UNISONIC TECHNOLOGIES CO., LTD

Transcription

1 UNISONIC TECHNOLOGIES CO., LTD 5mA LOW DROPOUT VOLTAGE REGULATOR DESCRIPTION The UTC LM2937 is a positive voltage regulator capable of supplying up to 5mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 5mA the minimum input to output voltage differential required for the output to remain in regulation is typically.5v(v guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only ma with a full 5mA 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 +6V/-5V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in. FEATURES * Fully specified for operation over -4 C~ +25 C * Output current in excess of 5mA * Output trimmed for 5% tolerance under all operating conditions * Typical dropout voltage of.5v at full rated load current * Wide output capacitor ESR range, up to 3Ω * Reverse battery protection * Internal short circuit and thermal overload protection * 6V input transient protection * Mirror image insertion protection * Built-in ON/OFF control function ORDERING INFORMATION TO-22 TO-263 TO TO Order Number Lead Free Halogen Free Package Packing LM2937L-xx-TA3-T LM2937G-xx-TA3-T TO-22 Tube LM2937L-xx-TQ2-R LM2937G-xx-TQ2-R TO-263 Tape Reel LM2937L-xx-TQ2-T LM2937G-xx-TQ2-T TO-263 Tube LM2937L-xx-TQ3-R LM2937G-xx-TQ3-R TO Tape Reel LM2937L-xx-TQ3-T LM2937G-xx-TQ3-T TO Tube LM2937L-xx-TQ5-R LM2937G-xx-TQ5-R TO Tape Reel LM2937L-xx-TQ5-T LM2937G-xx-TQ5-T TO Tube of Copyright 2 Unisonic Technologies Co., Ltd QW-R2-2.G

2 ORDERING INFORMATION (Cont.) PIN CONFIGURATION PIN NO. TO-263/TO-263-3/TO-22 TO PIN NAME 4 Input 2 3 GND 3 5 Output - N/C - 2 ON/OFF MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING TO-22 TO-263 TO TO :3.3V 5 :5.V 8 :8.V :V 2 :2V 5 :5V UNISONIC TECHNOLOGIES CO., LTD 2 of QW-R2-2.G

3 ABSOLUTE MAXIMUM RATINGS (Note ) PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN 26 V Power Dissipation(Note 2) P D Internally limited Maximum Junction Temperature T J +5 C Storage Temperature T STG -4 ~ +5 C Note. 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 P MAX = (25-T A )/ θ JA, where 25 is the maximum junction temperature for operation, T A is the ambient temperature, and θ JA is the junction to ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 25 C and the electrical specifications do not apply. If the die temperature rises above 5 C, the LM2937 will go into thermal shutdown. THERMAL DATA Junction to Ambient Junction to Case PARAMETER SYMBOL RATINGS UNIT TO θ JA TO-263/ TO C/W TO-22 3 θ JC TO-263/ TO ELECTRICAL CHARACTERISTICS (V IN =V NOM +5V, I OUT =5mA, C OUT =μf, T J =Ta=25 C, unless otherwise specified.) For LM V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 9 3 mv OUT 5mA I OUT 5mA 3 3 mv (V O +2V) V IN 26V, I OUT =5mA 2 ma V IN = V OUT +5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA μvrms Long Term Stability Hrs 2 mv I OUT =5mA.5. V I OUT =5mA 25 mv Short Circuit Current I SC.6. A Peak Line Transient Voltage T IN t F ms, R L =Ω 6 75 V Reverse DC Input Voltage V RIN V OUT -.6V, R L =Ω -5-3 V Reverse Transient Input Voltage V TRRI t F <ms, R L =Ω V UNISONIC TECHNOLOGIES CO., LTD 3 of QW-R2-2.G

4 ELECTRICAL CHARACTERISTICS (Cont.) For LM V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 5 5 mv OUT 5mA I OUT 5mA 5 5 mv (V OUT +2V) V IN 26V, I OUT =5mA 2 ma V IN = V OUT +5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA 5 μvrms Long Term Stability Hrs 2 mv I OUT =5mA.5. V I OUT =5mA 25 mv TEST CONDITIONS MIN TYP MAX UNIT.6. A tf ms, RL=Ω 6 75 V VOUT -.6V, RL=Ω -5-3 V tf<ms, RL=Ω V For LM V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 24 8 mv OUT 5mA I OUT 5mA 8 8 mv (V OUT +2V) V IN 26V,I OUT =5mA 2 ma V IN = Vo+5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA 24 μvrms Long Term Stability Hrs 32 mv I OUT =5mA.5. V I OUT =5mA 25 mv Short Circuit Current I SC.6. A Peak Line Transient Voltage T IN t F ms, R L =Ω 6 75 V Reverse DC Input Voltage V RIN V OUT -.6V, R L =Ω -5-3 V Reverse Transient Input Voltage V TRRI t F <ms, R L =Ω V For LM2937-.V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 3 mv OUT 5mA I OUT 5mA mv (V OUT +2V) V IN 26V,I OUT =5mA 2 ma V IN = V OUT +5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA 3 μvrms Long Term Stability Hrs 4 mv I OUT =5mA.5. V I OUT =5mA 25 mv Short Circuit Current I SC.6. A Peak Line Transient Voltage T IN t F ms,r L =Ω 6 75 V Reverse DC Input Voltage V RIN V OUT -.6V,R L =Ω -5-3 V Reverse Transient Input Voltage V TRRI t F <ms,r L =Ω V UNISONIC TECHNOLOGIES CO., LTD 4 of QW-R2-2.G

5 ELECTRICAL CHARACTERISTICS (Cont.) For LM V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 36 2 mv OUT 5mA I OUT 5mA 2 2 mv (V OUT +2V) V IN 26V,I OUT =5mA 2 ma V IN = V OUT +5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA 36 μvrms Long Term Stability Hrs 44 mv I OUT =5mA.5. V I OUT =5mA 25 mv Short Circuit Current I SC.6. A Peak Line Transient Voltage T IN t F ms, R L =Ω 6 75 V Reverse DC Input Voltage V RIN V OUT -.6V, R L =Ω -5-3 V Reverse Transient Input Voltage V TRRI t F <ms, R L =Ω V For LM V Output Voltage V OUT 5mA I OUT 5mA V Line Regulation OUT V OUT +2V V IN 26V, I OUT =5mA 45 5 mv OUT 5mA I OUT 5mA 5 5 mv (V OUT +2V) V IN 26V,I OUT =5mA 2 ma V IN = V OUT +5V, I OUT =5mA 2 ma Output Noise Voltage en Hz-kHz, I OUT =5mA 45 μvrms Long Term Stability Hrs 56 mv I OUT =5mA.5. V I OUT =5mA 25 mv Short Circuit Current I SC.6. A Peak Line Transient Voltage T IN t F ms, R L =Ω 6 75 V Reverse DC Input Voltage V RIN V OUT -.6V, R L =Ω -5-3 V Reverse Transient Input Voltage V TRRI t F <ms, R L =Ω V ON/OFF CONTROL (For 5 pins only) ON/OFF Threshold Voltage ON V ON I OUT.5A.8 V ON/OFF Threshold Voltage OFF V OFF I OUT.5A 2. V ON/OFF Threshold Current I ON/OFF V ON/OFF =2.V, I OUT =.5A 5 μa UNISONIC TECHNOLOGIES CO., LTD 5 of QW-R2-2.G

6 TYPICAL APPLICATION ON/OFF CONTROL APPLICATION * Required if the regulator is located more than 3 inches from the power supply filter capacitors. **Required for stability. C OUT must be at least μf (over the full expected operating temperature range) and located as close as possible to the regulator. The equivalent series resistance, ESR, of this capacitor may be as high as 3Ω. UNISONIC TECHNOLOGIES CO., LTD 6 of QW-R2-2.G

7 TYPICAL CHARACTERISTICS ( V) vs Output Current.9 TJ= Output Current (ma) (V) vs Temperature A.5.25A A Temperature ( ) Output Voltage vs Temperature RL=Ω Temperature ( ) (ma) 2 vs Temperature 5 5mA 25mA 5 5mA Temperature ( ) (ma) vs Input Voltage VOUT=5V Ta=25.5A 3.25A 2.5A (ma) vs Input Voltage VIN=4V VOUT=5V TJ= Output Current (ma) UNISONIC TECHNOLOGIES CO., LTD 7 of QW-R2-2.G

8 TYPICAL CHARACTERISTICS(Cont.) Output Voltage Deviation (mv) Line Transient Response IOUT=5mA VOUT=5 V Ta=25 Output Voltage Deviation (mv) 5-5 Load Transient Response Input Voltage Change (V) 3V V Time (μs) Load Current (A) Time (μs) 5 6 Ripple Rejection (db) Ripple Rejection VIN=V VOUT=5 V 7 COUT= μf IOUT=5mA IOUT=5mA VOUT=5 V TJ=25 Low Voltage Behavior K K K Frequency (Hz) M IOUT=5mA TJ=25 Low Voltage Behavior VOUT=V VOUT=8 V Low Voltage Behavior 8 IOUT=5mA 5 TJ=25 VOUT=5 V 2 VOUT=2 V UNISONIC TECHNOLOGIES CO., LTD 8 of QW-R2-2.G

9 TYPICAL CHARACTERISTICS(Cont.) 2 Output at Voltage Extremes 2 Output at Voltage Extremes RL=Ω VOUT=V 6 RL=Ω VOUT=5V VOUT=8V VOUT=5V VOUT=2V Output Impedance (Ω) Output Impedance VIN=4V VOUT=5 V COUT=μF IOUT=25mA... K K K M Frequency (Hz) Equivalent Series Resistance (Ω) Output Capacitor ESR VOUT=5V COUT=μF. STABLE REGION Output Current (ma).5 Peak Output Current VIN=4V Output Current (A) Temperature ( ) 2 UNISONIC TECHNOLOGIES CO., LTD 9 of QW-R2-2.G

10 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD of QW-R2-2.G