L5973D datasheet(5/21 Pages) STMICROELECTRONICS

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L5973AD

Electrical characteristics

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Electrical characteristics

Table 4. Electrical characteristics

( TJ = 25°C, VCC = 12V, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VCC

Operating input voltage

range

Vo = 1.235V; Io = 2A

436

RDS(on)

Mosfet on Resistance

0.250

0.5

Ω

Maximum limiting

current

VCC = 4.4V to 36V

22.3

Switching frequency

500

KHz

Duty cycle

100

Dynamic characteristics (see test circuit ).

Voltage feedback

4.4V < VCC < 36V,

20mA < IO < 2A

1.220

1.235

1.25

Efficiency

VO = 5V, VCC = 12V

DC characteristics

Iqop

Total operating

quiescent current

Quiescent current

Duty cycle = 0;

VFB = 1.5V

2.7

Iqst-by

Total stand-by

quiescent current

Vinh > 2.2V

100

µA

Inhibit

INH threshold voltage

Device ON

0.8

Device OFF

2.2

Error amplfier

VOH

High level output

voltage

VFB = 1V

3.5

VOL

Low level output

voltage

VFB = 1.5V

0.4

Io source

Source output current

VCOMP = 1.9V;

VFB = 1V

200

300

µA

Io sink

Sink output current

VCOMP = 1.9V;

VFB = 1.5V

11.5

Source bias current

2.5

µA

DC open loop gain

RL = ∞

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