LM2937_11

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 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 Lead Free LM2937L-xx-TA3-T LM2937L-xx-TQ2-R LM2937L-xx-TQ2-T LM2937L-xx-TQ3-R LM2937L-xx-TQ3-T LM2937L-xx-TQ5-R LM2937L-xx-TQ5-T Halogen Free LM2937G-xx-TA3-T LM2937G-xx-TQ2-R LM2937G-xx-TQ2-T LM2937G-xx-TQ3-R LM2937G-xx-TQ3-T LM2937G-xx-TQ5-R LM2937G-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 © 2011 Unisonic Technologies Co., Ltd 1 of 10 QW-R102-012.G LM2937 ORDERING INFORMATION (Cont.) LINEAR INTEGRATED CIRCUIT 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 TO-263-5 33 50 80 10 12 15 :3.3V :5.0V :8.0V :10V :12V :15V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R102-012.G 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 Junction to Ambient Junction to Case TO-220 TO-263/ TO-263-5 TO-220 TO-263/ TO-263-5 SYMBOL θJA θJC RATINGS 65 73 3 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 SYMBOL TEST CONDITIONS MIN Output Voltage VOUT 5mA≤IOUT≤500mA 3.21 Line Regulation △VOUT VOUT+2V≤VIN≤26V, IOUT=5mA Load Regulation △VOUT 5mA≤IOUT≤500mA (VO+2V)≤VIN ≤26V, IOUT=5mA Quiescent Current IQ VIN= VOUT+5V, IOUT=500mA Output Noise Voltage eN 10Hz-100kHz, IOUT=5mA Long Term Stability 1000Hrs IOUT=500mA Dropout Voltage VD IOUT=50mA Short Circuit Current ISC 0.6 Peak Line Transient Voltage TIN tF≤100ms, RL=100Ω 60 Reverse DC Input Voltage VRIN VOUT ≥-0.6V, RL=100Ω -15 Reverse Transient Input Voltage VTRRI tF