MITSMI MM1481 Datasheet
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. regulator2: 60dB 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
VSOP-8A
Applications
Pin Assignment
Equivalent Circuit Diagram
1. CD-ROM drive
2. Optical disc drives
1423
7685
VSOP-8A
(TOP VIEW)
MITSUMI
1 Cd
2 RESET
---------------------------------------------------------------------
3 Vdet
4 V
IN
5 VOUT1
6 V
OUT2
7 GND
8 CONT
MITSUMI
Regulator+Reset IC MM1481
Pin Description
Absolute Maximum Ratings
MITSUMI
Item Symbol Ratings Unit
Storage temperature T
STG
-
40~+125 °C
Supply voltage V
IN
-
0.3~+10 V
Output current 1 I
OUT1 300 mA
Output current 2 I
OUT2 200 mA
Power dissipation Pd 550
*
mW
Note: *When mounted on a (Copper foil area 80%, 100 100 1.6tmm) glass epoxy board.
1 Cd Delay time capacitor pin
The delay time of RESET output can be set
according to the capacity value connected
with Cd
t
PLH=450000 · C
t
PLH1: Delay Time [s]
C: Cd-capacitance [F]
2 RESET RESET
---------------------------------------------------------------------
-output pin
RESET
---------------------------------------------------------------------
pin logic
When the voltage of V
IN decreases to 1.6V
or less, it is likely to become "L" regardless
of Vdet voltaege.
3 Vdet Voltage-supply pin (reset)
4 V
IN Voltage-supply pin
5 V
OUT1 Regulator output pin (150mA)
6 V
OUT2 Regulator output pin (100mA)
7 GND GND pin
8 CONT V
OUT1 ON/OFF-control pin
Connect cont-terminal with V
IN, when it is
not used.
Pin No.
Pin Name
Functions Equivalent circuit diagram
__
RESET
Vdet<VS L
Vdet>VS H
VCONT VOUT1
L OFF
HON
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