L5957PD datasheet(8/16 Pages) STMICROELECTRONICS

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Electrical specifications

L5957

8/16

Doc ID 14442 Rev 3

Vi

Load regulation

Ireg4 = 1 to 800 mA

100

Quiescent current

Ireg4 = 10 mA

PSRR

Supply voltage ripple rejection

f = 1 kHz; Vin1 = 1.5 Vpp;

Io = 800 mA

Vdrop

Drop out voltage

Ireg4 = 800 mA

(1)

2.65

Current limit

Rshort = 0.5 

0.9

Power switch

VdropSW

Drop voltage power switch

IdcSW = 1.8 A max.

0.5

IpSW1

Peak current power switch

Peak time

 10 ms

3.5

IpSW2

Peak time

 40 ms

SWDEL

Delay Protection

Reset buffer (with push-pull buffer)

RES

RES falling

Vreg2 = 5 V

4.6

4.7

4.8

RES

RES rising

Vreg2 = 5 V

4.65

4.8

4.95

VHYS(RES)

Hysteresis of reset buffer

200

IHsource (RES) High level source current

Reset = 0 V

1000

1300

1600

A

ILsink (RES)

Low level sink current

Reset = 5 V

RES delay

Cres = 47nF

TRES

Reset rise and fall time

R = 10 k

 C = 15 pF

s

ICharge

Charge current

CRES = 0 V

A

IDischarge

Discharge current

CRES = 5 V

VTH(F)

Falling voltage threshold

1.2

1.4

VTH(R)

Rising voltage threshold

2.5

2.8

3.5

Vol

Low level

ISINK(RES) = 1 mA

0.3

0.5

Voh

High level

4.5

Vreg2

5.5

Hold signal

VlowI

Hold output low for Vin1 low

Low detection

Vlowh

Hold output high for Vin1

normal

Normal high detection

Vlowl

Hold output low for Vin1 high

low detection

VHOLD R

Low VIN1 threshold

VIN1 Low TH.

9.5

VHYS (HOLD_L) Hysteresis low TH.

150

200

VHOLD F

High VIN1 threshold

VIN1 High TH.

182022

VHYS (HOLD_M) Hysteresis high TH.

150

250

Table 4.

Electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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