L6932H1.2TR [STMICROELECTRONICS]

High performance 2A ULDO linear regulator; 高性能2A ULDO线性稳压器


型号：	L6932H1.2TR
厂家：	ST
描述：	High performance 2A ULDO linear regulator 高性能2A ULDO线性稳压器稳压器
文件：	总13页 (文件大小：260K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

L6932H1.2

High performance 2A ULDO linear regulator

Features

■ 2V to 14V input voltage range

■ 200mΩ r

max

DS(on)

HSO-8

■ 200µA quiescent current at any load

■ Excellent load and line regulation

■ Adjustable from 1.2V to 5V

■ 1% voltage regulation accuracy

■ Short circuit protection

Description

The L6932 Ultra Low Drop Output linear regulator

operates from 2V to 14V and is able to support

output current up to 2A. Designed with an internal

50mΩ N-channel Mosfet, it can be used for

onboard DC-DC conversions saving in real

estate, list of components, low noise generation

and power dissipation.

L6932H1.2 is available as adjustable version from

1.2V to 5V with a voltage regulation accuracy of

1%.

■ Thermal shut down

■ HSOP8 package

Applications

■ Motherboards

■ Mobile PC

The upper current limit is fixed at 2.5A to control

the current in short circuit condition within 8%.

The current is sensed in the power mos in order

to limit the power dissipation.

■ Hand-held instruments

■ PCMCIA Cards

■ Processors I/O

■ Chipset and RAM supply

The device is also provided with a thermal shut

down that limits the internal temperature at 150°C

with a histeresys of 20°C. L6932H1.2 provides the

Enable and the Power good functions.

Figure 1. Typical operating circuit

Vin=2V to 14V

Vout=1.2V to 5V

Vin

Vout

PGOOD

L6932H1.2

NC1 NC2

GND

Table 1. Device summary

Part number

Package

Packaging

L6932H1.2

HSO-8

Tube

L6932H1.2TR

Tape and reel

May 2007

Rev 2

1/13

www.st.com

Contents

L6932H1.2

Contents

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1

1.2

Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1

2.2

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Application informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6.1

6.2

6.3

Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Demoboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Component part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7.1

7.2

7.3

Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Loop Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2/13

L6932H1.2

Pin settings

1.1

Pin connection

Figure 2. Pin connection (top view)

NC2

Vin

NC1

GND

PGOOD

Vout

1.2

Pin description

Table 2. Pin description

Name

Pin N°

Description

Enables the device when connected to Vin and disables it when forced to GND.

Supply voltage. This pin is connected to the drain of the internal N-mos.

Connect this pin to a capacitor larger than 10µF.

VIN

Connecting this pin to a voltage divider it is possible to program the output

voltage between 1.2V and 5V.

Regulated output voltage. This pin is connected to the source of the internal N-

mos. Connect this pin to a capacitor of 10µF.

VOUT

Power good output. The pin is open drain and detects the output voltage. It is

forced low if the output voltage is lower than 90% of the programmed voltage.

PGOOD

GND

Ground pin

NC1-

NC2

7, 8

Internally not connected.

3/13

Maximum ratings

L6932H1.2

Maximum ratings

2.1

Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol

Parameter

Value

Unit

V_IN

VIN and PGOOD

EN, OUT and ADJ

14.5

-0.3 to (Vin +0.3)

2.2

Thermal data

Table 4. Thermal data

Symbol

Parameter

Maximum thermal resistance junction-ambient

Maximum junction temperature

Value

Unit

°C/W

°C

34 ⁽¹⁾

150

R_thJA

T_MAX

T_STG

Storage temperature range

-65 to 150

°C

1. Package mounted on board

Block diagram

Figure 3. Internal block diagram

4/13

L6932H1.2

Electrical characteristics

Table 5. Electrical characteristcs (T = 25°C, V = 5V unless otherwise specified)

Symbol

Parameter

Test condition

Min Typ Max Unit

Operating Supply

Voltage

V_IN

V_O

I_O= 0.1A; V_IN= 3.3V

Output voltage

Line Regulation

Load Regulation

1.188 1.2 1.212

V_IN= 2.5V 10%; I_O= 10mA

V_IN= 3.3V 10%; I_O= 10mA

V_IN= 5V 10%; I_O= 10mA

V_IN= 3.3V; 0.1A < I_O< 2A

Drain Source ON

resistance

r_DS(on)

200

mΩ

I_OCC

Current limiting

2.3

2.5

0.2

2.7

0.4

Quiescent current

Shutdown current

µA

2V < V_IN< 14V ⁽¹⁾

Ish

f = 120Hz, I_O= 1A V_IN= 5V,

∆V_IN= 2Vpp

Ripple Rejection

Ven

EN Input Threshold

Pgood threshold

Pgood Hysteresis

Pgood saturation

0.5

0.65

0.8

0.4

Vo rise

%Vo

Ipgood = 1mA

0.2

1. Specification referred to T from -25°C to 125°C.

5/13

Typical electrical performance

L6932H1.2

Typical electrical performance

Figure 4. Output voltage vs

junction temperature

Figure 5. Quiescent current vs

junction temperature

Figure 6. Shutdown current vs

junction temperature

6/13

L6932H1.2

Application information

6.1

Application circuit

Figure 7. Demoboard application circuit

Vin=2V to 14V

Vout=1.2V to 5V

Vin

Vout

PGOOD

L6932H1.2

NC1 NC2

GND

1.2

R₂

-------

× (R₁+ R₂)

V_OUT

6.2

Demoboard layout

Figure 8. Demoboard layout

7/13

Components selection

L6932H1.2

6.3

Component part list

Table 6. Component par list

Reference

Part number

Description

22Uf, 16V

N.M.

Manufacturer

GRM32ER6C226KE20B

MURATA

0Ω

100K

Components selection

7.1

Input capacitor

The input capacitor value depends on a lot of factors such as load transient requirements,

input source (battery or DC/DC converter) and its distance from the input cap. Usually a

47µF is enough for any application but a much lower value can be sufficient in many cases.

7.2

Output capacitor

The output capacitor choice depends basically on the load transient requirements.

Tantalum, Special Polymer, POSCAP and aluminum capacitors are good and offer very low

ESR values. Multilayer ceramic caps have the lowest ESR and can be required for

particular applications. Nevertheless in several applications they are ok, the loop stability

issue has to be considered (see loop stability section).

Below a list of some suggested capacitor manufacturers

Table 7. Suggested capacitor

Manufacturer

MURATA

Type

Cap Value (µF)

1 to 47

Rated Voltage (V)

4 to 16

CERAMIC

POSCAP

PANASONIC

TAYO YUDEN

TDK

1 to 47

4 to 16

1 to 47

4 to 16

1 to 47

4 to 16

TOKIN

1 to 47

4 to 16

SANYO

1 to 47

4 to 16

PANASONIC

KEMET

1 to 47

4 to 16

TANTALUM

1 to 47

4 to 16

8/13

L6932H1.2

Components selection

7.3

Loop Stability

The stability of the loop is affected by the zero introduced by the output capacitor. The time

constant of the zero is given by:

T = ESR × C_OUT

F_ZERP= -----------------------------------------------

2π × ESR × C_OUT

This zero helps to increase the phase margin of the loop until the time constant is higher

than some hundreds of nsec, depending also on the output voltage and current.

So, using very low ESR ceramic capacitors could produce oscillations at the output, in

particular when regulating high output voltages (adjustable version).

To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the

high side resistor of the external divider, as shown in Figure 9.

Figure 9. Compensation network

Vin=2V to 14V

Vout=1.2V to 5V

Vin

Vout

PGOOD

L6932H1.2

NC1 NC2

GND

The thermal resistance junction to ambient of the demoboard is approximately 34°C/W.

This mean that, considering an ambient temperature of 60°C and, a maximum junction

temperature of 150°C, the maximum power that the device can handle is 2.7W.

This means that the device is able to deliver a DC output current of 2A only with a very low

dropout.

9/13

Package mechanical data

L6932H1.2

Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK®

packages. These packages have a Lead-free second level interconnect . The category of

second level interconnect is marked on the package and on the inner box label, in

compliance with JEDEC Standard JESD97. The maximum ratings related to soldering

conditions are also marked on the inner box label. ECOPACK is an ST trademark.

ECOPACK specifications are available at: www.st.com

10/13

L6932H1.2

Package mechanical data

inch

Table 8. HSO-8 Mechanical data

mm.

Dim.

Min

1.35

0.10

1.10

0.33

0.19

4.80

Typ

Max

1.75

0.25

1.65

0.51

0.25

5.00

Min

Typ

Max

0.053

0.04

0.069

0.010

0.065

0.020

0.010

0.197

0.043

0.013

0.007

0.189

3.1

0.122

3.80

4.00

0.150

0.157

2.4

0.094

0.050

1.27

5.80

0.25

0.40

6.20

0.50

1.27

0.228

0.010

0.016

0.244

0.020

0.050

8° (max.)

ddd

0.1

0.04

Figure 10. Package dimensions

11/13

Revision history

L6932H1.2

Revision history

Table 9. Revision history

Date

Revision

Changes

23-Jun-2006

07-May-2007

First release

Final release, mechanical data pad size updated

12/13

L6932H1.2

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13/13

L6932H1.2TR [STMICROELECTRONICS]

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