Regulator+Reset IC MM1481 MITSUMI Regulator+Reset IC Monolithic IC MM1481 Outline This IC was developed for use in CD-ROM drives and other optical disc drives. It combines two 3V system regulator lines and reset (monitors regulator input) with a built-in 4.2V detection delay circuit that responds to market needs. Features 1. Large output current 300mA max. 2. High ripple rejection rate regulator1: 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. regulator2: 60dB typ. Package VSOP-8A Applications 1. CD-ROM drive 2. Optical disc drives Pin Assignment 8 7 6 5 1 2 3 4 VSOP-8A (TOP VIEW) Equivalent Circuit Diagram 1 2 3 4 5 6 7 8 Cd RESET Vdet VIN VOUT1 VOUT2 GND CONT --------------------------------------------------------------------- Regulator+Reset IC MM1481 MITSUMI Pin Description Pin No. Pin Name 1 Cd Functions Equivalent circuit diagram Delay time capacitor pin The delay time of RESET output can be set according to the capacity value connected with Cd tPLH=450000 · C tPLH1: Delay Time [s] C: Cd-capacitance [F] --------------------------------------------------------------------- 2 RESET RESET -output pin --------------------------------------------------------------------- RESET pin logic _ _ RESET Vdet<VS L Vdet>VS H When the voltage of VIN decreases to 1.6V or less, it is likely to become "L" regardless of Vdet voltaege. 3 Vdet Voltage-supply pin (reset) 4 VIN 5 VOUT1 Regulator output pin (150mA) 6 VOUT2 Regulator output pin (100mA) 7 GND GND pin 8 CONT VOUT1 ON/OFF-control pin Voltage-supply pin VCONT VOUT1 L OFF H ON Connect cont-terminal with VIN, when it is not used. Absolute Maximum Ratings Item Storage temperature Supply voltage Output current 1 Output current 2 Power dissipation Note: Symbol TSTG VIN IOUT1 IOUT2 Pd * When mounted on a (Copper foil area Ratings -40~+125 -0.3~+10 300 200 550* Unit °C V mA mA mW 80%, 100 100 1.6t mm) glass epoxy board. Regulator+Reset IC MM1481 MITSUMI Recommended Operating Conditions (Except where noted otherwise, Ta=25°C) Item Symbol Ratings Unit Operating temperature TOP -20~+85 °C Output current 1 IOP1 0~150 mA Output current 2 IOP2 0~100 mA Operating voltage VOP 0~10 V Electrical Characteristics (Except where noted otherwise, Ta=25°C, VCONT=1.6V) Item Symbol Measurement conditions VIN Input Current 1 Iccq1 VIN=5V IOUT1=1OUT2=0mA 2.1 4.2 mA Iccq2 VIN=5V Vcont=0.4V IOUT2=0mA 300 500 µA Iccq3 Vdet=5V 20 40 µA Output Voltage VOUT1 VIN=5V IOUT1=30mA 3.60 3.68 V Input-Output differential Voltage ViO VIN=3.4V IOUT1=70mA 0.13 0.26 V VIN Input Current 2 (VOUT1-OFF) Vdet Input Current 1 Min. Typ. Max. Unit Regulator 1 (150mA output) 3.52 Line Regulation V1 VIN=4.4V~5.5V IOUT1=30mA 1 20 mV Load Regulation V2 VIN=5V IOUT1=0mA~150mA 20 120 mV VOUT/ T Tj=-20~+80°C VIN=5V IOUT1=30mA 100 ppm/°C 80 dB µVrms VOUT Temperature Coefficient 1 * Ripple Rejection * RR 1 VIN=5V f=120Hz VRIPPLE=1VP-P, IOUT1=30mA 50 Vn VIN=5V, f=20~80kHz IOUT1=30mA 100 CONT Terminal Current when ON ION Vcont=1.6V 5 HIGH Threshold Voltage H LOW Threshold Voltage L Output Noise Voltage *1 10 µA 1.6 VIN+0.3 V -0.3 0.4 V 3.60 3.68 V Regulator 2 (100mA output) Output Voltage VOUT2 VIN=5V IOUT2=20mA Input-Output differential Voltage Vi0 VIN=3.4V IOUT2=20mA 0.07 0.14 V 3.52 Line Regulation V1 VIN=4.4V~5.5V IOUT2=20mA 10 20 mV Load Regulation V2 VIN=5V IOUT2=0mA~100mA 20 120 mV VOUT Temperature Coefficient Ripple Rejection *1 1 * Output Noise Voltage *1 Note 1: design guaranteed VOUT/ T RR Vn Tj=-20~+80°C VIN=5V IOUT2=20mA VIN=5V f=120Hz VRIPPLE=1VP-P, IOUT2=20mA VIN=5V, f=20~80kHz IOUT2=20mA 50 100 ppm/°C 60 dB 150 µVrms Regulator+Reset IC MM1481 MITSUMI Electrical Characteristics (Typical model MM1481C) (Except where noted otherwise, Ta=25°C, VCONT=1.6V) (Except where noted otherwise, resistance unit is Ω) Part of RESET Item Symbol Detecting Voltage VS Vs temperature Coefficient * Hysteresis Voltage VS/ T VS Measurement conditions Vdet=H L Min. Typ. Max. Unit 4.11 Ta=-20~+80°C Vdet=H L H 4.20 4.29 100 100 V ppm/°C 200 mV 200 mV ±0.1 µA Low-Level Output Voltage VOL Vdet=3.9V RL=4.7k Output Leakage Current IOH Vdet=5V Output Current when ON 1 IOL Vdet=3.9V, RL=0 5 mA Output Current when ON 2 IOL Vdet=3.9V, RL=0 Ta=-20~+80°C 3 mA tPLH Cd Pin open * "H" Transmission Delay Time * Reset Delay Time * "L" Transmission Delay Time * tPLH1 tPHL Threshold Operating Voltage VOPL 100 30 90 µs 10 15 ms Cd Pin open 30 90 µs VOL=0.4V 0.65 0.85 V Vdet=4V 5V, Cd=0.22µF 5 Note 1: design guaranteed 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. Regulator+Reset IC MM1481 MITSUMI Timing Chart VIN. Vdet 5V Vs Vs 0V RESET 5V 0V CONT H L VOUT1 5V 0V VOUT2 5V 0V tPLH Regulator+Reset IC MM1481 MITSUMI Characteristics Detection voltage (IOUT=0mA) Output voltage vs temperature Output voltage (V) Output voltage (V) 5 4 VOUT1,2 3 2 Reset 1 0 0 1 2 3 4 5 3.7 3.68 3.66 3.64 3.62 3.6 3.58 3.56 3.54 3.52 3.5 -25 VOUT1, 2 0 25 Input voltage (V) VOUT2 VOUT1 4 5 6 7 8 9 10 20 10 VOUT1 0 -10 VOUT2 -20 -30 0 50 1000 10000 100000 Allowable loss (mV) 150 On board 100 100 1.6tmm 800 600 400 200 50 75 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 Temperature (°C) Output voltage (V) Rpple rejection (dB) VOUT1 Frequency (Hz) 25 100 200 Detecting voltage vs temperature 100 90 80 70 VOUT2 60 50 40 30 20 10 0 10 100 0 125 Output current (mA) Ripple rejection 0 100 30 Input voltage (V) 1000 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