Voltage Regulator Adjustable B2940/2941 Preliminary Informat

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Voltage Regulator Adjustable B2940/2941 Preliminary Informat

Datasheet Thumbnail

Top Searches for this datasheet

1.25A High Current Dropout
Voltage Regulator Adjustable
B2940/2941
Preliminary Information
Description
Linear B2940 B2941 1.25A high accuracy, dropout voltage regulator with only 40mV light loads 350mV(Typ.)@ 1.0A) quiescent current 240µA typical. B2940/41 designed voltage application that requires lower dropout voltage faster transient response. This device excellent choice powering voltage applications where require lower dropout, faster transient response regulate from +2.5V 3.8V supplies post regulator switching supplies applications. B2940/41 offers full protection against over-current faults, reversed input polarity, reversed load insertion, positive negative transient voltage. On-Chip trimming adjusts reference voltage B2940-xx devices fixed voltage regulators. B2941 include Enable packages. B2940/41 offered 5-pin SOT-223, TO-220 TO263 package compatible with other terminal regulators. B2940/41 also offer LPDD (Low Profile TO-263) package from 4.47 (DD) tickness down only 1.27 (LPDD) total tickness.
Features
High output accuracy Output Adjustable from 1.24V Output Current 1.25A Dropout Voltage quiescent current Extremely Tight Load Line Regulation Reverse-battery "Load Dump" Protection Zero Current Shutdown Mode (5-pin version) Offer TO-263, TO-220, SOT-223, Slim LPDD Similar industry Standard MIC2940LM2941
Applications
Powering Sound Card Monitor Battery Powered Equipments/Laptop Notebook SMPS Post Regulator Modules High Efficiency Linear Power Supply Adjustable Power Supply Code Scanners
Connection
Ordering Information
Devices
B2940T B2941T B2940S B2941S B2940N B2941N B2940J B2941J
TO-220-3 Package TO-220-5 Package TO-263-5 Package
B2940 B2941
B2941
Package
TO-220-3 TO-220-5 TO-263-3 TO-263-5 SOT-223-3 SOT-223-5 LPDD-3 LPDD-5
Temp.
TO-263-3 Package
ADJUST ON/OFF INPUT OUPUT
B2940
Front View
Front View
View
View
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B2940/41
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, Seconds) 260°C Storage Temperature Range -65° +150°C Operating Junction Temperature Range B2940/2941 Control Section -45°C +125°C B2940/2941 Power Transistor .-45°C +150°C Input Voltage. Maximum Output Current 3.5A Input Supply Voltage (Note1) (Survival)-20V +60V
ELECTRICAL CHARACTERISTICS (NOTE IOUT 5mA, 1000mA, 10µF. Ta=25°C, unless otherwise specified. B2941 programmed output SHUTDOWN 0.6V
PARAMETER
2.5V Version
CONDITIONS
IOUT IOUT1.25A, 4.75VVIN IOUT IOUT1.25A, 4.75VVIN IOUT IOUT1.25A, 5.5VVIN IOUT1.0 5mA, (VOUT VOUT IOUT (Note Output Voltage (Note Temperature Coef.
2.475 2.450 3.267 3.234 4.95 4.90 -2.5
B2940
2.525 2.550 3.330 3.366 5.05 5.10
Units
Output Voltage (Note
3.3V Version2.
Output Voltage (Note
5.0V Version
Output Voltage (Note Output Voltage Accuracy
Voltage Options
Line Regulation Load Regulation Dropout Voltage
0.06 1.235 1.223 1.210 1.204
ppm/°C
1000mA 1.25A
Ground Current
5mA, VOUT, 1000mA, VOUT, 1.25A
0.5V less than specified VOUT IOUT 10mA VOUT (Note 10µF 33µF
IGNDDO Ground Current Dropout Current Limit Output Noise Voltage (10Hz 100kHz) 100mA Reference Voltage Reference Voltage Adjust Bias Current Reference Voltage Temperature Coefficient Adjust Bias Current Temperature Coefficient
(Note (Note
1.247 1.260 1.266
Vmax ppm/°C
nA/°C
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B2940/2941
ENABLE Input B2941
Input Logic Voltage (OFF) High (ON) 0.8V
Enable Input Current Regulator Output Current Shutdown
(Note
NOTES:
Bold specifications apply full operating temperature range. Note Maximum positive supply voltage must limited duration (<100msec) duty cycle.) maximum continuous supply voltage 26V. Note Full load current (IFL) defined 1.25A B2941. Note Dropout voltage defined input-to output differential when output voltage drops nominal value with VOUT applied VIN. Note VOUT (NOMINAL) +1V. example, VIN= 4.3V 3.3V regulator. Employ pulse-testing procedures minimize temperature rise. Note Ground current regulator quiescent current. total current drawn from source load current ground current. Note Output voltage temperature coefficient defined worst case voltage changed divided total temperature range. Note Thermal regulation defined change output voltage time after change power dissipation applied, excluding load line regulation effects. Specifications 200mA load pulse pulse) 10ms. Note VREF VOUT (VIN 2.3V 26V, 10mA IFL, TJMAX Note Comparator threshold expressed terms voltage differential Adjust terminal below nominal reference voltage measured input. express these thresholds terms output voltage change, multiply error amplifier gain VOUT/VREF R2)/R2. example, programmable output voltage Error output guaranteed when output drops 95mVx 1.240V 38mV. Threshold remains constant percent VOUT VOUT varied, with dropout warning occurring typically below nominal, 7.7% guaranteed. Note 0.8V 26V, VOUT
BLOCK DIAGRAM
ILIMIT
FLAG
1.180V
Reference
1.240V
Thermal Shutdown
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B2940/2941
APPLICATION HINTS
Linear B2941 incorporates protection against over-current faults, reversed load insertion, over temperature operation, positive negative transient voltage. However, output capacitor required order insure stability performances.
Minimum Load Current
ensure proper behavior regulator light load, minimum load B2941 required.
Adjustable Regulator Design
B29152/53 adjustable regulators maybe programmed value between 1.25V using resistors. relation between resistors given R1=R2 (VOUT/1.240 Resistors have large value order reduce current consumption. This might interesting case widely varying load currents.
Thermal Consideration
Although B2941 offers 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 electrically isolated, thermally conductive spacer used. However forget consider contribution thermal resistance. Assuming: 10V, VOUT IOUT 1.5A, 90°C, CASE= 1°C/W external heat sink, wind) Power dissipation under these conditions (VIN VOUT) IOUT 7.5W Junction Temperature (CASE+ Control Section 90°C 7.5W*(1°C/W 0.6°C/W) 102°C 114°C TJUNCTION control section. Power Section 90°C 7.5W*(1°C/W 1.6°C/W) 104.5°C 109.5°C TJUNCTION power transistor. both case reliable operation insured adequate junction temperature.
Enable Input
B2941 features enable input allowing turning device. been designed compatible with TTL/CMOS logic. When regulator current flowing through this approximately 20µA.
B2940
Fig.1 Basic Fixed Output Regulator
Capacitor Requirements
output capacitor needed stability minimize output noise. required value capacitor varies with load. However, minimum value 10µF Aluminum will guarantee stability over load. tantalum capacitor recommended fast load transient response. power source high impedance, 0.1µF capacitor between input ground recommended. This capacitor should have good characteristics kHz.
B2941
VOUT
VOUT VREF (R1/ R2)]
enough pass minimum regulator load current
best results, total series resistance should small
Fig. Adjustable Output Voltage Regulator
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B2940/2941
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) 989-7144, Fax: (925) 940-9556
www.baylinear.com

Voltage Regulator Adjustable B2940/2941 Preliminary Informat

Top Searches for this datasheet

Other recent searches