

R_SENSE= 50mΩ

V_OUT

V_SI,low

V_VS= 13.5V

App. Circuit Fig. 3

V

6

5

4

3

2

1

0

1.27

1.26

1.25

1.24

1.23

1.22

1.21

-50

-20

10

40

70

100 130 160

0

0.25 0.5 0.75 1.0 1.25 1.5 1.75

I_LOAD

T_j

°C

A

On resistance of SI_GND switch R_SW

vs. temperature T_j

Output Current vs. Load Current, TLE6389-3GV50

7

280

TLE 6389-3 GV50

V_OUT

R_SW

R_SENSE= 50mΩ

V_VS= 13.5V

App. Circuit Fig. 3

V

Ω

6

5

4

3

2

1

0

240

200

160

120

80

40

0

-50

-20

10

40

70

100 130 160

T_j

0

0.25 0.5 0.75 1.0 1.25 1.5 1.75

I_LOAD

°C

A

Datasheet

19

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

Output Voltage vs Load Current

1.4

TLE 6389-2 GV

R_SENSE= 50mΩ

V_VS= 13.5V

V_OUT

V_OUT,nom

1.2

App. Circuit Fig. 3

1.0

0.8

0.6

0.4

0.2

0

0.25 0.5 0.75 1.0 1.25 1.5 1.75

I_LOAD

A

Datasheet

20

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

6

Detailed circuit description

In the following, some internal blocks of the TLE6389 are described in more detail. For the right choice of the

external components please refer to the section application information.

6.1

PFM/PWM Step-down regulator

To meet the strict requirements in terms of current consumption demanded by all Body-and 42V PowerNet

applications a special PFM (Pulse Frequency Modulation) - PWM (Pulse Width Modulation) control scheme for

highest efficiency is implemented in the TLE6389 regulators. Under light load conditions the output voltage is able

to increase slightly and at a certain threshold the controller jumps into PFM mode. In this PFM operation the PMOS

is triggered with a certain on time (depending on input voltage, output voltage, inductance- and sense resistor

value) whenever the buck output voltage decreases to the so called WAKE-threshold. The switching frequency of

the step down regulator is determined in the PFM mode by the load current. It increases with increasing load

current and turns finally to the fixed PWM frequency at a certain load current depending on the input voltage,

current sense resistor and inductance. The diagram below shows the buck regulation circuit of the TLE6389.

VS

CS

VFB, OV

VREF

VDIODE

+

-

+

-

+

-

Current-

sense

Amplifier

Over-

Voltage

Lockout

Over-

Temp.

Shutdown

VS

Blanking

VREF

VFB

+

-

>1

R

S

+

GDRV

&

Q

Error

Amplifier

PWM

Comparator

Level-

shift

Wake-

Comparator

Slope-

compensation

VREF

BDS

PFM

-

VFB, WK

MUX

PWM

SYNC

MODE

Oscillator

Figure 3

Buck control scheme

The TLE6389 uses a slope-compensated peak current mode PWM control scheme in which the feedback or

output voltage of the step down circuit and the peak current of the current through the PMOS are compared to

form the OFF signal for the external PMOS. The ON-trigger is set periodically by the internal oscillator when acting

in PWM mode and is given by the output of the WAKE-comparator when operating in PFM mode. The Multiplexer

(MUX) is switched by the output of the MODE-detector which distinguishes between PFM and PWM by tracking

the output voltage (goto PFM) and by tracking the gate trigger frequency (goto PWM). In PFM mode the peak

current limit is reduced to prevent overshoots at the output of the buck regulator. In order to avoid a gate turn off

signal due to the current peak caused by the parasitic capacitance of the catch diode the blanking filter is

necessary. The blanking time is set internally to 200ns and determines (together with the PMOS turn on and turn

off delay) the minimum duty cycle of the device. In addition to the PFM/PWM regulation scheme an overvoltage

lockout and thermal protection are implemented to guarantee safe operation of the device and of the supplied

application circuit.

Datasheet

21

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

6.2

Battery voltage sense

To detect undervoltage conditions at the battery a sense comparator block is available within the TLE6389. The

voltage at the SI input is compared to an internal reference of typ. 1.25V. The output of the comparator drives a

NMOS structure giving a low signal at SO as soon as the voltage at SI decreases below this threshold. In the 5V

fixed version an internal pull up resistor is connected from the drain of the NMOS to the output of the buck

converter, in the variable version SO is open drain.

The sense in voltage divider can be switched to high impedance by a low signal at the SI_ENABLE to avoid high

current consumption to GND (TLE6389-2GV50 and TLE6389-3GV50 only).

Of course the sense comparator can be used for any input voltage and does not have to be used for the battery

voltage sense only.

6.3

Undervoltage Reset

The output voltage is monitored continuously by the internal undervoltage reset comparator. As soon as the output

voltage decreases below the thresholds given in the characteristics the NPN structure pulls RO low (latched). In

the 5V fixed version an internal pull up resistor is connected from the collector of the NPN to the output of the buck

converter, in the variable version RO is open collector.

At power up RO is kept low until the output voltage has reached its reset threshold and stayed above this threshold

for the power on reset delay time.

Datasheet

22

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

7

Application information

Note:The following information is given as a hint for the implementation of the device only and shall not be

regarded as a description or warranty of a certain functionality, condition or quality of the device.

7.1

General

The TLE6389 step-down DC-DC controllers are designed primarily for use in Automotive applications where high

input voltage range requirements have to be met. Using an external P-MOSFET and current-sense resistor allows

design flexibility and the improved efficiencies associated with high-performance P-channel MOSFETs. The

unique, peak current-limited, PWM/PFM control scheme gives these devices excellent efficiency over wide load

ranges, while drawing around 100µA current from the battery under no load condition. This wide dynamic range

optimizes the TLE6389 for automotive applications, where load currents can vary considerably as individual circuit

blocks are turned on and off to conserve energy. Operation to a 100% duty cycle allows the lowest possible

dropout voltage, maintaining operation during cold cranking. High switching frequencies and a simple circuit

topology minimize PC board area and component costs.

7.2

Typical application circuits

Note:These are very simplified examples of an application circuit. The function must be verified in the real

application

.

R_SENSE

=

M1

V_IN

L₁= 47 μH

V_OUT

47mΩ

I_OUT

C_IN1

=

C_OUT

=

C_BDS

=

100 μF

D1

100 μF

220 nF

M1: Infineon BSO613SPV

11

BDS

14

CS

12

GDRV

2

Infineon BSP613P

D1: MotorolaMBRD360

L1: EPCOS B82479-A1473-M

Coilcraft DO3340P-473

3

9

8

FB

13

7

VOUT

VS

R_SI1=

C

=

IN2

TLE6389-2 GV50

TLE6389-3 GV50

SO

400kΩ

220nF

SI

C : Electrolythic

IN1

COMP

C : Ceramic

IN2

R_SI2=

SI_GND SI_ENABLE

SYNC GND RO

10

2.2nF 680Ω

C

: Low ESR Tantalum

OUT

100kΩ

6

1

5

4

ON OFF

Figure 4

Application circuit TLE6389-2GV50 and TLE6389-3GV50

Datasheet

23

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

R_SENSE

=

M1

V_IN

L₁= 47 μH

V_OUT

47mΩ

to e.g. 5V rail

R_SO

R_RO

C_IN1

=

C_OUT

=

C_BDS

=

100 μF

D1

100 μF

=

220 nF

20kΩ

R_FB1

=

M1: Infineon BSO613SPV

330kΩ

11

BDS

VS

14

CS

12

GDRV

3

Infineon BSP613P

D1: Motorola MBRD360

L1: EPCOS B82479-A1473-M

Coilcraft DO3340P-473

VOUT

13

7

SO

9

toµC

R_SI1

=

C

=

IN2

FB

400kΩ

220nF

TLE6389-2 GV

2

8

C : Electrolythic

2.2nF

IN1

COMP

SI

C : Ceramic

SI_GND ENABLE

SYNC GND

RO

10

C_O^IN_U²_T: Low ESR Tantalum

R_SI2=

R_FB2=

100kΩ

680Ω

6

1

5

4

47kΩ

ON OFF

toµC

Figure 5

Application circuit TLE6389-2GV

7.3

Output voltage at adjustable version - feedback divider

The output voltage is sensed either by an internal voltage divider connected to the VOUT pin (TLE6389-2GV50

and TLE6389-3GV50, fixed 5V versions) or an external divider from the Buck output voltage to the FB pin

(TLE6389-2GV, adjustable version). Pin VOUT has to be connected always to the Buck converter output

regardless of the selected output voltage for the -2GV version.

To determine the resistors of the feedback divider for the desired output voltage V_OUTat the TLE6389-2GV select

R

_FB2between 5kΩ and 500kΩ and obtain R_FB1with the following formula:

V_OUT

⎛

⎞

R_FB1= R_FB2⋅ ---------------- – 1

⎝

⎠

V_{FB, th}

V

_FBis the threshold of the error amplifier with its value of typical 1.25V which shows that the output voltage can

be adjusted in a range from 1.25V to 15V. However the integrated Reset function will only be operational if the

output voltage level is adjusted to >7V.

Also the current consumption will be increased in PFM mode in the range between

1.25V and 7V.

7.4

SI_Enable

Connecting SI_ENABLE to 5V causes SI_GND to have low impedance. Thus the SI comparator is in operation

and can be used to monitor the battery voltage. SO output signal is valid. Connecting SI_ENABLE to GND causes

SI_GND to have high impedance. Thus the SI comparator is not able to monitor the battery voltage. SO output

signal is invalid.

Datasheet

24

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

7.5

Battery sense comparator - voltage divider

The formula to calculate the resistor divider for the sense comparator is basically the same as for the feedback

divider in section before. With the selected resistor R_SI2, the desired threshold of the input voltage V_{IN, UV}and the

lower sense threshold V_{SI, low}the resistor R_SI1is given to:

V_{IN, UV}

V_{SI, low}

⎛

⎞

R_SI1= R_SI2⋅ ------------------ – 1

⎝

⎠

For high accuracy and low ohmic resistor divider values the On-resistance of the SI_GND NMOS (typ. 100Ω) has

to be added to R_SI2

.

7.6

Undervoltage reset - delay time

The diagram below shows the typical behavior of the reset output in dependency on the input voltage V_IN, the

output voltage V_VOUTor V_FB.

V_IN

< t_rr

t

V_VOUT

V_FB

V_{VOUT, RT}

V_FB,RT

t_rr

t

t_rd

V_RO

t_rd

t

thermal

shutdown

under

voltage

over

load

Figure 6

Reset timing

7.7

100% duty-cycle operation and dropout

The TLE6389 operates with a duty cycle up to 100%. This feature allows to operate with the lowest possible drop

voltage at low battery voltage as it occurs at cold cranking. The MOSFET is turned on continuously when the

supply voltage approaches the output voltage level, conventional switching regulators with less than 100% duty

cycle would fail in that case.

Datasheet

25

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

The drop- or dropout voltage is defined as the difference between the input and output voltage levels when the

input is low enough to drop the output out of regulation. Dropout depends on the MOSFET drain-to-source on-

resistance, the current-sense resistor and the inductor series resistance. It is proportional to the load current:

V_drop= I_LOAD⋅ (R_DS(ON)PMOS+ R_SENSE+ R_INDUCTANCE

)

7.8

SYNC Input and Frequency Control

The TLE6389’s internal oscillator is set for a fixed PWM switching frequency of 360kHz or can be synchronized to

an external clock at the SYNC pin. When the internal clock is used SYNC has to be connected to GND. SYNC is

a negative-edge triggered input that allows synchronization to an external frequency ranging between 270kHz and

530kHz. When SYNC is clocked by an external signal, the converter operates in PWM mode until the load current

drops below the PWM to PFM threshold. Thereafter the converter continues operation in PFM mode.

7.9

Shutdown Mode

Connecting ENABLE to GND places the TLE6389-2GV in shutdown mode. In shutdown, the reference, control

circuitry, external switching MOSFET, and the oscillator are turned off and the output falls to 0V. Connect ENABLE

to voltages higher than 4.5V for normal operation. As this input operates analog the voltage applied at this pin

should have a slope of 0.5V/3µs to avoid undefined states within the device.

7.10

Buck converter circuit

A typical choice of external components for the buck converter circuit is given in figure 4 and 5. For basic operation

of the buck converter the input capacitors C_IN1, C_IN2, the driver supply capacitor C_BDS, the sense resistor R_SENSE

,

the PMOS device, the catch diode D1, the inductance L1 and the output capacitor C_OUTare necessary. In addition

for low electromagnetic emission a Pi-filter at the input and/or a small resistor in the path between GDRV and the

gate of the PMOS may be necessary.

7.10.1

Buck inductance (L1) selection in terms of ripple current:

The internal PWM/PFM control loop includes a slope compensation for stable operation in PWM mode. This slope

compensation is optimized for inductance values of 47µH and Sense resistor values of 47mΩ for the 5V output

voltage versions. When choosing an inductance different from 47µH the Sense resistor has to be changed also:

R_SENSE

³-^Ω---

------------------- = ( 0 , 5 . . . 1 , 0 )×10

H

L1

Increasing this ratio above 1000 Ω/H may result in sub harmonic oscillations as well-known for peak current mode

regulators without integrated slope compensation.

To achieve the same effect of slope compensation in the adjustable voltage version also the inductance in µH is

given by

–4

H

VΩ

–4

H

VΩ

⎛

⎝

⎞

⎛

⎞

--------

2,0 × 10

⋅

⋅ V_OUT⋅ R_SENSE< L1 < 4,0 × 10

⋅

⋅ V

⋅ R_SENSE

⎠

⎝

⎠

OUT

Datasheet

26

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

The inductance value determines together with the input voltage, the output voltage and the switching frequency

the current ripple which occurs during normal operation of the step down converter. This current ripple is important

for the all over ripple at the output of the switching converter.

(V_IN– V_OUT) ⋅ V_OUT

ΔI = ------------------------------------------------------

f_SW⋅ V_IN⋅ L1

In this equation f_swis the actual switching frequency of the device, given either by the internal oscillator or by an

external source connected to the SYNC pin. When picking finally the inductance of a certain supplier (Epcos,

Coilcraft etc.) the saturation current has to be considered. The saturation current value of the desired inductance

has to be higher than the maximum peak current which can appear in the actual application.

7.10.2

Determining the current limit

The peak current which the buck converter is able to provide is determined by the peak current limit threshold

voltage V_LIMand the sense resistor R_SENSE. With a maximum peak current given by the application (I_PEAK,

_PWM=I_LOAD+0.5ΔI) the sense resistor is calculated to

V_LIM

R_SENSE= ------------------------------------

2 ⋅ I_{PEAK, PWM}

The equation above takes account for the foldback characteristic of the current limit as shown in the Fig. ’Output

Voltage vs. Load Current’ on page 24/25 by introducing a factor of 2. It must be assured by correct dimensioning

of R_SENSEthat the load current doesn’t reach the foldback part of the characteristic curve.

7.10.3

PFM and PWM thresholds

The crossover thresholds PFM to PWM and vice versa strongly depend on the input voltage V_IN, the Buck

converter inductance L1, the sense resistor value R_SENSEand the turn on and turn off delays of the external PMOS.

7.10.4

Buck output capacitor (C_OUT) selection:

The choice of the output capacitor effects straight to the minimum achievable ripple which is seen at the output of

the buck converter. In continuous conduction mode the ripple of the output voltage can be estimated by the

following equation:

1

⎛

⎞

⎠

V_Ripple= ΔI ⋅ R_ESRCOUT+ -----------------------------------

⎝

8 ⋅ f_SW⋅ C_OUT

From the formula it is recognized that the ESR has a big influence in the total ripple at the output, so low ESR

tantalum capacitors are recommended for the application.

One other important thing to note are the requirements for the resonant frequency of the output LC-combination.

The choice of the components L and C have to meet also the specified range given in section 3 otherwise

instabilities of the regulation loop might occur.

Datasheet

27

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

7.10.5

Input capacitor (C_IN1) selection:

At high load currents, where the current through the inductance flows continuously, the input capacitor is exposed

to a square wave current with its duty cycle V_OUT/V_I. To prevent a high ripple to the battery line a capacitor with

low ESR should be used. The maximum RMS current which the capacitor has to withstand is calculated to:

2

V_OUT

1

3

ΔI

2 ⋅ I_LOAD

⎛

⎞

⎠

-- -----------------------

I_RMS= I_LOAD

⋅

-------------- ⋅ 1 +

V_IN

⋅

⎝

For low ESR an e.g. Al-electrolytic capacitance in parallel to an ceramic capacitance could be used.

7.10.6

Freewheeling diode / catch diode (D1)

For lowest power loss in the freewheeling path Schottky diodes are recommended. With those types the reverse

recovery charge is negligible and a fast hand over from freewheeling to forward conduction mode is possible.

Depending on the application (12V battery systems) 40V types could be also used instead of the 60V diodes. Also

for high temperature operation select a Schottky-diode with low reverse leakage.

A fast recovery diode with recovery times in the range of 30ns can be also used if smaller junction capacitance

values (smaller spikes) are desired.

7.10.7

Buck driver supply capacitor (C_BDS)

The voltage at the ceramic capacitor is clamped internally to 7V, a ceramic type with a minimum of 220nF and

voltage class 16V would be sufficient.

7.10.8

Input pi-filter components for reduced EME

At the input of Buck converters a square wave current is observed causing electromagnetical interference on the

battery line. The emission to the battery line consists on one hand of components of the switching frequency

(fundamental wave) and its harmonics and on the other hand of the high frequency components derived from the

current slope. For proper attenuation of those interferers a π-type input filter structure is recommended which is

built up with inductive and capacitive components in addition to the Input caps C_IN1and C_IN2. The inductance can

be chosen up to the value of the Buck converter inductance, higher values might not be necessary, the additional

capacitance should be a ceramic type in the range up to 100nF.

Inexpensive input filters show due to their parasitrics a notch filter characteristic, which means basically that the

low pass filter acts from a certain frequency as a high pass filter and means further that the high frequency

components are not attenuated properly. To slower down the slopes at the gate of the PMOS switch and get down

the emission in the high frequency range a small gate resistor can be put between GDRV and the PMOS gate.

7.10.9

Frequency compensation

The external frequency compensation pin should be connected via a 2.2nF (>10V) ceramic capacitor and a 680 Ω

(1/8W) resistor to GND. This node should be kept free from switching noise.

Datasheet

28

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

7.11

Components recommendation - Overview

Device

C_IN1

Type

Supplier

various

EPCOS

Coilcraft

Infineon

various

Motorola

various

EPCOS

various

Remark

Electrolytic /Foil type

Ceramic

100μF, 60V

C_IN2

220nF, 60V

L1

B82464-A4473

B82479-A1473-M

DO3340P-473

DO5022P-683

DS5022P-473

BSO 613SPV

BSP 613P

47μH, 1.6A, 145mΩ

47μH, 3.5A, 47mΩ

47μH, 3.8A, 110mΩ

68μH, 3.5A, 130mΩ

47μH, 4.0A, 97mΩ

60V, 3.44A, 130mΩ, NL

60V, 2.9A, 130mΩ, NL

60V, 9A, 250mΩ, LL

220nF, 16V

M1

SPD09P06PL

Ceramic

C_BDS

D1

MBRD360

Schottky, 60V, 3A

Schottky, 40V, 3A

Low ESR Tantalum, 100μF, 10V

see 7.10.9.

MBRD340

SS34

C_OUT

B45197-A2107

Ceramic

C_COMP

7.12

Layout recommendation

The most sensitive points for Buck converters - when considering the layout - are the nodes at the input, output

and the gate of the PMOS transistor and the feedback path.

For proper operation and to avoid stray inductance paths the external catch diode, the Buck inductance and the

input capacitor C_IN1have to be connected as close as possible to the PMOS device. Also the GDRV path from the

controller to the MOSFET has to be as short as possible. Best suitable for the connection of the cathode of the

catch diode and one terminal of the inductance would be a small plain located next to the drain of the PMOS.

The GND connection of the catch diode must be also as short as possible. In general the GND level should be

implemented as surface area over the whole PCB as second layer, if necessary as third layer. The feedback path

has to be well grounded also, a ceramic capacitance might help in addition to the output cap to avoid spikes.

To obtain the optimum filter capability of the input pi-filter it has to be located also as close as possible to the input.

To filter the supply input of the device (VS) the ceramic cap should be connected directly to the pin.

As a guideline an EMC optimized application board / layout is available.

Datasheet

29

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

8

Package Outlines

Figure 7

Outline PG-DSO-14 (Plastic Green Dual Small Outline)

Green Product (RoHS compliant)

To meet the world-wide customer requirements for environmentally friendly products and to be compliant with

government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-

free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).

For further information on alternative packages, please visit our website:

Dimensions in mm

http://www.infineon.com/packages.

Datasheet

30

Rev. 2.2

2018-06-25

TLE6389

Step-Down DC/DC Controller

9

Revision History

Version Date

Rev.2.2 2018-06-20

Changes

Update package outline, page 4 changed pinconfig drawing to PG-DSO-14

Page 1: Marking corrected, chapter 7.10.3: deleted paragraph “For more details...”

Update Layout style

Rev. 2.1 2007-08-13

Rev. 2.0 2006-08-24

Initial version of RoHS-compliant derivate of TLE6389-2/-3

Page 1: AEC certified statement added

Page 1 and Page 30: RoHS compliance statement and green product feature added

Page 1 and Page 30: Package changed to RoHS compliant version

Legal Disclaimer updated

Final Datasheet TLE6389-2/-3

Datasheet

31

Rev. 2.2

2018-06-25

Trademarks

All referenced product or service names and trademarks are the property of their respective owners.

IMPORTANT NOTICE

The information given in this document shall in no For further information on technology, delivery terms

Edition 2018-06-25

Published by

Infineon Technologies AG

81726 Munich, Germany

event be regarded as a guarantee of conditions or and conditions and prices, please contact the nearest

characteristics ("Beschaffenheitsgarantie").

Infineon Technologies Office (www.infineon.com).

With respect to any examples, hints or any typical

values stated herein and/or any information regarding

the application of the product, Infineon Technologies

hereby disclaims any and all warranties and liabilities

of any kind, including without limitation warranties of

non-infringement of intellectual property rights of any

third party.

In addition, any information given in this document is

subject to customer's compliance with its obligations

stated in this document and any applicable legal

requirements, norms and standards concerning

customer's products and any use of the product of

Infineon Technologies in customer's applications.

The data contained in this document is exclusively

intended for technically trained staff. It is the

responsibility of customer's technical departments to

evaluate the suitability of the product for the intended

application and the completeness of the product

information given in this document with respect to

such application.

WARNINGS

Due to technical requirements products may contain

dangerous substances. For information on the types

in question please contact your nearest Infineon

Technologies office.

Do you have a question about any

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Email: erratum@infineon.com

Except as otherwise explicitly approved by Infineon

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Infineon Technologies’ products may not be used in

any applications where a failure of the product or any

consequences of the use thereof can reasonably be

expected to result in personal injury.


型号：	TLE6389-3G V50
厂家：	Infineon
描述：	TLE6389 降压直流-直流开关控制器在 1mA 到 2.5A 整个负载范围具有高效率。独特 PWM/PFM 控制方案具有高达 100% 占空比，从而实现极低的压差。此控制方案无最低负载要求，将轻负载电流降低至 120μA，具体数值取决于外部元件尺寸。此外，可调节型号 TLE6389-2GV 可以通过启用输入关断，使输入电流降低至 <2μA。TLE6389 降压控制器驱动外部 P 通道 MOSFET，支持灵活设计输出功率高达 12.5W 的应用。高开关频率和连续导通模式下工作，支持使用小型表面安装电感器。同时降低输出电容要求，最大限度减小 PC 板面积，降低系统成本。输出电压预先设定为 5V（TLE6389-2GV50 和 TLE6389-3GV50），TLE6389-2GV 输出电压可调节。TLE6389-2GV50 型号具有复位功能，阈值介于 4.5V 和 4.8V 之间，包括少量迟滞，迟滞典型值为 50mV。在 TLE6389-3GV50 型号中，器件复位具有典型值为 1V 的迟滞。所有 TLE6389 输入电压均可高达 60V。开关 PC 驱动控制器电感器
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