US1010-25 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR DESCRIPTION FEATURES Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Built-in Thermal Shutdown Available in SOT-223 & D-PAK and a new Power Flex Surface Mount Packages APPLICATIONS Low Voltage IC supply Applications PC Clock Supply Voltage PRELIMINARY DATASHEET The US1010-25 is a low dropout three terminal fixed output regulator with minimum of 1A output current capability. This product is specifically designed to provide well regulated supply for low voltage IC applications as well as generating clock supply for the PC applications. The US 1010 is guaranteed to have <1.3V drop out at full load current making it ideal to provide well regulated with 3.8V input supply. The US1010 is specifically designed to be stable with low cost Aluminimum capacitors while still maintains stability with low ESR tantalum caps as well. TYPICAL APPLICATION 5V C1 10uF Vin 3 US1010-25 Vout 2 2.5V / 1A C2 10uF Gnd 1 1010-25app1-1.0 Typical Application of US1010-25 in a 5V to 2.5V regulator . PACKAGE ORDER INFORMATION Tj (°C) 0 TO 150 Rev. 1.1 10/30/00 2 PIN PLASTIC TO252 (D) US1010-25CD 3 PIN PLASTIC SOT223 (Y) US1010-25CY 2 PIN PLASTIC POWER FLEX (P) US1010-25CP 2-1 US1010-25 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 2 PIN PLASTIC TO252 ( D ) 3 PIN PLASTIC SOT223 ( Y ) FRONT VIEW 3 Tab is Vout 2 PIN POWER FLEX ( P ) TOP VIEW Vin Tab is Vout 4 1 Gnd FRONT VIEW 3 Vin 2 Vout 1 Gnd θJA=70°C/W for 0.5" Square pad θJA=90°C/W for 0.4" Square pad Tab is Vout 3 Vin 1 Gnd 4 θJA=70°C/W for 0.5" Square pad ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over, Cin=1uF, Vin=5V,Cout=10uF, and Tj=0 to 125°C.Typical values refer to Tj=25°C. PARAMETER Output Voltage Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) Current Limit Thermal Regulation Ripple Rejection Temperature Stability Long Term Stability RMS Output Noise SYM Vo TEST CONDITION Io=10mA,Tj=25°C Io=10mA Io=10mA,4.75V<Vin<7V 10mA<Io<1A Io=1A dVo=100mV 30 mS PULSE, Io=1A f=120HZ ,Co=25uF Tan Io=0.5A Io=10mA Tj=125°C,1000 Hrs Tj=25°C 10hz<f<10khz MIN TYP 2.475 2.500 2.450 2.500 MAX 2.525 2.550 7 17 1.3 UNITS V 0.02 %/W 1.1 0.01 60 70 0.5 0.3 0.003 mV mV V A dB 1 % % %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 voltage drops 1% below its nominal value. 2-2 Rev. 1.1 10/30/00 US1010-25 PIN DESCRIPTIONS PIN# PIN SYMBOL 1 Gnd 2 Vout 3 Vin Pin Description Gnd pin. This pin must be connected to GND plane using a low inductance short connection. The output of the regulator. This pin is also connected to the tab of the package. An output capacitor must be connected to this pin to insure stability of the regulator. Input pin of the regulator. BLOCK DIAGRAM Vin 3 2 Vout + 1.25V + CURRENT LIMIT THERMAL SHUTDOWN 1 Gnd 1010-25blk1-1.0 Figure 1 - Simplified block diagram of the US1010-25 Rev. 1.1 10/30/00 2-3