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US1150 데이터시트 PDF




UNISEM에서 제조한 전자 부품 US1150은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 US1150 기능
기능 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
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US1150 데이터시트, 핀배열, 회로
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 pdf, 반도체, 판매, 대치품
US1150
BLOCK DIAGRAM
Vin
Vctrl
+
CURRENT
LIMIT
1.25V +
THERMAL
SHUTDOWN
1150blk1-1.1
Figure 1 - Simplified block diagram of the US1150
Vout
Vsense
Adj
APPLICATION INFORMATION
Introduction
The US1150 adjustable regulator is a 5 terminal device
designed specificaly to provide extremely low dropout
voltages comparable to the PNP type without the disad-
vantage of the extra power dissipation due to the base
current associated with PNP regulators.This is done by
bringinging out the control pin of the regulator that pro-
vides the base current to the power NPN and connect-
ing it to a voltage that is grater than the voltage present
at the Vin pin.This flexebility makes the US1150 ideal
for applications where dual inputs are available such as
a computer motherboard with an ATX style power sup-
ply that provides 5V and 3.3V to the board.One such
application is the new graphic chip sets that require any-
where from 2.4V to 2.7V supply such as the Intel I740
chip set. The US1150 can easily be programmed with
the addition of two external resistors to any voltages
within the range of 1.25 to 5.5 V. Another major require-
ment of these graphic chips such as the Intel I740 is the
need to switch the load current from zero to several amps
in tens of nanoseconds at the processor pins ,which
translates to an approximately 300 to 500 nS of current
step at the regulator . In addition, the output voltage tol-
erances are also extremely tight and they include the
transient response as part of the specification.
The US1150 is specifically designed to meet the fast
current transient needs as well as providing an accurate
initial voltage , reducing the overall system cost with the
need for fewer number of output capacitors.Another fea-
ture of the device is its true remote sensing capability
which allows accurate voltage setting at the load rather
than at the device.
Output Voltage Setting
The US1150 can be programmed to any voltages in the
range of 1.25V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
VOUT
=
VREF1+
R2
R1 
+ IADJ
× R2
Wehre : VREF=1.25V Typically
IADJ=50 uA Typically
R1 & R2 as shown in figure 2
Vin
Vctrl
Vin Vout
US1150
Vctrl
Vsense
Adj
Vref
R1
Vout
IAdj = 50uA R2
1150app2-1.1
Figure 2 - Typical application of the US1150 for
programming the output voltage.
2-4
Rev. 1.2
10/28/99

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