L6996 Datasheet, PDF (1/26 Pages) STMicroelectronics – DINAMICALLY PROGRAMMABLE SYNCHRONOUS STEP DOWN CONTROLLER FOR MOBILE CPUs

L6996
DINAMICALLY PROGRAMMABLE SYNCHRONOUS
STEP DOWN CONTROLLER FOR MOBILE CPUs
s 5 BIT DAC WITH AVAILABLE EXTERNAL
OUTPUT VOLTAGE.
s 0.6 TO 1.750V, DYNAMICALLY ADJUSTABLE
OUTPUT VOLTAGE RANGE.
s ±1% OUTPUT ACCURACY OVER LINE AND LOAD.
s ACTIVE DROOP.
s CONSTANT ON TIME TOPOLOGY ALLOWS
LOW DUTY CYCLE AND FAST LOAD
TRANSIENT.
s 90% EFFICIENCY FROM 12V TO 1.35V/8A.
s 1.750V TO 28V BATTERY INPUT RANGE.
s OPERATING FREQUENCY UP TO 1MHZ.
s INTEGRATED HIGH CURRENT DRIVERS.
s LATCHED OVP AND UVP PROTECTIONS.
OCP PROTECTION.
s 350µA TYP. QUIESCENT CURRENT.
s 7µA TYP. SHUTDOWN SUPPLY CURRENT.
s PGOOD AND OVP SIGNALS.
s ZERO-CURRENT DETECTION AND PULSE-
FREQUENCY MODE.
APPLICATIONS
s ADVANCED MOBILE CPUs SUPPLY WITH
DYNAMIC TRANSITIONS.
s NOTEBOOK/LAPTOP, CONCEPT PC CPUs
SUPPLY.
s DC/DC FROM BATTERY SUPPLY EQUIPMENTS.
APPLICATION DIAGRAM
5V
TSSOP24
ORDERING NUMBERS: L6996D (TSSOP24)
L6996DTR (Tape & Reel)
DESCRIPTION
The device is dc-dc controller specifically designed to
provide extremely high efficiency conversion for mo-
bile advanced microprocessors.
The "constant on-time" topology assures fast load
transient response. The embedded "voltage feedfor-
ward" provides nearly constant switching frequency
operation.
A precise 5-bit DAC allows select output voltage from
0.6V to 1V with 25mV steps and from 1V to 1.75V
with 50mV steps.
L6996 is capable of supporting CPUs VID combina-
tion changing during normal operation.
The active droop allows adjust both the output load-
line slope and the zero-load output voltage.
25V
July 2002
OSC
BOOT
HGATE
PGOOD
PHASE
OVP
LGATE
L6996
ILIM
PGND
GND
CS+
CS-
SS
C_SS
VFB-
VFB+
HS
LS
DS
5V
L
R_{SENSE VOUT}
1.25V
SHDN
VID4:0
VPROG
C_VPROG
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