LTC3770 datasheet(9/24 Pages) LINER

Part #	LTC3770

Description	Synchronous Controller with Margining, Tracking and PLL

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Manufacturer	LINER [Linear Technology]

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9

LTC3770

3770f

80% • VREFIN

2.0V

0.5V

VRNG

1

–

+

–

+

–

+

7

31

ION

29 FCB

14 VIN

1µA

RON

VVON

IION

tON =

(10pF)

R

SQ

20k

ICMP

IREV

×

Q6

3.3µA

RUN

SWITCH

LOGIC

AND

ANTI-

SHOOT

THROUGH

BG

ON

FCNT

F

0.6V

OV

1

240k

Q1

Q2

1.5V

ITH

RC

CC1

EA

SS

Q4

3

8

9

11

SGND

R2

R1

RUN

PGND

22

PGOOD

32

DRVCC

20

INTVCC

19

SW

25

TG

CB

VIN

CIN

BOOST

27

–

+

–

+

OV

UV

CVCC

VOUT

M2

M1

L1

COUT

DB

ITHB

VOUT

0.6V

4.8V

VON

RSENSE

(OPTIONAL)*

SENSE+

SENSE–

23

24

SENSE+

SENSE–

BG

M2

*CONNECTION W/O

SENSE RESISTOR

SW

PGND

(0.5~2)

VREFIN

R3

0.25V

–

+

–

+

VREFOUT

0.6V

REF

VIN

10K

90K

10K

–

+

5

MARGIN1

10

MPGM

1.18V

R4

TRACK/SS

12K

FOLDBACK

DISABLED

AT START-UP*

RUN 30

MARGIN0

6

VFB

4

2

PLLIN

PLLFLTR

PLL-SYNC

13

12

VINSNS

15

17

18

28

Z0

Z1

Z2

16

ZVIN

+

5V

REG

1.4µA

CSS

21

26

R

INTVCC

FU CTIO AL DIAGRA

(UH Package)

VON (Pin 31/Pin 2): On-Time Voltage Input. Connecting

this pin to the output voltage makes the on-time propor-

tional to VOUT. The comparator input defaults to 0.6V when

the pin is grounded and defaults to 4.8V when the pin is

tied to INTVCC.

PGOOD (Pin 32/Pin 3): Power Good Output. Open drain

logic output that is pulled to ground when the output

voltage is not within ±10% of the regulation point, after the

internal 25µs power bad mask timer expires.

Exposed Pad (Pin 33) UH Package: Signal Ground. Must

be soldered to the PCB ground for electrical contact and

optimum thermal performance.

PI FU CTIO S (UH Package/G Package)

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