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| MITSUMI Regulator+Reset IC MM1478 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) 3.400.05 3.300.05 3.300.05 2.500.05 Detection voltage (V) 4.200.09 4.200.09 3.900.09 4.200.09 Package SOP-8D Applications CD-ROM drive. 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 CONT VIN VOUT N. C GND Cd MITSUMI Regulator+Reset IC MM1478 Equivalent Circuit Diagram Pin Description Pin No. Pin name 1 2 N. C --------------------------------------------------------------------- Functions Equivalent circuit diagram RESET Input voltage detection output Input voltage detection output pin --------------------------------------------------------------------- RESET pin logic _ _ RESET L H VIN Output voltage on/off-control pin VCONT L H Output OFF ON Connect cont-terminal with VIN, when it is not used. 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] Voltage supply input pin Regulator Output pin 4 5 6 7 8 MITSUMI Regulator+Reset IC MM1478 Absolute Maximum Ratings Item Operating temperature Storage temperature Supply voltage Output current Power dissipation Note: Symbol TOPR TSTG VIN IOUT Pd Ratings -30~+85 -40~+125 -0.3~+10 400 700* Unit C C V mA mW * When mounted on a 25 40 1t mm glass epoxy board. Recommended Operating Conditions Item Operating temperature Output current Operating voltage Symbol TOP IOP VOP Ratings -20~+85 0~300 0~10 Unit C mA V Electrical Characteristics 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 * Ripple rejection * Output noise voltage (Typical model MM1478A) (Except where noted otherwise, Ta=25C, VCONT=1.6V) (Except where noted otherwise, resistance unit is ) Symbol Iccq1 Iccq2 Iccq3 VOUT Vi0 V1 V2 VOUT /T RR Measurement conditions VIN=5V, IOUT=0mA VIN=4V, IOUT=0mA VIN=5V, VCONT=0.4V VIN=5V, IOUT=30mA VIN=3.2V, IOUT=150mA VIN=4.4~5.5V, IOUT=30mA VIN=5V, IOUT=0~300mA Tj=-20~+80C, VIN=5V IOUT=30mA VIN=5V, f=120Hz VRIPPLE=1VP-P, IOUT=30mA VIN=5V, f=20~80kHz IOUT=30mA VCONT=1.6V Min. Typ. Max. Unit 3 8 mA 4 mA 250 A 3.33 3.40 0.15 10 20 100 50 80 40 5 1.6 -0.3 120 10 VIN+0.3 0.4 4.29 200 200 0.1 3.47 0.3 20 120 V V mV mV ppm/C dB Vrms A V V V ppm/C mV mV A mA mA s ms s V * Vn ION H L VS VS/ T VS VOL IOH IOL1 IOL2 tPLH tPLH1 tPHL VOPL 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 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=0.0F VIN=4V 5V, Cd=0.1F VOL=0.4V 4.11 100 4.20 100 100 5 3 5 30 10 30 0.65 90 20 90 0.85 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. MITSUMI Regulator+Reset IC MM1478 Timing Chart VIN 5V Vs Vs 0V CONT H L VOUT 5V 0V tPLH1 RESET 5V 0V MITSUMI Regulator+Reset IC MM1478 Characteristics (Typical model MM1478A) Detection voltage (IOUT=0mA) 5 Output voltage vs temperature 3.5 3.48 3.46 3.44 3.42 3.4 3.38 3.36 3.34 3.32 3.3 -25 Output voltage (V) 4 VOUT 3 2 RESET 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 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 Rpple rejection (dB) Output voltage (V) 100 1000 10000 100000 0 25 50 75 100 125 Frequency (Hz) Temperature (C) Allowable loss 1000 On board 25 40 1mm Allowable loss (mV) 800 600 400 200 0 0 25 50 75 100 125 Temperature (C) |
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