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LTC3703

3703f

FU CTIO AL DIAGRA

UVSD OTSD

CHIP

3.2V

µA

RUN/SS

BANDGAP

SYNC

DETECT

OVER

TEMP

VCC

UVLO

OSC

% DC

LIMIT

DRIVE

LOGIC

–

EXT SYNC

FORCED CONTINUOUS

–

0.8V

MODE/SYNC

COMP

VIN

VCC

(<15V)

INV

PWM

MIN

MAX

0.76V

0.84V

OVERCURRENT

µA

50mV

IMAX

RMAX

BOOST

DRVCC

BGRTN

INV

8 GND

GN16

OT SD

0.8V

REFERENCE

INTERNAL

3.2V VCC

UV SD

FSET

3703 FD

REVERSE

CURRENT

RSET

CSS

VCC

CVCC

VCC

VIN

COUT

VOUT

INV

OPERATIO

The LTC3703 is a constant frequency, voltage mode

controller for DC/DC step-down converters. It is designed

to be used in a synchronous switching architecture with

two external N-channel MOSFETs. Its high operating volt-

age capability allows it to directly step down input voltages

up to 100V without the need for a step-down transformer.

For circuit operation, please refer to the Functional Dia-

gram of the IC and Figure 1. The LTC3703 uses voltage

mode control in which the duty ratio is controlled directly

by the error amplifier output and thus requires no current

sense resistor. The VFB pin receives the output voltage

feedback and is compared to the internal 0.8V reference by

the error amplifier, which outputs an error signal at the

COMP pin. When the load current increases, it causes a

drop in the feedback voltage relative to the reference. The

COMP voltage then rises, increasing the duty ratio until the

(Refer to Functional Diagram)

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