A6902D datasheet(6/12 Pages) STMICROELECTRONICS

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A6902D

Electrical characteristics

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Electrical characteristics

Table 4.

Electrical characteristics (TJ=-40 to 85°C, VCC = 12V, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VCC

Operating input voltage

range

V0=1.235V; I0=2A

RDS(on)

Mosfet on resistance

0.250

0.5

Ω

Maximum limiting

current

VCC=8.5V

2.5

3.2

Operating charging

current

Rsense=0.1Ω

0.92

1.08

fSW

Switching frequency

212

250

280

kHz

Duty cycle

100

Dynamic characteristics (see test circuit).

Voltage feedback

8V<VCC<36V,

20mA<I0<1A

1.198

1.235

1.272

Efficiency

V0=5V, VCC=12V

DC characteristics

Iqop

Total operating

quiescent current

Quiescent current

Duty cycle=0; VFB=1.5V

2.7

Error amplifier

VOH

High level output voltage VFB=1V

3.6

VOL

Low level output voltage VFB=1.5V

0.4

Io source

Source output current

VCOMP = 1.9V;

VFB = 1V

190

300

µA

Io sink

Sink output current

VCOMP = 1.9V;

VFB = 1.5V

11.5

Source bias current

2.5

µA

DC open loop gain

RL=

∞

Transconductance

ICOMP = -0.1mA to

0.1mA; VCOMP = 1.9V

2.3

VOFFS

Input offset voltage

VCS- = 1.8V; VCS+ =

Vcomp

100

110

ICS+

CS+ output current

I0 =1A; RSENSE

=100m

Ω;

VOUT<VCC-2V

1.5

µA

ICS-

CS- output current

I0 =1A; RSENSE

=100m

Ω;

VOUT<VCC-2V

1.5

µA

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