L387A_03 [STMICROELECTRONICS]

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


型号：	L387A_03
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：246K)
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

Pentawatt^®

DESCRIPTION

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

July 2003

L387A

(Top views)

PIN CONNECTION

BLOCK DIAGRAM

THERMAL DATA

R _{t h j-c a s e}Thermal Resistance Junction-case

Max

°C/W

2/6

L387A

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

ELECTRICAL CHARACTERISTICS

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 _{O NOM}– 100 mV

I_o= 350 mA

0.40

0.60

0.65

0.8

I_o= 500 mA

I_q

Quiescent Current

I_o= 0 mA

I_o= 150 mA

I_o= 350 mA

I_o= 500 mA

100

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

V_R

Output Short Circuit

Current

1.2

1.6

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

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_{RT (off)}

I_C4

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

: Quiescent Current vs. Output

Current.

Figure 2

: Dropout Voltage vs. Output Current.

Figure 1

: Output Voltage vs. Temperature.

Figure 3

4/6

L387A

inch

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

OUTLINE AND

MECHANICAL DATA

L10

4.8

1.37

2.8

1.35 0.047

0.55 0.014

1.19 0.030

1.05 0.031

1.4

3.6

7.0

0.189

0.054

0.110

0.053

0.022

0.047

0.041

0.055

2.4

1.2

0.35

0.76

0.8

1.0

3.2

6.6

0.094

Weight: 2.00gr

0.039

3.4

6.8

0.126 0.134 0.142

0.260 0.268 0.276

0.409

10.4

10.4 0.396

10.05

0.409

17.55 17.85 18.15 0.691 0.703 0.715

15.55 15.75 15.95 0.612 0.620 0.628

21.2

22.3

21.4

22.5

21.6 0.831 0.843 0.850

22.7 0.878 0.886 0.894

1.29

3.0

0.051

0.118

0.622

0.260

0.106

0.189

2.6

15.1

6.0

2.1

4.3

0.102

15.8 0.594

6.6

2.7

4.8

0.236

0.008

0.17

4.23

3.75

4.5

4.0

4.75 0.167 0.178 0.187

4.25 0.148 0.157 0.167

40˚ (typ.)

90˚ (typ.)

3.85 0.144

Dia

Pentawatt V

3.65

0.152

Dia.

L10

RESIN BETWEEN

LEADS

PENTVME

0015981

5/6

L387A

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the conse-

quences 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 STMicroelectronics. Specification mentioned in this

publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi-

croelectronics products are not authorized for use as critical components in life support devices or systems without express written

approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

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6/6

L387A_03 [STMICROELECTRONICS]

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