L5972D datasheet(5/15 Pages) STMICROELECTRONICS

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L5972D

Electrical characteristics

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Electrical characteristics

Table 4.

Electrical characteristics ( TJ = 25°C, VCC = 12V, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VCC

Operating input

voltage range

Vo = 1.235V; Io = 2A

(1)

Specification Referred to TJ from -40 to 125°C. Specification over the -40 to +125 TJ Temperature range

are assured by design, characterization and statistical correlation.

4.4

RDS(on)

Mosfet on

Resistance

(1)

0.250

0.5

Ω

Maximum limiting

current

VCC = 4.4V to 36V

2.5

Switching frequency

(1)

212

250

280

kHz

225

250

275

kHz

Duty cycle

100

Dynamic characteristics (see test circuit ).

Voltage feedback

4.4V < VCC < 36V,

20mA < IO < 2A

1.220

1.235

1.25

(1)

1.198

1.235

1.272

Efficiency

VO = 5V, VCC = 12V

DC characteristics

Iqop

Total operating

quiescent current

(1)

Quiescent current

Duty cycle = 0;

VFB = 1.5V

2.5

Error amplfier

VOH

High level output

voltage

VFB = 1V

3.5

VOL

Low level output

voltage

VFB = 1.5V

0.4

Io source

Source output

current

VCOMP = 1.9V;

VFB = 1V

200

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

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