Regulator+Reset IC MM1478 MITSUMI Regulator+Reset IC Monolithic IC MM1478 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. Rank table Rnak A D F M Regulator output voltage (V) 3.40±0.05 3.30±0.05 3.30±0.05 2.50±0.05 Detection voltage (V) 4.20±0.09 4.20±0.09 3.90±0.09 4.20±0.09 Package SOP-8D Applications CD-ROM drive. Pin Assignment 8 7 6 5 1 2 3 4 SOP-8D (TOP VIEW) 1 2 3 4 5 6 7 8 N. C RESET CONT VIN VOUT N. C GND Cd --------------------------------------------------------------------- Regulator+Reset IC MM1478 MITSUMI Equivalent Circuit Diagram Pin Description Pin No. Pin name 1 Functions N. C --------------------------------------------------------------------- 2 RESET Input voltage detection output Input voltage detection output pin --------------------------------------------------------------------- RESET pin logic 3 CONT _ _ RESET VIN<VS L VIN>VS H Output voltage on/off-control pin VCONT Output L OFF H ON Connect cont-terminal with VIN, when it is not used. 4 VIN 5 VOUT 6 N. C 7 GND 8 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] Equivalent circuit diagram Regulator+Reset IC MM1478 MITSUMI Absolute Maximum Ratings Item Operating temperature Storage temperature Supply voltage Output current Power dissipation Note: * When mounted on a 25 Symbol TOPR TSTG VIN IOUT Pd Ratings -30~+85 -40~+125 -0.3~+10 400 700* Unit °C °C V mA mW 40 1t mm glass epoxy board. Recommended Operating Conditions Item Operating temperature Output current Operating voltage Electrical Characteristics Symbol TOP IOP VOP Ratings -20~+85 0~300 0~10 (Typical model MM1478A) (Except where noted otherwise, Ta=25°C, VCONT=1.6V) (Except where noted otherwise, resistance unit is Ω) Item No-load input current 1 No-load input current 2 Input current (OFF) Regulator Output Voltage Input-Output differential Voltage Line regulation Load regulation VOUT temperature coefficient * Symbol Iccq1 Iccq2 Iccq3 Measurement conditions VIN=5V, IOUT=0mA VIN=4V, IOUT=0mA VIN=5V, VCONT=0.4V VOUT Vi0 V1 V2 VOUT / T Ripple rejection * RR VIN=5V, IOUT=30mA VIN=3.2V, IOUT=150mA VIN=4.4~5.5V, IOUT=30mA VIN=5V, IOUT=0~300mA Tj=-20~+80°C, VIN=5V IOUT=30mA VIN=5V, f=120Hz VRIPPLE=1VP-P, IOUT=30mA VIN=5V, f=20~80kHz IOUT=30mA VCONT=1.6V 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 Note 1: design guaranteed Unit °C mA V Vn ION H L VS VS/ T VS VOL IOH IOL1 IOL2 tPLH tPLH1 tPHL VOPL Min. Typ. Max. Unit 3 8 mA 4 mA 250 µA 3.33 50 3.40 0.15 10 20 VOL=0.4V 4.11 ppm/°C 80 dB 40 120 µVrms 5 10 VIN+0.3 0.4 µA V V 4.20 100 4.29 V ppm/°C mV mV µA mA mA µs ms µs V 100 100 200 200 ±0.1 30 10 30 0.65 90 20 90 0.85 5 3 5 V V mV mV 100 1.6 -0.3 VIN=H L Tj=-20~+80°C VIN=H L H VIN=3.9V, RL=4.7k VIN=5V VIN=3.9V, RL=0 VIN=3.9V, RL=0, Ta=-20~+80°C Cd=0.0µF VIN=4V 5V, Cd=0.1µF 3.47 0.3 20 120 MITSUMI Regulator+Reset IC MM1478 Measuring Circuit Application Circuit Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (COUT) for stability. Regulator+Reset IC MM1478 MITSUMI Timing Chart VIN 5V Vs Vs 0V CONT H L VOUT 5V 0V tPLH1 RESET 5V 0V Regulator+Reset IC MM1478 MITSUMI Characteristics (Typical model MM1478A) Detection voltage (IOUT=0mA) Output voltage vs temperature Output voltage (V) Output voltage (V) 5 4 VOUT 3 2 RESET 1 0 1 2 3 4 5 3.5 3.48 3.46 3.44 3.42 3.4 3.38 3.36 3.34 3.32 3.3 -25 0 25 Input voltage(V) 4 5 6 7 8 9 10 Rpple rejection (dB) Output voltage (V) 100 1000 10000 100000 On board 25 40 1mm Allowable loss (mV) 800 600 400 200 25 300 10 0 -10 -20 -30 0 50 100 150 200 50 75 Temperature (°C) 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 Temperature (°C) Allowable loss 0 250 20 Detecting voltage vs temperature Frequency (Hz) 0 125 Output current (mA) Ripple rejection 1000 100 30 Input voltage (V) 100 90 80 70 60 50 40 30 20 10 0 10 75 Load regulation Load regulation (mV) Line regulation (mV) Line regulation 20 15 10 5 0 -5 -10 -15 -20 50 Temperature (°C) 100 125 100 125