L6728D Datasheet, PDF (1/33 Pages) STMicroelectronics – Single-phase PWM controller with Power Good

L6728D
Single-phase PWM controller with Power Good
Features
■ Flexible power supply from 5 V to 12 V
■ Power conversion input as low as 1.5 V
■ 0.8 V internal reference
■ 0.8% output voltage accuracy
■ High-current integrated drivers
■ Power Good output
■ Sensorless and programmable OCP across
low-side R_DS(on)
■ OV / UV protection
■ VSEN disconnection protection
■ Oscillator internally fixed at 300 kHz
■ LSLess to manage pre-bias startup
■ Adjustable output voltage
■ Disable function
■ Internal soft-start
■ DFN10 package
Applications
■ Memory and termination supply
■ Subsystem power supply (MCH, IOCH, PCI,
etc.)
■ CPU and DSP power supply
■ Distributed power supply
■ General DC-DC converters
Table 1. Device summary
DFN10
Description
L6728D is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic and protection to simplify
the design of general DC-DC converters by using
a compact DFN10 package.
Device flexibility allows the management of
conversions with power input (V_IN) as low as
1.5 V, and device supply voltage ranging from 5 V
to 12 V.
The L6728D provides a simple control loop with
voltage mode EA. The integrated 0.8 V reference
allows output voltages regulation with ±0.8%
accuracy over line and temperature variations.
The oscillator is internally fixed to 300 kHz.
The L6728D provides programmable dual level
overcurrent protection, as well as overvoltage and
undervoltage protection. Current information is
monitored across the low-side MOSFET R_DS(on),
eliminating the need for expensive and space-
consuming sense resistors.
A PGOOD output easily provides real-time
information on output voltage status, through the
VSEN dedicated output monitor.
Order codes
Package
Packaging
L6728D
L6728DTR
DFN10
Tube
Tape and reel
February 2010
Doc ID 16498 Rev 1
1/33
www.st.com
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