L5953 datasheet(4/24 Pages) STMICROELECTRONICS

4 / 24 page

L5953

4/24

ELECTRICAL CHARACTERISTCS

( Tamb = 25°C, VDD = 14.4V)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

IQ,STBY

Quiescent current with regulators

and High-side drivers off

W1, W2, RES, IRQ, not active;

REG2, HSD1, HSD2, PWM off;

S, C, D fixed at high/low logic

level

100

µA

Tsd

Thermal Shutdown Junction

Temperature

150

°C

SMPS.PWM

Tamb = 25°C, VDD = 14.4V, Vo = 5V; unless otherwise specified.)

Vo,min

Minimum Output Voltage

Io = 200mA

2.4

2.5

2.6

Vo,max

Maximum Output Voltage

Io = 200mA

9.6

10.4

Vref,PWM

Voltage Reference

1.275

Input Voltage Range

Vo = 5V; Io = 0.5A

∆Vo

Line Regulation

Io = 0.5A

100

∆Vo

Load Regulation

Vo = 5V; Io = 0.2A to 0.5A

Dropout Voltage between Pin 19

and Pin 23

Io = 0.5A, Vo = 5V

0.5

Io = 1A, Vo = 5V

ILim

Current Limit

1.5

Efficiency

f = 260kHz; Io = 0.5A

f = 400kHz; Io = 0.5A

SVR

Supply Voltage Ripple Rejection

∆Vi = 1Vrms;

fripple = 300Hz; Io = 0.4A

OSCILLATOR

Swiching frequency

249

260

271

kHz

Swiching frequency

384

400

416

kHz

Voltage Stability of Switching

Frequency

VDD = 8 to 18V

Tbd

Temperature Stability of Switching

Frequency

Tj = -40°C to 85°C

Tbd

SYNC

VIL

Low Input Voltage

0.8

VIH

High Input Voltage

VOL

Low Output Voltage

0.4

VOH

High Output Voltage

ISOURCE=1.5mA

∆f

∆V

---------

∆f

∆T

---------

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