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 SOP-8 *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 *Pb-free plating product number: LR478L ORDERING INFORMATION Order Number Normal Lead Free Plating LR478-xx-S08-R LR478L-xx-S08-R LR478-xx-S08-T LR478L-xx-S08-T Package Packing SOP-8 SOP-8 Tape Reel Tube Note: xx: Output Voltage, refer to Rank List as below. OUTPUT DETECTION VOLTAGE RANK LIST PART NUMBER LR478-3.4V LR478-3.3V LR478-2.5V REGULATOR OUTPUT VOLTAGE (V) 3.40±0.05 3.30±0.05 2.50±0.05 www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., LTD DETECTION VOLTAGE (V) 4.20±0.09 4.20±0.09 4.20±0.09 1 of 8 QW-R112-001,B LR478 LINEAR INTEGRATED CIRCUIT 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 RESET VIN<VS L VIN>VS H Output voltage on/off-control pin VCONT 3 RESET L H CONT Output OFF ON CONT 300K 400K 8 VIN VOUT N.C GND Cd 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 V OUT Cd + - 4 5 6 7 Connect cont-terminal with VIN when it is not used. Voltage supply input pin Regulator Output pin 2 of 8 QW-R112-001,B 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-R112-001,B 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 -20 ~ +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 SYMBOL VOPR IOUT Operating Voltage Output Current RATINGS 0 ~ 10 0 ~ 300 UNIT V mA ELECTRICAL CHARACTERISTICS(VCONT =1.6V, Ta=25°C, 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 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 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 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= -20~85°C 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= -20~85°C 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= -20~85°C 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-R112-001,B LR478 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT VIN A 4 VOUT 5 A 1μF UTC LR478 + 4.7kΩ 2 Cd 8 3 RESET 7 6 47μF V 0.1μF GND CONT TYPICAL APPLICATION CIRCUIT VIN 4 5 VOUT 1μF UTC LR478 + 4.7kΩ 2 RESET 8 3 7 6 COUT 47μF Cd 0.1μF GND 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-R112-001,B LR478 LINEAR INTEGRATED CIRCUIT TIMING CHART V IN 5V ΔVs VS OV CONT H L V OUT 5V OV tPLH 1 RESET 5V OV UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R112-001,B LR478 LINEAR INTEGRATED CIRCUIT 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 Load Regulation (mV) Line Regulation (mV) 15 10 5 0 -5 -10 -15 7 8 9 3.34 3.32 3.3 -25 0 25 50 75 Temperature (℃) 100 125 250 300 Load Regulation 20 10 0 -10 -20 0 50 100 150 200 Input Voltage (V) Output Current (mA) Ripple Rejection Detecting Volttage vs Temperature 100 90 80 70 60 50 40 30 20 10 0 10 3.4 3.38 3.36 -30 10 Output Voltage (V) Ripple Rejection (dB) 6 5 3.44 3.42 30 20 -20 4 3.5 3.48 3.46 100 1000 10000 100000 Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 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 (℃) 7 of 8 QW-R112-001,B 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 (℃) 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-R112-001,B