PM6644TR datasheet(9/35 Pages) STMICROELECTRONICS

Part #	PM6644TR

Description	350 mA adjustable step-down regulator

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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9 / 35 page

PM6644

Simplified application schematic

Doc ID 023203 Rev 1

9/35

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

Min.

Typ.

Max.

Unit

Switching controller output accuracy

BYP

Fixed output voltage valley

regulation

FB=VCC, no load

3.40

3.47

3.54

V

FB

Adjustable output voltage

valley regulation (FB=ADJ)

No load, BYP=3.47 V;

Tj=0 °C - 70 °C

(1)

0.88

0.92

V

Current limit and zero crossing comparator

Valley current limit

350

380

mA

Zero crossing current

threshold

SW voltage ramp slew rate = 40

V/ms

14

22

30

mA

3.3 V voltage reference

REF3

REF3 output voltage

(VREF3 voltage)

BYP=3.47 V external voltage, no

load

3.2

3.3

3.4

V

Line regulation

BYP=3.47 V to 5 V, no load

2.3

6.3

mV/V

Load regulation

BYP=3.47 V external voltage, 0

mA < lload < 2 mA

500

µV

VCC supply

VCC

VCC voltage

BYP< BYP falling threshold,

VIN> 6

3.4

3.8

4.2

V

BYP

BYP falling threshold/

REF3 turn-off threshold

2.4

2.7

V

BYP rising threshold (i.e.

VCC=BYP)/ REF3 turn-on

threshold

2.9

3.2

V

Regulator bias currents

VIN

VIN shutdown current

EN=0 V

13

21

µA

VIN quiescent current with

BYP > BYP falling

threshold

BYP=3.47 V (not switching),

REF3@no load

26

35

µA

BYP

BYP quiescent current with

BYP > BYP falling

threshold

BYP=3.47 V (not switching),

REF3@no load

190

230

µA

Fault management

VCC

VCC UVLO threshold

Rising edge of PVCC

2.7

3

V

Falling edge of PVCC

2.1

2.6

V

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