L5973D datasheet(5/17 Pages) STMICROELECTRONICS

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L5973D

Electrical characteristics

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Electrical characteristics

Table 4.

Electrical characteristics

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

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VCC

Operating input

voltage range

Vo = 1.235 V; Io = 2 A

(1)

436

RDS(on)

Mosfet on

Resistance

(1)

0.250

0.5

Ω

Maximum limiting

current

VCC = 4.4 V to 36 V

2.5

3.5

Switching frequency

(1)

212

250

280

kHz

225

250

275

kHz

Duty cycle

100

Dynamic characteristics (see test circuit ).

Voltage feedback

4.4 V < VCC < 36 V,

20 mA < IO < 2 A

1.220

1.235

1.25

(1)

1.198

1.235

1.272

Efficiency

VO = 5 V, VCC = 12 V

DC characteristics

Iqop

Total operating

quiescent current

(1)

Quiescent current

Duty Cycle = 0;

VFB = 1.5 V

2.5

Iqst-by

Total stand-by

quiescent current

Vinh > 2.2 V

(1)

100

µA

VCC = 36 V;

Vinh > 2.2 V

(1)

150

µA

Inhibit

INH threshold

voltage

Device ON

0.8

Device OFF

2.2

Error amplfier

VOH

High level output

voltage

VFB = 1 V

3.5

VOL

Low level output

voltage

VFB = 1.5 V

0.4

Io source

Source output

current

VCOMP = 1.9 V;

VFB = 1 V

200

300

µA

Io sink

Sink output current

VCOMP = 1.9 V;

VFB = 1.5 V

11.5

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