US1150
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
FEATURES
0.7V Dropout at 4A
Fast Transient Response
1%
Voltage Reference Initial Accuracy
Built-in Thermal Shutdown
DESCRIPTION
The US1150 product is a
4A regulator with extremely
low dropout voltage using a proprietary Bipolar pro-
cess that achieves comparable equivalent on re-
sistance to that of discrete MOSFETs.
This product is
specifically designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V ATX power supplies where high efficiency of
a switcher can be achieved without the cost and
complexity associated with switching regulators.
One such application is the new graphic chip sets that
require anywhere from 2.4V to 2.7V supply such as the
Intel I740 chip set.
APPLICATIONS
3.3V to 2.7V Intel I740 chip set.
TYPICAL APPLICATION
3.3V
C1
Vin
Vctrl
5
4
3
R1
US1150
Vout
Adj
Vsense
2.7V
C3
R2
2
1
1150app1-1.0
5V
C2
Typical application of US1150 in a 3.3V to 2.7V for I740 chip.
PACKAGE ORDER INFORMATION
Tj (
°
C)
0 TO 125
5 PIN PLASTIC
5 PIN PLASTIC
TO263 (M)
POWER FLEX (P)
US1150CM
US1150CP
8 PIN PLASTIC
SOIC (S)
US1150CS
Rev. 1.2
10/28/99
2-1
UNISEM [ UNISEM ]
