SPX1580 ® 7A Ultra Dropout Voltage Regulator Fast Response, Adjustable & Fixed FEATURES ■ Low Dropout Voltage 540mV at 7A Full Load Current SPX1580 ■ Adjustable Ouput Down to 1.25V from ATX Power Supply 5 Pin TO-263 SPX1580 ■ Fixed Output Voltages of 3.3V and 2.5V 1 5 Pin TO-220 ■ Extremely Tight Load and Line Regulation 2 3 1 2 3 4 5 ■ 3.3V to 2.9V for Portable PENTIUMTM Processor ■ 5V to 3.5V VRE Supply VIN VOUT VCNTRL SENSE ■ 3.3V ATX Power Supplies ADJ OR FIXED APPLICATIONS VIN VOUT VCNTRL SENSE ■ Replacement to Industry Standard LT1580 ADJ OR FIXED ■ Standard 5-Terminal Low Cost TO-220 and TO-263 Now Available in Lead Free Packaging ■ High efficiency "Green" Computer Systems DESCRIPTION The SPX1580 is a 7A 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 or 2.5V and does not require any external resistors. The SPX1580 features a low dropout of 540mV(Typ.) and offers fast transient response. This device is suitable for Pentium applications requiring 2.5V from 3.3V ATX power supplies, where a low current input voltage 1V greater than the output voltage is available. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for the use of powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1580 is also an excellent choice as a post regulator for switching supplies applications. The SPX1580 offers protection against over-current faults, reversed input polarity, over temperature operation and positive and negative transient voltage. The SPX1580 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regualtors. For 5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data sheets respectively. TYPICAL APPLICATIONS CIRCUITS 3.3V VIN 5V VCTRL VIN 5 3 VOUT 2.5V VOUT 3.3V VIN SPX1580 C1 33µF 4 VCTRL 1 2 5V VCTRL SENSE ADJ VIN C4 68µF 3 4 VCTRL R1 124Ω C2 10µF 5 VOUT 2.5V VOUT SPX1580 C1 33µF 1 2 SENSE GND C2 10µF C4 68µF R2 124Ω (1) VCTRL needed when VIN < 5V. (2) VOUT = VREF (1+R2/R1)+IADJ R2. (3) VREF is measured across adjust to sense. Date: 5/14/04 (1) VCTRL needed when VIN < 5V. SPX1580 7A Ultra Dropout Voltage Regulator 1 ©Copyright 2004 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Power Dissipation ..................................... Internally Limited Lead Temp. (Soldering, 10 Seconds) ......................... 300°C Storage Temperature Range ..................... -65°C to +150°C Operating Junction Temperature Range SPX1580 Control Section ............................. 0°C to +125°C SPX1580 Power Transistor .......................... 0°C to +150°C Input Supply Voltage ..................................................... 7V VCTRL Input Voltage .................................................... 13.2V ELECTRICAL CHARACTERISTICS Electrical characteristics at VOUT = VSENSE, VADJ = 0V, TA = 25ºC, CCTL = CPWR = COUT = 33µF tantalum cap unless otherwise specified. The ♦ denotes the specifications which apply over the -40°C to 85°C temperature range, unless otherwise specified. PARAMETER MIN. TYP. MAX. 2.45 2.5 2.55 CONDITIONS UNITS 2.5V Version Output Voltage V 2.40 2.5 2.60 3.234 3.3 3.366 ♦ VCTRL = 4.5V to 12V, VIN = VOUT +0.8V, IO = 10mA to 7A 3.3V Version Output Voltage ♦ V 3.168 3.3 3.432 1.237 1.25 1.263 1.231 - 1.269 - 1.0 - ♦ VCTRL = 4.5V to 12V, VIN = VOUT +0.8V, IO = 10mA to 7A All Voltage Options Reference Voltage (Note 3) VCTRL = 4.5V, VIN = 2.05V, IO = 10mA V Line Regulation ♦ mV Load Regulation (Note 1) - - 3.0 - 1.1 mV - Minimum Load Current Ripple Rejection Control Pin Current Adjustable Pin Current 0.54 0.80 V VCTRL = 4.75V, IO = 7A 7.1 - - A VCTRL = 4.5V, VIN = 2.05V, VOUT = 100mV - 5 ♦ - 10 - 0.002 0.02 %/W 60 80 - dB VCTRL = 5V, VIN = 5V, IO = 7A - 60 mA VCTRL = 4.5V, VIN=VOUT + 0.8V, IO = 7A - - 130 - 50 120 Date: 5/14/04 VCTRL = 5V, VIN=VOUT + 0.8V - µA Thermal Resistance TO-220 & TO-263 VCTRL = 4.5V to 12V, VIN = VOUT + 0.8V, IO = 10mA 5.0 mA Thermal Regulation ♦ VCTRL = 4.5V to 12V, VIN = VOUT + 0.8V to 5.5V, IO = 10mA - Dropout Voltage Minimum VIN (Note 2) (VIN - VOUT) Current Limit ♦ VCTRL = 4.5V, VIN = 2.05V, IO = 10mA to 7A - 2 30mS Pulse ♦ ♦ ºC/W - 60 - SPX1580 7A Ultra Dropout Voltage Regulator 2 VCTRL = 4.5V, VIN= 2.05V, IO = 10mA Junction to Case (ØJC) Junction to Ambient (ØJC) ©Copyright 2004 Sipex Corporation PIN DESCRIPTION Pin Number Pin Name DESCRIPTION 1 SENSE 2 ADJ Negative side of the reference voltage for the device. Adding a small bypass capacitor from ADJ pin to ground will improve the transient response. 3 VOUT Power output of the device. 4 VCTRL Supply pin for the control circuitry of the device. The current flow into this pin will be about 1% of the output current. VCTRLmust be between 0.1V and 1.3V greater than the ouput voltage for the device to regulate. 5 VIN Allows Kelvin sense of VOUT at load. (Positive side of the reference voltage of the device) Output load current is supplied through this pin. VIN must be between 0.1V and 0.8V greater than the output voltage for this device to regulate. BLOCK DIAGRAM (4) VCTRL VIN (5) S.O.A LIMIT CURRENT LIMIT AMPLIFIER VOUT (3) SENSE THERMAL OVERLOAD SENSE (1) VOLTAGE REGULATION AMPLIFIER ADJ (2) VREF APPLICATION INFORMATION The SPX1580 is designed as a high performance and low cost solution for application requiring a lower dropout than traditional NPN regulators. A typical application would use 3.3V for VIN and 5.0V for VCTRL from a motherboard power supply to provide a nominal 2.5V output. Using the sense pin allows Kelvin measure the output, reducing resistance-associated errors. The SPX1580 uses a separate input voltage VCTRL ( VCTRL ≥ VOUT + 1.3V) to minimize the dropout voltage. This allows the 2.5V power for the load to come from a 3.3V system supply. As added benefit this will reduce the heat dissipation*, and lower heatsink and cooling fan cost. Date: 5/14/04 The SPX1580 can power the 2.5V core voltage for microprocessors such as a PentiumPCTM, P55CTM, AMD5k86TM and K6TM and the IBM PowerPCTM 603EV and 604EV processors. SPX1580 7A Ultra Dropout Voltage Regulator 3 ©Copyright 2004 Sipex Corporation APPLICATION INFORMATION Output Capacitor An output capacitor for SPX1580 is for circuit compensation for the device to prevent oscilliation. The minimum size of the output capacitor is either a 330µF aluminum electrolytic capacitor or 33uF tantalum. Larger capacitor values improve the regulator transient response performance and increase surge load capability. The output capacitor should have an ESR not more than 0.3Ω. Lowering Noise Using the SENSE pin to Kelvin the load will increase accuracy of the output voltage during load regulation. For the fixed voltage device, adding a bypass capacitor from ADJ pin to ground improves transient response. A 330pF ceramic capacitor is recommended. Adjustable Regulator Design 1.25V reference voltage is being developed between the SENSE pin and the ADJ pin of the SPX1580. Adding two external resistors (see fig 1.) will allow setting the output voltage from 1.25V to 6V. R1 is chosen so that this current is specified minimum load current of 10mA. R2 is given by the formula: VOUT = VREF (1+ R2/R1) + IADJ (R2). The current flowing from the ADJ pin is typicaly 50uA. This ADJ pin contributes to the final VOUT but is usually neglected. Connecting the sense pin to the top of the resistor divider will improve load regualtion. 3.3V VIN 5V VCTRL VIN 5 3 VOUT 2.5V VOUT SPX1580 C1 33µF 4 VCTRL 1 2 SENSE ADJ R1 124Ω C3 68µF C2 10µF C4 0.033µF R2 124Ω (1) VCTRL needed when VIN < 5V. (2) VOUT = VREF (1+R2/R1)+IADJ R2. (3) VREF is measured across adjust to sense. Figure 1. Adjustable Regulator. Date: 5/14/04 SPX1580 7A Ultra Dropout Voltage Regulator 4 ©Copyright 2004 Sipex Corporation VIN 3.3V VIN 5 3 VOUT SPX1580 5V VCTRL 4 VCTRL C1 33µF 2.5V VOUT 1 2 SENSE GND C2 10µF C3 68µF (1) VCTRL needed when VIN < 5V. Figure 2. Typical Fixed Regulator. Date: 5/14/04 SPX1580 7A Ultra Dropout Voltage Regulator 5 ©Copyright 2004 Sipex Corporation PACKAGE: 5 PIN TO-220 E A B E/2 SEATING PLANE A øP Q F H1 D D1 D L1 D C C CHAMFER OPTIONAL D L A b e C1 e1 J1 5 PIN TO-220 Dimensions in (inches) MIN .160 - .190 b .015 - .040 C1 .014 - .022 D .560 - .590 E e .385 - .415 .385 - .415 e1 .062 - .072 F H1 .045 - .055 .234 - .258 J1 L .090 - .115 .540 - .560 L1 Date: 5/14/04 NOM MAX A - .250 ∆P .146 - .156 Q .103 - .113 U - .30 - V - .24 - 5 PIN TO-220 SPX1580 7A Ultra Dropout Voltage Regulator 6 ©Copyright 2004 Sipex Corporation PACKAGE: 5 PIN TO-263 SEATING PLANE A (DATUM A) C2 H E 1 2 3 5 4 c L2 (E) E L1 D1 5X b E1 4X e 5 PIN TO-263 JEDEC TO-263 (BB) Variation Dimensions in (mm) MIN NOM MAX A .160 - A1 0 - .010 b .020 - .039 c .015 - .029 c2 .045 .190 - D1 .270 - - E .380 - .420 E1 .245 - - e L3 .575 - .625 L .070 - .110 - .066 - .070 L1 - L2 - L (b) .067 BSC H L3 0º-8º .023 WITH PLATING c .010 BSC BASE METAL CONTACT AREA 5 PIN TO-263 Date: 5/14/04 SPX1580 7A Ultra Dropout Voltage Regulator 7 ©Copyright 2004 Sipex Corporation ORDERING INFORMATION Part Number Operating Temperature Range Package Type SPX1580U5 ................................................ -40°C to +85°C ........................................................ 5 Pin TO-220 SPX1580U5-2.5 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-220 SPX1580U5-3.3 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-220 SPX1580T5 ................................................ SPX1580T5/TR .......................................... SPX1580T5-2.5 .......................................... SPX1580T5-2.5/TR .................................... SPX1580T5-3.3 .......................................... SPX1580T5-3.3/TR .................................... -40°C to +85°C ........................................................ 5 Pin TO-263 -40°C to +85°C ........................................................ 5 Pin TO-263 -40°C to +85°C ....................................................... 5 Pin TO-263 -40°C to +85°C ....................................................... 5 Pin TO-263 -40°C to +85°C ....................................................... 5 Pin TO-263 -40°C to +85°C ....................................................... 5 Pin TO-263 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX1582T5-3.3/TR = standard; SPX1580T5-L-3.3/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-263. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 5/14/04 SPX1580 7A Ultra Dropout Voltage Regulator 8 ©Copyright 2004 Sipex Corporation