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| US1050-33 5A LOW DROPOUT POSITIVE FIXED 3.3V OUTPUT REGULATOR FEATURES Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Output Current Limiting Built-in Thermal Shutdown DESCRIPTION The US1050-33 product is a low dropout three terminal fixed 3.3V output regulator with minimum of 5A output current capability. This product is specifically designed to provide well regulated supply for low voltage IC applications requiring 3.3V output. The US 1050-33 is guaranteed to have <1.3V drop out at full load current making it ideal to provide well regulated output with supply voltage as low as 4.6V input. APPLICATIONS Standard 3.3V Chip-Set and Logic Applications TYPICAL APPLICATION 5V C1 330uF Vin 3 US1050-33 Vout Gnd 2 3.3V / 5A C2 330uF 1 1050-33app1-1.1 Typical application of US1050-33 Tj (C) 0 TO 150 3 PIN PLASTIC TO220 (T) US1050-33CT 3 PIN PLASTIC TO263 (M) US1050-33CM 2 PIN PLASTIC POWER FLEX (P) US1050-33CP 3 PIN PLASTIC TO252 (D) US1050-33CD Rev. 1.1 10/27/00 2-33 US1050-33 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 3 PIN PLASTIC TO220 ( T ) FRONT VIEW 3 3 PIN PLASTIC TO263 ( M ) FRONT VIEW 3 2 PIN PLASTIC POWER FLEX ( P ) 3 PIN PLASTIC TO252 ( D ) FRONT VIEW FRONT VIEW 3 Vin Vout Gnd Vin Vout Gnd Tab is Vout 4 Vin Tab is Vout 4 3 Vin Tab is Vout 2 Tab is Vout 2 1 1 1 Adj 1 Gnd JT=2.7C/W JA=60C/W JA=35C/W for 1" Square pad JA=70C/W for 1" Square pad JA=70C/W for 0.5" Sq pad ELECTRICAL SPECIFICATIONS Unless otherwise specified ,these specifications apply over ,Cin=1uF,Cout=10uF,and Tj=0 to 150C.Typical values refer to Tj=25C. PARAMETER Output 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 Change Temperature Stability Long Term Stability RMS Output Noise SYM Vo TEST CONDITION Io=10mA,Tj=25C,Vin=5V Io=10mA, Vin=5V Io=10mA,4.7V 1.1 5.1 5 0.01 60 70 0.2 0.5 0.3 0.003 5 1 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. 1.1 10/27/00 US1050-33 PIN DESCRIPTIONS PIN # 1 2 3 PIN SYMBOL Gnd Vout Vin PIN DESCRIPTION This pin must be connected to GND plane using a low inductance short connection. 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 1 Gnd 1050-33blk1-1.0 Figure 1 - Simplified block diagram of the US1050-33 APPLICATION INFORMATION Stability The US1050-33 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for microprocessor applications use standard electrolytic capacitors with a typical ESR in the range of 50 to 100 m and an output capacitance of 500 to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The US1050-33 takes advantage of this phenomena in making the overall regulator loop stable.For most applications a minimum of 100uF aluminum electrolytic capacitor such as Sanyo MVGX series ,Panasonic FA series as well as the Nichicon PL series insures both stability and good transient response. Rev. 1.1 10/27/00 2-35 |
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