UNISEM US1075CT, US1075CP, US1075CM Datasheet
US1075
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
FEATURESFEATURES
1V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-in Thermal Shutdown
APPLICATIONSAPPLICATIONS
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
TYPICAL APPLICATIONTYPICAL APPLICATION
DESCRIPTIONDESCRIPTION
The US1075 product is a low dropout three terminal adjustable regulator with minimum of 7.5A output current
capability. This product is specifically designed to provide well regulated supply for low voltage IC applications
such as Pentium P54C,P55C as well as GTL+
termination for Pentium Pro and Klamath pro-
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.
5V
C1
1500uF
Vin
3
Vout
Adj
2
R1
121
1
R2
200
US1075
1075app1-1.0
Typical Application of US1075 in a 5V to 3.3V regulator
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.
3.3V
C2
2x 1500uF
PACKAGE ORDER INFORMATIONPACKAGE ORDER INFORMATION
Tj (°C) 3 PIN PLASTIC 3 PIN PLASTIC 3 PIN PLASTIC
TO220 (T) TO263 (M) POWER FLEX (P)
0 TO 150 US1075CT US1075CM US1075CP
Rev. 1.0
9/14/99
2-33
US1075
ABSOLUTE MAXIMUM RATINGSABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .................................................................. 7V
Power Dissipation ............................................ Internally Limited
Storage Temperature Range .............................. -65°C TO 150°C
Operating Junction Temperature Range .................. 0°C TO 150°C
PACKAGE INFORMATIONPACKAGE INFORMATION
3 PIN PLASTIC TO220 ( T ) 3 PIN PLASTIC TO263 ( M ) 3 PIN PLASTIC POWER FLEX ( P )
Tab is
Vout
FRONT VIEW
3
2
1
Vin
Vout
Adj
Tab is
Vout
FRONT VIEW
3
Vin
2
Vout
1
Adj
θJT=2.7°C/W θJA=60°C/W θJA=35°C/W for 1" Square pad θJA=35°C/W for 1" Square pad
ELECTRICAL SPECIFICATIONSELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=1uF,Cout=10uF,and Tj=0 to 150°C.Typical
values refer to Tj=25°C.
Tab is
Vout
FRONT VIEW
3
Vin
2
Vout
1
Adj
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF Io=10mA,Tj=25°C,(Vin-Vo)=1.5V 1.238 1.250 1.262 V
Io=10mA, (Vin-Vo)=1.5V 1.225 1.250 1.275
Line Regulation Io=10mA,1.3V<(Vin-Vo)<7V 0.2 %
Load Regulation (note 1) Vin=3.3V,Vadj=0,10mA<Io<7.5A 0.4 %
Dropout Voltage Io=7.5A 1.0 1.2 V
(note 2) ∆VO Io=4A 0.92 1.1
Current Limit Vin=3.3V,dVo=100mV 7.6 9 A
Minimum Load Current Vin=3.3V,Vadj=0V 5 10 mA
(note 3)
Thermal Regulation 30 mS PULSE,Vin-Vo=3V,Io=7.5A 0.02 %/W
Ripple Rejection f=120HZ ,Co=25uF Tan
Io=7.5A,Vin-Vo=3V 60 70 dB
Adjust Pin Current IADJ Io=10mA,Vin-Vo=1.5V,Tj=25
Io=10mA,Vin-Vo=1.5V 55 120 uA
Adjust Pin Current Change Io=10mA,Vin-Vo=1.5V,Tj=25 0.2 5 uA
Temperature Stability Vin=3.3V,Vadj=0V,Io=10mA 0.5 %
Long Term Stability Tj=125°C,1000 Hrs 0.3 %
RMS Output Noise Tj=25°C 10hz<f<10khz 0.003 %Vo
Note 1 : Low duty cycle pulse testing with Kelvin connections are required in order to maintain accurate data.
Note 2 : Drop-out voltage is defined as the minimum
differential voltage between Vin and Vout required to maintain regulation at Vout. It is measured when the output
Note 3 : Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically maintains this current.
voltage drops 1% below its nominal value.
2-34
Rev. 1.0
9/14/99
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