LTC3772EDDB datasheet(6/20 Pages) LINER

Part #	LTC3772EDDB

Description	Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3772

3772f

PI FU CTIO S

GND (Pin 1/Pin 4): Ground Pin.

VFB (Pin 2/Pin 3): Receives the feedback voltage from an

external resistor divider across the output.

ITH/RUN (Pin 3/Pin 2): 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

0.7V to 1.9V. Forcing this pin below 0.6V causes the

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

disabled and the PGATE pin is held high.

IPRG (Pin 4/Pin 1): Current Sense Limit Pin. Three-state

pin selects maximum peak sense voltage threshold. The

pin selects the maximum voltage drop across the external

P-channel MOSFET. Tie to VIN, GND or float to select

245mV, 105mV or 175mV respectively.

NC (Pin 5/Pin 8): No Connection Required.

SW (Pin 6/Pin 7): Switch Node Connection to Inductor

and Current Sense Input Pin. Normally, the external

P-channel MOSFET’s drain is connected to this pin.

VIN (Pin 7/Pin 6): Supply and Current Sense Input Pin.

This pin must be closely decoupled to GND (Pin 4).

Normally the external P-channel MOSFET’s source is

connected to this pin.

PGATE (Pin 8/Pin 5): Gate Drive for the External P-Channel

MOSFET. This pin swings from 0V to VIN.

Exposed Pad (Pin 9, DDB Only): The Exposed Pad is

ground and must be soldered to the PCB for electrical

connection and optimum thermal performance.

(DDB/TS8)

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