MM1478

www.DataSheet4U.com 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) 3.40±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 5 6 7 8 --------------------------------------------------------------------- 1 2 3 4 SOP-8D (TOP VIEW) N. C RESET CONT VIN VOUT N. C GND Cd www.DataSheet4U.com 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 VINVS 3 CONT Output voltage on/off-control pin VCONT L H Output OFF ON Connect cont-terminal with ...