Datasheet L387A Datasheet (SGS Thomson Microelectronics)

VERY LOW DROP 5V REGULATOR WITH RESET

.PRECISEOUTPUT VOLTAGE(5 V ± 4%)

.VERYLOW DROPOUTVOLTAGE

.OUTPUTCURRENT INEXCESSOF 500mA

.POWER-ON, POWER-OFF INFORMATION

(RESET FUNCTION)

.HIGH NOISE IMMUNITY ON RESET DELAY

CAPACITOR

L387A

DESCRIPTION

The L387A is a very low drop voltage regulator in
a Pentawatt
vide stabilized 5V supplies in consumer and in­dustrial applications. Thanks to its very low in­put/output voltage drop this device is very useful
in battery powered equipment, reducing con­sumption and prolonging battery life. A reset out­put makes the L387A particularly suitable for mi­croprocessor systems. This output provides a re­set signal when power is applied (after an exter­nal programmable delay) and goes low when

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

T

j,Tstg

APPLICATION CIRCUIT



package specially designed to pro-

ORDERING NUMBER : L387A

power is removed, inhibiting the microprocessor.
An hysteresis on reset delay capacitor raises the
immunity to the ground noise.

V

D.C. Input Voltage 35 V

i

Junction and StorageTemperatureRange –55 to 150 °C

Pentawatt



* Min33 µF and max.ESR ≤ 3 Ω over temperaturerange.

October1991

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L387A

PIN CONNECTION (Top views)

BLOCK DIAGRAM

THERMAL DATA

R

2/6

t h j-ca se

Thermal Resistance Junction-case Max 4 °C/W

L387A

ELECTRICAL CHARACTERISTICS (refer to the test circuit, Vi= 14.4 V, Tj=25°C, Co= 100 µF;

unless otherwisespecified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage Io= 5 mA to 500 mA Tj=25°C

V

o

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

V

I

–40≤T

≤125 °C

j

4.80

4.75

(see note **)

∆V
∆V

V

I–Vo

∆ V

∆ T

SVR Supply Voltage Rejection I

Line Regulation Vi=6Vto26V Io=5mA 5 50 mV

o

Load Regulation Io= 5 mA to 500 mA 15 60 mV

o

Dropout Voltage VO=V

= 350 mA

I

o

= 500 mA

I

o

Quiescent Current Io=0mA

I

q

= 6.2 V Io= 500 mA 160 180 mA

V

i

Temperature Output

o

O NOM

– 100 mV

= 150 mA

I

o

I

= 350 mA

o

= 500 mA

I

o

Voltage Drift

= 350 mA f = 120 Hz

o

Output Short Circuit

I

SC

= 100 µFV

C

o

=12V±5V

i

pp

Current
Reset Output Voltage IR= 3 mA 1 < Vo< 4.70 V

V

V

RT (off)

R

Reset Output Leakage

I

R

Current
Delay Time for Reset

t

d

Output

I

= 16 mA 1.5 < Vo< 4.75 V

R

Over Full T (– 40 °C ≤ T

≤ 125 °C)

j

Voin Regulation VR=5V
Over Full T Range

Cd = 100 nF
Over Full T Range

Vo@ Reset out H to L Transition, Over

4.75 V

Full T Range

Charging Current

I

C4

V4=3V 102030µA

(current generator)

V

RT (on)

Power on
V

Threshold

o

Comparator Threshold

V

4

(pin 4)
Hysteresis Voltage Over Full T Range 450 mV

V

H

(*) For a DC volt age 26 < Vi < 37 V the d evic e is not operating.
(**) Design lim i ts are guaranteed (but not 100 % production tested) over the indicated t emperat ure and supply voltage ranges.

These limits are not used to calculate outgoing quality levels.

@ Reset out L to H Transition , Over

V

o

Full T Range
V4@ Reset out H to L Transition 3.2 3.9 V

@ Reset out L to H Transition 3.7 4.3 V

V

4

5.00

5.00

5.20

5.25
26 V

0.40

0.60

20
60

100

0.65

0.8

5

15
35

100
160

mA
mA
mA
mA

– 0.5 mV/°C

60

1.2 1.6 A

0.5

0.8

50 µA

25 ms

o

– 0.15

V

RT (off)

+0.05V

V

o

–0.04V

V
V

V
V

V
V

V

V

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L387A

Figure 1 : Dropout Voltage vs. Output Current.

Figure 3 : OutputVoltage vs. Temperature.

Figure 2 : Quiescent Current vs. Output

Current.

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PENTAWATT PACKAGE MECHANICAL DATA

L387A

DIM.

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

mm inch

A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110

D1 1.2 1.35 0.047 0.053

E 0.35 0.55 0.014 0.022
F 0.8 1.05 0.031 0.041

F1 1 1.4 0.039 0.055

G 3.4 0.126 0.134 0.142
G1 6.8 0.260 0.268 0.276
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409

L 17.85 0.703
L1 15.75 0.620
L2 21.4 0.843
L3 22.5 0.886
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260

M 4.5 0.177
M1 4 0.157
Dia 3.65 3.85 0.144 0.152

A

H3

L

L1

C

D1

Dia.

L7

L6

D

L2
L3L5

F1

H2

E

MM1

G1

G

F

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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. Specifica­tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre­viously 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

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Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.



 1994 SGS-THOMSON Microelectronics - All Rights Reserved

is registered trademarks of SGS-THOMSON Microelectronics

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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