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Solved by
SPX1587
TM
3A Low Dropout Voltage Regulator
FEATURES
Guaranteed 3A Output Current Three Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 3.3V and 5.0V Low Quiescent Current Low Dropout Voltage: 1.1V at 3A Line Regulation: 0.1% Load Regulation: 0.1% Stable with 10uF Ceramic Capacitor Overcurrent and Thermal Protection Similar to Industry Standard LT1085/ LT1585 Available in RoHS Compliant, Lead Free Packages: TO-252, TO-220, and TO-263
SPX1587
3 Pin TO-263
SPX1587
3 Pin TO-220
1
2
3
1
2
3
ADJ/GND VOUT
VIN
ADJ/GND VOUT VIN
APPLICATIONS

Desktop PC's Servers Powering VGA and Sound Cards Cordless Phones Battery Chargers Adjustable Power Supplies Portable Instrumentation SMPS Post-Regulator
The SPX1587 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered applications and portable computers. The SPX1587 features very low quiescent current and a low dropout voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX1587 is available in adjustable or fixed 1.5V, 1.8V, 2.5V, 3.3V and 5.0V output voltages. The SPX1587 is offered in several 3-pin surface mount packages: TO-252, TO-220 and TO-263. An output capacitor of 10F ceramic or tantalum provides unconditional stability.
DESCRIPTION
FUNCTIONAL DIAGRAM (Adjustable)
VIN
Current Limit
+ VOUT ICL _ AMP + 1.25V
Thermal Limit
+ -
VREF ADJ/GND IADJ ~ 50A -
(c) 2007 Sipex Corporation
Jun8-07 Rev D
I TL SPX587 Low-Dropout Voltage Regulator
Power Dissipation.......................................Internally Limited Lead Temperature (soldering, 5 seconds) ................ 260C Storage Temperature Range.......................-65C to +150C
Operating Junction Temperature Range.....-40C to +125C Input Supply Voltage .................................................... +10V Input to Output Voltage ................................................ +8.8V ESD Rating .............................................................. 2kV min
ABSOLUTE MAXIMUM RATINGS
Specifications are at VIN=VOUT + 1.5V, TA = 25C, CIN = COUT = 10F, IOUT =10mA, unless otherwise specified. The the specifications which apply full operating temperature range -40C to +85C, unless otherwise specified.
PARAMETER 1.5V Version Output Voltage 1.8V Version Output Voltage 2.5V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Reference Voltage Output Voltage Temperature Stability Line Regulation 1.238 1.225 1.250 0.3 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1.00 1.05 1.10 4 4 50 3.2 60 5 0.01 75 0.03 0.003 3 29.4 3 31.4 6 50 0.1 60 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 1.2 10 10 120 3.2 1.262 1.275 1.225 1.212 1.250 0.5 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1.00 1.05 1.10 4 4 50 5 0.01 75 0.03 0.003 3 29.4 3 31.4 6 50 0.1 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 1.2 10 10 120 A %/W dB % % C/W (VIN-VOUT)=2V 25C, 30mS pulse mA mA A Fixed voltage versions 1.275 1.287 V % % 3.0V VIN 10V,VOUT=1.5V 3.3V VIN 10V,VOUT=1.8V 4.25V VIN 10V,VOUT=2.5V 4.75V VIN 10V,VOUT=3.3V 6.50V VIN 10V,VOUT=5.0V 10mA 10mA 10mA 10mA 10mA IOUT IOUT IOUT IOUT IOUT 3A, VOUT=1.5V 3A, VOUT=1.8V 3A, VOUT=2.5V 3A, VOUT=3.3V 3A, VOUT=5.0V 4.950 4.900 5.000 5.050 5.100 4.900 4.850 5.000 5.100 5.150 V 3.267 3.234 3.300 3.333 3.366 3.234 3.201 3.300 3.366 3.399 V 2.475 2.450 2.500 2.525 2.550 2.450 2.425 2.500 2.550 2.575 V 1.782 1.764 1.800 1.818 1.836 1.764 1.746 1.800 1.836 1.854 V 1.485 1.470 MIN TYP SPX1587A 1.500 1.515 1.530 1.470 1.455 MAX MIN TYP SPX1587 1.500 1.530 1.545 V MAX UNITS CONDITIONS
ELECTRICAL CHARACTERISTICS
denotes
IOUT = 10mA, VIN =3.5V 10mA I OUT 3A, 3.0V V IN 10V IOUT = 10mA, VIN =3.8V 10mA I OUT 3A, 3.3V V IN 10V IOUT = 10mA, VIN =4.5V 10mA I OUT 3A, 4.25V V IN 10V IOUT = 10mA, VIN =5V 10mA I OUT 3A, 4.75V V IN 10V IOUT=10mA, VIN=7V 10mA I OUT 3A, 6.50V V IN 10V IOUT=10mA, (VIN - VOUT )= 2V 10mA IOUT 3A, 1.5V (VIN-VOUT) 10V
Load Regulation
%
Dropout Voltage (Note 2) Minimum Load Current (Note 4) Quiescent Current Adjust Pin Current Current Limit Thermal Regulation Ripple Rejection Long Term Stability RMS Output Noise Thermal Resistance
V
IOUT=1A IOUT=2A IOUT=3A
FRIPPLE=120Hz, (VIN-VOUT)=2V, VRIPPLE=1VPP 125C, 1000Hrs % of VOUT, 10Hz f 10kHz TO-220 Junction to Case, at Tab TO-220 Junction to Ambient TO-263 Junction to Case, at Tab TO-263 Junction to Ambient TO-252 Junction to Case, at Tab TO-252 Junction to Ambient
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
(c) 2007 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS: Continued (Notes)
NOTES: Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 3: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied. excluding load or line regulation effect. Note 4: Adjustable Version Only.
TYPICAL PERFORMANCE CHARACTERISTICS
3.325
1.275 1.27
1.25v Adj
3.320
1.265 1.26
Vout (V)
Vout (V)
3.315
1.255 1.25 1.245 1.24
3.310
3.305
1.235 1.23
3.300 4.5 6.5 8.5 10.5 Vin (V) 12.5 14.5
1.225 -50
-30
-10
10
30
Temp (C)
50
70
90
110
130
Figure 1. Line Regulation for SPX1587U-3.3; IOUT=10mA
Figure 2. VOUTvs Temperature, V IN=2.5V, IOUT=10mA
2.55 2.54 2.53
Vout (V)
3.38 2.5v Adj 2.5v Fixed 3.36 3.34 3.32 3.3 3.28 3.26 -50 3.3v Adj 3.3v Fixed
2.52
Vout (V)
2.51 2.5 2.49 2.48 2.47 2.46 2.45 -50 -30 -10 10 30 50 70 90 110 130
-30
-10
10
30
50
70
90
110 130
Temp (C)
Temp (C)
Figure 3. VIN=4.0V, IOUT=10mA
Jun8-07 Rev D
Figure 4. VIN=5.0V, IOUT=10mA
SPX587 Low-Dropout Voltage Regulator (c) 2007 Sipex Corporation
APPLICATION INFORMATION
Output Capacitor To ensure the stability of the SPX1587, an output capacitor of at least 10F (ceramic or tantalum) or 22F (aluminum) is required. The value may change based on the application requirements of the output load or temperature range. The value of ESR can vary based on the type of capacitor used in the applications to guarantee stability. The recommended value for ESR is 0.5 or less. A larger value of output capacitance (up to 100F) can improve the load transient response. Soldering Methods The SPX1587 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. Thermal Characteristics The SPX1587 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continuous load conditions such that the maximum junction temperature does not exceed 125C. Thermal protection is activated at >179C and deactiviated at <165 C. The thermal interaction from other components in the application can effect the thermal resistance of the SPX1587. The actual thermal resistance can be determined with experimentation. SPX1587 power dissipation is calculated as follows: PD= (V IN- V OUT)(IOUT) Maximum Junction Temperature range: TJ= T A(max) + PD* JA (junction-to-ambient thermal resistance) Maximum junction temperature must not exceed 125C. Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure 8. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum. If the ADJ pin is not bypassed, the value of the output capacitor can be lowered to 22F for an electrolytic aluminum capacitor or 10F for a solid tantalum capacitor (Fig 7). where VREF=1.25V Layout Considerations Parasitic line resistance can degrade load regulation. In order to avoid this, connect R1 directly to VOUT as illustrated in Figure 13. For the same reason, R2 should be connected to the negative side of the load.
(c) 2007 Sipex Corporation
However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: C = 1 / ( 6.28 * FR* R 1) Where C = value of the capacitor in Farads (select an equal or larger standard value), FR= ripple frequency in Hz, R1= value of resistor R1 in Ohms. If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent of the output voltage. If an ADJ-bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: M = VOUT / VREF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. VREF=1.25V Ripple rejection for the adjustable version is shown in Figure 5. Output Voltage The output of the adjustable regulator can be set to any voltage between 1.25V and 15V. The value of VOUT can be quickly approximated using the formula VOUT=1.25 *(R1+ R 2)/R1 A small correction to this formula is required depending on the values of resistors R1 and R2, since the adjustable pin current (approx 50A) flows through R2. When IADJ is taken into account, the formula becomes VOUT= V REF(1+ (R2/R1)) + IADJ* R 2
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
APPLICATION INFORMATION: Continued
0 -10 -20
Ripple Rejection, Db
-30 -40 -50 -60 -70 -80 -90 10
V IN 4.7F + C1
IN
SPX1587
ADJ
OUT C2 R1 IOUT LOAD
VOUT
IOUT=
VREF R1
100
1000
10000
100000
1000000
Frequency, Hz
Figure 5. Ripple Rejection; Vin=3.3V, Vout=1.8V (adj.), Iload=200mA
Figure 6. Current Source
(Note A) V IN
SPX1587
IN OUT ADJ
5V
VIN 4.7F + C1
IN
SPX1587
ADJ I ADJ 50A
2
OUT VREF R 1
VOUT C2
4.7F
+ R1 330 1%
VOUT
10F
VOUT = V REF (1+R 2 /R1 ) +I ADJR
R2
*C 1 improves ripple rejection. ZCshould be ~ R1 at ripple frequency
R2 1k , 1%
+
C1 10F*
Note A: VIN(MIN) = (Intended VOUT ) + (V
) DROPOUT (MAX)
Figure 7. Typical Adjustable Regulator
Figure 8. Improving Ripple Rejection
VIN (Note A) + 4.7F
1k
SPX1587
IN ADJ OUT
330
5V
VIN ADJ
R PParasitic Line Resistance SPX1587
VOUT
1%
+
10F
TTL Input
2N3904
1k
Connect R to Case of Regulator R 1 Connect R2 to Load R2 RL
1k
1%
Note A: VIN(MIN)= (Intended V OUT ) + (V ) DROPOUT (MAX)
Figure 9. 5V Regulator with Shutdown
Jun8-07 Rev D
Figure 10. Recommended Connections for Best Results
SPX587 Low-Dropout Voltage Regulator (c) 2007 Sipex Corporation
5
PINOUTS
Note that TAB is connected to VOUTfor all 3 package types.
TO-252 (R)
TO-220-3 (U)
TO-263-3 (T)
1
2
3 1 2 3
1
2
3
ADJ/GND
V
OUT
V IN ADJ/GND V OUT V IN
Front View
ADJ/GND
V OUT
V IN
Top View
Front View
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
(c) 2007 Sipex Corporation
PAckAge: 3 Pin T0-252
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
(c) 2007 Sipex Corporation
7
PAckAge: 3 Pin T0-220
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
(c) 2007 Sipex Corporation
8
PAckAge: 3 Pin T0-263
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator
(c) 2007 Sipex Corporation
ORDeRing inFORMATiOn PART NUMBER Accuracy OUTPUT VOLTAGE PACKAGE
SPX587AR ................... % ............................. Adj .................................... lead TO-252 SPX587AR/TR ............. % ............................. Adj ................................... lead TO-252 SPX587AR--5 ............. % ............................ .5V ................................. lead TO-252 SPX587AR--5/TR ....... % ............................ .5V ................................. lead TO-252 SPX587AR--8 ............. % ............................ .8V ................................. lead TO-252 SPX587AR--8/TR ....... % ............................ .8V ................................. lead TO-252 SPX587AR-2-5 ............. % ............................ 2.5V ................................. lead TO-252 SPX587AR-2-5/TR ....... % ............................ 2.5V ................................. lead TO-252 SPX587AR-- ............. % ............................ .V ................................. lead TO-252 SPX587AR--/TR ....... % ............................ .V ................................. lead TO-252 SPX587AR-5-0 ............. % ............................ 5.0V ................................. lead TO-252 SPX587AR-5-0/TR ....... % ............................ 5.0V ................................. lead TO-252 SPX587AT .................... % ............................. Adj ................................... lead TO-2 SPX587AT/TR .............. % ............................. Adj ................................... lead TO-2 SPX587AT--5 ............. % ............................ .5V .................................. lead TO-2 SPX587AT--5/TR ....... % ............................ .5V .................................. lead TO-2 SPX587AT--8 ............. % ............................ .8V .................................. lead TO-2 SPX587AT--8/TR ....... % ............................ .8V .................................. lead TO-2 SPX587AT-2-5 ............. % ............................ 2.5V .................................. lead TO-2 SPX587AT-2-5/TR ....... % ............................ 2.5V .................................. lead TO-2 SPX587AT-- ............. % ............................ .V .................................. lead TO-2 SPX587AT--/TR ....... % ............................ .V .................................. lead TO-2 SPX587AT-5-0 ............. % ............................ 5.0V .................................. lead TO-2 SPX587AT-5-0/TR ....... % ............................ 5.0V .................................. lead TO-2 SPX587AU ................... % ............................. Adj ................................... lead TO-220 SPX587AU--5 ............. % ............................ .5V ................................. lead TO-220 SPX587AU--8 ............. % ............................ .8V ................................. lead TO-220 SPX587AU-2-5 ............. % ............................ 2.5V ................................. lead TO-220 SPX587AU-- ............. % ............................ .V ................................. lead TO-220 SPX587AU-5-0 ............. % ............................ 5.0V ................................. lead TO-220 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX587AU-5-0/TR = standard; SPX587AU-L-5-0/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-2 and 2,000 for TO-252. For status updates, http://www.sipex.com/productDetails.aspx?varpart=SPX587AR-L
Solved by
Sipex corporation
TM
Headquarters and Sales Office 2 South Hillview Drive Milpitas, CA 505 TEL: (08) -7500 FAX: (08) 5-700
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. Jun8-07 Rev D SPX587 Low-Dropout Voltage Regulator (c) 2007 Sipex Corporation
0
ORDeRing inFORMATiOn PART NUMBER Accuracy OUTPUT VOLTAGE PACKAGE lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-252 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-2 TO-220 TO-220 TO-220 TO-220 TO-220 TO-220
SPX587R ...................... 2% ........................... Adj .................................. SPX587R/TR ................ 2% ........................... Adj ................................... SPX587R--5 ............... 2% .......................... .5V ................................. SPX587R--5/TR ......... 2% .......................... .5V ................................. SPX587R--8 ............... 2% .......................... .8V ................................. SPX587R--8/TR ......... 2% .......................... .8V ................................. SPX587R-2-5 ............... 2% .......................... 2.5V ................................. SPX587R-2-5/TR ......... 2% .......................... 2.5V ................................. SPX587R-2-8 ............... 2% .......................... 2.8V ................................. SPX587R-2-8/TR ......... 2% .......................... 2.8V ................................. SPX587R-2-85 ............. 2% ......................... 2.85V ................................. SPX587R-2-85/TR ....... 2% ......................... 2.85V ................................. SPX587R-- ............... 2% .......................... .V ................................. SPX587R--/TR ......... 2% .......................... .V ................................. SPX587R-5-0 ............... 2% .......................... 5.0V ................................. SPX587R-5-0/TR ......... 2% .......................... 5.0V ................................. SPX587T ...................... 2% ........................... Adj ................................... SPX587T/TR ................ 2% ........................... Adj ................................... SPX587T--5 ................ 2% .......................... .5V ................................. SPX587T--5/TR .......... 2% .......................... .5V ................................. SPX587T--8 ................ 2% .......................... .8V ................................. SPX587T--8/TR .......... 2% .......................... .8V ................................. SPX587T-2-5 ................ 2% .......................... 2.5V ................................. SPX587T-2-5/TR .......... 2% .......................... 2.5V ................................. SPX587T-- ................ 2% .......................... .V ................................. SPX587T--/TR .......... 2% .......................... .V ................................. SPX587T-5-0 ................ 2% .......................... 5.0V ................................. SPX587T-5-0/TR .......... 2% .......................... 5.0V ................................. SPX587U ...................... 2% ........................... Adj ................................... SPX587U--5 ............... 2% .......................... .5V ................................. SPX587U--8 ............... 2% .......................... .8V ................................. SPX587U-2-5 ............... 2% .......................... 2.5V ................................. SPX587U-- ............... 2% .......................... .V ................................. SPX587U-5-0 ............... 2% .......................... 5.0V .................................
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX587T-5.0/TR = standard; SPX587T-L-5.0/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-2 and 2,000 for TO-252. For status updates, http://www.sipex.com/productDetails.aspx?varpart=SPX587AR-L .
Solved by
Sipex corporation Headquarters and Sales Office 2 South Hillview Drive Milpitas, CA 505 TEL: (08) -7500 FAX: (08) 5-700 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. (c) 2007 Sipex Corporation
TM
Jun8-07 Rev D
SPX587 Low-Dropout Voltage Regulator

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