L6722 Datasheet, PDF (1/34 Pages) STMicroelectronics – 3 Phase controller for DC/DC converters

L6722
3 Phase controller for DC/DC converters
Features
■ 2A integrated gate drivers
■ 0.8V reference
■ 1% output voltage accuracy
■ Adjustable reference offset
■ Precise current sharing and OCP across LS
MOSFETS
■ Constant over current protection
■ Feedback disconnection
■ LSLESS allows managing pre-bias startup
■ Preliminary of protection
■ Oscillator internally fixed at 100kHz, externally
adjustable
■ Power good
■ Integrated remote sense buffer
■ VFQFPN36 package with exposed pad
Applications
■ Memory supply for server and workstation MBs
■ High density DC / DC converters
■ High current pol
VFQFPN36
Description
L6722 implements a three-phase step-down
controller with 120º phase-shift between each
phase with integrated high-current drivers in a
compact VFQFPN36 package with exposed pad.
L6722 manages output voltages down to 0.8V
with ±1% output voltage accuracy over line and
temperature variations. Additional programmable
offset can be added to the reference voltage with
a single external resistor in order to perform
margining tests.
The controller assures fast protection against load
over current and over / under voltage. In case of
over-current the system works in Constant
Current mode until UVP. Preliminary OVP allows
full load protection in case of startup with failed
HS. Feedback-disconnection protection prevents
from damaging the load in case of misconnections
in the remote sense. Pre-bias start-up is also
managed thanks to LSLESS.
Combined use of DCR and RdsON current
sensing assures precision in voltage positioning
(by reading droop current across inductors DCR)
and safe current sharing and OCP per each
phase (by reading the current across LS RdsON).
Droop function can be anyway disabled to
perform precise and load-insensitive regulation.
Order codes
Part number
L6722
L6722TR
Package
VFQFPN36
VFQFPN36
Packing
Tube
Tape & Reel
May 2006
Rev 1
1/34
www.st.com
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