LTC1772B_1 datasheet(5/16 Pages) LINER

Part #	LTC1772B

Description	Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC1772B

5

1772bfa

PIN FUNCTIONS

FUNCTIONAL DIAGRAM

ITH/RUN (Pin 1): This pin performs two functions. It

serves as the error ampliﬁer compensation point as well

as the run control input. Nominal voltage range for this

pin is 0.85V to 1.9V. Forcing this pin below 0.35V causes

the device to be shut down. In shutdown all functions are

disabled and the PGATE pin is held high.

GND (Pin 2): Ground Pin.

VFB (Pin 3): Receives the feedback voltage from an external

resistive divider across the output.

SENSE– (Pin 4):

The Negative Input to the Current Com-

parator.

VIN (Pin 5): Supply Pin. Must be closely decoupled to

GND Pin 2.

PGATE (Pin 6): Gate Drive for the External P-channel

MOSFET. This pin swings from 0V to VIN.

SWITCHING

LOGIC AND

BLANKING

CIRCUIT

–

+

0.5μA

0.3V

OVP

SHORT-CIRCUIT

DETECT

SHDN

1.2V

UV

1772FD

VREF

+

60mV

VREF

0.8V

VIN

RS1

VOLTAGE

REFERENCE

SLOPE

COMP

ICMP

R

S

Q

FREQ

FOLDBACK

OSC

SENSE–

VIN

5

2

4

–

+

4

EAMP

VFB

–

+

3

PGATE

VIN

6

ITH/RUN

VIN

0.35V

VREF

0.8V

1

–

+

SHDN

CMP

GND

–

+

UNDERVOLTAGE

LOCKOUT

15mV

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LTC1772B Datasheet(PDF) 5 Page - Linear Technology

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