LTC1701 datasheet(3/12 Pages) LINER

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LTC1701

SW (Pin 1): The Switch Node Connection to the Inductor.

This pin swings from VIN to a Schottky diode (external)

voltage drop below ground. The cathode of the Schottky

diode must be closely connected to this pin.

GND (Pin 2): Ground Pin. Connect to the (–) terminal of

COUT, the Schottky diode and (–) terminal of CIN.

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

external resistive divider across the output. Nominal volt-

age for this pin is 1.25V.

ITH/RUN (Pin 4): Combination of Error Amplifier Compen-

sation Point and Run Control Input. The current compara-

tor threshold increases with this control voltage. Nominal

voltage range for this pin is 1.25V to 2.25V. Forcing this

pin below 0.8V causes the device to be shut down. In

shutdown all functions are disabled.

VIN (Pin 5): Main Supply Pin and the (+) Input to the

Current Comparator. Must be closely decoupled to ground.

PI FU CTIO S

BLOCK DIAGRA

–

1.25V

BANDGAP

REFERENCE

ITH/REF

CLAMP

SHDN

µA

VREF

1.4V

1.5V

VREF

(1.25V)

–

OVER

VOLTAGE

COMP

–

ITH

COMP

–

ERROR

AMP

(1.25V TO 2.25V)

–

CURRENT

COMP

VREF

–

CURRENT

SENSE

AMP

GND

1701 BD

VIN

OFF-TIMER

AND GATE

CONTROL LOGIC

GATE

DRIVER

VFB

ITH/RUN

PULSE

STRETCHER

VFB < 0.6V

VIN

Pin Limit Table

NOMINAL (V)

ABSOLUTE MAX (V)

NAME

DESCRIPTION

MIN

TYP

MAX

MIN

MAX

Switch Node

– 0.3

VIN

– 0.3

VIN + 0.3

GND

Ground Pin

3VFB

Output Feedback Pin

1.25

1.35

– 0.3

4ITH/RUN

Error Amplifier Compensation and RUN Pin

2.25

– 0.3

5VIN

Main Power Supply

2.5

5.5

– 0.3

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