mm1478 Mitsumi Electronics, Corp., mm1478 Datasheet

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mm1478

Manufacturer Part Number
mm1478
Description
Ic For Regulator+reset
Manufacturer
Mitsumi Electronics, Corp.
Datasheet

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MITSUMI
MITSUMI
Outline
Features
Rank table
Package
Applications
Pin Assignment
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.
1. Large output current
2. High ripple rejection rate
3. Internal thermal shutdown circuit.
4. Internal current-limiting circuit.
5. Adjustment-free reset detection voltage
6. Easy to set delay time from voltage detection to reset release.
SOP-8D
CD-ROM drive.
Rnak
IC for Regulator+Reset
Monolithic IC MM1478
M
A
D
F
Regulator output voltage (V) Detection voltage (V)
3.40±0.05
3.30±0.05
3.30±0.05
2.50±0.05
8
1
(TOP VIEW)
SOP - 8D
7
2
6
3
5
4
4.20±0.09
4.20±0.09
3.90±0.09
4.20±0.09
300mA max.
80dB typ.
4.2V typ.
1
2
3
4
5
6
7
8
---------------------------------------------------------------------
RESET
CONT
GND
IC for Regulator+Reset MM1478
N. C
V
N. C
V
Cd
OUT
IN
September 9, 2003

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mm1478 Summary of contents

Page 1

... M Package SOP-8D Applications CD-ROM drive. Pin Assignment 8 1 (TOP VIEW) 300mA max. 80dB typ. 4.2V typ. 4.20±0.09 4.20±0.09 3.90±0.09 4.20±0. SOP - for Regulator+Reset MM1478 September 9, 2003 N. C --------------------------------------------------------------------- RESET CONT OUT N. C GND Cd ...

Page 2

... Cd Delay time capacitor pin 8 RESET pin output delay time can be set by the capacitance connected to the Cd pin. t =100000·C PLH t : transmission delay time [s] PLH C: capacitor value [F] Functions _ _ RESET L H Output OFF ON , when for Regulator+Reset MM1478 Equivalent circuit diagram ...

Page 3

... OPR T STG OUT glass epoxy board. Symbol (Typical model MM1478A) (Except where noted otherwise, Ta=25°C, V (Except where noted otherwise, resistance unit is Ω) Symbol Measurement conditions Iccq1 V =5V OUT Iccq2 V =4V OUT Iccq3 V =5V ...

Page 4

... MITSUMI MITSUMI Measuring Circuit Application Circuit Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (C stability. IC for Regulator+Reset MM1478 ) for OUT ...

Page 5

... MITSUMI Timing Chart CONT OUT 5V 0V RESET PLH IC for Regulator+Reset MM1478 ...

Page 6

... Allowable loss On board 25 40 1mm 1000 800 600 400 200 Temperature (°C) Output voltage vs temperature RESET Load regulation Detecting voltage vs temperature 10000 100000 75 100 125 IC for Regulator+Reset MM1478 3.5 3.48 3.46 3.44 3.42 3.4 3.38 3.36 3.34 3.32 3.3 - 100 Temperature (° -10 -20 - ...

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