LT1776 データシートの表示（PDF） - Linear Technology

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LT1776

Wide Input Range, High Efficiency, Step-Down Switching Regulator

Linear Technology 

LT1776

PIN FUNCTIONS

10% and 90% duty cycle. The sync function is internally

disabled if the FB pin voltage is low enough to cause

oscillator slowdown. If unused, this pin should be grounded.

FB (Pin 7): This is the inverting input to the feedback

amplifier. The noninverting input of this amplifier is inter-

nally tied to the 1.24V reference. This pin also slows down

the frequency of the internal oscillator when its voltage is

abnormally low, e.g., 2/3 of normal or less. This feature

helps maintain proper short-circuit protection.

VC (Pin 8): This is the control voltage pin which is the

output of the feedback amplifier and the input of the

current comparator. Frequency compensation of the over-

all loop is effected by placing a capacitor, (or in most cases

a series RC combination) between this node and ground.

BLOCK DIAGRA

VCC 2

SHDN 1

BIAS

VBG

VB

SYNC 6

OSC

LOGIC

GND 4

VC 8

FB 7

VBG

BOOST

COMP

FB

VTH

AMP

gm

5 VIN

R1

RSENSE

SWDR

SWDR

SWON

BOOST

SWOFF

I

COMP

SWON

I

Q3

Q4

Q2

Q1

D1

I

I

BOOST

I

SWOFF

Q5

3 VSW

1776 BD

6

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