View SPX29302A_46882.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
SPX29302A
Adjustable, Fast Response Time
3A High Current, Low Dropout Voltage Regulator
FEATURES Adjustable Output Down To 1.25V 1% Output Accuracy Output Current of 3A Low Dropout Voltage of 370mV @ 3A Extremely Fast Transient Response Reverse-Battery Protection Zero Current Shutdown (5 pin version) Standard TO-220 and TO-263 Packages
APPLICATIONS Powering VGA & Sound Card PowerPCTM Supplies SMPS Post Regulator High Efficiency "Green" Computer Systems High Efficiency Linear Power Supplies Constant Current Regulators Adjustable Power Supplies Battery Charger Refer to page 7 for pinouts. Now Available in Lead Free Packaging DESCRIPTION
The SPX29302A is a 3A, highly accurate voltage regulator with a low drop out voltage of 370mV (typical) @ 3A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. Fault protection features include over-current, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy. The SPX29302A is offered in 5-pin TO-220 & TO-263 packages. TYPICAL APPLICATION S CIRCUIT
1 SPX29302A 4 + 2 GND 3 5 ADJ + R1 V OUT 10F
V IN 6.8F
R2
Figure 1. Adjustable Output Linear Regulator
Date: 5/25/04
SPX29302A 3Amp LDO Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
1
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 7) .................................................... 16V
ELECTRICAL CHARACTERISTICS
(Note 1) at VIN=VOUT + 1V and IOUT = 10mA, CIN = 6.8F, COUT = 10F, Tj = 25C, unless otherwise specified. The Boldface applies over the junction temperature range. SPX29302A PARAMETER CONDITIONS TYP MIN MAX UNITS Line Regulation Load Regulation V/T Dropout Voltage, except 1.8V, (Note 3) Ground Current (Note 5) 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. ENABLE Input Input Logic Voltage Low (OFF) High (ON) ENABLE Input Pin IOUT=10mA,(VOUT+1V) VIN 16V VIN=VOUT+5V, 10mA IOUT IFL (Note 2) VOUT Temp Coefficient (Note 6) IOUT=100mA IOUT=1.5A IOUT=3.0A IOUT=1.5A, VIN=VOUT+1V IOUT=3.0A VIN=0.5V less than specified VOUT, IOUT=10mA VOUT=0V (Note 4) CL=10F CL=33F 0.06 0.2 20 50 250 370 10 37 1.7 4.0 400 260 1.240 0.5 1 100 175 600 35 % % ppm/C mV
mA mA
5.0
A VRMS VMAX V nA ppm/C nA/C
(Note 8) 40 (Note 7) 20 0.1
1.228 1.215 1.203
1.252 1.265 1.277 80 120
VIN<10V 2.4 VEN=16V VEN=0.8V 100
0.8 600 750 1 2 500
V A A A C/W
Regulator Output Current in Shutdown Thermal Resistance
(Note 10) TO-220 Junction to Case, at Tab TO-220 Junction to Ambient TO-263 Junction to Case, at Tab TO-263 Junction to Ambient
10 2 60 2 60
NOTES: Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100msecond) < 1% and duty cycle of less than 1%. The maximum continuous supply voltage is 16V. Note 2: Full load current (IFL) is defined as 3.0A. Note 3: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its nominal value. Note 4: VIN = VOUT (NOMINAL) +1V. For example, use VIN = 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current. Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 7: 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 = 16V (a 4W pulse) for t = 10ms. Note 8: VREF VOUT (VIN-1), 2.3VVIN 16V, 10mA IL IFL, Tj Tjmax. Note 9: 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 = 38mV. 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 10: VEN 0.8V and VIN 16V, VOUT = 0. Date: 5/25/04 SPX29302A 3Amp LDO Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
2
BLOCK DIAGRAM
IN O.V I LIMIT FLAG + 1.180V Reference 1.240V + ADJ EN Thermal Shutdown 28V R1* OUT
R2*
GND
TYPICAL PERFORMANCE CHARACTERISTICS
1200
2.540
1000
Vdropout (mV)
2.530 2.520
Vout (V)
800 600 85C 400 25C 200 0 0 1.0 IL (A) 2.0 3.0 VOUT=3.3V CL = 10F Vin = 3.2V
2.510 2.500 2.490 2.480 2.470 2.460 4 6 8 10 Vin (V) 12 14 16 VOUT=2.5V IL = 10mA CL = 10F
Figure 2. Dropout Voltage vs Load Current
80.0
Figure 3. Line Regulation
3.310
70.0 60.0 50.0
3.305
85C 25C
Ignd (mA)
40.0 30.0 20.0 10.0 0.0 0 1.0 IL (A) 2.0 3.0 VOUT=3.3V Vin = 4.3V CL = 10F
Vout (V )
3.300 3.295 3.290 3.285 3.280 0 1.0 IL (A) 2.0 3.0 VOUT=3.3V VIN = 4.3V CL = 10F
Figure 4. Ground Current vs Load Current
1.9 1.8 1.7
Vth (V)
Figure 5. Load Regulation
1.6 1.5 1.4 1.3 1.2 -40
VOUT=3.3V
-20
0
20 40 60 Temperature ( o C)
80
100
120
Figure 6. Enable Threshold vs Temperature
Date: 5/25/04 SPX29302A 3Amp LDO Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
3
APPLICATION INFORMATION The SPX29302A incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX29302A 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: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50C, HA= 1C/W, CH= 2C/W, and JC= 3C/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 = 7.5W. And the junction temperature is calculated as TJ = TA + PD * (HA + CH + JC) or TJ = 50 + 7.5 * (1+2+3) = 95C Reliable operation is insured below 125C. Capacitor Requirements 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 10F aluminum capacitor will guarantee stability over all load conditions. A tantalum capacitor is recommended if a faster 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 To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX29302A is required. Adjustable Regulator Design The SPX29302A are adjustable regulators that can be programmed to any value between 1.25V and 16V using 2 resistors, R1 and R2. The relationship between the resistors is: R1 = R2(VOUT/1.240-1). Enable Input The SPX29302A has an Enable function that switches the regulator on and off. Its thresholds is TTL compatible. When the regulator is active, approximately 20 uA flows through the Enable pin. Typical Application Circuits Figure 1 represents an adjustable output linear 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 be small enough to pass a minimum regulator load current of 5 mA. A minimum value of 10kohms is recommended for R2 with a range between 10kohms and 47 kohms.
Date: 5/25/04
SPX29302A 3Amp LDO Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
4
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: 5/25/04
SPX29302A 3Amp LDO Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
5
PACKAGE: 5 PIN TO-220
E E/2
A B SEATING PLANE
A
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: 5/25/04
SPX29302A 3Amp LDO Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
6
PACKAGE: PINOUTS
TO-263-5 Package (T5)
1 2345
SPX29302A 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
Top View
TO-220-5 Package (U5)
SPX29302A 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST 1 2 34 5 Top View
*Tab is internally connected to GND
ORDERING INFORMATION
PART NUMBER
ACCURACY
TOP MARK
OUTPUT VOLTAGE
PACKAGE
SPX29302AT5 SPX29302AT5/TR SPX29302AU5
1.0% 1.0% 1.0%
29302AT5YYWW 29302AT5YYWW 29302AU5YYWW
Adj Adj Adj
5 lead TO-263 5 lead TO-263 5 lead TO-220
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX29302A/TR = standard; SP6685ER-L/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: 5/25/04 SPX29302A 3Amp LDO Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
7

▲Up To Search▲

Price & Availability of SPX29302A

	To Download SPX29302A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .