1/25
L6995
December 2002
FEATURE
■ CONST AN T ON TIME TOPO LOG Y ALLO WS
OPERATION WITH LOWER DUTY TH AN
PWM TOPOLOGY
■ VERY FAST LOAD TRANSIENTS
■ 5V V
cc
SUPPLY
■ 1.5V TO 28V INP UT VOLT AG E RANGE
■ 0.9V ±1% V
REF
■
MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V
■ SELECTABLE SINKING MODE
■ L O SSL ESS CURRENT LIMI T
■ REMO TE SENSING
■ OVP,UVP LATCHED PROTECTIONS
■ 600µA TYP QUIESCENT CURRENT
■ POWER GOOD AND OVP SIGNALS
■ PULSE SKIPPING AT L IGHT LOADS
APPLIC ATION S
■ I/O BUS FOR CPU CORE SUPPLY
■ NOTEBO OK COMPUTERS
■ NETWORKING DC-DC
■ DIS TRI BUTED POWER
DESCRIPTION
The device is a step-down controller specifically de-
signed to provide extremely high efficiency conver-
sion, with losses current sensing tecnique.
The "constant on-time" topology assures fast load
trans ient response. The embedded "voltage feed-for -
ward" provides nearly constant switching frequency
operation.
An integrator can be introduced in the control loop to
reduce the static output voltage error.
The available remote sensing improve the static and
dynamic regulation recovering the wires voltage
drop. Pulse skipping technique reduces power con-
sumption at light load. Drivers current capability al-
lows output current in excess of 20A.
TSSOP20
ORDERING NUMBERS: L6995D
L6995DTR
STEP DOWN CONTROLLER FOR HIGH DIFFERENTIA L
INPUT-OUTPUT CONVERSION
This is preliminary information on a new product now in development. Details are subject to change without notice.
MINIMUM COMPONENT COUNT APPLICATION
SS
C
C
BOOT
OUT
C
SHDN
0.9V
Vo
L6995
28V
Rin2 Rin1
CIN
RILIM
5V
VDR
INT
VFB
SS
OSC
BOOT
HGATE
PHASE
LGATE
PGND
GND
NOSKIP
ILIM
VSENSE
VREF
5V
VREF
C
L
BOOT
D
VCC
HS
LS
DS
