LTC1708EG-PG datasheet(9/32 Pages) LINER

Part #	LTC1708EG-PG

Description	Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck Regulator Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9

LTC1708-PG

FU CTIO AL DIAGRA

Figure 2

PI FU CTIO S

BOOST1, BOOST2 (Pins 33, 26): Bootstrapped Supplies

to the Topside Floating Drivers. Capacitors are connected

between the boost and switch pins and Schottky diodes

are tied between the boost and INTVCCpins. Voltage swing

at the boost pins is from INTVCC to (VIN + INTVCC).

SW1, SW2 (Pins 34, 25): Switch Node Connections to

Inductors. Voltage swing at these pins is from a Schottky

diode (external) voltage drop below ground to VIN.

TG1, TG2 (Pins 35, 24): High Current Gate Drives for Top

N-Channel MOSFETs. These are the outputs of floating

drivers with a voltage swing equal to INTVCC – 0.5V

superimposed on the switch node voltage SW.

PGOOD (Pin 36): Open-Drain Logic Output. PGOOD is

pulled to ground when the voltage at either EAIN pin is not

within 7.5% of the setpoint.

SWITCH

LOGIC

–

+

0.8V

4.8V

5V

VIN

4.5V

BINH

0.86V

0.74V

0.86V

VFB1

CLK2

CLK1

0.17

µA

+

–

+

–

+

–

+

–

+

–

FCB

+

–

+

–

+

–

+

VREF

INTERNAL

SUPPLY

EACH VID

INPUT

3.3VOUT

VSEC

FCB

EXTVCC

INTVCC

SGND

STBYMD

5-BIT VID DECODER

+

5V

LDO

REG

SW

SHDN

0.6V

TOP

BOOST

TG

CB

CIN

D1

DB

PGND

BOT

BG

INTVCC

VIN

+

CSEC

COUT

VOUT

1708 F02

DSEC

RSENSE

EAIN

VFB2

DROP

OUT

DET

RUN

SOFT-

START

BOT

TOP ON

S

R

Q

OSCILLATOR

FREQSET

FCB

EA

0.860V

0.800V

OV

VFB

1.2

µA

6V

–

+

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

ATTNIN

VID0

ATTNOUT

PGOOD

DUPLICATE FOR SECOND

CONTROLLER CHANNEL

+

–

+

R2

10k

R1

VARIABLE

VID1 VID2 VID3 VID4

40k

VIDVCC

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LTC1708EG-PG Datasheet(PDF) 9 Page - Linear Technology

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