EM5302AGE [EXCELLIANCE]

5V/12V Synchronous Buck PWM Controller with Reference Input;


型号：	EM5302AGE
厂家：	Excelliance MOS
描述：	5V/12V Synchronous Buck PWM Controller with Reference Input
文件：	总11页 (文件大小：402K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

EM5302/A

5V/12V Synchronous Buck PWM Controller with Reference Input

General Description

Applications

EM5302/A is a synchronous rectified PWM

controller operating with 5V or 12V supply voltage.

This device operates at 200/300 kHz and provides

an optimal level of integration to reduce size and

cost of the power supply.

ꢀ

Notebook & Netbook

Graphic Cards & MB

Low Voltage Logic Supplies

This part includes internal soft start, internal

compensation networks, over current protection,

under voltage protection, and shutdown function.

This part is available in PSOP-8 package.

Pin Configuration

Ordering Information

Part Number

EM5302GE

Package

PSOP-8

Frequency

200kHz

EM5302AGE

PSOP-8

300kHz

Features

Typical Application Circuit

ꢀ

Operate from 5V to 12V Voltage Supply

0.6V V_REFwith 1.5% Accuracy

Support Tracking Mode and Stand Alone

Mode Operation

ꢀ

Voltage Mode PWM Control

200kHz or 300kHz Fixed Frequency

Oscillator

ꢀ

0% to 80% Duty Cycle

Internal Soft Start

Over Current Protection

Integrated Bootstrap Diode

Adaptive Non-Overlapping Gate Driver

Under Voltage Protection

Over Voltage Protection

2012/10/16

Rev.A.5

EM5302/A

Pin Assignment

Pin Name Pin No.

Pin Function

Bootstrap Supply for the floating upper gate driver. Connect the bootstrap

capacitor C _BOOTbetween BOOT pin and the PHASE pin to form a bootstrap circuit.

The bootstrap capacitor provides the charge to turn on the upper MOSFET. Typical

values for C _BOOTrange from 0.1uF to 0.47uF. Ensure that C _BOOTis placed near the

IC.

BOOT

Upper Gate Driver Output. Connect this pin to the gate of upper MOSFET. This pin

is monitored by the adaptive shoot-through protection circuitry to determine when

the upper MOSFET has turned off.

UGATE

GND

Signal and Power Ground for the IC. All voltages levels are measured with respect

to this pin. Tie this pin to the ground island/plane through the lowest impedance

connection available.

Lower Gate Driver Output. Connect this pin to the gate of lower MOSFET. This pin

is monitored by the adaptive shoot-through protection circuitry to determine when

the lower MOSFET has turn off.

LGATE

Supply Voltage. This pin provides the bias supply for the EM5302/A and the lower

gate driver. The supply voltage is internally regulated to 5VDD for internal control

circuit. Connect a well-decoupled 4.5V to 13.2V supply voltage to this pin. Ensure

that a decoupling capacitor is placed near the IC.

VCC

Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor

divider from the output to GND is used to set the regulation voltage.

External Reference Input for Tracking Mode Operation. This pin receives a voltage

with range from 0.4V to 2V as the reference voltage. Pulling this pin lower than

0.3V disables the controller and causes the oscillator to stop, the UGATE and LGATE

outputs to be held low.

REFIN

PHASE Switch Node. Connect this pin to the source of the upper MOSFET and the

drain of the lower MOSFET. This pin is used as the sink for the UGATE driver, and to

monitor the voltage drop across the lower MOSFET for over current protection.

This pin is also monitored by the adaptive shoot-through protection circuitry to

determine when the upper MOSFET has turned off. A Schottky diode between this

pin and ground is recommended to reduce negative transient voltage which is

common in a power supply system.

PHASE

2012/10/16

Rev.A.5

EM5302/A

Function Block Diagram

VCC

Internal

regulator

BOOT

Soft Start

POR

UGATE

PHASE

OTP

Gate

control

logic

PWM

V_OCP

Ramp

VCC

17V

Reference

0.3V

Oscillator

LGATE

GꢀD

65% Vref

REFIꢀ

Enable

130% Vref

2012/10/16

Rev.A.5

EM5302/A

Absolute Maximum Ratings (Note 1)

ꢀ Supply voltage, VCC--------------------------------------------------------------- -0.3V to 16V

ꢀ PHASE to GND

DC------------------------------------------------------------------------------------ -5V to 16V

<200nS------------------------------------------------------------------------------ -10V to 32V

ꢀ BOOT to PHASE--------------------------------------------------------------------- 16V

ꢀ BOOT to GND

DC------------------------------------------------------------------------------------ -0.3V to PHASE+16V

<200nS------------------------------------------------------------------------------ -0.3V to 42V

ꢀ UGATE

DC -----------------------------------------------------------------------------

<200ns------------------------------------------------------------------------- V_PHASE-5V to V_BOOT+5V

ꢀ LGATE

DC-------------------------------------------------------------------------------

<200ns-------------------------------------------------------------------------

V_PHASE-0.3V to V_BOOT+ 0.3V

-0.3V to VCC + 0.3V

-5V to VCC+5V

ꢀ REFIN & FB--------------------------------------------------------------------------- -0.3V to 6V

ꢀ Power Dissipation, PD @ TA = 25°C, PSOP-8 ------------------------------- 1.33W

ꢀ Package Thermal Resistance, ΘJA, PSOP-8 _{(Note 2)}--------------------------- 75°C/W

ꢀ Junction Temperature------------------------------------------------------------ 150°C

ꢀ Lead Temperature (Soldering, 10 sec.)--------------------------------------- 260°C

ꢀ Storage Temperature Range---------------------------------------------------- -65°C to 150°C

ꢀ ESD susceptibility_(Note3)

HBM (Human Body Mode)----------------------------------------------------- 2KV

MM (Machine Mode)----------------------------------------------------------- 200V

Recommended Operating Conditions _(Note4)

ꢀ Supply Voltage, V_CC------------------------------------------------------------ 4.5V to 13.2V

ꢀ Junction Temperature -------------------------------------------------------- -40°C to 125°C

ꢀ Ambient Temperature -------------------------------------------------------- -40°C to 85°C

Electrical Characteristics

V_CC=12V, T_A=25℃, unless otherwise specified

Parameter

Symbol

Test Conditions

Pin Min Typ Max Units

Supply Input Section

Supply Voltage

V_CC

I_CC

4.5

13.2

4.4

Supply Current

LGATE, UGATE open, Switching.

No Switching.

Quiescent Supply Current

Power on Reset Threshold

Power on Reset Hysteresis

I_CCQ

V_CCRTH

V_CCHYS

4.2

0.2

Internal Oscillator

2012/10/16

Rev.A.5

EM5302/A

170 200 230 kHz

255 300 345 kHz

EM5302

Free Running Frequency

F_SW

EM5302A

Ramp Amplitude

△V_OSC

V_p-p

Error Amplifier

Open Loop DC Gain

Gain-Bandwidth Product

Slew Rate

A_OGuaranteed by Design

GBW Guaranteed by Design

SR Guaranteed by Design

g_mGuaranteed by Design

MHz

V/us

Trans-conductance

PWM Controller Gate Drivers

0.2 0.7

V_BOOT- V_PHASE= 12V,

I_{UG_SRC}

Upper Gate Sourcing Current

Upper Gate Sinking Current

Upper Gate R_DS(ON)Sinking

-1

V_BOOT- V_UGATE= 6V

V_BOOT- V_PHASE= 12V,

I_{UG_SNK}

1.5

V_UGATE– V_PHASE= 6V

V_BOOT- V_PHASE= 12V,

R_{UG_SNK}

V_UGATE– V_PHASE= 0.1V

Lower Gate Sourcing Current

Lower Gate Sinking Current

Lower Gate R_DS(ON)Sinking

PHASE Falling to LGATE Rising

Delay

I_{LG_SRC}V_CC– V_LGATE= 6V

I_{LG_SNK}V_LGATE= 6V

-1

1.5

R_{LG_SNK}V_LGATE= 0.1V

V_CC= 12V; V_PHASE< 1.2V to

V_LGATE> 1.2V

LGATE Falling to UGATE Rising

Delay

V_CC= 12V; V_LGATE< 1.2V to

(V_UGATE- V_PHASE) > 1.2V

Reference Voltage

Nominal Feedback Voltage

V_FBStand Alone Mode

|V_REFIN-V_FB|, Tracking Mode,

V_REFIN=0.4V ~ 1V

0.591 0.6 0.609

Output Voltage Accuracy

|V_REFIN-V_FB|, Tracking Mode,

V_REFIN=1V ~ 2V

1.5

Enable Voltage

REFIN Enable Threshold

Protection section

V_EN

0.3 0.35

FB Under Voltage Protection

FB Over Voltage Protection

VCC Over Voltage Protection

Over Current Threshold

Soft-Start Interval

V_{FB_UVP}FB falling

115 130 145

16 17 18

V_{FB_OVP}FB rising

V_{CC_OVP}

V_OCP

T_SS

-425 -375 -325 mV

2.4 3.6 5.4

150 165

℃

Temperature Shutdown

T_SDGuaranteed by Design

Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2.

_JAis measured in the natural convection at T_A=25^oC on a 4-layers high effective thermal conductivity test board with

minimum copper area of JEDEC 51-7 thermal measurement standard. The case point of θ_JCis on the expose pad for

PSOP-8 package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

2012/10/16

Rev.A.5

EM5302/A

Typical Operating Characteristics

Power On Waveform

Turn On from REFIN

V_IN

V_REFIN

V_OUT

LGATE

I_Lx

LGATE

I_Lx

V_IN=12V，V_OUT=1.2V，C_OUT=1000uF，No Load. V_IN=12V，V_OUT=1.2V，C_OUT=1000uF，No Load.

Turn Off from REFIN

Switching Waveforms: UGATE Turn On

V_OUT

UGATE

V_REFIN

PHASE

UGATE - PHASE

LGATE

I_Lx

LGATE

V_IN=12V，V_OUT=1.2V，C_OUT=1000uF，I_OUT=6A.

V_IN=12V，I_OUT=10A

Switching Waveforms: UGATE Turn Off

Power Sequencing Operation

UGATE

V_IN

PHASE

V_OUT

UGATE-PHASE

LGATE

V_IN=12V，I_OUT=10A

V_CC=12V Ready，V_OUT= 1.2V, C_OUT= 1000uF,

No Load.

2012/10/16

Rev.A.5

EM5302/A

Load Transient Response

Over Current Protection

I_OUT

Phase

V_OUT

Phase

I_OUT

V_IN=12V，V_OUT=1.2V，C_OUT=1000uF.

V_IN=12V, V_OUT=1.2V, C_OUT=1000uF.

Output short Ground

Over Current Protection

REFIN Operation

Phase

V_OUT

I_OUT

V_REFIN

V_IN=12V, V_OUT=1.2V, C_OUT=1000uF.

Turn On to Short Circuit

V_IN=12V, V_OUT=1.2V, C_OUT=1000uF, I_OUT=6A

Line Regulation

Switching Frequency vs. Input Voltage

Input Voltage (V)

2012/10/16

Rev.A.5

EM5302/A

Load Regulation

Output Voltage vs. Junction Temperature

Output current (A)

Junction Temperature (℃)

Switching Frequency vs. Junction

Temperature

Junction Temperature (℃)

2012/10/16

Rev.A.5

EM5302/A

Functional Description

When OCP is triggered, EM5302/A will shut down

the converter and cycles the soft start function in a

hiccup mode. If over current condition still exist

after 3 times of hiccup, EM5302/A will shut down

the controller and latch.

EM5302/A is a voltage mode synchronous buck

PWM controller. The compensation circuit is

implemented internally to minimize the external

component count. This device provides complete

protection function such as over current protection,

under voltage protection and over voltage

protection.

UVP, Under Voltage Protection

The FB voltage is monitored for under voltage

protection. The UVP threshold is typical 0.4V.

When UVP is triggered, EM5302/A will shut down

the converter and cycles the soft start function in a

hiccup mode.

Supply Voltage

The V_CCpin provides the bias supply of EM5302/A

control circuit, as well as lower MOSFET’s gate and

the BOOT voltage for the upper MOSFET’s gate. A

minimum 0.1uF ceramic capacitor is recommended

to bypass the supply voltage.

OVP, Over Voltage Protection

The FB voltage is monitored for over voltage

protection. The OVP threshold is typical 0.8V.

When OVP is triggered, EM5302/A will turn off

upper MOSFET and turn on lower MOSFET.

Power ON Reset

To let EM5302/A start to operation, V_CCvoltage

must be higher than its POR voltage even when

REFIN voltage is pulled higher than enable high

voltage. Typical POR voltage is 4.2V.

Output Inductor Selection

The output inductor is selected to meet the output

voltage ripple requirements and minimize the

response time to the load transient. The inductor

value determines the current ripple and voltage

ripple. The ripple current is approximately the

following equation:

Enable

To let EM5302/A start to operation, REFIN voltage

must be higher than its enable voltage. Typical

enable voltage is 0.3V.

Reference Voltage Select

V − V_OUT

V_OUT

The REFIN Voltage is compared with 3V to select

the reference voltage with 1ms delay after chip

enable. The external reference input is selected if

REFIN is smaller than 3V.

ΔI_L=

∗

V *F

Output Capacitor Selection

An output capacitor is required to filter the output

and supply the load transient. The selection of

output capacitor depends on the output ripple

voltage. The output ripple voltage is approximately

bounded by the following equation:

Soft Start

EM5302/A provides soft start function internally.

The FB voltage will track the internal soft start

signal, which ramps up from zero during soft start

period.

ΔV_OUT= ΔI_L*(ESR +

)

OCP, Over Current Protection

8*F * C_OUT

The over current function protects the converter

from a shorted output by using lower MOSFET’s

on-resistance to monitor the current. The OCP level

can be calculated as the following equation:

Input Capacitor Selection

Use a mix of input bypass capacitors to control the

voltage overshoot across the MOSFET. Use small

ceramic capacitors for high frequency decoupling

and bulk capacitors to supply the current needed

each time the upper MOSFET turn on. Place the

V_OCP

I_OCP= −

R_DS(ON)

2012/10/16

Rev.A.5

EM5302/A

small ceramic capacitors physically close to the

MOSFETs and between the drain of the upper

MOSFET and the source of the lower MOSFET. The

important parameters of the input capacitor are

the voltage rating and the RMS current rating.

The capacitor voltage rating should be at least 1.25

times greater than the maximum input voltage and

a voltage rating of 1.5 times is a conservative

guideline. The RMS current rating requirement can

be expressed as the following equation:

on-resistance, breakdown voltage, gate supply

requirement,

requirements.

and

thermal

management

In high current applications, the MOSFET power

dissipation, package selection and heat sink are the

dominate design factor. The power dissipation

includes two loss components: conduction loss and

switching loss. The conduction losses are the

largest component of power dissipation for both

the upper and lower MOSFETs. These losses are

distributed between the two MOSFETs according

to duty factor.

I_RMS= I_OUTD(1 -D)

The power dissipations in the two MOSFETs are

approximately the following equation:

For a through hole design, several electrolytic

capacitors may be needed. For surface mount

designs, solid tantalum capacitors can also be used

but caution must be exercised with regard to the

capacitor surge current rating. These capacitors

must be capable of handling the surge current at

power-up. Some capacitor series available from

reputable manufacturers are surge current tested.

PD_UPPER= I²_OUT*R_DS(ON)*D + 0.5*I_OUT*V *F *t_SW

PD_LOWER= I²_OUT*R_DS(ON)*(1 - D)

Where D is the duty cycle, t_SWis the combined

switch ON and OFF time.

Power MOSFET Selection

The EM5302/A requires two N-Channel power

MOSFETs. These should be selected based upon

2012/10/16

Rev.A.5

EM5302/A

Ordering & Marking Information

Device Name: EM5302GE/EM5302AGE for PSOP-8

EM5302GE Device Name

5302

ABCDEFG

ABCDEFG: Date Code

5302A

EM5302AGE Device Name

ABCDEFG

ABCDEFG: Date Code

Outline Drawing

Dimension in mm

Dimension

Min.

4.70 3.70 5.80 0.33

1.20 0.02 0.40 0.19 0.25 0∘ 1.94 1.94

Typ.

1.27

Max.

5.10 4.10 6.20 0.51

1.62 0.15 0.83 0.26 0.50 8∘ 2.49 2.49

2012/10/16

Rev.A.5

EM5302AGE [EXCELLIANCE]

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