A5974D datasheet(6/46 Pages) STMICROELECTRONICS

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Electrical characteristics

A5974D

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DocID018774 Rev 2

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

212

250

280

kHz

Duty cycle

100

Dynamic characteristics

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

2.5

Iqst-by

Total standby quiescent current

Vinh > 2.2 V

100

A

VC C = 36 V; Vinh > 2.2 V

100

A

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

A

Io sink

Sink output current

VCOMP = 1.9 V; VFB = 1.5 V

1.5

Source bias current

2.5

A

DC open loop gain

RL = 

Transconductance

ICOMP = -0.1 mA to 0.1 mA;

VCOMP = 1.9 V

2.3

Synch function

High input voltage

VCC = 4.4 to 36 V

2.5

VREF

Low input voltage

VCC = 4.4 to 36 V

0.74

Slave synch current(1)

Vsynch = 0.74 V, Vsynch = 2.33 V

0.11

0.21

0.25

0.45

Master output amplitude

Isource = 3 mA

2.75

Output pulse width

no load, Vsynch = 1.65 V

0.20

0.35

s

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