MITSMI MM1482 Datasheet
MITSUMI
Regulator+Reset IC MM1482
Regulator+Reset IC
Monolithic IC MM1482
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.
7. Operating temperature range and ripple elimination rate are available separately for 3 ranks.
Package
SOP-8D
Applications
Pin Assignment
Equivalent Circuit Diagram
1. CD-ROM drive
2. Optical disc drivers
1423
76
85
SOP-8D
(TOP VIEW)
MITSUMI
1 N. C
2 RESET
---------------------------------------------------------------------
3 Cf
4 V
IN
5 VOUT
6 N. C
7 GND
8 Cd
MITSUMI
Regulator+Reset IC MM1482
Pin Description
Absolute Maximum Ratings
MITSUMI
Pin No.
Pin name
Functions Equivalent circuit diagram
1 N. C
2 RESET
---------------------------------------------------------------------
VIN pin voltage detection output
RESET
---------------------------------------------------------------------
pin logic
3 Cf Ripple-filter pin (RESET)
Please connect a capacitor between Cf-GND
to reject ripple voltage of V
IN for RESET. It
become C-R low-pass filter. Internal
impedance of Cf is typically 14kΩ.
4 V
IN Voltage supply input pin
5 V
OUT Regulator Output pin
6 N. C
7 GND GND pin
8 Cd Delay time capacitor pin
t
PLH=100000·C
t
PLH: transmission delay time [s]
C: capacitor value [F]
__
RESET
V
IN<VS L
V
IN>VS H
Item Symbol Ratings Unit
Operating temperature
*
1 TOPR
-
30~+85 °C
Storage temperature T
STG
-
40~+125 °C
Supply voltage V
IN
-
0.3~+10 V
Output current I
OUT 400 mA
Power dissipation Pd
400(Alone)
*
mW
950(With board mounted)
*
2
Note1: *1 Rank B: -20 ~+80°C ; Rank A: -30 ~ +85°C
Note2:
*
2 When mounted on a (Copper foil area 80% 192 142 1tmm glass epoxy board.
RESET pin output delay time can be set by
the capacitance connected to the Cd pin.
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