L5957 datasheet(8/16 Pages) STMICROELECTRONICS

Part #	L5957

Description	Multifunction voltage regulator for car radio

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Electrical specifications

L5957

8/16

Doc ID 14442 Rev 2

ΔVi

Load regulation

Ireg4 = 1 to 800 mA

-

100

mV

Iq

Quiescent current

Ireg4 = 10 mA

-

5

mA

PSRR

Supply voltage ripple rejection

f = 1 kHz; Vin1 = 1.5 Vpp;

Io = 800 mA

48

-

dB

Vdrop

Drop out voltage

Ireg4 = 800 mA

(1)

-

2.65

V

Im

Current limit

Rshort = 0.5 Ω

0.9

-

2

A

Power switch

VdropSW

Drop voltage power switch

IdcSW = 1.8 A max.

-

0.5

V

IpSW1

Peak current power switch

Peak time

< 10 ms

2

-

3.5

A

IpSW2

Peak time

> 40 ms

1

-

2

A

SWDEL

Delay Protection

-

15

-

45

ms

Reset buffer (with push-pull buffer)

RES

RES falling

Vreg2 = 5 V

4.6

4.7

4.8

V

RES

RES rising

Vreg2 = 5 V

4.65

4.8

4.95

V

VHYS(RES)

Hysteresis of reset buffer

-

50

-

200

mV

IHsource (RES) High level source current

Reset = 0 V

1000

1300

1600

μA

ILsink (RES)

Low level sink current

Reset = 5 V

14

16

18

mA

RES delay

Cres = 47nF

-

10

-

60

ms

ΔTRES

Reset rise and fall time

R = 10 k

Ω C = 15 pF

-

50

μs

ICharge

Charge current

CRES = 0 V

3

5

10

μA

IDischarge

Discharge current

CRES = 5 V

1

-

3

mA

VTH(F)

Falling voltage threshold

-

1

1.2

1.4

V

VTH(R)

Rising voltage threshold

-

2.5

2.8

3.5

V

Vol

Low level

ISINK(RES) = 1 mA

0.3

0.5

V

Voh

High level

-

4.5

Vreg2

5.5

V

Hold signal

VlowI

Hold output low for Vin1 low

Low detection

-

9

V

Vlowh

Hold output high for Vin1

normal

Normal high detection

10

-

18

V

Vlowl

Hold output low for Vin1 high

low detection

22

-

V

VHOLD R

Low VIN1 threshold

VIN1 Low TH.

9

9.5

10

V

VHYS (HOLD_L) Hysteresis low TH.

-

50

150

200

mV

VHOLD F

High VIN1 threshold

VIN1 High TH.

182022

V

VHYS (HOLD_M) Hysteresis high TH.

-

50

150

250

mV

Table 4.

Electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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