B5973D datasheet(5/12 Pages) STMICROELECTRONICS

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B5973D

4/11

Electrical characteristics

Table 4.

Electrical characteristics

(TJ = -40 °C to 125 °C, VCC = 12 V, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VCC

Operating input

voltage range

V0 = 1.235 V; I0 = 2 A

RDS(on)

MOSFET on

resistance

0.250

0.5

Maximum limiting

current (1)

VCC = 5 V

2.25

3.5

VCC = 5 V, TJ = 25 °C

2.5

3.5

fSW

Switching frequency

212

250

280

kHz

Duty cycle

100

Dynamic characteristics (see test circuit).

Voltage feedback

4.4 V < VCC < 36 V,

20 mA < I0 < 2 A

1.198

1.235

1.272

Efficiency

V0 = 5 V, VCC = 12 V

DC characteristics

Iqop

Total operating

quiescent current

Quiescent current

Duty cycle = 0; VFB = 1.5 V

2.5

Iqst-by

Total stand-by

quiescent current

Vinh > 2.2 V

100

μA

VCC = 36 V;

Vinh > 2.2 V

150

μA

Inhibit

INH threshold voltage

Device ON

0.8

Device OFF

2.2

Error amplifier

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

190

300

μA

Io sink

Sink output current

VCOMP = 1.9 V; VFB = 1.5 V

11.5

Source bias current

2.5

μA

DC open loop gain

RL =

∞

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