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LTC1771

–

CSS

RUN/SS

VIN

VOUT

VIN

MODE

READY

SLEEP

READY

250k

22k

RSENSE

1.23V

µA

(BURST ENABLE)

10% CURRENT

SOFT-START

VIN

VOUT

CIN

COUT

SENSE

PGATE

3.5

µs

1771 BD

VFB

ITH

*OPTIONAL FOR FOLDBACK

CURRENT LIMITING

GND

–

ON TRIGGER

1.23V

REFERENCE

BLANKING

1-SHOT

STRETCH

FUNCTIONAL BLOCK DIAGRA

RUN/SS (Pin 1): The voltage level on this pin controls

shutdown/run mode (ground = shutdown, open/high =

run). Connecting an external capacitor to this pin provides

soft-start.

ITH (Pin 2): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is 0V to 3V.

VFB (Pin 3): Feedback of Output Voltage for Comparison

to Internal 1.23V Reference. An external resistive divider

across the output is returned to this pin.

GND (Pin 4): Ground Pin.

PGATE (Pin 5): High Current Gate Driver for External

P-Channel MOSFET Switch. Voltage swing is from ground

to VIN.

VIN (Pin 6): Main Input Voltage Supply Pin.

SENSE (Pin 7): Current Sense Input for Monitoring Switch

Current. Maximum switch current and Burst Mode

threshold is programmed with an external resistor be-

tween SENSE and VIN.

MODE (Pin 8): Burst Mode Enable/Disable Pin. Connect-

ing this pin to VIN (or above 2V) enables Burst Mode

operation, while connecting this pin to ground disables

Burst Mode operation. Do not leave floating.

PI FU CTIO S

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