Adjustable Output B1587 Description Linear B1587 Monoli

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Adjustable Output B1587 Description Linear B1587 Monoli

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4.0A Dropout Voltage Regulator
Adjustable Output
B1587
Description
Linear B1587 Monolithic power 4.0A Adjustable fixed voltage regulator that easy with minimum external components. suitable applications requiring well-regulated positive output voltage with input-output differential voltage requirements output voltage 1.5V, 2.5V, 3.0V, 3.3V, B1587 Outstanding features include full power usage 4.0Amp load current internal current limiting thermal shutdown. Other fixed versions also available consult with factory. B1587 offer LPDD (Low Profile TO263) package from 4.47 (DD) thickness down only 1.27 (LPDD) total thickness. B1587 offered 3-pin TO-220, TO-263 TO-252 packages compatible with other terminal regulators. dropout Regulator refer B1585 data sheet.
Features
Adjustable Output Down 1.2V Fixed Output Voltages 2.5V, 3.0V 3.3V, 5.0V Output Current 4.0A Dropout Voltage 1.1V Typ. Current Thermal Limiting Standard 3-Terminal Cost TO-220, Packages Similar industry Standard LT1085/LT1587/LT1585
Applications
3.3V 2.5V Pentium Processor SMPS Post Regulator High Efficiency "Green" Computer Systems High Efficiency Linear Power Supplies 3.XXV Pentium Processor Battery Charger
Connection
Ordering Information
Devices
B1587T B1587S B1587D B1587J
TO-263-3
Package
TO-220 TO-263 TO-252 LPDD
Temp.
TO-252
ADJ/
View
Front View
LPDD
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
Absolute Maximum Rating
Parameter
Maximum Input Voltage Power Dissipation Thermal Resistance Junction Case Thermal Resistance Junction Ambient Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Range Lead Temperature (Soldering Sec.)
Symbol
Value
Internally Limited
Unit
°C/W
TSTG TLEAD
Electrical Characteristics
(VIN 4.75V 5.25V; 10mA 4.0Amp, unless otherwise specified) Parameter Symbol Conditions
Output Voltage 0<IOUT<4A, 3.3V<VIN<7V, 0<IOUT<4A, 3.3V<VIN<7V, Over Temp. 0<IOUT<4A, 4.0V<VIN<7V, 0<IOUT<4A, 4.0V<VIN<7V, Over Temp. 0<IOUT<4A, 4.5V<VIN<7V, 0<IOUT<4A, 4.5V<VIN<7V, Over Temp. 0<IOUT<4A, 4.8V<VIN<7V, 0<IOUT<4A, 4.8V<VIN<7V, Over Temp. 0<IOUT<4A, 6.5V<VIN<7V, 0<IOUT<4A, 6.5V<VIN<7V, Over Temp. VIN<7V, 1.5V<VIN<5.75, 10Ma<Iout<4Amp 10mA, =5V, 10mA, =5V, IOUT=3A IOUT=4A (Vin-Vout)=3V 10mA, 30ms pulse TO-220 Junction Junction Ambient Package Junction Junction Ambient
1.485 1.475 2.475 2.460 2.970 2.950 3.267 3.247 4.950 4.920 1.238 1.230
1.250 0.04 0.08 0.003
1.515 1.525 2.525 2.540 3.030 3.050 3.333 3.353 5.050 5.080 1.262 1.270 0.40
UNIT
Reference Voltage Line Regulation Load Regulation Dropout Voltage Minimum load Current Current Limit Ground Current Temperature Stability Thermal Regulation Ripple Rejection Thermal Resistance
Vref (line) (LOAD) Imin
°C/W
Note: Output Switch tests performed under pulsed conditions minimize power dissipation
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
APPLICATION HINTS
Linear B1587 incorporates protection against over-current faults, reversed load insertion, over temperature operation, positive negative transient voltage. However, output capacitor required order insure stability performances. Stability output capacitor part regulator's frequency compensation system. Either 220µF aluminum electrolytic capacitor 47µF solid tantalum capacitor between output terminal ground guarantees stable operation operating conditions. However, order minimize overshoot undershoot, therefore optimize design, please refer section `Ripple Rejection'. Ripple Rejection Ripple rejection improved adding capacitor between ground. When bypassing used, value output capacitor required increases maximum (220µF aluminum electrolytic capacitor, 47µF solid tantalum capacitor). bypass, value output capacitor lowered 100µF electrolytic aluminum capacitor 15µF solid tantalum capacitor. However value ADJ-bypass capacitor should chosen with respect following equation: 6.28 Where value capacitor Farads (select equal larger standard value), ripple frequency value resistor Ohms. ADJ-bypass capacitor use, amplitude output ripple will independent output voltage. ADJ-bypass capacitor used, output ripple will proportional ratio output voltage reference voltage: VOUT VREF Where multiplier ripple seen when optimally bypassed. VREF Reference Voltage
Reducing parasitic resistance inductance solution minimize parasitic resistance inductance connect parallel capacitors. This arrangement will improve transient response power supply your system requires rapidly changing current load condition. Thermal Consideration Although B1587 offers some limiting circuitry overload conditions, necessary exceed maximum junction temperature, therefore careful about thermal resistance. heat flow will follow lowest resistance path, which Junction-to-case thermal resistance. order insure best thermal flow component, proper mounting required. Note that case device electrically connected output. case case electrically isolated, thermally conductive spacer used. However forget consider contribution thermal resistance. Assuming: 10V, VOUT IOUT 90°C, CASE= 1°C/W external heat sink, wind) Power dissipation under these conditions (VIN VOUT) IOUT Junction Temperature (CASE+ Control Section 90°C 15W*(1°C/W 0.6°C/W) 114°C 114°C TJUNCTION control section. Power Section 90°C 15W*(1°C/W 1.6°C/W) 129°C 129°C TJUNCTION power transistor. both case reliable operation insured adequate junction temperature.
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
Basic Adjustable Regulator
B1587
This current will through resistance overall output voltage. current IADJ very small constant. Therefore contribution overall output voltage very small generally ignored
Load Regulation
50µA
VOUT R2/R1) IADJ
Fig.2 Basic Adjustable Regulator
Parasitic line resistance degrade load regulation. order affect behavior regulator, best connect directly resistance from resistor divider case, load. same reason, best connect resistor Negative side load.
Output Voltage Output Voltage
Output Voltage
Consider Figure resistance generates constant current flow, normally specified load current 10mA
VOUT
B1587
Parasitic Line Resistance
Connect Case Regulator
Connect Load
Fig.3 Basic Adjustable Regulator
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
B1587
B1587
VOUT
LOAD
VOUT VREF IADJ
Fig.4 Current Output Regulator
Typical Adjustable Regulator
(Note
10µF
B1587
VOUT
150µF
(Note
B1587
10µF Output 2N3904
100µF
improves ripple rejection. should ripple frequency. Note (MIN) Intended VOUT DROPOUT (MAX)
10µF*
Note (MIN) Intended VOUT DROPOUT (MAX)
Fig.
Improving Ripple Rejection
Fig.7
Regulator with Shutdown
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
TYPICAL CHARACTERISTICS
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
-AL2
SEATING PLANE
PLCS
.010
NOTES
TERM
Refer Applicable Symbol List. Dimensions Tolerancing Ansi Y14.5m 1982. Lead Dimension Uncontrolled Contour Optional Within Dim. Establishes Minimum Mounting Surface Terminal Termal Length Soldering. Controlling Dimension: Inch Mils Suggested Postive Contact Mounting.
BACK VIEW
INCHES 0.086 0.035 0.025 0.300 0.205 0.018 0.018 0.235 0.170 0.250 0.170 0.098 0.180 0.370 0.020 0.025 0.035 0.045 0.410 0.040 0.050 0.060 9.398 0.508 0.635 0.889 1.143 0.094 0.045 0.035 0.045 0.215 0.023 0.023 0.245 0.265 2.184 0.889 0.635 7.620 5.207 0.457 0.457 5.969 4.318 6.350 4.318
2.3876 1.143 0.889 1.143 5.461 0.5842 0.5842 6.223 6.731 2.489 4.572 10.414 1.016 1.270 1.524
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1587
0.405 (10.287
0.005 0.127)
0.055 (1.397)
0.176 0.005 (4.470 0.050 0.002 (1.270
0.127) 0.051)
0.356 (9.042
0.005 0.127) 0.600 0.025 (15.24 0.635) 0.100 0.010 (2.540 0.254)
0.103 (2.616)
0.050 (1.270) 0.032 0.001 (0.813 0.025)
0.015 (0.381
0.003 0.074)
Advance Information- These data sheets contain descriptions products that development. specifications based engineering calculations, computer simulations and/ initial prototype evaluation. Preliminary Information- These data sheets contain minimum maximum specifications that based initial device characterizations. These limits subject change upon completion full characterization over specified temperature supply voltage ranges.
application circuit examples only explain representative applications devices intended guarantee circuit design permit industrial property right other rights execute. Linear takes responsibility problems related industrial property right resulting from contents shown data book. Typical parameters vary different applications. Customer's technical experts must validate operating parameters including Typical" each customer application.
LIFE SUPPORT NUCLEAR POLICY Linear products authorized should used within life support systems which intended surgical implants into body support sustain life, aircraft, space equipment, submarine, nuclear facility applications without specific written consent Linear President.
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

Adjustable Output B1587 Description Linear B1587 Monoli

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