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US1075CP 데이터시트 PDF




UNISEM에서 제조한 전자 부품 US1075CP은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 US1075CP 자료 제공

부품번호 US1075CP 기능
기능 7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
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US1075CP 데이터시트, 핀배열, 회로
FEATURES
1V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-in Thermal Shutdown
APPLICATIONS
Low Voltage Processor Applications such as :
P54C,P55C,Cyrix M2,
POWER PC,AMD
GTL+ Termination
PENTIUM PRO, KLAMATH
Low Voltage Memory Termination Applications
Standard 3.3V Chip-Set and Logic Applications
US1075
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The US1075 product is a low dropout three terminal ad-
justable regulator with minimum of 7.5A output current
capability. This product is specifically designed to pro-
vide well regulated supply for low voltage IC applications
such as PentiumP54C,P55Cas well as GTL+
termination for Pentium Proand Klamathpro-
cessor applications . The US1075 is also well suited for
other processors such as Cyrix,AMD and Power
PCapplications. The US 1075 is guaranteed to have
<1.2V drop out at full load current making it ideal to
provide well regulated outputs such as 3.3V with input
supply voltage as low as 4.5V minimum.
TYPICAL APPLICATION
5V
C1
1500uF
Vin 3
1075app1-1.0
US1075 Vout 2
Adj 1
R1
121
R2
200
Typical Application of US1075 in a 5V to 3.3V regulator
3.3V
C2
2x 1500uF
Notes: Pentium P54C,P55C ,Klamath,Pentium Pro,VRE,are trade marks of Intel Corp.Cyrix M2 is trade mark of Cyrix Corp.
Power PC is trade mark of IBM Corp.
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 150
3 PIN PLASTIC
TO220 (T)
US1075CT
3 PIN PLASTIC
TO263 (M)
US1075CM
3 PIN PLASTIC
POWER FLEX (P)
US1075CP
Rev. 1.0
9/14/99
2-33




US1075CP pdf, 반도체, 판매, 대치품
US1075
Output Voltage Setting
The US1075 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
Where : VREF = 1.25V Typically
IADJ = 50 uA Typically
R1 & R2 as shown in figure 2
regulation is achieved when the bottom side of R2 is
connected to the load and the top side of R1 resistor is
connected directly to the case or the Vout pin of the
regulator and not to the load. In fact , if R1 is connected
to the load side, the effective resistance between the
regulator and the load is gained up by the factor of (1+R2/
R1) ,or the effective resistance will be ,Rp(eff)=Rp*(1+R2/
R1).It is important to note that for high current applica-
tions, this can represent a significant percentage of the
overall load regulation and one must keep the path from
the regulator to the load as short as possible to mini-
mize this effect.
Vin Vin
Vout
US1075
Vout
Adj Vref R1
IAdj = 50uA
R2
1075app2-1.0
Figure 2 - Typical application of the US1075
for programming the output voltage.
Vin
PARASITIC LINE
RESISTANCE
Rp
Vin Vout
US1075
Adj R1
R2
RL
1075app3-1.0
The US1075 keeps a constant 1.25V between the out-
put pin and the adjust pin. By placing a resistor R1 across
these two pins a constant current flows through R1, add-
ing to the Iadj current and into the R2 resistor producing
a voltage equal to the (1.25/R1)*R2 + Iadj*R2 which will
be added to the 1.25V to set the output voltage. This is
summarized in the above equation. Since the minimum
load current requirement of the US1075 is 10 mA , R1 is
typically selected to be 121resistor so that it auto-
matically satisfies the minimum current requirement.
Notice that since Iadj is typically in the range of 50uA it
only adds a small error to the output voltage and should
only be considered when a very precise output voltage
setting is required. For example, in a typical 3.3V appli-
cation where R1=121and R2=200the error due to
Iadj is only 0.3% of the nominal set point.
Load Regulation
Figure 3 - Schematic showing connection for best load
regulation
Stability
The US1075 requires the use of an output capacitor as
part of the frequency compensation in order to make the
regulator stable. Typical designs for microprocessor ap-
plications use standard electrolytic capacitors with a
typical ESR in the range of 50 to 100 mand an output
capacitance of 500 to 1000uF. Fortunately as the ca-
pacitance increases, the ESR decreases resulting in a
fixed RC time constant. The US1075 takes advantage of
this phenomena in making the overall regulator loop
stable.For most applications a minimum of 100uF alu-
minum electrolytic capacitor such as Sanyo MVGX se-
ries ,Panasonic FA series as well as the Nichicon PL
series insures both stability and good transient response.
Since the US1075 is only a 3 terminal device , it is not
possible to provide true remote sensing of the output
voltage at the load.Figure 3 shows that the best load
2-36
Rev. 1.0
9/14/99

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부품번호상세설명 및 기능제조사
US1075CM

7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

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US1075CP

7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

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