L6995 Datasheet, PDF (1/25 Pages) STMicroelectronics – STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION

L6995
STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL
INPUT-OUTPUT CONVERSION
FEATURE
s CONSTANT ON TIME TOPOLOGY ALLOWS
OPERATION WITH LOWER DUTY THAN
PWM TOPOLOGY
s VERY FAST LOAD TRANSIENTS
s 5V V_cc SUPPLY
s 1.5V TO 28V INPUT VOLTAGE RANGE
s 0.9V ±1% V_REF
s MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V
s SELECTABLE SINKING MODE
s LOSSLESS CURRENT LIMIT
s REMOTE SENSING
s OVP,UVP LATCHED PROTECTIONS
s 600µA TYP QUIESCENT CURRENT
s POWER GOOD AND OVP SIGNALS
s PULSE SKIPPING AT LIGHT LOADS
APPLICATIONS
s I/O BUS FOR CPU CORE SUPPLY
s NOTEBOOK COMPUTERS
s NETWORKING DC-DC
s DISTRIBUTED POWER
TSSOP20
ORDERING NUMBERS: L6995D
L6995DTR
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
transient 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.
MINIMUM COMPONENT COUNT APPLICATION
28V
Rin2
Rin1
5V
OSC
BOOT
HGATE
HS
CIN
D
C
BOOT
BOOT
5V
Vo
PHASE
RILIM
LGATE
ILIM
PGND
L6995 ^GND
NOSKIP
VSENSE
LS
DS
L
C_OUT
0.9V
SS
C_SS
INT
VFB
VREF
C_VREF
December 2002
This is preliminary information on a new product now in development. Details are subject to change without notice.
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