A5973AD datasheet(5/19 Pages) STMICROELECTRONICS

Part #	A5973AD

Description	Up to 1.5 A step down switching regulator for automotive applications

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A5973AD

Electical characteristics

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3

Electical 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

4

36

V

RDS(on)

Mosfet on resistance

0.250

0.5

Ω

IL

Maximum limiting

current

VCC= 5 V

1.8

2.3

A

fSW

Switching frequency

430

500

570

kHz

Duty cycle

0

100

%

Dynamic characteristics (see test circuit).

V5

Voltage feedback

4.4 V < VCC < 36 V,

20 mA < I0 < 2 A

1.198

1.235

1.272

V

η

Efficiency

V0 = 5 V, VCC = 12 V

90

%

DC characteristics

Iqop

Total operating

quiescent current

57

mA

Iq

Quiescent current

Duty cycle=0;VFB=1.5 V

2.7

mA

Iqst-by

Total stand-by quiescent

current

Vinh > 2.2 V

50

100

µA

Inhibit

INH threshold voltage

Device ON

0.8

V

Device OFF

2.2

V

Error amplifier

VOH

High level output voltage VFB = 1 V

3.5

V

VOL

Low level output voltage VFB = 1.5 V

0.4

V

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 V

11.5

mA

Ib

Source bias current

2.5

4

µA

DC open loop gain

RL =

∞

50

57

dB

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