L5972 データシートの表示（PDF） - STMicroelectronics

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L5972

2A SWITCH STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

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

36

V

Vd Dropout voltage

VCC = 4.4V; Io = 1.5A

*

0.375 0.75 V

Il

Maximum limiting current

VCC = 4.4V to 36V

*

2

2.5

3

A

fs

Switching frequency

* 212 250 280 KHz

225 250 275 KHz

Duty cycle

0

100 %

DYNAMIC CHARACTERISTICS (see test circuit ).

V5 Voltage feedback

4.4V < VCC < 36V,

20mA < IO < 1.5A

1.220 1.235 1.25 V

* 1.198 1.235 1.272 V

h

Efficiency

VO = 5V, VCC = 12V

90

%

DC CHARACTERISTICS

Iqop Total operating quiescent current

*

3

5 mA

Iq

Quiescent current

Duty Cycle = 0; VFB = 1.5V

2.5 mA

ERROR AMPLIFIER

VOH High level output voltage

VFB = 1V

3.5

V

VOL Low level output voltage

VFB = 1.5V

0.4 V

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 1.5

mA

Ib Source bias current

2.5

4

µA

DC open loop gain

RL = ∞

50 65

dB

gm Transconductance

Icomp = -0.1mA to 0.1mA

VCOMP = 1.9V

2.3

mS

3/10

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