L387 [STMICROELECTRONICS]

VERY LOW DROP 5V REGULATOR WITH RESET; 带复位非常低的压差5V稳压器


型号：	L387
厂家：	ST
描述：	VERY LOW DROP 5V REGULATOR WITH RESET 带复位非常低的压差5V稳压器稳压器
文件：	总6页 (文件大小：84K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

L387A

VERY LOW DROP 5V REGULATOR WITH RESET

PRECISE OUTPUT VOLTAGE (5 V ± 4 %)

VERY LOW DROPOUT VOLTAGE

OUTPUT CURRENT IN EXCESS OF 500mA

POWER-ON, POWER-OFF INFORMATION

(RESET FUNCTION)

HIGH NOISE IMMUNITY ON RESET DELAY

CAPACITOR

DESCRIPTION

Pentawatt

The L387A is a very low drop voltage regulator in

a Pentawatt package specially designed to pro-

vide stabilized 5V supplies in consumer and in-

dustrial applications. Thanks to its very low in-

put/output voltage drop this device is very useful

in battery powered equipment, reducing con-

sumption and prolonging battery life. A reset out-

put makes the L387A particularly suitable for mi-

croprocessor systems. This output provides a re-

set signal when power is applied (after an exter-

nal programmable delay) and goes low when

ORDERING NUMBER : L387A

power is removed, inhibiting the microprocessor.

An hysteresis on reset delay capacitor raises the

immunity to the ground noise.

ABSOLUTE MAXIMUM RATINGS

Symbol

V_i

Parameter

Value

Unit

D.C. Input Voltage

Junction and Storage Temperature Range

T_j, T_stg

–55 to 150

°C

APPLICATION CIRCUIT

* Min 33 µF and max. ESR ≤ 3 Ω over temperature range.

1/6

October 1991

L387A

PIN CONNECTION (Top views)

BLOCK DIAGRAM

THERMAL DATA

R _{t h}

Thermal Resistance Junction-case

Max

°C/W

j-ca s e

2/6

L387A

ELECTRICAL CHARACTERISTICS (refer to the test circuit, V = 14.4 V, T_j= 25 °C, C_o= 100 µF;

unless otherwise specified)

Symbol

Parameter

Output Voltage

Test Conditions

Min.

Typ.

Max.

Unit

V_o

I_o= 5 mA to 500 mA T_j= 25 °C

4.80

4.75

5.00

5.20

5.25

– 40 ≤ T_j≤ 125 °C

V_I

Operating Input Voltage

(*), Over Full T Range (– 40 to 125 °C)

(see note **)

∆V_o

Line Regulation

Load Regulation

V_i= 6 V to 26 V

I_o= 5 mA

I_o= 5 mA to 500 mA

V_I– V_oDropout Voltage

V_O= V

– 100 mV

O NOM

I_o= 350 mA

I_o= 500 mA

0.40

0.60

0.65

0.8

I_q

Quiescent Current

I_o= 0 mA

100

I_o= 150 mA

I_o= 350 mA

I_o= 500 mA

160

V_i= 6.2 V

I_o= 500 mA

160

180

∆ V_o

∆ T

Temperature Output

Voltage Drift

– 0.5

mV/°C

SVR

Supply Voltage Rejection I_o= 350 mA

f = 120 Hz

C_o= 100 µF

V_i= 12 V ± 5 V_pp

I_SC

Output Short Circuit

Current

1.2

1.6

V_R

Reset Output Voltage

I_R= 3 mA

I_R= 16 mA

1 < V_o< 4.70 V

1.5 < V_o< 4.75 V

0.5

0.8

Over Full T (– 40 °C ≤ T_j≤ 125 °C)

I_R

t_d

V_{RT (off)}

I_C4

Reset Output Leakage

Current

V_oin Regulation V_R= 5V

Over Full T Range

µA

Delay Time for Reset

Output

Cd = 100 nF

Over Full T Range

V_o@ Reset out H to L Transition, Over

Full T Range

4.75

V_o

– 0.15

Charging Current

(current generator)

V₄= 3 V

V_o

µA

V_{RT (on)}Power on

V_oThreshold

V_o@ Reset out L to H Transition , Over

Full T Range

V_{RT (off)}

+ 0.05 V – 0.04 V

V₄

Comparator Threshold

(pin 4)

V₄@ Reset out H to L Transition

V₄@ Reset out L to H Transition

Over Full T Range

3.2

3.7

3.9

4.3

V_H

Hysteresis Voltage

450

(*) For a DC voltage 26 < Vi < 37 V the device is not operating.

(**) Design limits are guaranteed (but not 100 % production tested) over the indicated temperature and supply voltage ranges.

These limits are not used to calculate outgoing quality levels.

3/6

L387A

Figure 2 : Quiescent Current vs. Output

Figure 1 : Dropout Voltage vs. Output Current.

Current.

Figure 3 : Output Voltage vs. Temperature.

4/6

L387A

PENTAWATT PACKAGE MECHANICAL DATA

inch

DIM.

MIN.

TYP.

MAX.

4.8

MIN.

TYP.

MAX.

0.189

0.054

0.110

0.053

0.022

0.041

0.055

0.142

0.276

0.409

1.37

2.8

2.4

1.2

0.35

0.8

0.094

0.047

0.014

0.031

0.039

0.126

0.260

1.35

0.55

1.05

1.4

3.4

6.8

0.134

0.268

10.4

10.05

0.396

17.85

15.75

21.4

0.703

0.620

0.843

0.886

22.5

2.6

15.1

0.102

0.594

0.236

0.118

0.622

0.260

15.8

6.6

4.5

0.177

0.157

Dia

3.65

3.85

0.144

0.152

Dia.

5/6

L387A

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for

the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its

use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica-

tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre-

viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of SGS-THOMSON Microelectronics.

PENTAWATT is registered trademarks of SGS-THOMSON Microelectronics

SGS-THOMSON Microelectronics GROUP OF COMPANIES

Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore -

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6/6

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