LTC3882 datasheet(7/20 Pages) LINER

Part #	LTC3882

Description	PolyPhase Step-Down Slave Controller for Digital Power System Management

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3870-1

7

38701f

For more information www.linear.com/LTC3870-1

pin FuncTions

to the PCB ground for electrical connection and rated

thermal performance.

VIN (Pin 17): Main Input Supply. Bypass this pin to GND

with a capacitor (0.1µF to 1µF).

FAULT0/FAULT1(Pin21/Pin20):FaultInputPins.Connect

these pins to the master chip GPIO pins to respond to

fault signals from the master controller. If this pin is low,

the PWM pin is in three-state. There is a 500kΩ pull-down

resistor on FAULT0/FAULT1 internally. These pins have to

be driven high externally for normal operation.

FREQ (Pin 22): Frequency Set Pin. There is a precision

10µA current flowing out of this pin. A resistor to ground

sets a voltage which in turn programs the frequency. This

pin sets the default switching frequency when there is no

externalclockontheSYNCpin. Settingthefrequencyclose

to the external clock helps the internal PLL sync to the

SYNC pin clock quickly and smoothly. See the Application

Section for the detailed information.

block DiagraM

10

11

15

9

24

3

21

23

10µA

SYNC

PHASMD

EXTVCC

INTVCC

IREV

ICMP

INTVCC

ITH0

ILIM

ISENSE0+

ISENSE0–

VCC0

L

ON

3K

REV

UVLO

FCNT

RUN

FAULT

GND

1.7V

RUN0

MODE0

FAULT0

PWM0

VIN

VOUT0

COUT0

CIN

4.8V

FREQ

CC

RC

19

27

17

14

18

1

2

16

SYNC

DET

PHASE

PROGRAM

OSC

PFD

VCO

UVLO

SLOPE

COMPENSATION

ILIM RANGE SELECT

HI: 1:1

LO: 1:1.5

SWITCH

LOGIC

S

R

Q

5.0V

EN

5.0V

EN

+

REF

LDO

–

+

+ –

38701 BD

1

71.1k

500k

DrMOS

(CH0 Shown)

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