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(R)
P 5
A
SPX29501/02
Rev. B
5A Low Dropout Voltage Regulator
November 2008
FEATURES
Adjustable Output Down to 1.25V 1% Output Accuracy Output Current of 5A Low Dropout Voltage: 420mV @ 5A Tight Line Regulation: 0.06% Load Regulation: 0.2% Fast Transient Response Reverse-Battery Protection Current Limit and Thermal Protection Powering VGA & Sound Card Power PCTM Supplies SMPS Post Regulator High Efficiency "Green" Computer Systems High Efficiency Linear Power Supplies Constant Current Regulators Adjustable Power Supplies Battery Charger
SPX29502
5 Pin TO-263
SP29500
3 Pin TO-220
1
2
3
1
2
3
APPLICATIONS
INPUT OUTPUT ADJUST GND EN
VIN GND VOUT
Now Available in Lead Free Packaging
DESCRIPTION
The SPX29501/02 are 5A highly accurate voltage regulators with a low dropout voltage of 420mV @ 5A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over-current, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy. Other features include Enable, and Error Flag. The SPX295001/02 are offered in 5-pin TO-220 & TO-263 packages. For a 1.5A version, refer to the SPX29150 data sheet. For a 3A version, refer to the SPX29300 datasheet.
TYPICAL APPLICATION CIRCUITS
1 SPX29502 + 2 GND 3 5 ADJ 4 + R1
VIN
6.8F +
1 SPX29500 3 2 + 22F
VOUT
V IN 6.8F
V OUT 22F
R2
Figure 1. Fixed Output Linear Regulator
Exar Corporation 48720 Kato Road, Fremont CA 94538, USA
Figure 2. Adjustable Output Linear Regulator
www.exar.com Tel. +1 510 668-7000 - Fax. +1 510 668-7001
ABSOLUTE MAXIMUM RATINGS
Lead Temperature (soldering, 5 seconds) ................260C Storage Temperature Range........................-65C to +150C Operating Junction Temperature Range......-40C to +125C Input Voltage (Note 1) .................................................... 20V
OPERATING RATINGS
Input Voltage ................................................................... 16V
ELECTRICAL CHARACTERISTICS
Specifications are at VIN = VOUT + 1V and IOUT = 10mA, CIN = 6.8F, COUT = 22F, TA = 25C, unless otherwise specified. The denotes the specifications which apply over the full operating temperature range, unless otherwise specified. PARAMETER Fixed Voltage Options 1.8V Version Output Voltage 2.5V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Line Regulation Load Regulation V/T Dropout Voltage, except 1.8V Ground Current (Note 4) Ground Pin Current at Dropout Current Limit Output Noise Voltage (10Hz to 100kHz) IL=100mA Reference Voltage Reference Voltage Adjust Pin Bias Current Reference Voltage Temp. Coeff. Adjust Pin Bias Current Temp. Coeff. 1.228 1.215 1.203 40 20 0.1 4.950 4.900 5.000 5.000 0.06 0.2 20 90 250 420 20 70 3 7.5 425 350 1.240 1.252 1.265 1.277 80 120 V V nA ppm/C nA/C (Note 6) Adjustable version only (Note 7) 10 5.050 5.100 0.5 1 100 250 800 50 mA mA A VRMS V IOUT = 10mA 10mA IOUT 5A, 6.0V VIN 16V IOUT=10mA,(VOUT+1V) VIN 16V VIN=VOUT+2V, 10mA IOUT IFL (Note 2) VOUT Temp Coefficient (Note 5) IOUT=250mA eg IOUT=2.5A IOUT=5A IOUT=2.5A IOUT=5A VIN=0.5V less than specified VOUT, IOUT=10mA (Note 3) CL=22F CL=33F Adjustable version only 3.267 3.234 3.300 3.300 3.333 3.366 V IOUT = 10mA 10mA IOUT 5A, 4.3V VIN 16V 2.475 2.450 2.500 2.500 2.525 2.550 V IOUT = 10mA 10mA IOUT 5A, 3.5V VIN 16V 1.782 1.764 1.800 1.800 1.818 1.836 V IOUT = 10mA 10mA IOUT 5A, 2.8V VIN 16V MIN TYP SPX29501 MAX UNITS CONDITIONS
SPX29501/02 % % ppm/C mV
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
2
ELECTRICAL CHARACTERISTICS: Continued
Specifications are at VIN = VOUT + 1V and IOUT = 10mA, CIN = 6.8F, COUT = 22F, TA = 25C, unless otherwise specified. The denotes the specifications which apply over the full operating temperature range, unless otherwise specified. PARAMETER Flag Output (Error Comparator) Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Enable Input Input Logic Voltage Low (OFF) High (ON) ENABLE Input Current 40 25 MIN TYP SPX29501 0.01 220 60 75 15 SPX29501/02 0.8 2.4 100 0.6 Regulator Output Current in Shutdown Thermal Resistance 10 500 2 60 2 60 C/W 600 750 2 4 A A A TO-220 Junction to Case, at Tab TO-220 Junction to Ambient TO-263 Junction to Case, at Tab TO-263 Junction to Ambient (Note 9) VEN=0.8V VEN=16V V (Note 10) 95 140 1 2 300 400 A mV mV mV mV Device set for 5V, (Note 8) Device set for 5V, (Note 8) Device set for 5V, (Note 8) Device set for 5V,VIN=4.5V, IOL=250A VOH=16V MAX UNITS CONDITIONS
NOTES: Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle of less than 1%. The maximum continuous supply voltage is 16V. Note 2: Full load current (IFL) is defined as 5A. Note 3: VIN = VOUT (NOMINAL) +1V. For example, use VIN = 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. Note 4 Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. Note 5: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 6: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied, excluding load / line regulation effects. Specifications for a 200mA load pulse as VIN = 20V (a 4W pulse) for t = 10ms. Note 7: VREF VOUT (VIN-1), 2.3VVIN 16V, 10mA IL IFL, Tj < Tjmax. Note 8: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 383mV. Threshold remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 9: VEN 0.4V and VIN 16V, VOUT = 0. Note 10: Measured with IOUT = IOUT MIN (10mA).
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
3
FUNCTIONAL DIAGRAM
IN O.V I LIMIT FLAG + 1.180V Reference 1.240V + ADJ EN Thermal Shutdown 20V R1* OUT
R2*
GND
TYPICAL PERFORMANCE CHARACTERISTICS
600
120 110 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 Output Current (A)
550 500
Ground Current (mA)
Dropout (mA)
450 400 350 300 250 200 150 100 50 0 1 2 3 4 5 6
Output Current (A)
Figure 3. Ground Current (mA) vs. Output Current (A)
Figure 4. Dropout (mV) vs. Output Current (A)
VOUT (AC)
VOUT (AC)
IOUT (2A/DIV)
VIN
Figure 5. Load Transient (VIN=4V, VO=3.3V, COUT=22F, 10mA~5A)
Rev:B Nov 2008
Figure 6. Line Transient (COUT=22F, IO=10mA)
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
4
APPLICATION INFORMATION The SPX29501/02 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage.
Thermal Considerations
load transient response is needed. If the power source has a high AC impedance, a 0.1F ceramic capacitor between input & ground is recommended.
Minimum Load Current
Although the SPX29501/02 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mounting is required.
TO-220 Design Example:
To ensure a proper behavior of the regulator under light load, a minimum load of 10mA for SPX29501/02 is required.
Adjustable Regulator Design
The SPX29502 is an adjustable regulator that can be programmed to any value between 1.24V and 16V using 2 resistors, R1 and R2. The relationship between the resistors is: R1 = R2(VOUT/1.24-1).
Error Flag
Assume that VIN = 8V, VOUT = 5V, IOUT = 5A, TA = 50C, HA= 1C/W, CH= 2C/W, and JC= 2C/W, where: TA = ambient temperature, HA= heatsink to ambient thermal resistance CH= case to heatsink thermal resistance JC = junction to case thermal resistance The power calculated under these conditions is: PD = (VIN - VOUT) * IOUT = 15W. And the junction temperature is calculated as TJ = TA + PD * (HA + CH + JC) or TJ = 50 + 15 * (1+2+2) = 125C Reliable operation is insured.
Capacitor Requirements
The SPX29501 features an error flag that indicates either an over current or under voltage condition. The flag output goes low, sinking 10mA when either condition occurs.
Enable Input
The SPX29501/02 have an Enable function that switches the regulator on and off. Their thresholds are TTL compatible. Enabling the regulator requires approximately 20A of current.
Typical Application Circuits
Figure 1 represents at typical fixed output regulator. Figure 2 represents an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows: VOUT =VREF * [1 + (R1/R2)]. For best results, the total series resistance should guarantee a minimum regulator load current of 10mA.
The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 22F aluminum capacitor will guarantee stability over all load conditions. A tantalum capacitor is recommended if a faster
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
5
PACKAGES
TO-263-5 Package (T5)
1
2
3
1 2345
SPX29500 1) VIN 2)GND 3) VOUT
SPX29501 1) ENABLE 2)INPUT 3) GND 4) OUTPUT 5) FLAG
SPX29502 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
SPX29503 1) FLAG 2)INPUT 3) GND 4) OUTPUT 5) ADJUST
Top View Front View TO-220-3 Package (U) TO-220-5 Package (U5)
1
2
3
SPX29500 1) VIN 2)GND 3) VOUT
SPX29501 1) ENABLE 2)INPUT 3) GND 4) OUTPUT 5) FLAG
SPX29502 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
SPX29503 1) FLAG 2)INPUT 3) GND 4) OUTPUT 5) ADJUST
GND VIN V OUT Front View
1 2 34 5 Top View
*Tab is internally connected to GND
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
6
PACKAGES: 5 PIN TO-263
Rev:B
Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
7
PACKAGES: 5 PIN TO-220
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
(c) Copyright 2008 Exar Corporation
8
ORDERING INFORMATION
PART NUMBER ACCURACY OUTPUT VOLTAGE PACKAGE
SPX29500U-L-1-8 ...................EOL SPX29500U-L-2-5 ...................EOL SPX29500U-L-3-3 ...................EOL SPX29500U-L-5-0 ...................EOL SPX29500T-L-1-8 ...................EOL SPX29500T-L-2-5 ...................EOL SPX29500T-L-3-3 ...................EOL SPX29500T-L-5-0 ...................EOL SPX29501U5-L-1-8 .................EOL SPX29501U5-L-2-5 .................EOL SPX29501U5-L-3-3 .................EOL SPX29501U5-L-5-0 .................EOL SPX29501T5-L-1-8 ................. 1.0% ................................... 1.8V ............................ 5 lead TO-263 SPX29501T5-L-2-5 ................. 1.0% ................................... 2.5V ............................ 5 lead TO-263 SPX29501T5-L-3-3 ................. 1.0% ................................... 3.3V ............................ 5 lead TO-263 SPX29501T5-L-5-0 ................. 1.0% ................................... 5.0V ............................ 5 lead TO-263 SPX29502T5-L ........................ 1.0% .................................... Adj .............................. 5 lead TO-263 SPX29502U5-L ....................... 1.0% .................................... Adj .............................. 5 lead TO-220 SPX29503T5-L ........................EOL SPX29503U5-L .......................EOL
Please consult the factory for pricing and availability on a Tape-On-Reel option.
FOR FURTHER ASSISTANCE
Email: Exar Technical Documentation: customersupport@exar.com http://www.exar.com/TechDoc/default.aspx?
EXAR CORPORATION HEADQUARTERS AND SALES OFFICES
48720 Kato Road Fremont, CA 94538 - USA
pex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com
NOTICE Sales Office
22 Linnell Circle EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve Billerica, MA 01821 design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, TEL: (978) 667-8700 conveys no license under any patent or other right, and makes no representation that the circuits are free of patent FAX: (978) 670-9001 infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a e-mail: sales@sipex.com user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) to any products described herein. Sipex does not assume any liability arising assumes Sipex Corporation reserves the right to make changes the risk of injury or damage has been minimized; (b) the user out of the such risks;or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. application (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Rev:B Nov 2008 SPX29500/01/02/03 5A Low Dropout Voltage Regulator
or its in all
(c) Copyright 2008 Exar Corporation
9

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