MM1481

MITSUMI MITSUMI Regulator+Reset IC MM1481 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 5 6 7 8 --------------------------------------------------------------------- 1 2 3 4 VSOP-8A (TOP VIEW) Cd RESET Vdet VIN VOUT1 VOUT2 GND CONT Equivalent Circuit Diagram MITSUMI MITSUMI Regulator+Reset IC MM1481 Pin Description Pin No. Pin Name 1 Cd Functions 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] Equivalent circuit diagram 2 RESET RESET -output pin --------------------------------------------------------------------- --------------------------------------------------------------------- RESET pin logic _ _ RESET VdetVS L H When the voltage of VIN decreases to 1.6V or less, it is likely to become "L" regardless of Vdet voltaege. 3 4 5 6 7 8 Vdet VIN VOUT1 VOUT2 GND CONT Voltage-supply pin (reset) Voltage-supply pin Regulator output pin (150mA) Regulator output pin (100mA) GND pin VOUT1 ON/OFF-control pin VCONT L H VOUT1 OFF 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 Ratings -40~+125 -0.3~+10 300 200 550* Unit °C V mA mA mW * When mounted on a (Copper foil area 80%, 100 100 1.6t mm) glass epoxy board. MITSUMI Regulator+Reset IC MM1481 Recommended Operating Conditions Item Operating temperature Output current 1 Output current 2 Operating voltage (Except where noted otherwise, Ta=25°C) Ratings -20~+85 0~150 0~100 0~10 Unit °C mA mA V Symbol TOP IOP1 IOP2 VOP Electrical Characteristics Item VIN Input Current 1 VIN Input Current 2 (VOUT1-OFF) Vdet Input Current 1 Regulator 1 (150mA output) Output Voltage Input-Output differential Voltage Line Regulation Load Regulation VOUT Temperature Coefficient 1 (Except where noted otherwise, Ta=25°C, VCONT=1.6V) Measurement conditions VIN=5V IOUT1=1OUT2=0mA VIN=5V Vcont=0.4V IOUT2=0mA Vdet=5V VIN=5V IOUT1=30mA VIN=3.4V IOUT1=70mA VIN=4.4V~5.5V IOUT1=30mA VIN=5V IOUT1=0mA~150mA Tj=-20~+80°C VIN=5V IOUT1=30mA VIN=5V f=120Hz VRIPPLE=1VP-P, IOUT1=30mA VIN=5V, f=20~80kHz IOUT1=30mA Vcont=1.6V 1.6 -0.3 VIN=5V IOUT2=20mA VIN=3.4V IOUT2=20mA VIN=4.4V~5.5V IOUT2=20mA VIN=5V IOUT2=0mA~100mA 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 3.52 3.60 0.07 10 20 100 60 150 50 3.52 Min. Typ. Max. Unit 2.1 300 20 3.60 0.13 1 20 100 80 100 5 10 VIN+0.3 0.4 3.68 0.14 20 120 4.2 500 40 3.68 0.26 20 120 mA µA µA V V mV mV ppm/°C dB µVrms µA V V V V mV mV ppm/°C dB µVrms Symbol Iccq1 Iccq2 Iccq3 VOUT1 ViO V1 V2 VOUT/ T RR * Ripple Rejection * 1 Output Noise Voltage *1 Vn ION H L VOUT2 Vi0 V1 V2 CONT Terminal Current when ON HIGH Threshold Voltage LOW Threshold Voltage Regulator 2 (100mA output) Output Voltage Input-Output differential Voltage Line Regulation Load Regulation VOUT Temperature Coefficient *1 VOUT/ T RR Vn Ripple Rejection * 1 Output Noise Voltage *1 Note 1: design guaranteed MITSUMI MITSUMI Regulator+Reset IC MM1481 Electrical Characteristics Part of RESET Item Detecting Voltage Vs temperature Coefficient Hysteresis Voltage Low-Level Output Voltage Output Leakage Current Output Current when ON 1 Output Current when ON 2 (Typical model MM1481C) (Except where noted otherwise, Ta=25°C, VCONT=1.6V) (Except where noted otherwise, resistance unit is Ω) Symbol VS VS/ T VS VOL IOH IOL IOL tPLH tPLH1 tPHL VOPL Measurement conditions Vdet=H Vdet=H L L H Ta=-20~+80°C Min. Typ. Max. Unit 4.11 100 100 5 3 30 5 10 30 0.65 90 15 90 0.85 4.20 100 200 200 ±0.1 4.29 V ppm/°C mV mV µA mA mA µs ms µs V * Vdet=3.9V RL=4.7k Vdet=5V Vdet=3.9V, RL=0 Vdet=3.9V, RL=0 Ta=-20~+80°C Cd Pin open Vdet=4V 5V, Cd=0.22µF Cd Pin open VOL=0.4V * "H" Transmission Delay Time * Reset Delay Time * "L" Transmission Delay Time * Threshold Operating Voltage 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. MITSUMI Regulator+Reset IC MM1481 Timing Chart VIN. Vdet 5V Vs Vs 0V tPLH RESET 5V 0V CONT H L VOUT1 5V 0V VOUT2 5V 0V MITSUMI MITSUMI Regulator+Reset IC MM1481 Characteristics Detection voltage (IOUT=0mA) 5 Output voltage vs temperature 3.7 3.68 3.66 3.64 3.62 3.6 3.58 3.56 3.54 3.52 3.5 -25 Output voltage (V) Output voltage (V) VOUT1, 2 4 VOUT1,2 3 2 Reset 1 0 0 1 2 3 4 5 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 VOUT1 Line regulation (mV) VOUT2 0 -10 VOUT2 VOUT1 -20 -30 0 50 100 150 200 4 5 6 7 8 9 10 Input voltage (V) Output current (mA) Ripple rejection 100 90 80 70 VOUT2 60 50 40 30 20 10 0 10 100 Detecting voltage vs temperature Output voltage (V) VOUT1 1000 10000 100000 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) 0 25 50 75 100 125 Frequency (Hz) Temperature (°C) Allowable loss 1000 On board 100 100 1.6tmm Allowable loss (mV) 800 600 400 200 0 0 25 50 75 100 125 Temperature (°C)