L5972 datasheet(3/10 Pages) STMICROELECTRONICS

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L5972D

ELECTRICAL CHARACTERISTICS (Tj = 25°C, VCC = 12V, unless otherwise specified.)

(*) Specification Referred to Tj from -40 to 125°C.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VCC

Operating input voltage range

Vo = 1.235V; Io = 1.5A

4.4

Dropout voltage

VCC = 4.4V; Io = 1.5A

0.375

0.75

Maximum limiting current

VCC = 4.4V to 36V

2.5

Switching frequency

212

250

280

KHz

225

250

275

KHz

Duty cycle

100

DYNAMIC CHARACTERISTICS (see test circuit ).

Voltage feedback

4.4V < VCC < 36V,

20mA < IO < 1.5A

1.220

1.235

1.25

1.198

1.235

1.272

Efficiency

VO = 5V, VCC = 12V

DC CHARACTERISTICS

Iqop

Total operating quiescent current

Quiescent current

Duty Cycle = 0; VFB = 1.5V

2.5

ERROR AMPLIFIER

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

1.5

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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