L6727 datasheet(1/34 Pages) STMICROELECTRONICS

Part #	L6727

Description	Single phase PWM controller

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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March 2010

Doc ID 12933 Rev 4

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34

L6727

Single phase PWM controller

Feature

■ Flexible power supply from 5 V to 12 V

■ Power conversion input as low as 1.5 V

■ 1 % output voltage accuracy

■ High-current integrated drivers

■ Adjustable output voltage

■ 0.8 V internal reference

■ Simple voltage mode control loop

■ Sensorless and programmable OCP across

Low-side RdsON

■ Oscillator internally fixed at 300 kHz

■ Internal Soft-start

■ LS-LESS to manage pre-bias start-up

■ Disable function

■ OV / UV protection

■ FB disconnection protection

■ SO-8 package

Applications

■ Subsystem power supply (MCH, IOCH, PCI...)

■ Memory and termination supply

■ CPU and DSP power supply

■ Distributed power supply

■ General DC / DC converters

Description

L6727 is a single-phase step-down controller with

integrated high-current drivers that provides

complete control logic, protections and reference

voltage to realize in an easy and simple way

general DC-DC converters by using a compact

SO-8 package.

Device flexibility allows managing conversions

with power input VIN as low as 1.5 V and device

supply voltage in the range of 5 V to 12 V.

L6727 provides simple control loop with voltage-

mode error-amplifier. The integrated 0.8 V

reference allows regulating output voltages with

±1 % accuracy over line and temperature

variations. Oscillator is internally fixed to 300 kHz.

L6727 provides programmable over current

protection as well as over and under voltage

protection. Current information is monitored

across the low-side MOSFET RdsON saving the

use of expensive and space-consuming sense

resistors while output voltage is monitored

through FB pin.

FB disconnection protection prevents excessive

and dangerous output voltages in case of floating

FB pin.

SO-8

Table 1.

Device summary

Order codes

Package

Packaging

L6727

SO-8

Tube

L6727TR

Tape and reel

www.st.com

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