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Regulator+Reset IC MM1478
Regulator+Reset IC
Monolithic IC MM1478
Outline
This IC, develo...
www.DataSheet4U.com MITSUMI
Regulator+Reset IC MM1478
Regulator+Reset IC
Monolithic IC MM1478
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.
Rank table
Rnak A D F M Regulator output
voltage (V) 3.40±0.05 3.30±0.05 3.30±0.05 2.50±0.05 Detection
voltage (V) 4.20±0.09 4.20±0.09 3.90±0.09 4.20±0.09
Package
SOP-8D
Applications
CD-ROM drive.
Pin Assignment
8 7 6 5 1 2 3 4 5 6 7 8
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1
2
3
4
SOP-8D (TOP VIEW)
N. C RESET CONT VIN VOUT N. C GND Cd
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Regulator+Reset IC MM1478
Equivalent Circuit Diagram
Pin Description
Pin No. Pin name 1 2 N. C
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Functions
Equivalent circuit diagram
RESET Input
voltage detection output Input
voltage detection output pin
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RESET pin logic
_ _ RESET L H
VIN
VS 3 CONT
Output voltage on/off-control pin VCONT L H Output OFF ON
Connect cont-terminal with ...