A5975AD datasheet(8/50 Pages) STMICROELECTRONICS

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Electrical characteristics

A5975AD

8/50

Doc ID 018761 Rev 1

Electrical characteristics

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

Table 4.

Electrical characteristics

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

VCC = 5 V

3.1

3.6

4.1

fSW

Switching frequency

425

500

575

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

DC characteristics

Iqop

Total operating

quiescent current

Quiescent current

Duty cycle = 0; VFB = 1.5 V

2.7

Iqst-by

Total standby

quiescent current

VINH > 2.2 V

100

µA

VCC = 36 V;

VINH > 2.2 V

100

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

1.5

Source bias current

2.5

µA

DC open loop gain

RL =

∞

Transconductance

ICOMP = -0.1 mA to 0.1 mA;

VCOMP = 1.9 V

2.3

Synch function

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