A6902D_08 datasheet(6/12 Pages) STMICROELECTRONICS

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A6902D

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Electrical characteristics

Table 4.

Electrical characteristics

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

Symbol

Parameter

Test conditions

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

Ω

Maximum limiting

current

VCC = 8.5 V

1.8

2.5

3.2

fSW

Switching frequency

212

250

280

kHz

Duty cycle

100

Dynamic characteristics (see test circuit).

Voltage feedback

8 V < VCC < 36 V,

20 mA < I0 < 1 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

2.7

Error amplifier

VOH

High level output

voltage

VFB=1 V

3.6

VOL

Low level output

voltage

VFB=1.5 V

0.4

Io source

Source output current

VCOMP = 1.9 V;

VFB = 1 V

160

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=

Transconductance

ICOMP = -0.1 mA to 0.1 mA;

VCOMP = 1.9 V

2.3

VOFFS

Input offset voltage

VCS- = 1.8 V;

VCS+ = Vcomp

100

110

ICS+

CS+ output current

I0 =1 A; RSENSE =100 mΩ;

VOUT < VCC-2 V

1.5

µA

ICS-

CS- output current

I0 =1A; RSENSE =100 mΩ;

VOUT < VCC-2 V

1.5

µA

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