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Details, datasheet, quote on part number:LM2941N
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Datasheet text preview:
Bay Linear
Inspire the Linear Power
1.25A High Current Low Dropout
Voltage Regulator Adjustable
LM2940/2941
Description
The Bay Linear LM2940 & LM2941 is a 1.25A high accuracy, low dropout voltage regulator with only 40mV at light loads and 350mV(Typ.)@ 1.0A) and low quiescent current of 240µA typical. The LM2940/41 is designed for low voltage a application that requires lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage applications where require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications. The LM2940/41 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The LM2940-xx devices are in 3 pin fixed voltage regulators. The LM2941 include an Enable pin in the 5 pin packages. The LM2940/41 are offered in a 3 & 5-pin SOT-223, TO-220 & TO-263 package compatible with other 3 terminal regulators. The LM2940/41 is also offer in a new LPDD (Low Profile TO-263) package from 4.47 mm (DD) tickness down to only 1.27 mm (LPDD) t t l ti k
Features
· · · · · · · · · High output accuracy of 1% Output Adjustable from 1.24V to 26V Output Current of 1.25A Low Dropout Voltage Low quiescent current Extremely Tight Load & Line Regulation Reverse-battery and "Load Dump" Protection Zero Current Shutdown Mode (5-pin version) Offer in TO-263, TO-220, SOT-223, & New Slim LPDD Similar to industry Standard MIC2940LM2941
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Applications
· · · · · · · Powering VGA & Sound Card LCD Monitor Battery Powered Equipments/Laptop & Notebook SMPS Post Regulator / DC to DC Modules High Efficiency Linear Power Supply Adjustable Power Supply Bar Code Scanners
Pin Connection
Ordering Information
Devices
LM2940T LM2941T LM2940S LM2941S LM2940N LM2941N LM2940J LM2941J
TO-220-3 Package TO-220-5 Package TO-263-5 Package
B AY B2940 B AY B AY B2941 1 2345
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.
-40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C -40 °C to 125 °C
TO-263-3 TO-263-3 Package
1) ADJUST 2) ON/OFF 3) GND 4) INPUT 5) OUPUT
B AY B2940 1 2 3
V IN
GND V OUT
V
IN
GND V
OUT
1 234 5
Front View
Front View
Top View
Top View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM2940/41
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 5 Seconds).........260°C Storage Temperature Range...... -65° to +150°C Operating Junction Temperature Range LM2940/2941 Control Section......... -45°C +125°C LM2940/2941 Power Transistor........-45°C +150°C Input Voltage ........ 26V Maximum Output Current...3.5A Input Supply Voltage (Note1) (Survival)-20V to +60V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 5mA, V IN =V OUT + 1V, I l = 1000mA, C L = 10µF. Ta=25°C, unless otherwise specified. The LM2941 is programmed to output 5V and has V SHUTDOWN 0.6V
PARAMETER
2.5V Version
CONDITIONS
IOUT = 5mA 5mA IOUT1.25A, 4.75VVIN 26V IOUT = 5mA 5mA IOUT1.25A, 4.75VVIN 26V IOUT = 5mA 5mA IOUT1.25A, 5.5VVIN 26V 5mA IOUT1.0 A IO = 5mA, (VOUT + 1V) VIN 26V VIN = VOUT + 5V, 5mA IOUT 1 A (Note 2, 6) Output Voltage (Note 6) Temperature Coef.
Typ Min
2.5 2.5 3.3 3.3 5.0 5.0 2.475 2.450 3.267 3.234 4.95 4.90 -1 -2 -2.5
LM2940 Max
2.525 2.550 3.330 3.366 5.05 5.10 1 2 2.5 0.5 1.6 100 150 450 600 350 35 70
Units
V
Output Voltage (Note 2)
3.3V Version2.
Output Voltage (Note 2)
5.0V Version
V
Output Voltage (Note 2) Output Voltage Accuracy
All Voltage Options
V %
Line Regulation Load Regulation V° T Dropout Voltage
0.06 0.2 20 80 350 400 240 22 35 0.9 1.7 400 260 1.235 1.223 1.210 1.204 1.5
% % ppm/°C mV
IO = 5mA IO = 1000mA IO = 1.25A
Ground Current IGNDDO 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 Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient
IO = 5mA, VIN = VOUT, +1V IO = 1000mA, VIN = VOUT, +1V IO = 1.25A
VIN = 0.5V less than specified VOUT IOUT = 10mA VOUT = 0V (Note 4) CL = 10µF CL = 33µF
µA mA mA A µV RMS
(Note 8)` 40 (Note 7) 20
1.247 1.260 1.266 80 120
V Vmax V nA ppm/°C
0.1
nA/°C
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM2940/2941
ENABLE Input LM2941
Input Logic Voltage Low (OFF) High (ON) V 0.8 2.4 VEN = 26V VEN = 0.8V (Note 10) 10 500 100 600 750 2.5 5 V µA µA
Enable Pin Input Current Regulator Output Current in Shutdown
NOTES:
The Bold specifications apply to the full operating temperature range. Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 26V. Note 2: Full load current (IFL) is defined as 1.25A for the LM2941. Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. 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 changed divided by the total temperature range. Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse as VIN = 20V (a 4W pulse) for T = 10ms. Note 8: VREF VOUT (VIN - 1), 2.3V VIN 26V, 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 remains 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 26V, VOUT = 0.
BLOCK DIAGRAM
IN
OUT
O.V ILIMIT
FLAG
+ -
1.180V
Reference
1.240V
+ -
28V
R1*
ADJ EN
Thermal Shutdown
R2*
GND
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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