mm1481 Mitsumi Electronics, Corp., mm1481 Datasheet

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mm1481

Manufacturer Part Number
mm1481
Description
Ic For Regulator+reset
Manufacturer
Mitsumi Electronics, Corp.
Datasheet
MITSUMI
MITSUMI
Outline
Features
Package
Applications
Pin Assignment
Equivalent Circuit Diagram
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.
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
1. CD-ROM drive
2. Optical disc drives
IC for Regulator+Reset
Monolithic IC MM1481
8
1
(TOP VIEW)
SOP-8D
7
2
6
3
5
4
300mA max.
regulator1: 80dB typ.
4.2V typ.
1
2
3
4
5
6
7
8
---------------------------------------------------------------------
RESET
CONT
regulator2: 60dB typ.
V
V
GND
IC for Regulator+Reset MM1481
Vdet
V
Cd
OUT
OUT
IN
1
2
July 16, 2002

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mm1481 Summary of contents

Page 1

... Optical disc drives Pin Assignment 8 1 (TOP VIEW) Equivalent Circuit Diagram 300mA max. regulator1: 80dB typ. 4.2V typ SOP-8D IC for Regulator+Reset MM1481 July 16, 2002 regulator2: 60dB typ. Cd --------------------------------------------------------------------- RESET Vdet OUT V 2 OUT GND CONT ...

Page 2

... When mounted on a (Copper foil area 80%, 100 100 1.6 * Functions _ _ RESET L H decreases to 1. OUT1 OFF ON , when Symbol Ratings T -40~+125 STG V -0.3~+ OUT I 2 OUT Pd IC for Regulator+Reset MM1481 Equivalent circuit diagram Unit °C V 300 mA 200 mA 550 mm) glass epoxy board. ...

Page 3

... V2 V =5V I =0mA~100mA IN OUT2 Tj=-20~+80° OUT V = OUT2 V =5V f=120Hz = RIPPLE P-P OUT2 Vn V =5V, f=20~80kHz for Regulator+Reset MM1481 Ratings Unit -20~+85 °C 0~150 mA 0~100 mA 0~10 V =1.6V) CONT Min. Typ. Max. Unit =0mA 2.1 OUT2 =0mA 300 OUT2 20 =30mA 3.52 3.60 =70mA 0.13 =30mA 1 ...

Page 4

... Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (C stability. Note 2 : Please be careful with regard to set wiring and temperature-related capacitor changes that may cause oscillation. (Typical model MM1481C) (Except where noted otherwise, Ta=25°C, V (Except where noted otherwise, resistance unit is Ω) Symbol Measurement conditions ...

Page 5

... MITSUMI Timing Chart V . Vdet RESET 5V 0V CONT OUT OUT for Regulator+Reset MM1481 t PLH ...

Page 6

... Temperature (°C) Output voltage vs temperature 1,2 Reset Load regulation V 1 OUT Detecting voltage vs temperature V 1 OUT 10000 100000 75 100 125 IC for Regulator+Reset MM1481 3.7 3. OUT 3.66 3.64 3.62 3.6 3.58 3.56 3.54 3.52 3.5 - 100 Temperature (° OUT 0 -10 V ...

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