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| MITSUMI Regulator+Reset IC MM1482 Regulator+Reset IC Monolithic IC MM1482 Outline This IC, 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 1. Large output current 300mA max. 2. High ripple rejection rate 80dB typ. 3. Internal thermal shutdown circuit. 4. Internal current-limiting circuit. 5. Adjustment-free reset detection voltage 4.2V typ. 6. Easy to set delay time from voltage detection to reset release. 7. Operating temperature range and ripple elimination rate are available separately for 3 ranks. Package SOP-8D Applications 1. CD-ROM drive 2. Optical disc drivers Pin Assignment 8 7 6 5 1 2 3 4 5 6 7 8 --------------------------------------------------------------------- 1 2 3 4 SOP-8D (TOP VIEW) N. C RESET Cf VIN VOUT N. C GND Cd Equivalent Circuit Diagram MITSUMI Regulator+Reset IC MM1482 Pin Description Pin No. Pin name 1 2 N. C --------------------------------------------------------------------- Functions Equivalent circuit diagram RESET VIN pin voltage detection output --------------------------------------------------------------------- RESET pin logic _ _ RESET L H VIN 3 Cf Ripple-filter pin (RESET) Please connect a capacitor between Cf-GND to reject ripple voltage of VIN for RESET. It become C-R low-pass filter. Internal impedance of Cf is typically 14k. 4 5 6 7 8 VIN VOUT N. C GND Cd 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] Absolute Maximum Ratings Item Operating temperature 1 Symbol Ratings -30~+85 -40~+125 -0.3~+10 400 400(Alone)* 950(With board mounted)*2 Unit C C V mA mW TOPR TSTG VIN IOUT Pd * Storage temperature Supply voltage Output current Power dissipation Note1: Note2: *1 Rank B: -20 ~+80C ; Rank A: -30 ~ +85C *2 When mounted on a (Copper foil area 80% 192 142 1t mm glass epoxy board. MITSUMI Regulator+Reset IC MM1482 Recommended Operating Conditions Item Operating temperature Output current Operating voltage Note1: (Typical model MM1482C) (Except where noted otherwise, Ta=25C) Ratings -20~+80 0~300 0~10 Unit C mA V Symbol TOP IOP VOP *1 Rank B: -20 ~+80C ; Rank A: -30 ~ +85C (Typical model 1482C) (Except where noted otherwise, Ta=25C, VCONT=1.6V) (Except where noted otherwise, resistance unit is ) Electrical Characteristics Item No-Load Input Current Regulator Output Voltage Input-Output differential Voltage Line Regulation Load Regulation VOUT Temperature Coefficient Symbol Iccgl Measurement conditions VIN=5V IOUT=0mA C rank A, B rank VIN=5V IOUT =30mA VIN=3.2V IOUT=150mA VIN=4.4V~5.5V IOUT=30mA VIN=5V IOUT=0mA~300mA Tj=-20~+80C VIN=5V IOUT=30mA VIN=5V f=120Hz VRIPPLE=1VP-P IOUT=30mA C rank A, B rank VIN=5V, f=20~80kHz Min. Typ. Max. Unit 2.2 3.0 3.23 3.30 0.15 0.05 20 100 50 50 80 90 60 40 4.11 4.20 100 100 100 5 3 30 5 10 30 0.65 14 90 20 90 0.85 200 200 0.1 120 120 4.29 4 6.0 3.37 0.3 5 120 mA mA V V mV mV ppm/C dB dB Vrms Vrms V ppm/C mV mV A mA mA s ms s V k VOUT ViO V1 V2 * 1 VOUT/ T Ripple Rejection *1 * 1 RR Output Noise Voltage Vn IOUT=30mA C rank A, B rank Reset Detecting Voltage Vs temperature Coefficient Hysteresis Voltage Low-Level Output Voltage Output Leakage Current Output Current when ON 1 Output Current when ON 2 "H"Transmission Delay Time Reset Delay Time Vs VIN=H L Tj=20~80C VIN=H L H VIN=3.9V RL=4.7k VIN=5V VIN=3.9V, RL=0 VIN=3.9V, RL=0 Ta=-20~+80C Cd Pin open VIN=4V 5V, Cd=0.1F Cd pin open VOL=0.4V VIN=5V Vs/ T Vs VOL IOH IOL IOL tPLH tPLH1 tPHL VOPL RCF *1 *1 *1 *1 *1 "L"Transmission Delay Time Threshold Operating Voltage Cf terminal impedance Note 1: design guaranteed MITSUMI Regulator+Reset IC MM1482 Measuring Circuit Application Circuit Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (COUT) for stability. Note 2 : Please be careful with regard to set wiring and temperature-related capacitor changes that may cause oscillation. MITSUMI Regulator+Reset IC MM1482 Timing Chart VIN. 5V Vs Vs 0V VOUT 5V 0V tPLH1 RESET 5V 0V MITSUMI Regulator+Reset IC MM1482 Characteristics (Typical model MM1482C) Regulator Output 5 Output voltage vs temperature 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 3.2 -25 Output voltage (V) 4 3 2 1 0 1 2 3 4 5 Output voltage (V) 0 25 50 75 100 125 Input voltage(V) Temperature (C) Line regulation 20 15 10 5 0 -5 -10 -15 -20 Load regulation Load regulation (mV) 30 20 10 0 -10 -20 -30 0 50 100 150 200 250 300 Line regulation (mV) 4 5 6 7 8 9 10 Input voltage (V) Output current (mA) Ripple rejection 100 90 80 70 60 50 40 30 20 10 0 10 Reset Output 5 Rpple rejection (dB) Output voltage (V) 4 3 2 1 0 1 2 3 4 5 100 1000 10000 100000 Frequency (Hz) Input voltage(V) Power Dissipation Power Dissipation (mV) 1000 800 600 400 200 0 0 25 50 75 100 125 150 On board 192 142 1.2tmm Detecting voltage vs temperature 4.3 4.28 4.26 4.24 4.22 4.2 4.18 4.16 4.14 4.12 4.1 -25 Output voltage (V) 0 25 50 75 100 125 Temperature (C) Temperature (C) |
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