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
V
IN
V
OUT
1
V
OUT
2
GND
CONT
Equivalent Circuit Diagram
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
