UNISONIC TECHNOLOGIES CO., LTD LR478 LINEAR INTEGRATED CIRCUIT REGULATOR+RESET IC DESCRIPTION The UTC LR478 developed for use in CD-ROM drives, combines a 3V regulator adapted to low power consumption with a much-sought reset function (regulator input monitoring),with internal delay circuit, set to detect 4.2V. FEATURES *Large Output Current: 300mA (max.) *High Ripple Rejection Rate: 80dB(typ.) *Internal Thermal Shutdown Circuit *Internal Current Limiting Circuit *Easy Set Delay Time from Voltage Detection to Reset Release ORDERING INFORMATION Order Number Lead Free Halogen Free LR478L-xx-S08-T LR478G-xx-S08-T LR478L-xx-S08-R LR478G-xx-S08-R Note: XX: Output Voltage, refer to Marking Information. Packing SOP-8 SOP-8 Tube Tape Reel OUTPUT DETECTION VOLTAGE RANK LIST PART NUMBER LR478-3.4V LR478-3.3V LR478-2.5V Package REGULATOR OUTPUT VOLTAGE (V) 3.40±0.05 3.30±0.05 2.50±0.05 DETECTION VOLTAGE (V) 4.20±0.09 4.20±0.09 4.20±0.09 MARKING INFORMATION PACKAGE VOLTAGE CODE SOP-8 25: 2.5V 33: 3.3V 34: 3.4V www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., LTD MARKING 1 of 8 QW-R119-003.C LR478 PIN CONFIGURATION N.C 1 8 Cd RESET 2 7 GND CONT 3 6 N.C VIN 4 5 VOUT PIN DESCRIPTION PIN NO. 1 PIN NAME N.C FUNCTIONS EQUIVALENT CIRCUIT DIAGRAM Input voltage detection output Input voltage detection output pin RESET pin logic 2 RESET VIN<VS VIN>VS RESET L H Output voltage on/off-control pin 3 4 5 6 7 8 RESET VCONT L H CONT VIN VOUT N.C GND Cd Output OFF ON Connect cont-terminal with VIN when it is not used. Voltage supply input pin Regulator Output pin GND pin Delay time capacitor pin RESET pin output delay time can be set by the capacitance connected to the Cd pin. tPLH=100000.C tPLH: transmission delay time[s] C: capacitor value [F] UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CONT 300K 400K V OUT Cd + - LINEAR INTEGRATED CIRCUIT 2 of 8 QW-R119-003.C LR478 LINEAR INTEGRATED CIRCUIT BLACK DIAGRAM 4 VIN 5 VOUT + CONT + Thermal Protect 3 + + UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 RESET 7 GND 8 Cd 3 of 8 QW-R119-003.C LR478 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3 ~ +10 V Output Current IOUT 400 mA Power Dissipation(note3) PD 700 mW Junction Temperature TJ +125 C Operating Temperature TOPR -40 ~ +85 C Storage Temperature TSTG -40~+150 C Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. The device is guaranteed to meet performance specification within 0℃ ~ +70℃ operating temperature range and assured by design from –20℃ ~ +85℃. RECOMMENDED OPERATION CONDITIONS PARAMETER Operating Voltage Output Current SYMBOL VOPR IOUT RATINGS 0 ~ 10 0 ~ 300 UNIT V mA ELECTRICAL CHARACTERISTICS(VCONT =1.6V, Ta=25C, unless otherwise specified ) PARAMETER No-load Input Current 1 No-load Input Current 2 Input Current (OFF) Regulator Output Voltage Input-Output Different Voltage Line Regulation Load Regulation VOUT Temperature Coefficient SYMBOL TEST CONDITIONS IQ1 VIN=5V, IOUT=0mA IQ2 VIN=4V, IOUT=0mA IQ3 VIN=5V, VCONT=0.4V MIN TYP 3 4 250 MAX 8 UNIT mA mA μA VOUT VI/O(DIFF) ∆VOUT ∆VOUT ∆VOUT/∆T 3.33 3.40 0.15 10 20 100 3.47 0.3 20 120 V V mV mV ppm/C 50 80 Ripple Rejection Output Noise Voltage CONT Terminal Current High Threshold Voltage Low Threshold Voltage Reset Detection Voltage Vs Temperature Coefficient Hysteresis Voltage Low-Level Output Voltage Output Leakage Current Output Current 1 Output Current 2 “H” Transmission Delay Time Reset Delay Time “L” Transmission Delay Time Threshold Operating Voltage RR VIN ICONT VTHR(H) VTHR(L) VS ∆VS/∆T VHYS VOL ILEAK IOUT1 IOUT2 tPLH tPLH 1 tPLH VTHR(OPR) VIN=5V, IOUT=30mA VIN=3.2V, IOUT=150mA VIN=4.4~5.5V, IOUT=30mA VIN=5V, IOUT=0~300mA VIN=5V, IOUT=30mA, TJ= -20~85C VIN=5V, IOUT=30mA, f=120Hz VRIPPLE=1VP-P VIN=5V, IOUT=30mA, f=20~80kHz VCONT=1.6V 1.6 -0.3 VIN= VTHR(H)→VTHR(L) TJ= -20~85C VIN= VTHR(H)→VTHR(L)→VTHR(H) VIN=3.9V, RL=4.7K VIN=5V VIN=3.9V, RL=0 VIN=3.9V, RL=0, Ta= -20~85C Cd =0.0μF VIN=4V→5V, Cd =0.1μF VoL=0.4V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 40 5 4.11 4.20 100 100 dB 120 μVrms 10 μA VIN+0.3 V 0.4 V 4.29 100 200 200 ±0.1 30 10 30 0.65 90 20 90 0.85 5 3 5 V ppm/C mV mV μA mA mA μs ms μs V 4 of 8 QW-R119-003.C LR478 TEST CIRCUIT VIN A 4 5 1µF VOUT UTC LR478 4.7kO 2 8 3 RESET 7 A + LINEAR INTEGRATED CIRCUIT 6 GND 47µF Cd V 0.1µF CONT TYPICAL APPLICATION CIRCUIT VIN 4 5 1µF 4.7kO VOUT UTC LR478 + 2 RESET 8 3 7 6 GND COUT 47µF Cd 0.1µF CONT Note: External output-capacitor(COUT) for stability is necessary due to without internally compensated. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R119-003.C LR478 LINEAR INTEGRATED CIRCUIT TIMING CHART V IN 5V ? Vs VS 0V CONT H L V OUT 5V 0V RESET tPLH1 5V 0V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R119-003.C LR478 TYPICAL CHARACTERISTICS Detection Voltage Output Volttage vs Temperature IOUT =0mA 4 Output Voltage (V) Output Voltage (V) 5 VOUT 3 2 RESET 1 0 0 1 2 3 Input Voltage (V) 4 5 Line Regulation 20 Load Regulation (mV) Line Regulation (mV) 10 5 0 -5 -10 -15 -20 4 6 5 7 8 3.5 3.48 3.46 3.44 3.42 3.4 3.38 3.36 3.34 3.32 3.3 -25 0 9 -20 0 50 Output Voltage (V) 50 40 30 20 100000 Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 100 150 200 Detecting Volttage vs Temperature 70 60 10000 300 -10 Ripple Rejection 1000 250 0 Output Current (mA) 100 90 80 100 125 10 Input Voltage (V) 10 0 10 100 20 -30 10 25 50 75 Temperature (°C) Load Regulation 30 15 Ripple Rejection (dB) LINEAR INTEGRATED CIRCUIT 4.3 4.28 4.26 4.24 4.22 4.2 4.18 4.16 4.14 4.12 4.1 -25 0 25 50 75 100 125 Temperature (°C) 7 of 8 QW-R119-003.C LR478 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) Allowable Loss 1000 Allowable loss (mV) On board 25×40×1mm 800 600 400 200 0 0 25 50 75 100 125 Temperature (°C) 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 www.unisonic.com.tw 8 of 8 QW-R119-003.C