PM6644 查看數據表（PDF） - STMicroelectronics

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PM6644

350 mA adjustable step-down regulator

STMicroelectronics 

PM6644

Simplified application schematic

1.5

Electrical characteristics

VIN=12 V, no load on REF3, EN=VIN, FB=VCC, R=1 MΩ between TON and VIN, Tj=25 °C

unless otherwise specified.

Table 6. Electrical characteristics

Symbol

Parameter

Test condition

Switching controller output accuracy

BYP

Fixed output voltage valley

regulation

FB=VCC, no load

FB

Adjustable output voltage No load, BYP=3.47 V;

valley regulation (FB=ADJ) Tj=0 °C - 70 °C(1)

Current limit and zero crossing comparator

Valley current limit

Zero crossing current

threshold

SW voltage ramp slew rate = 40

V/ms

3.3 V voltage reference

REF3 output voltage

(VREF3 voltage)

BYP=3.47 V external voltage, no

load

REF3 Line regulation

BYP=3.47 V to 5 V, no load

Load regulation

BYP=3.47 V external voltage, 0

mA < lload < 2 mA

VCC supply

VCC

BYP

VCC voltage

BYP falling threshold/

REF3 turn-off threshold

BYP< BYP falling threshold,

VIN> 6

BYP rising threshold (i.e.

VCC=BYP)/ REF3 turn-on

threshold

Regulator bias currents

VIN shutdown current

EN=0 V

VIN

VIN quiescent current with

BYP > BYP falling

threshold

BYP=3.47 V (not switching),

REF3@no load

BYP

BYP quiescent current with

BYP > BYP falling

threshold

BYP=3.47 V (not switching),

REF3@no load

Fault management

VCC VCC UVLO threshold

Rising edge of PVCC

Falling edge of PVCC

Min.

3.40

0.88

350

14

3.2

3.4

2.4

2.1

Typ. Max. Unit

3.47 3.54

V

0.92

V

380

mA

22

30

mA

3.3

3.4

V

2.3

6.3 mV/V

500

µV

3.8

4.2

V

2.7

V

2.9

3.2

V

13

21

µA

26

35

µA

µA

190 230

2.7

3

V

2.6

V

Doc ID 023203 Rev 1

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