LTC3404 datasheet(6/16 Pages) LINER

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LTC3404

–

OVDET

IRCMP

–

ICOMP

RUN

PLL LPF

VCO

Y = “0” ONLY WHEN X IS A CONSTANT “1”

BURST

DEFEAT

SLOPE

COMP

OSC

SYNC/MODE

0.6V

FREQ

SHIFT

VREF

0.8V

0.85V

gm = 0.5m

0.8V REF

SHUTDOWN

0.55V

0.8V

SLEEP

VIN

ITH

SLEEP

VFB

BURST

VIN

RS LATCH

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

ANTI-

SHOOT-

THRU

Ω

GND

3404 BD

P-CH

N-CH

FU CTIO AL DIAGRA

RUN (Pin 1): Run Control Input. Forcing this pin below

0.4V shuts down the LTC3404. In shutdown all functions

are disabled drawing < 1

µA supply current. Forcing this

pin above 1.2V enables the LTC3404. Do not leave RUN

floating.

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

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.5V

to 1.9V.

VFB (Pin 3): Feedback Pin. Receives the feedback voltage

from an external resistive divider across the output.

GND (Pin 4): Ground Pin.

SW (Pin 5): Switch Node Connection to Inductor. This pin

connects to the drains of the internal main and synchro-

nous power MOSFET switches.

VIN (Pin 6): Main Supply Pin. Must be closely decoupled

to GND, Pin 4.

SYNC/MODE (Pin 7): External Clock Synchronization and

Mode Select Input. To synchronize with an external clock,

apply a clock with a frequency between 1MHz and 1.7MHz.

To select Burst Mode operation, tie to VIN. Grounding this

pin selects pulse skipping mode. Do not leave this pin

floating.

PLL LPF (Pin 8): Output of the Phase Detector and Control

Input of Oscillator. Connect a series RC lowpass network

from this pin to ground if externally synchronized. If

unused, this pin may be left open.

PI FU CTIO S

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