L6738 Datasheet, PDF (1/32 Pages) STMicroelectronics – Single-phase PWM controller with light-load efficiency optimization

L6738
Single-phase PWM controller
with light-load efficiency optimization
Features
■ Flexible power supply from 5 V to 12 V bus
■ Power conversion input as low as 1.5 V
■ Light-load efficiency optimization
■ Embedded bootstrap diode
■ VIN detector
■ 0.8 V internal reference
■ 0.5 % output voltage accuracy
■ Remote GND recovery
■ High-current integrated drivers
■ Sensorless and programmable precise-OC
sense across Inductor DCR
■ OV protection
■ Programmable oscillator up to 600 kHz
■ LS-less to manage pre-bias startup
■ Adjustable output voltage
■ Disable function
■ Internal soft-start
■ VFQFPN 16 3x3 mm package
Applications
■ Memory and termination supply
■ Subsystem power supply (MCH, IOCH, PCI)
■ CPU and DSP power supply
■ Distributed power supply
■ General DC-DC converter
Description
The L6738 is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic and protection to realize a
DC-DC converter.
The device flexibility allows to manage
conversions with power input V_IN as low as 1.5 V
VFQFPN16
and the device supply voltage ranging from 5 V to
12 V bus.
The L6738 features a proprietary algorithm that
allows Light-Load efficiency optimization,
boosting efficiency without compromising the
output voltage ripple.
The integrated 0.8 V reference allows generation
of output voltages with ±0.5 % accuracy over line
and temperature variations.
The oscillator is programmable up to 600 kHz.
The L6738 provides a programmable dual level
overcurrent protection and overvoltage protection.
The current information is monitored across the
inductor DCR.
The L6738 is available in a VFQFPN 16 3x3 mm
package.
Table 1. Device summary
Order code
Package
L6738
L6738TR
VFQFPN16
VFQFPN16
Packing
Tube
Tape and reel
November 2010
Doc ID 18133 Rev 1
1/32
www.st.com
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