LM2940

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 • 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 BAY B2940 BAY BAY 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 BAY 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 ≤IOUT≤1.25A, 4.75V≤VIN ≤26V IOUT = 5mA 5mA ≤IOUT≤1.25A, 4.75V≤VIN ≤26V IOUT = 5mA 5mA ≤IOUT≤1.25A, 5.5V≤VIN ≤26V 5mA ≤IOUT≤1.0 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 (