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Details, datasheet, quote on part number:US1075CP
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| Part: | US1075CP |
| Category: | Power Management => Regulators => Linear Regulators => Positive |
| Description: | 7.5a Low Dropout Positive Adjustable Regulator |
| Company: | Unisem (M) Berhad |
| Datasheet: | Download US1075CP datasheet File size : 37 kB |
| Request For quote: | Find where to buy US1075CP
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Datasheet text preview:
US1075
7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR FEATURES
1V Dropout at Full Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Output Current Limiting Built-in Thermal Shutdown
DESCRIPTION
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 PentiumTM P54CTM,P55CTM as well as GTL+ termination for Pentium ProTM and KlamathTM processor applications . The US1075 is also well suited for other processors such as CyrixTM,AMD and Power PCTMapplications. 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.
APPLICATIONS
Low Voltage Processor Applications such as : P54CTM,P55CTM,Cyrix M2TM, POWER PCTM,AMD GTL+ Termination PENTIUM PROTM, KLAMATHTM Low Voltage Memory Termination Applications Standard 3.3V Chip-Set and Logic Applications
TYPICAL APPLICATION
5V
C1 1500uF Vin
3
US1075
Vout
2
R1 121
3.3V
C2 2x 1500uF
Adj
1075app1-1.0
1
R2 200
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.
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
US1075
ABSOLUTE 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 INFORMATION
3 PIN PLASTIC TO220 ( T )
FRONT VIEW 3
3 PIN PLASTIC TO263 ( M )
FRONT VIEW
3 PIN PLASTIC POWER FLEX ( P )
FRONT VIEW
Vin Vout Adj
3
Vin Vout Adj Tab is Vout
3
Vin Vout Adj
Tab is Vout
2
Tab is Vout
2
2
1
1
1
JT=2.7°C/W JA=60°C/W
JA=35°C/W for 1" Square pad
JA=35°C/W for 1" Square pad
ELECTRICAL 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. PARAMETER Reference Voltage Line Regulation Load Regulation (note 1) Dropout Voltage (note 2) Current Limit Minimum Load Current (note 3) Thermal Regulation Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise SYM VREF TEST CONDITION MIN TYP Io=10mA,Tj=25°C,(Vin-Vo)=1.5V 1.238 1.250 Io=10mA, (Vin-Vo)=1.5V 1.225 1.250 Io=10mA,1.3V<(Vin-Vo)<7V Vin=3.3V,Vadj=0,10mAVO
IADJ
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 voltage drops 1% below its nominal value.
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.
2-34
Rev. 1.0 9/14/99
US1075
PIN DESCRIPTIONS
PIN # 1 2 3 PIN SYMBOL Adj Vout Vin PIN DESCRIPTION A resistor divider from this pin to the Vout pin and ground sets the output voltage. The output of the regulator. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. The input pin of the regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum drop out voltage during the load transient response. This pin must always be 1.3V higher than Vout in order for the device to regulate properly.
BLOCK DIAGRAM
Vin 3 2 Vout
+ +
1.25V CURRENT LIMIT
THERMAL SHUTDOWN
1075blk1-1.0
1 Adj
Figure 1 - Simplified block diagram of the US1050
APPLICATION INFORMATION
Introduction
The US1075 adjustable Low Dropout (LDO) regulator is a 3 terminal device which can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25 to 5.5 V.This regulator unlike the first generation of the 3T regulators such as LM117 that required 3V differential between the input and the regulated output,only needs 1.3V differential to maintain output regulation. This is a key requirement for today's microprocessors that need typically 3.3V supply and are often generated from the 5V supply. Another major requirement of these microprocessors such as the Intel P54CTM 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 current step at the regulator . In addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification.For example Intel VRETM specification calls for a total of ±100mV including initial tolerance,load regulation and 0 to 4.6A load step. The US1075 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 output capacitors.
Rev. 1.0 9/14/99
2-35
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