MM1458

MITSUMI Regulator+Reset IC MM1458 Regulator+Reset IC Monolithic IC MM1458 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. Package SOP-7 Applications CD-ROM drive. Pin Assignment 1 7 6 5 2 3 4 1 2 3 4 5 6 SOP-7 7 GND --------------------------------------------------------------------- RESET CONT VIN VOUT GND cd Equivalent Circuit Diagram MITSUMI Regulator+Reset IC MM1458 Pin Description Pin No. Pin name 1 2 GND --------------------------------------------------------------------- Functions GND pin Input voltage detection output pin --------------------------------------------------------------------- Equivalent circuit diagram RESET Input voltage detection output RESET pin logic _ _ RESET L H VINVS 3 CONT Output voltage on/off-control pin VCONT L H Output OFF ON Connect cont-terminal with VIN, when it is not used. VIN VOUT 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 ...