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Part: B1581S-1.5
Category:
Description: 1.5V 5.0A Low Dropout Voltage Regulator
Company: Bay Linear
Datasheet: Download B1581S-1.5 datasheet File size : 251 kB
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Datasheet text preview:
Bay Bay Linear
Inspire Inspire the Linear Power
5.0A Low Dropout Voltage Regulator
Adjustable & Fix Output
B1581
Description
The Bay Linear B1581 is Monolithic low power 5.0A Adjustable and fixed NPN voltage regulator that are easy to use with minimum external components. It is suitable for applications requiring a well-regulated positive output voltage with low input-output differential voltage requirements and output voltage 1.5V, 2.5V, 3.0V, 3.3V, or 5V. The B1581 Outstanding features include full power usage up to 5.0Amp of load current internal current limiting and thermal shutdown. Other fixed versions are also available consult with factory. The B1581 is offered in a 5-pin TO-220, & TO-263 packages compatible with other 5 terminal regulators. For 5A Low dropout Regulator refer to the B1581 data sheet.
Features
· · · · · · Adjustable Output Down to 1.2V Fixed Output Voltages 2.5V, 3.0V 3.3V, and 5.0V Output Current of 5.0A Low Dropout Voltage 700mV Typ. Current & Thermal Limiting Standard 3-Terminal Low Cost TO-220, D2 Packages Similar to industry Standard EZ1581/CS5205
·
Applications
· · · · · · 3.3V to 2.5V for Pentium Processor SMPS Post Regulator High Efficiency "Green" Computer Systems High Efficiency Linear Power Supplies 5V to 3.XXV fro Pentium Processor Battery Charger
Pin Connection
Ordering Information
Devices
B1581T B1581S
Package
TO-220 TO-263
Temp.
0 °C to 70 °C 0 °C to 70 °C
5 4 3 2 1
VPOWER VCONTROL OUTPUT ADJ/GND. SENSE
TO-263-5 Package
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1581
Absolute Maximum Rating
Parameter
Maximum Input Voltage Power Dissipation Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Range Lead Temperature (Soldering 10 Sec.)
Symbol
V IN PO JC JA TJ
Value
7 Internally Limited 3 50
Unit
V W °C/W °C
TSTG TLEAD
0 to 125 0 to 150 -65 to 150 260
Electrical Characteristics
(VIN = 4.75V to 5.25V; IO = 10mA to 5.0Amp, unless otherwise specified) Parameter Symbol Conditions
Output Voltage VO VCONT=4V, VPWR=2V VCONT=3V, VPWR=2.3V, ILOAD=10mA to 5A VCONT=5V, VPWR=3.3V VCONT=4V, VPWR=3.3V, ILOAD=10mA to 5A VCONT=5.5V, VPWR=3.5V VCONT=4.5V, VPWR=3.8V, ILOAD=10mA - 5A VCONT=5.8V, VPWR=3.8V VCONT=4.8V, VPWR=4.1V, ILOAD=10mA - 5A VCONT=7.5V, VPWR=5.5V VCONT=6.5V, VPWR=5.8V, ILOAD=10mA- 5A VCONT=2.75V, VPWR=2V, ILOAD=10mA VCONT=2.7V, to 12V VPWR=3.3V to 5.5V, ILOAD=10mA to 5A IO = 10mA, VIN =5V, T= 25 °C IO = 10mA, VIN =5V, T= 25 °C VCONT=VOUT+2.5V, ILOAD=10mA VCONT=VOUT+2.5V, ILOAD=5A (Vin-Vout)=3V VIN =5V IO = 10mA, VIN =5V T= 25 °C, 30ms pulse T= 25 °C, VIN =5V TO-220 Junction to Tab Junction to Ambient DD Package Junction to Tab Junction to Ambient 5.5
MIN
1.485 1.475 2.475 2.460 2.970 2.950 3.267 3.247 4.950 4.920 1.238 1.230
TYP
1.5 2.5 3.0 3.3 5.0 1.250 0.04 0.08 0.10 0.55 5 6.8 6 0.5 0.003 80 3.0 60 3.0 60
MAX
1.515 1.525 2.525 2.540 3.030 3.050 3.333 3.353 5.050 5.080 1.262 1.270 0.2 0.40 0.17 0.70 10 10
UNIT
V
Reference Voltage Line Regulation (1) Load Regulation (1) Dropout Voltage Minimum load Current Current Limit Ground Pin Current Temperature Stability Thermal Regulation Ripple Rejection Thermal Resistance
Vref REG (line) REG (LOAD) VPWR-VOUT Imin IS IQ TS RA -
V %
V mA A mA % %/W dB °C/W
60
3.0 60 3.0 60
Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1581
PIN DESCRIPTION
1. Sense = Allows Kelvin sense of VOUT at the load. (Positive side of the reference voltage of the device). 2. ADJ = Negative side of the reference voltage for the device. Adding a small bypass capacitor from the ADJ pin to ground will improve the transient response. 3. VOUT = Power output of the device. 4. VCTRL = Supply pin for the control circuitry of the device. The current flow into this pin will be about 1% of the output current. VCTRL must be between 1.0V and 1.3V greater than the output voltage for the device to regulate. 5. VIN = Output load current is supplied through this pin. VIN must be between 0.1V and 0.8V greater than the output voltage for the device to regulate.
BLOCK DIAGRAM
(4) VCTRL S.O.A
VIN (5)
CURRENT LIMIT AMPLIFIER
LIMIT SENSE VOUT (3)
THERMAL OVERLOAD SENSE (1) VOLTAGE REGULATION AMPLIFIER
VREF
ADJ (2)
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1581
APPLICATIONS NOTES
The B1581 is designed as a high performance and low cost solution for application requiring a lower dropout than traditional NPN regulators. The B1581 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 heat sink and cooling fan cost. A typical application would use 5V for Vin and 3.3V for VCTRL from a motherboard power supply to provide a nominal 2.5V output. Using the sense pin allows to Kelvin measure the output, reducing resistive-associated errors. The B1581 can power the 2.5V core voltage for microprocessors such as Pentium, P55C, AMD5k86 and K6 and the IBM PowerPC 603EV and 604EV processors. *The reduction of heat dissipation is a result of the increase of the regulator efficiency (efficiency = VOUT / VIN). Adjustable Regulator Design 1.25V reference voltage is being developed between the SENSE pin and the ADJ pin of the AS1581. 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 typically 50µA. 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 regulation. Lowering Noise Using the SENSE pin to Kelvin the load will increase accuracy of the output voltage during load regulation. For the fixed voltage devices, adding a capacitor at the GND pin will improve transient response. This capacitor is chosen in the range of 1µF to 0.1µF and will depend on the amount of output capacitance in the system.
TYPICAL APPLICATION
Fig. 1 Adjustable Regulator
3.3V VIN 5V VCTRL C1 330uF
VIN 5
BAY LINEAR B1581
2 ADJ
3
VOUT
2.5V VOUT
VCTRL
4
1 SENSE R1 124 C4 2 X 330uF
C2 10uF
C3 .033uF
R1 124
(1) V CTRL needed when VIN < 5V. (2) V OUT = V REF (1 + R2/ R1) + I ADJ R2. (3) V REF is measured across adjust to sense.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1581
Fig.2 Typical Fixed Regulator
3.3V VIN C1 5V VCTRL
330uF
VIN 5
BAY LINEAR B1581
2
3
VOUT
2.5V VOUT
4 VCTRL
1 SENSE FIXED
C2 10uF
C4 2 X 330uF
C3 .033uF
(1) VCTRL is needed when VIN <5V.
0.055 (1.397) 0.405 ± 0.005 (10.287 ± 0.127)
0.176 ± 0.005 (4.470 ± 0.127) 0.050 ± 0.002 (1.270 ± 0.051)
0.356 ± 0.005 (9.042 ± 0.127)
0.600 ± 0.025 (15.24 ± 0.635)
0.100 ± 0.010 (2.540 ± 0.254)
0.067 ± 0.005 (1.702 ± 0.127)
0.032 ± 0.003 (0.813 ± 0.076)
0.015 + 0.003 (0.381 + 0.074) 0° 8°
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
Others parts begin by b1
B1-1 B1-2
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