US1150 ADJUSTABLE REGULATOR Datasheet

US1150 Datasheet, PDF, Equivalent


Part Number

US1150

Description

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

Manufacture

UNISEM

Total Page 5 Pages
Datasheet
Download US1150 Datasheet


US1150
FEATURES
0.7V Dropout at 4A
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-in Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel I740 chip set.
US1150
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
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.
TYPICAL APPLICATION
3.3V
C1
Vin 5
US1150
Vctrl 4
Vout 3
Adj 2
Vsense 1
1150app1-1.0
5V
C2
2.7V
R1
C3
R2
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 8 PIN PLASTIC
TO263 (M) POWER FLEX (P) SOIC (S)
US1150CM
US1150CP
US1150CS
Rev. 1.2
10/28/99
2-1

US1150
US1150
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ........................................................... 7V
Control Input Voltage (Vctrl) .................................................. 14V
Power Dissipation............................................. Internally Limited
Storage Temperature Range ................................... -65°C TO 150°C
Operating Junction Temperature Range ..................... 0°C TO 150°C
PACKAGE INFORMATION
8 PIN PLASTIC SOIC ( S )
5 PIN PLASTIC TO263 ( M )
TOP VIEW
Vctrl 1
8 Vout
Vin 2
7 Vout
Adj 3
6 Vout
Vsense 4
5 Vout
FRONT VIEW
5
4
3
2
1
Vin
Vctrl
Vout
Adj
Vsense
θJA=55°C/W for 1" Sq pad area θJA=35°C/W for 0.5" square pad
5 PIN PLASTIC POWER FLEX (P)
FRONT VIEW
5
4
3
2
1
Vin
Vctrl
Vout
Adj
Vsense
θJA=35°C/W for 0.5" square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=1uF,Cout=10uF, and Tj=0 to 125°C.Typical
values refer to Tj=25°C. Vout=Vsense.
PARAMETER
Reference Voltage
Line Regulation
Load Regulation (note 1)
Dropout Voltage (note 2)
(Vctrl - Vout)
SYM
Vref
TEST CONDITION
MIN
Vctrl=2.75V,Vin=2V,Io=10mA
1.243
Tj=25,Vadj=0V
Vctrl=2.7to12V,Vin=2.05V to 5.5V, 1.237
Io=10mA to 4A,Vadj=0V
Vctrl=2.5Vto7V,Vin=1.75Vto5.5V
,Io=10mA ,Vadj=0V
Vctrl=2.75V,Vin=2.1V,Io=10mA
to 4A,Vadj=0V
Vadj=0V for all conditions below.
Vin=2.05V,Io=1.5A
Vin=2.05V,Io=3A
Vin=2.05V,Io=4A
TYP
1.250
1.250
1.10
MAX
1.257
1.263
3
5
1.15
1.18
1.25
UNITS
V
mV
mV
V
Dropout Voltage (note 2)
(Vin - Vout)
Vadj=0V for all conditions below.
Vctrl=2.75V,Io=1.5A
Vctrl=2.75V,Io=3A
Vctrl=2.75V,Io=4A
0.26 0.38
0.50 0.60
0.70 0.85
V
Current Limit
Minimum Load Current (note 3)
Thermal Regulation
Ripple Rejection
Vctrl=2.75V,Vin=2.05V,
dVo=100mV Vadj=0V
Vctrl=5V,Vin=3.3V,Vadj=0V,
30 mS Pulse
Vctrl=5V,Vin=5V,Io=4A,Vadj=0V
Tj=25,Vripple=1Vpp at 120Hz
4.2 A
5 10 mA
0.01 0.02 %/W
60 70
dB
2-2
Rev. 1.2
10/28/99


Features US1150 4A ULTRA LOW DROPOUT POSITIVE ADJ USTABLE REGULATOR PRELIMINARY DATASHEET FEATURES 0.7V Dropout at 4A Fast Tran sient Response 1% Voltage Reference Ini tial Accuracy Built-in Thermal Shutdown DESCRIPTION The US1150 product is a 4 A regulator with extremely low dropout voltage using a proprietary Bipolar pro cess that achieves comparable equivalen t on resistance to that of discrete MOS FETs. This product is specifically desi gned to provide well regulated supply f or 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 compl exity associated with switching regulat ors. One such application is the new gr aphic chip sets that require anywhere f rom 2.4V to 2.7V supply such as the Int el I740 chip set. APPLICATIONS 3.3V to 2.7V Intel I740 chip set. TYPICAL APP LICATION 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 3.3.
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