LM2937

UNISONIC TECHNOLOGIES CO., LTD LM2937 500mA LOW DROPOUT VOLTAGE REGULATOR 1 DESCRIPTION The UTC LM2937 is a positive voltage regulator capable of supplying up to 500mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V(1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10mA with a full 500mA load current when the input to output voltage differential is greater than 3V. The UTC LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The UTC LM2937 is stable for all ESR below 3Ω.This allows the use of low ESR chip capacitors. Ideally suited for automotive applications, the UTC LM2937 will protect itself and any load circuitry from reverse battery connections, two-battery jumps and up to +60V/-50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in. LINEAR INTEGRATED CIRCUIT TO-220 1 TO-263 1 TO-263-3 1 TO-263-5 *Pb-free plating product number:LM2937L-XX FEATURES * Fully specified for operation over -40°C~ +125°C * Output current in excess of 500mA * Output trimmed for 5% tolerance under all operating conditions * Typical dropout voltage of 0.5V at full rated load current * Wide output capacitor ESR range, up to 3Ω * Reverse battery protection * Internal short circuit and thermal overload protection * 60V input transient protection * Mirror image insertion protection * Built-in ON/OFF control function ORDERING INFORMATION Order Number Normal Lead Free Plating LM2937-xx-TA3-T LM2937L-xx-TA3-T LM2937-xx-TQ2-R LM2937L-xx-TQ2-R LM2937-xx-TQ2-T LM2937L-xx-TQ2-T LM2937-xx-TQ3-R LM2937L-xx-TQ3-R LM2937-xx-TQ3-T LM2937L-xx-TQ3-T LM2937-xx-TQ5-R LM2937L-xx-TQ5-R LM2937-xx-TQ5-T LM2937L-xx-TQ5-T Package TO-220 TO-263 TO-263 TO-263-3 TO-263-3 TO-263-5 TO-263-5 Packing Tube Tape Reel Tube Tape Reel Tube Tape Reel Tube www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 10 QW-R102-012.F LM2937 ORDERING INFORMATION (Cont.) LM2937L-xx-TA3-R LINEAR INTEGRATED CIRCUIT (1)Packing Type (2)Package Type (3)Output Voltage Code (4)Lead Plating (1) R: Tape Reel, T: Tube (2) TA3: TO-220, TQ2: TO-263, TQ3: TO-263-3, TQ 5: TO-263-5 (3) xx: refer to Marking Information (4) L: Lead Free Plating, Blank: Pb/Sn PIN CONFIGURATION PIN NO. TO-263/TO-263-3/TO-220 1 2 3 TO-263-5 4 3 5 1 2 PIN NAME Input GND Output N/C ON/OFF MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING TO-220 TO-263 TO-263-3 U TC LM2937 33 50 80 10 12 15 :3.3V :5.0V :8.0V :10V :12V :15V VOLTAGECODE LEAD PLATING DATE CODE 1 2 3 TO-263-5 U TC LM2937 VOLTAGE CODE LEAD PLATING DATE CODE 12345 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R102-012.F LM2937 ABSOLUTE MAXIMUM RATINGS (Note 1) LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN 26 V Power Dissipation(Note 2) PD Internally limited Maximum Junction Temperature TJ +150 °C Storage Temperature TSTG -40 ~ +150 °C Note 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical Specifications do not apply when operating the device outside of its rated Operating Conditions. 2. The maximum allowable power dissipation at any ambient temperature is PMAX = (125-TA)/ θJA, where 125 is the maximum junction temperature for operation, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125°C and the electrical specifications do not apply. If the die temperature rises above 150°C, the LM2937 will go into thermal shutdown. THERMAL DATA PARAMETER Thermal Resistance Junction- Ambient TO-220 TO-263 TO-263-5 TO-220 Thermal Resistance Junction- Case TO-263 TO-263-5 θJC SYMBOL θJA RATINGS 65 73 73 3 4 4 UNIT °C/W ELECTRICAL CHARACTERISTICS (VIN=VNOM+5V, IOUT=500mA, COUT=10µF, TJ=Ta=25°C, unless otherwise specified.) For LM2937-3.3V PARAMETER Output Voltage Line Regulation Load Regulation Quiescent Current Output Noise Voltage Long Term Stability Dropout Voltage Short Circuit Current Peak Line Transient Voltage Reverse DC Input Voltage Reverse Transient Input Voltage SYMBOL VOUT △VOUT △VOUT IQ eN VD ISC TIN VRIN VTRRI SYMBOL VOUT △VOUT △VOUT IQ eN VD TEST CONDITIONS 5mA≤IOUT≤500mA VOUT+2V≤VIN≤26V, IOUT=5mA 5mA≤IOUT≤500mA (VO+2V)≤VIN ≤26V, IOUT=5mA VIN= VOUT+5V, IOUT=500mA 10Hz-100kHz, IOUT=5mA 1000Hrs IOUT=500mA IOUT=50mA tF≤100ms, RL=100Ω VOUT ≥-0.6V, RL=100Ω tF