LTC3413 datasheet(5/16 Pages) LINER

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LTC3413

sn3413 3413fs

FU CTIO AL DIAGRA

–

PVIN

ITH

VREF

SVIN

SGND

VFB

PGOOD

SVIN

PVIN

SLOPE

COMPENSATION

RECOVERY

SLOPE

COMPENSATION

PMOS CURRENT

COMPARATOR

NMOS CURRENT

COMPARATOR

OSCILLATOR

ERROR

AMPLIFIER

LOGIC

RUN

RUN/SS

PGND

3413 BD

12 PGND

1.1VREF

0.9VREF

PI FU CTIO S

SVIN (Pin 1): Signal Input Supply. Decouple this pin to

SGND with a capacitor. SVIN must be greater or equal to

PVIN, however, the difference between SVIN and PVIN must

be less than 0.5V.

PGOOD (Pin 2): Power Good Output. Open-drain logic

output that is pulled to ground when the output voltage is

not within

±10% of regulation point.

ITH (Pin 3): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.2V to

1.4V with 0.6V corresponding to the zero-sense voltage

(zero current).

VFB (Pin 4): Feedback Pin. Receives the feedback voltage

from the output.

RT (Pin 5): Oscillator Resistor Input. Connecting a resistor

to ground from this pin sets the switching frequency.

VREF (Pin 6): Reference Voltage Input. The positive input

of the internal error amplifier senses one-half of the

voltage at this pin through a resistor divider.

RUN/SS (Pin 7): Run Control and Soft-Start Input. Forcing

this pin below 0.5V shuts down the LTC3413. In shutdown

all functions are disabled drawing < 1

µA of supply current.

A capacitor to ground from this pin sets the ramp time to

full output current.

SGND (Pin 8): Signal Ground. All small-signal compo-

nents and compensation components should connect to

this ground, which in turn connects to PGND at one point.

PVIN (Pins 9, 16): Power Input Supply. Decouple this pin

to PGND with a capacitor.

SW (Pins 10, 11, 14, 15): Switch Node Connection to

Inductor. This pin connects to the drains of the internal

main and synchronous power MOSFET switches.

PGND (Pins 12, 13): Power Ground. Connect this pin

closely to the (–) terminal of CIN and COUT.

EXPOSED PAD (Pin 17): Should be connected to SGND.

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