SPX1582 3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed FEATURES Low Dropout Voltage 500mV at 3A Full Load Current SPX1582 5 Pin TO-263 Adjustable Ouput Down to 1.25V from ATX Power Supply SPX1582 1 2 3 4 5 Fixed Output Voltages of 3.3V and 2.5V 5 Pin TO-220 1 2 3 4 5 Extremely Tight Load and Line Regulation Standard 5-Terminal Low Cost TO-220 and TO-263 APPLICATIONS 3.3V to 2.8V ATX Power Supplies TM 3.3V to 2.9V for Portable PENTIUM Processor 5V to 3.5V VRE Supply High efficiencyGree Computer Systems Now Available in Lead Free Packaging DESCRIPTION The SPX1582 is a 3A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only two external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does not require any external resistors. The SPX1582 features a low dropout of 400mV(Typ.) and offers fast transient response. This device is suitable for Pentium applications requiring 2.8V, 2.5V from 3.3V ATX power supplies, where low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for the use in powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1582 is also an excellent choice as a post regulator for switching supply applications. The SPX1582 offers protection against over-current faults, reversed input polarity, over temperature operation and positive or negative transient voltages. The SPX1582 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data sheets respectively. TYPICAL APPLICATIONS CIRCUIT V V IN OUT 2.5V 3.3V 5 3 V V OUT IN V V 3.3V IN OUT 2.5V C1 SPX1582 5 3 V V OUT 330 F IN C1 SPX1582 5V 4 1 330F V CTRL V 2 5V 4 1 CTRL SENSE V CTRL V 2 CTRL SENSE R1 ADJ 124 GND C4 C2 C4 2x330 F C2 2x330F 10 F 10 F C3 R2 .033 F 124 (1) V needed when V < 5V. CTRL IN (1) V needed when V < 5V. CTRL IN (2) V = V (1+R /R )+I R . OUT REF 2 1 ADJ 2 (3) V is measured across adjust to sense. REF Adjustable Regulator Typical Fixed Regulator Jun 17-06 Rev F SPX1582 3A Ultra Low Dropout Voltage Regulator 2006 Sipex Corporation 1 SENSE ADJ OR FIXED V OUT V CNTRL V IN SENSE ADJ OR FIXED V OUT V CNTRL V INABSOLUTE MAXIMUM RATINGS V Input Voltage ....................................................... 13V Power Dissipation ..................................... Internally Limited CTRL Storage Temperature Range ..................... -65C to +150C Operating Junction Temperature Range SPX1582 Control Section ............................. 0C to +125C SPX1582 Power Transistor .......................... 0C to +150C Input Supply Voltage ................................................ 6V ELECTRICAL CHARACTERISTICS Electrical characteristics at V = V , V = 0V, T =25C, C = C = C = 33F tantalum cap unless OUT SENSE ADJ A CTL PWR OUT otherwise specified. The denotes the specifications which apply over full temperature range -40C to +85C, unless otherwise specified. PARAMETER MIN TYP MAX UNITS CONDITIONS 2.5V Version Output Voltage 2.450 2.5 2.550 V V = 6.0V to 12V, V = 3.0V to 5.0V, I =10mA CTRL IN O 2.400 2.600 I = 10mA to 3A O 2.8V Version Output Voltage 2.744 2.8 2.856 V V = 6.3V to 12V, V =3.3V + 0.8V, I =10mA CTRL IN O 2.688 2.912 I = 10mA to 3A O 3.3V Version Output Voltage 3.234 3.3 3.366 V V = 6.3V to 12V, V = 3.3V + 0.8V, I =10mA CTRL IN O 3.168 3.3 3.432 I = 10mA to 3A O All Voltage Options Reference Voltage 1.238 1.25 1.263 V V = 2.75V, V = 2.00V, I = 10mA CTRL IN O V =2.7V to 12V,V = 2.05V to 5.5V,I =10mA to 7A CTRL IN O Line Regulation mV V = 2.5V to 12V, V = 1.75 to 5.5V, I =10mA CTRL IN O 1.0 3.0 V = 0V ADJ Load Regulation (Note 1) 1.0 5.0 mV V = 2.75V, V = V 1.5V, I =10mA to 3A, V = CTRL IN OUT + O ADJ 0V Dropout Voltage Min. V 1.05 1.18 V V = 0V CTRL ADJ (Note 2) (V - V ) V = 2.05V, I = 1A IN OUT IN O Dropout Voltage Min. V 0.40 0.50 V V = 0V IN ADJ (Note 2) (V - V ) V = 2.75V, I = 3A IN OUT IN O Current Limit 3.1 A V = 2.75V, V = 2.05V, V = 100mV, V = 0V CTRL IN OUT ADJ Minimum Load Current 5 10 mA V = 5V, V =3.3V, V =0V CTRL IN ADJ Thermal Regulation 0.002 0.02 %/W 30ms Pulse Ripple Rejection 60 80 dB V = 3.75V, V = 3.75V, I = 2.3A, V =0V CTRL IN O ADJ T =25, V =1Vpp at 120Hz J RIPPLE Control Pin Current 60 120 mA V = 0V ADJ V = 2.75V, V = 2.05V, I = 3A CTRL IN O Adjustble Pin Current 50 A V = 2.75V, V = 2.05V, V =0V, I = 10mA CTRL IN ADJ O 120 Thermal Resistance 3 C/W Junction to Case ( ) JC TO-220-5 29.3 C/W Junction to Ambient ( ) JA Thermal Resistance 3 C/W Junction to Case ( ) JC TO-263-5 31.2 C/W Junction to Ambient ( ) JA Note 1: Low duty cycle pulse testing with Kelvin connections is required to order to maintain accurate data. Note 2: Dropout voltage is defined as the minimum differential between V and V or V and V required to IN OUT CTRL OUT maintain regulation at V 95% Nominal V . OUT OUT Note 3: V is measured across Adjust pin to Sense pin. REF Jun 17-06 Rev F SPX1582 3A Ultra Low Dropout Voltage Regulator 2006 Sipex Corporation 2