LTM8080 datasheet(12/32 Pages) AD

12 / 32 page

LTM4703

Rev. 0

For more information www.analog.com

PG (Pin F2): Output Power Good Indicator. The PG pin is

the open-drain output of an internal comparator. The PG

pin remains low until the VOSNS pin is within ±7.5% of the

final regulation voltage, and there are no fault conditions.

The PG is also pulled low when RUN is below 1V, INTVCC

has fallen too low, SVIN is too low, or during the thermal

shutdown. The PG pin is valid when SVIN is above 3V.

SW (Pin F6): Switching node of the LTM4703. This pin

is for test purposes only. Do not load the SW pin with

external circuitry.

CLKOUT (Pin F7): Output Clock Signal for PolyPhase®

Operation. The CLKOUT pin provides a 50% duty-cycle

square wave of the switching frequency. The phase of

CLKOUT with respect to the LTM4703 internal clock is

determined by the state of the PHMODE pin. The CLKOUT’s

peak-to-peak amplitude is INTVCC to GND. Float this pin if

the CLKOUT function is not used.

SYNC (Pin G6): This pin programs three different oper-

ating modes: 1) Pulse-skipping mode (PSM). Connect

this pin to GND for PSM to improve efficiency at light

loads. 2) Forced continuous mode (FCM). This mode

offers fast transient response and full-frequency oper-

ation over a wide load range. Connect this pin high to

INTVCC (~3.4V) or an external supply >3V for FCM. The

LTM4703 operates in this mode by default if this pin is

left floating. 3) Synchronization mode. Drive this pin with

a clock source synchronized to an external clock and put

the LTM4703 in FCM.

PIN FUNCTIONS

BLOCK DIAGRAM

VIN

VOUT

0.82µH

49.9k

COUT

RPGSET

CIN

1.21k

47nF

1µF

0.1µF

×2

CURRENT

MODE

CONTROLLER

VIN

SVIN

VOUT

PGSET

AGND

SET

GND

RUN

INTVCC

COMPa

COMPb

CLKOUT

SYNC

PHMODE

VOSNS

TSENSE+

TSENSE–

0.1µF

×2

4703 BD

3.4V

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