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(R)
SPX1580
7A Ultra Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
FEATURES
Low Dropout Voltage 540mV at 7A Full Load Current Adjustable Ouput Down to 1.25V from ATX Power Supply Fixed Output Voltages of 3.3V and 2.5V Extremely Tight Load and Line Regulation Standard 5-Terminal Low Cost TO-220 and TO-263
ADJ OR FIXED SENSE VCNTRL VOUT VIN
SPX1580
SPX1580
5 Pin TO-220
5 Pin TO-263
1
2
3
12345
Replacement to Industry Standard LT1580
APPLICATIONS
ADJ OR FIXED SENSE
3.3V ATX Power Supplies 3.3V to 2.9V for Portable PENTIUMTM Processor 5V to 3.5V VRE Supply High efficiency "Green" Computer Systems
Now Available in Lead Free Packaging
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 C1 33F VCTRL 5 SPX1580 4 2 ADJ C2 10F R2 124 1 SENSE R1 124 C4 68F
C2 10F
3
VOUT
2.5V VOUT 3.3V VIN
5V VCTRL
VIN C1 33F VCTRL
VCNTRL
VOUT
VIN
5 SPX1580 4 2
3 1
VOUT
2.5V VOUT
SENSE GND
C4 68F
(1) VCTRL needed when VIN < 5V. (2) VOUT = VREF (1+R2/R1)+IADJ R2. (3) VREF is measured across adjust to sense.
(1) VCTRL needed when VIN < 5V.
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
(c)Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ..................................... Internally Limited Lead Temp. (Soldering, 10 Seconds) ......................... 300C Storage Temperature Range ..................... -65C to +150C Operating Junction Temperature Range SPX1580 Control Section ............................. 0C to +125C SPX1580 Power Transistor .......................... 0C to +150C Input Supply Voltage ..................................................... 7V VCTRL Input Voltage .................................................... 13.2V
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VOUT = VSENSE, VADJ = 0V, TA = 25C, CCTL = CPWR = COUT = 33F tantalum cap unless otherwise specified. The denotes the specifications which apply over the -40C to 85C temperature range, unless otherwise specified.
PARAMETER 2.5V Version Output Voltage
MIN.
TYP.
MAX.
UNITS
CONDITIONS
2.45 2.40
2.5 2.5
2.55 V 2.60
VCTRL = 4.5V to 12V, VIN = VOUT +0.8V, IO = 10mA to 7A
3.3V Version Output Voltage 3.234 3.168 All Voltage Options Reference Voltage (Note 3) 1.237 1.231 Line Regulation Load Regulation (Note 1) Dropout Voltage Minimum VIN (Note 2) (VIN - VOUT) Current Limit Minimum Load Current 7.1 Thermal Regulation Ripple Rejection Control Pin Current 60 Adjustable Pin Current 1.25 1.0 1.1 0.54 5 0.002 80 60 50 1.263 V 1.269 mV 3.0 mV 5.0 0.80 mA 10 0.02 mA 130 A 120 Thermal Resistance TO-220 & TO-263 2 60 C/W %/W dB 30mS Pulse VCTRL = 5V, VIN = 5V, IO = 7A VCTRL = 4.5V, VIN=VOUT + 0.8V, IO = 7A VCTRL = 4.5V, VIN= 2.05V, IO = 10mA Junction to Case (OC) J Junction to Ambient (OC) J
(c)Copyright 2004 Sipex Corporation
3.3 3.3
3.366 V 3.432

VCTRL = 4.5V to 12V, VIN = VOUT +0.8V, IO = 10mA to 7A
VCTRL = 4.5V, VIN = 2.05V, IO = 10mA VCTRL = 4.5V, VIN = 2.05V, IO = 10mA to 7A VCTRL = 4.5V to 12V, VIN = VOUT + 0.8V to 5.5V, IO = 10mA VCTRL = 4.5V to 12V, VIN = VOUT + 0.8V, IO = 10mA VCTRL = 4.75V, IO = 7A VCTRL = 4.5V, VIN = 2.05V, VOUT = 100mV VCTRL = 5V, VIN=VOUT + 0.8V
V A
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
2
PIN DESCRIPTION
Pin Number 1 Pin Name SENSE DESCRIPTION Allows Kelvin sense of VOUT at load. (Positive side of the reference voltage of the device) Negative side of the reference voltage for the device. Adding a small bypass capacitor from ADJ pin to ground will improve the transient response. Power output of the device. 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. 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.
2 3
ADJ VOUT
4
VCTRL
5
VIN
BLOCK DIAGRAM
(4) VCTRL VIN (5)
S.O.A
CURRENT LIMIT AMPLIFIER
LIMIT
SENSE
VOUT (3)
THERMAL OVERLOAD
SENSE (1)
VOLTAGE REGULATION AMPLIFIER
VREF
ADJ (2)
APPLICATION INFORMATION The SPX1580 is designed as a high performance and low cost solution for application requiring a lower dropout than traditional NPN regulators. 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. 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 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.
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
(c)Copyright 2004 Sipex Corporation
3
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 330F 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 0.3. 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. 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.
3.3V VIN 5V VCTRL
VIN C1 33F VCTRL
5 SPX1580 4 2 ADJ C2 10F
3 1
VOUT
2.5V VOUT
SENSE R1 124 C3 68F C4 0.033F
R2 124
(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
(c)Copyright 2004 Sipex Corporation
4
3.3V VIN 5V VCTRL C1 33F
VIN
5 SPX1580 4
3 1 2 GND
VOUT
2.5V VOUT
VCTRL
SENSE
C2 10F
C3 68F
(1) VCTRL needed when VIN < 5V.
Figure 2. Typical Fixed Regulator.
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
(c)Copyright 2004 Sipex Corporation
5
PACKAGE: 5 PIN TO-220
E E/2
A B
A
SEATING PLANE
Q H1
oP
F
D D1 L1
D CHAMFER OPTIONAL
CC
D
D L
e e1
b
C1 J1
A
5 PIN TO-220
Dimensions in (inches)
MIN NOM MAX
A b C1 D E e e1 F H1 J1 L L1 P Q U V
.160 .015 .014 .560 .385 .385 .062 .045 .234 .090 .540
-
.190 .040 .022 .590 .415 .415 .072 .055 .258 .115 .560 .250 .156 .113 -
.146 .103 -
.30 .24
5 PIN TO-220
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
(c)Copyright 2004 Sipex Corporation
6
PACKAGE: 5 PIN TO-263
SEATING PLANE
(DATUM A)
A C2
H
E 1 2 3 4 5 L2
(E)
c
E
L1
D1
5X b 4X e
E1
5 PIN TO-263 JEDEC TO-263 (BB) Variation A A1 b c c2 D1 E E1 e H L L1 L2 L3
Dimensions in (mm) MIN .160 0 .020 .015 .045 .270 .380 .245 NOM MAX .067 BSC .575 .070 .625 .110 .066 .070
c
.190 .010 .039 .029 .023 .420 (b)
0-8 L3
L
WITH PLATING
.010 BSC
BASE METAL CONTACT AREA
5 PIN TO-263
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
(c)Copyright 2004 Sipex Corporation
7
ORDERING INFORMATION
Part Number Operating Temperature Range Package Type
SPX1580U5 ................................................ -40C to +85C ........................................................ 5 Pin TO-220 SPX1580U5-2.5 .......................................... -40C to +85C ....................................................... 5 Pin TO-220 SPX1580U5-3.3 .......................................... -40C to +85C ....................................................... 5 Pin TO-220 SPX1580T5 ................................................ SPX1580T5/TR .......................................... SPX1580T5-2.5 .......................................... SPX1580T5-2.5/TR .................................... SPX1580T5-3.3 .......................................... SPX1580T5-3.3/TR .................................... -40C to +85C ........................................................ 5 Pin TO-263 -40C to +85C ........................................................ 5 Pin TO-263 -40C to +85C ....................................................... 5 Pin TO-263 -40C to +85C ....................................................... 5 Pin TO-263 -40C to +85C ....................................................... 5 Pin TO-263 -40C to +85C ....................................................... 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
(c)Copyright 2004 Sipex Corporation
8

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