Data Brief

For further information contact your local STMicroelectronics sales office.

March 2008

Rev 1

1/3

3

L6733

Advanced modular synchronous PWM controller

Features

programmable supply voltage

with selectable UVLO threshold

variations (0 °C to 125 °C)

Applications

Description

L6733 is a single-phase PWM controller designed

to drive N-channel power MOSFETs in a

synhronous rectified buck topology also providing

DCM operations to optimize efficiency in light-

load conditions.

The device is specifically designed to implement

redundant and parallelable DC-DC converters.

Current-sharing bus control and OR-Ing fet

driving circuitry are embedded featuring proper

protection management. Synchronization is also

available helping further in reducing input

capacitance in paralleled converters.

Programmable margin mode control through

single pin allow saving external logic.

L6733 provides an integrated 0.6 V reference

allowing regulating output voltages with ±0.8 %

accuracy over line and temperature variations

(0 °C to 125 °C) recovering connector and PCB

losses through the remote amplifier provided.

Programmable dual level over current protection

as well as over and under voltage protection are

provided. Current information is monitored across

the main inductor DCR saving the use of

expensive and space-consuming sense resistors.

Oscillator is internally fixed to 200 kHz and

adjustable up to 1 MHz.

VFQFPN32 5x5 mm

Table 1.

Device summary

Order codes

Package

Packing

L6733

VFQFPN32

Tube

L6733TR

Tape and reel

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