LTC1628_15 datasheet(9/32 Pages) LINER

Part #	LTC1628

Description	High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9

LTC1628/LTC1628-PG

1628fb

Figure 2

SWITCH

LOGIC

–

+

0.8V

4.8V

5V

VIN

4.5V

BINH

RUN/SS2

RUN/SS1

CLK2

CLK1

0.18

µA

R6

R5

+

–

FCB

+

–

+

–

+

–

+

VREF

MERGE LOGIC

INTERNAL

SUPPLY

3.3VOUT

VSEC

3V

FCB

FLTCPL

EXTVCC

INTVCC

SGND

STBYMD

+

5V

LDO

REG

SW

SHDN

0.55V

TOP

BOOST

TG

CB

CIN

D1

DB

PGND

BOT

BG

INTVCC

VIN

+

CSEC

COUT

VOUT

1628 FD/F02

DSEC

RSENSE

R2

VOSENSE

DROP

OUT

DET

RUN

SOFT

START

BOT

TOP ON

S

R

Q

OSCILLATOR

FREQSET

FCB

EA

0.86V

0.80V

OV

VFB

1.2

µA

6V

R1

–

+

RC

4(VFB)

RST

SHDN

RUN/SS

ITH

CC

CC2

CSS

1.19V

1M

4(VFB)

0.86V

SLOPE

COMP

3mV

+

–

+

SENSE–

SENSE+

INTVCC

30k

45k

2.4V

45k

30k

I1

I2

B

DUPLICATE FOR SECOND

CONTROLLER CHANNEL

+

–

+

PI FU CTIO S

FU CTIO AL DIAGRA

PGOOD: (LTC1628-PG Only) Open-Drain Logic Output.

PGOOD is pulled to ground when the voltage on either

VOSENSE pin is not within ±7.5% of its set point.

NC: These “No Connect” pins are not tied internally to

anything. On the PC layout, these pin landings should be

connected to the SGND plane under the IC.

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LTC1628 Datasheet(PDF) 9 Page - Linear Technology

LTC1628 Datasheet(HTML) 9 Page - Linear Technology

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