SPX1585 5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response FEATURES APPLICATIONS Adjustable Output Down To 1.2V Powering VGA & Sound Card TM Fixed Output Voltages 1.5V, 2.5V, 3.3V Power PC Supplies Output Current Of 5A SMPS Post-Regulator Low Dropout Voltage 1.1V Typ 5A. High Efficiency Green Computer Systems Extremely Tight Load And Line Regulation High Efficiency Linear Power Supplies Current & Thermal Limiting Portable Instrumentation Standard 3-Terminal Low Cost TO-263 Constant Current Regulators Similar To Industry Standard LT1085/LT1585 Adjustable Power Supplies Battery charger Now Available in Lead Free Packaging PRODUCT DESCRIPTION The SPX1585 is a low power 5A adjustable and fixed voltage regulator that is very easy to use. It requires only 2 exte rnal resistors to set the output voltage for the adjustable version. The SPX1585 devices are designed for low voltage applications that offe r lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocess ors that require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies, and as a post regulator for switching supplies applica- tions. The SPX1585 features low dropout of a maximum 1.2 volts. The SPX1585 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and p ositive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The I of this device flows into the load, w h ich increases Q efficiency. The SPX1585 devices are offered in a 3-pin TO-263 package compatible with other 3 terminal regulators. For an 8A low dropout re- gulator, refer to the SPX1584 da ta sheet. PIN CONNECTIONS TO-263-3 (T) V 3 IN SPX1585 2 V OUT 1 ADJ/GND Top View Note that TAB is connected to VOUT. 1/7SPX1585 ABSOLUTE MAXIMUM RATINGS Lead Temp. (Soldering, 10 Seconds) .............................. 300C Input Voltage........................................................ 10V Storage Temperature Range ............................ -65 to +150C Input to Output Voltage Differential .................. 10V Operating Junction Temperature Range SPX1585 Control Section.......................... -45C +125C SPX1585 Power Transistor.........................-45C +150C ELECTRICAL CHARACTERISTICS (NOTE 1) at I = 10mA, T =25C, unless otherwise specified. OUT A PARAMETER CONDITIONS Typ SPX1585A SPX1585 UNITS Min Max Min Max 1.5V Version Output Voltage (Note 2) SPX1585-1.5V, 0 < I < 5A, 3.3V<V <10V 1.5 1.485 1.515 1.47 1.53 V OUT IN 1.47 1.53 1.455 1.545 2.5V Version Output Voltage (Note 2) SPX1585-2.5V, 0 < I < 5A, 4.0V<V <10V 2.5 2.475 2.525 2.45 2.55 V OUT IN 2.45 2.55 2.425 2.575 3.3V Version Output Voltage (Note 2) SPX1585-3.3V, 0 < IOUT< 5A, 4.8V<VIN<10V 3.3 3.267 3.333 3.234 3.366 V 3.234 3.366 3.069 3.399 All Voltage Options Reference Voltage (Vref) V V 7V, P P 1.250 1.225 1.270 1.225 1.270 IN MAX 1.5V (V -V )5.75V, 10mAI 5A IN OUT OUT Min. Load Current (Note 3) 1.5V (V V )5.75V 5 10 10 mA IN OUT 0.005 0.2 0.2 % Line Regulation (Vref(Vin)) 2.75VV 7V, Iout=10mA, T =25C IN J (Note 3) V 7V, I =0mA, T =25C (Note 2) 0.005 0.2 0.2 IN OUT J 0.05 0.3 0.3 % Load Regulation(Vref(Iout)) 10mAI 5A, (V -V )=3V, T =25C (Note 3) OUT IN OUT J 0.05 0.3 0.3 0IOUT 5A, VIN=7V, TJ=25C (Note 2) Dropout Voltage V =1% I = 5A (Note 3) 1.1 1.2 1.2 REF OUT I < 5A (Note 2) OUT Current Limit V =7V 6 5.2 5.2 A IN Iout(MAX) 1.4V (V - V ) (Note3) IN OUT Long Term Stability T =125C, 1000 Hrs. 0.3 1 1 % A (Note 2) Thermal Regulation T =25C, 20 ms pulse 0.01 0.020 0.020 %/W A (Vout(Pwr)) Temperature Stability 0.25 % (Vout(T)) Output Noise, RMS 10Hz to 10kHz T =25C 0.003 % Vo A Thermal Resistance TO-220 Junction to Tab 3.0 3.0 C/W Junction to Ambient 60 60 DD Package Junction to Tab 3.0 3.0 Junction to Ambient 60 60 The Bold specifications apply to the full operating temperature range. Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 2: Fixed Version Only Note 3: Adjustable Version Only 2/7