SSPPXX11558877 33AA LLooww DDrrooppoouutt VVoollttaaggee RReegguullaattoorr September 2010 Rev. 2.0.0 GENERAL DESCRIPTION APPLICATIONS The SPX1587 is a low power positive-voltage Desktop PC s Servers regulator designed to satisfy moderate power Powering VGA and Sound Cards requirements with a cost effective, small footprint solution. Adjustable Power Supplies Portable Instrumentation This device is an excellent choice for use in battery-powered applications and portable computers. The SPX1587 features very low FEATURES quiescent current and a low dropout voltage of 1.1V at a full load. As output current Guaranteed 3A Output Current decreases, quiescent current flows into the Three Terminal Adjustable or Fixed load, increasing efficiency. SPX1587 is 1.5V, 2.5V, 3.3V and 5.0V available in adjustable or fixed 1.5V, 2.5V, 3.3V and 5.0V output voltages. Low Quiescent Current The SPX1587 is offered in several 3-pin Low Dropout Voltage: 1.1V at 3A surface mount packages: TO-252, TO-220 and Line Regulation: 0.1% TO-263. An output capacitor of 10 F ceramic or tantalum provides unconditional stability. Load Regulation: 0.1% Stable with 10uF Ceramic Capacitor Over Current and Thermal Protection Similar to Industry Standard LT1085/LT1585 RoHS Compliant Lead Free 3-Pin TO-220, TO-252 and TO-263 Packages FUNCTIONAL DIAGRAM Fig. 1: SPX1587 Functional Diagram (Adjustable version) Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SSPPXX11558877 33AA LLooww DDrrooppoouutt VVoollttaaggee RReegguullaattoorr ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Junction Temperature Range .................... -40C to 125C the device at these ratings or any other above those Thermal Resistance indicated in the operation sections of the specifications TO-220 ...................................................... 3C/W JC below is not implied. Exposure to absolute maximum TO-220 ................................................. 29.4C/W JA rating conditions for extended periods of time may affect TO-263 ...................................................... 3C/W JC reliability. TO-263 ................................................. 31.4C/W JA Input Supply Voltage V .................................... +10.0V IN TO-252 ...................................................... 6C/W JC Input to Output Voltage ....................................... +8.8V TO-252 .................................................... 50C/W JA Storage Temperature .............................. -65C to 150C Power Dissipation ................................ Internally Limited Lead Temperature (Soldering, 5 sec) ..................... 260C ESD Rating (HBM - Human Body Model) .................... 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Ambient Temperature of T = 25C only limits applying over the full A Operating Temperature range (-40C to +85C) are denoted by a . Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T = 25C, and A are provided for reference purposes only. Unless otherwise indicated, V = V + 1.5V, T = 25C, C = C =10F, IN OUT A IN OUT I =10mA. OUT Parameter Min. Typ. Max. Units Conditions 1.5V Version 1.500 1.515 I =10mA, V =3.5V Output Voltage 1.485 OUT OUT V SPX1587A 1.530 10mA I 3A, 3.0V V 10V 1.470 OUT OUT 2.5V Version 2.450 2.500 2.550 I =10mA, V =4.5V Output Voltage OUT OUT V SPX1587 2.425 2.575 10mA I 3A, 4.25V I 10V OUT OUT 3.3V Version 3.300 3.333 I =10mA, V =5V 3.267 OUT OUT Output Voltage V SPX1587A 3.234 3.366 10mA I 3A, 4.75V V 10V OUT OUT 3.234 3.300 3.366 I =10mA, V =5V Output Voltage OUT OUT V SPX1587 3.399 10mA I 3A, 4.75V V 10V 3.201 OUT OUT 5.0V Version 4.950 5.000 5.050 I =10mA, V =7V Output Voltage OUT OUT V SPX1587A 4.900 5.100 10mA I 3A, 6.50V V 10V OUT OUT All Voltage Options 1.250 1.262 I =10mA, V -V =2V Reference Voltage 1.238 OUT IN OUT V SPX1587A 1.275 10mA I 3A, 1.50V V -V 10V 1.225 OUT IN OUT 1.225 1.250 1.275 I =10mA, V -V =2V Reference Voltage OUT IN OUT V SPX1587 1.212 1.287 10mA I 3A, 1.50V V -V 10V OUT IN OUT Output Voltage Temperature 0.3 % Stability SPX1587A Output Voltage Temperature 0.5 % Stability SPX1587 3.0V V 10V, V =1.5V IN OUT 4.25V V 10V, V =2.5V IN OUT Line Regulation 0.1 0.2 % 4.75V V 10V, V =3.3V IN OUT 6.50V V 10V, V =5.0V IN OUT 10mA I 3A, V =1.5V OUT OUT 10mA I 3A, V =2.5V OUT OUT Load Regulation 0.1 0.3 % 10mA I 3A, V =3.3V OUT OUT 10mA I 3A, V =5.0V OUT OUT 2010 Exar Corporation 2/11 Rev. 2.0.0