US1010-33 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR PRELIMINARY DATASHEET DESCRIPTION FEATURES Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 1% Output Voltage Initial Accuracy Built-in Thermal Shutdown Available in SOT-223, D-PAK , Power Flex and 8 pin SOIC Surface Mount Packages APPLICATIONS VGA & Sound Card Applications Standard 3.3V Chip-Set and Logic Applications The US1010-33 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 such as VGA , sound & DVD cards. The US 1010 is guaranteed to have <1.3V drop out at full load current making it ideal to provide well regulated with 4.75V to 7V 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 US1010-33 Vout 2 3.3V / 1A C2 10uF Gnd 1 1010-33app1-1.0 Typical Application of US1010-33 in a 5V to 3.3V regulator . PACKAGE ORDER INFORMATION Tj (C) 0 TO 150 Rev. 1.2 10/30/00 2 PIN PLASTIC TO252 (D) US1010-33CD 3 PIN PLASTIC SOT223 (Y) US1010-33CY 2 PIN PLASTIC POWER FLEX (P) US1010-33CP 8 PIN PLASTIC SOIC (S) US1010-33CS 2-1 US1010-33 ABSOLUTE MAXIMUM RATINGS Input Voltage (Vin) .................................................................. 7V Power Dissipation ............................................ Internally Limited Storage Temperature Range .............................. -65C TO 150C Operating Junction Temperature Range .................. 0C TO 150C PACKAGE INFORMATION 2 PIN PLASTIC TO252 ( D ) 3 PIN PLASTIC SOT223 ( Y ) 3 Tab is Vout 2 PIN POWER FLEX ( P ) TOP VIEW FRONT VIEW Vin 4 1 Vin 2 Vout 1 Gnd Gnd JA=70C/W for 0.5" Sq pad TOP VIEW FRONT VIEW 3 Tab is Vout 3 PIN PLASTIC SOT223 ( Y ) JA=90C/W for 0.4" Sq pad 3 Tab is Vout Vin NC NC Gnd Vin 4 1 Gnd JA=70C/W for 0.5" Sq pad 1 8 2 7 3 6 4 5 Vout Vout Vout Vout JA=55C/W for 1" Sq pad ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over, Cin=1uF, Vin=5V,Cout=10uF, and Tj=0 to 125C.Typical values refer to Tj=25C. 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=25C 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=125C,1000 Hrs Tj=25C 10hz<f<10khz MIN TYP 3.267 3.300 3.235 3.300 MAX 3.333 3.365 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. 1.2 10/30/00 US1010-33 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 1010-33blk1-1.0 Figure 1 - Simplified block diagram of the US1010-33 Rev. 1.2 10/30/00 2-3