US1175
7.5A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
FEATURES
0.5V Dropout at 7.5A (Equivalent of 67mΩ)
Ω)
Fast Transient Response
1%
Voltage Reference Initial Accuracy
Built-in Thermal Shutdown
DESCRIPTION
The US1175 product is a
7.5A 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 very low dropout such as
2.8V from 3.3V ATX power supplies where the same
efficiency as the switcher can be achieved without
the cost and complexity associated with switching
regulators.
One such application is the new graphic
chip sets that requires 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
US1175
Vout
Adj
Vsense
2.7V
C3
R2
2
1
1175app1-1.0
5V
C2
Typical application of US1175 .
PACKAGE ORDER INFORMATION
Tj (
°
C)
0 TO 125
5 PIN PLASTIC
5 PIN PLASTIC
TO263 (M)
POWER FLEX (P)
US1175CM
US1175CP
8 PIN PLASTIC
SOIC (S)
US1175CS
Rev. 1.2
11/29/99
2-1
UNISEM [ UNISEM ]
