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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. 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. regulator2: 60dB typ.
Package
VSOP-8A
Applications
1. CD-ROM drive 2. Optical disc drives
Pin Assignment
8 7 6 5 1 2 3 4 5 6 7 8
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1
2
3
4
VSOP-8A (TOP VIEW)
Cd RESET Vdet VIN VOUT1 VOUT2 GND CONT
Equivalent Circuit Diagram
MITSUMI
Regulator+Reset IC MM1481
Pin Description
Pin No. Pin Name 1 Cd Functions Delay time capacitor pin The delay time of RESET output can be set according to the capacity value connected with Cd tPLH=450000 * C tPLH1: Delay Time [s] C: Cd-capacitance [F] Equivalent circuit diagram
2
RESET RESET -output pin
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RESET pin logic _ _ RESET VdetVS L H
When the voltage of VIN decreases to 1.6V or less, it is likely to become "L" regardless of Vdet voltaege. 3 4 5 6 7 8 Vdet VIN VOUT1 VOUT2 GND CONT Voltage-supply pin (reset) Voltage-supply pin Regulator output pin (150mA) Regulator output pin (100mA) GND pin VOUT1 ON/OFF-control pin VCONT L H VOUT1 OFF ON
Connect cont-terminal with VIN, when it is not used.
Absolute Maximum Ratings
Item Storage temperature Supply voltage Output current 1 Output current 2 Power dissipation Note: Symbol TSTG VIN IOUT1 IOUT2 Pd Ratings -40~+125 -0.3~+10 300 200 550* Unit C V mA mA mW
* When mounted on a (Copper foil area
80%, 100 100 1.6t mm) glass epoxy board.
MITSUMI
Regulator+Reset IC MM1481
Recommended Operating Conditions
Item Operating temperature Output current 1 Output current 2 Operating voltage
(Except where noted otherwise, Ta=25C) Ratings -20~+85 0~150 0~100 0~10 Unit C mA mA V
Symbol TOP IOP1 IOP2 VOP
Electrical Characteristics
Item VIN Input Current 1 VIN Input Current 2 (VOUT1-OFF) Vdet Input Current 1 Regulator 1 (150mA output) Output Voltage Input-Output differential Voltage Line Regulation Load Regulation VOUT Temperature Coefficient 1
(Except where noted otherwise, Ta=25C, VCONT=1.6V) Measurement conditions VIN=5V IOUT1=1OUT2=0mA VIN=5V Vcont=0.4V IOUT2=0mA Vdet=5V VIN=5V IOUT1=30mA VIN=3.4V IOUT1=70mA VIN=4.4V~5.5V IOUT1=30mA VIN=5V IOUT1=0mA~150mA Tj=-20~+80C VIN=5V IOUT1=30mA VIN=5V f=120Hz VRIPPLE=1VP-P, IOUT1=30mA VIN=5V, f=20~80kHz IOUT1=30mA Vcont=1.6V 1.6 -0.3 VIN=5V IOUT2=20mA VIN=3.4V IOUT2=20mA VIN=4.4V~5.5V IOUT2=20mA VIN=5V IOUT2=0mA~100mA Tj=-20~+80C VIN=5V IOUT2=20mA VIN=5V f=120Hz VRIPPLE=1VP-P, IOUT2=20mA VIN=5V, f=20~80kHz IOUT2=20mA 50 3.52 3.60 0.07 10 20 100 60 150 50 3.52 Min. Typ. Max. Unit 2.1 300 20 3.60 0.13 1 20 100 80 100 5 10 VIN+0.3 0.4 3.68 0.14 20 120 4.2 500 40 3.68 0.26 20 120 mA A A V V mV mV ppm/C dB Vrms A V V V V mV mV ppm/C dB Vrms
Symbol Iccq1 Iccq2 Iccq3 VOUT1 ViO V1 V2 VOUT/ T RR
*
Ripple Rejection
*
1
Output Noise Voltage
*1
Vn ION H L VOUT2 Vi0 V1 V2
CONT Terminal Current when ON HIGH Threshold Voltage LOW Threshold Voltage Regulator 2 (100mA output) Output Voltage Input-Output differential Voltage Line Regulation Load Regulation VOUT Temperature Coefficient
*1
VOUT/ T RR Vn
Ripple Rejection
*
1
Output Noise Voltage
*1
Note 1: design guaranteed
MITSUMI
Regulator+Reset IC MM1481
Electrical Characteristics
Part of RESET
Item Detecting Voltage Vs temperature Coefficient Hysteresis Voltage Low-Level Output Voltage Output Leakage Current Output Current when ON 1 Output Current when ON 2
(Typical model MM1481C) (Except where noted otherwise, Ta=25C, VCONT=1.6V) (Except where noted otherwise, resistance unit is )
Symbol VS VS/ T VS VOL IOH IOL IOL tPLH tPLH1 tPHL VOPL
Measurement conditions Vdet=H Vdet=H L L H Ta=-20~+80C
Min. Typ. Max. Unit 4.11 100 100 5 3 30 5 10 30 0.65 90 15 90 0.85 4.20 100 200 200 0.1 4.29 V ppm/C mV mV A mA mA s ms s V
*
Vdet=3.9V RL=4.7k Vdet=5V Vdet=3.9V, RL=0 Vdet=3.9V, RL=0 Ta=-20~+80C Cd Pin open Vdet=4V 5V, Cd=0.22F Cd Pin open VOL=0.4V
* "H" Transmission Delay Time * Reset Delay Time * "L" Transmission Delay Time *
Threshold Operating Voltage Note 1: design guaranteed
Measuring Circuit
Application Circuit
Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (COUT) for stability. Note 2 : Please be careful with regard to set wiring and temperature-related capacitor changes that may cause oscillation.
MITSUMI
Regulator+Reset IC MM1481
Timing Chart
VIN. Vdet
5V Vs Vs
0V
tPLH
RESET 5V
0V
CONT
H
L
VOUT1
5V
0V
VOUT2
5V
0V
MITSUMI
Regulator+Reset IC MM1481
Characteristics
Detection voltage (IOUT=0mA)
5
Output voltage vs temperature
3.7 3.68 3.66 3.64 3.62 3.6 3.58 3.56 3.54 3.52 3.5 -25
Output voltage (V)
Output voltage (V)
VOUT1, 2
4
VOUT1,2
3 2
Reset
1 0 0 1 2 3 4 5
0
25
50
75
100
125
Input voltage (V)
Temperature (C)
Line regulation
20 15 10 5 0 -5 -10 -15 -20
Load regulation
Load regulation (mV)
30 20 10
VOUT1
Line regulation (mV)
VOUT2
0 -10
VOUT2
VOUT1
-20 -30 0 50 100 150 200
4
5
6
7
8
9
10
Input voltage (V)
Output current (mA)
Ripple rejection
100 90 80 70 VOUT2 60 50 40 30 20 10 0 10 100
Detecting voltage vs temperature
Output voltage (V)
VOUT1
1000
10000
100000
4.3 4.28 4.26 4.24 4.22 4.2 4.18 4.16 4.14 4.12 4.1 -25
Rpple rejection (dB)
0
25
50
75
100
125
Frequency (Hz)
Temperature (C)
Allowable loss
1000 On board 100 100 1.6tmm
Allowable loss (mV)
800 600 400 200 0 0 25 50 75 100 125
Temperature (C)

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