L6727_10 Datasheet, PDF (1/34 Pages) STMicroelectronics – Single phase PWM controller

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 R_dsON
■ 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
SO-8
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 V_IN 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 R_dsON saving the
use of expensive and space-consuming sense
resistors while output voltage is monitored
through FB pin.
Table 1. Device summary
FB disconnection protection prevents excessive
and dangerous output voltages in case of floating
FB pin.
Order codes
Package
Packaging
L6727
L6727TR
SO-8
Tube
Tape and reel
March 2010
Doc ID 12933 Rev 4
1/34
www.st.com
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