LTC3708EUH datasheet(9/32 Pages) LINER

Part #	LTC3708EUH

Description	Fast 2-Phase, No RSENSE Buck Controller with Output Tracking

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3708

9

3708fb

FUNCTIONAL DIAGRAM

CLOCK DETECTOR

FCB

INTLPF

ION

RON

EXTLPF

PHASE DETECTOR

(PD1)

TO CHANNEL 2 OST

FCNT

ON

SHDN

OV

ENABLE

PHASE DETECTOR

(PD2)

OST

FROM CHANNEL 2

TG

tON =

(10pF)

0.7

IION

R

S

20k

Q

–

+

–

+

ICMP

IREV

TG

CB

M1

L1

VIN

DB

VOUT

+

CIN

SWITCH

LOGIC

SW

SENSE+

DRVCC

BG

PGND

SENSE–

0.66V

0.54V

FROM CHANNEL 2

OV AND UV COMPARATORS

VFB

R2

SGND

BOOST

M2

VCC

CVCC

0.6V

REF

CDRVCC

+

COUT

R1

PGOOD

OV

UV

RUN

SHDN

ENABLE

>100μs

BLANKING

VRNG

1.4V

0.7V

ITH

CC

RC

TRACK

Q4

EA

3.3μA

1

240k

Q1

Q2

Q3

0.6V

VREF

DUPLICATE FOR SECOND

CHANNEL CONTROLLER

NOTE: THE RUN/SS PIN ONLY CLAMPS

VREF FOR PHASE 1 NOT PHASE 2.

+

–

1.3V

RUN/SS

1.2μA

6V

3708 FD

CSS

1.3V

CEPLL

REPLL

RIPLL

CIPLL

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LTC3708EUH Datasheet(PDF) 9 Page - Linear Technology

LTC3708EUH Datasheet(HTML) 9 Page - Linear Technology

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