3800EFE 데이터 시트보기 (PDF) - Linear Technology

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3800EFE

High-Voltage Synchronous Current Mode Step-Down Controller

Linear Technology 

W

FU CTIO AL DIAGRA

VIN 1

VIN

UVLO

(<4V)

8V

REG

VCC

UVLO

(<6V)

3.8V

INTERNAL

REG

SUPPLY RAIL

–+

FEEDBACK

REFERENCE

1.231V

SHDN 3

BURST_EN 5

BST

UVLO

DRIVE

CONTROL

NOL

SDWRIITVCEH

COLNOTGRICOL

DRIVE

CONTROL

LT3800

16 BOOST

BOOSTED

SWITCH

DRIVER

15 TG

SYNCHRONOUS

SWITCH DRIVER

14 SW

12 VCC

11 BG

10 PGND

VFB 6

VC 7

–+

ERROR

gm

0.5V

AMP

SOFT-START

DISABLE/BURST

ENABLE

1V

1.185V

2µA

CSS 4

–

+

GND 17

QS

OSCILLATOR

R

CURRENT

SENSE

COMPARATOR

–+

Burst Mode

OPERATION

SLOPE COMP

GENERATOR

QR

S

REVERSE

CURRENT

INHIBIT

–+

160mV

10mV

9 SENSE+

8 SENSE–

3800 FD

3800fb

7

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