A5972D datasheet(5/11 Pages) STMICROELECTRONICS

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A5972D

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Electrical characteristics

Table 4.

Electrical characteristics

(TJ = -40 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)

With TJ = 85 °C, Ilim_min = 2 A, assured by design, characterization and statistical correlation.

VCC = 5 V

1.8

2.5

VCC = 5 V, TJ = 25 °C

2.5

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

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=50

Transconductance

ICOMP = -0.1 mA to 0.1 mA;

VCOMP = 1.9 V

2.3

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