MITSUMI MM1481

Regulator+Reset IC MM1481
MITSUMI
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
VSOP-8A
(TOP VIEW)
Equivalent Circuit Diagram
1
2
3
4
5
6
7
8
Cd
RESET
Vdet
VIN
VOUT1
VOUT2
GND
CONT
---------------------------------------------------------------------
Regulator+Reset IC MM1481
MITSUMI
Pin Description
Pin No. Pin Name
1
Cd
Functions
Equivalent circuit diagram
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]
---------------------------------------------------------------------
2
RESET RESET -output pin
---------------------------------------------------------------------
RESET pin logic
_
_
RESET
Vdet<VS
L
Vdet>VS
H
When the voltage of VIN decreases to 1.6V
or less, it is likely to become "L" regardless
of Vdet voltaege.
3
Vdet
Voltage-supply pin (reset)
4
VIN
5
VOUT1
Regulator output pin (150mA)
6
VOUT2
Regulator output pin (100mA)
7
GND
GND pin
8
CONT
VOUT1 ON/OFF-control pin
Voltage-supply pin
VCONT
VOUT1
L
OFF
H
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
* When mounted on a (Copper foil area
Ratings
-40~+125
-0.3~+10
300
200
550*
Unit
°C
V
mA
mA
mW
80%, 100 100 1.6t mm) glass epoxy board.
Regulator+Reset IC MM1481
MITSUMI
Recommended Operating Conditions
(Except where noted otherwise, Ta=25°C)
Item
Symbol
Ratings
Unit
Operating temperature
TOP
-20~+85
°C
Output current 1
IOP1
0~150
mA
Output current 2
IOP2
0~100
mA
Operating voltage
VOP
0~10
V
Electrical Characteristics
(Except where noted otherwise, Ta=25°C, VCONT=1.6V)
Item
Symbol
Measurement conditions
VIN Input Current 1
Iccq1
VIN=5V IOUT1=1OUT2=0mA
2.1
4.2
mA
Iccq2
VIN=5V Vcont=0.4V IOUT2=0mA
300
500
µA
Iccq3
Vdet=5V
20
40
µA
Output Voltage
VOUT1
VIN=5V IOUT1=30mA
3.60
3.68
V
Input-Output differential Voltage
ViO
VIN=3.4V IOUT1=70mA
0.13
0.26
V
VIN Input Current 2
(VOUT1-OFF)
Vdet Input Current 1
Min. Typ. Max. Unit
Regulator 1 (150mA output)
3.52
Line Regulation
V1
VIN=4.4V~5.5V IOUT1=30mA
1
20
mV
Load Regulation
V2
VIN=5V IOUT1=0mA~150mA
20
120
mV
VOUT/ T
Tj=-20~+80°C VIN=5V IOUT1=30mA
100
ppm/°C
80
dB
µVrms
VOUT Temperature Coefficient 1
*
Ripple Rejection
*
RR
1
VIN=5V f=120Hz
VRIPPLE=1VP-P, IOUT1=30mA
50
Vn
VIN=5V, f=20~80kHz IOUT1=30mA
100
CONT Terminal Current when ON
ION
Vcont=1.6V
5
HIGH Threshold Voltage
H
LOW Threshold Voltage
L
Output Noise Voltage
*1
10
µA
1.6
VIN+0.3
V
-0.3
0.4
V
3.60
3.68
V
Regulator 2 (100mA output)
Output Voltage
VOUT2
VIN=5V IOUT2=20mA
Input-Output differential Voltage
Vi0
VIN=3.4V IOUT2=20mA
0.07
0.14
V
3.52
Line Regulation
V1
VIN=4.4V~5.5V IOUT2=20mA
10
20
mV
Load Regulation
V2
VIN=5V IOUT2=0mA~100mA
20
120
mV
VOUT Temperature Coefficient
Ripple Rejection
*1
1
*
Output Noise Voltage
*1
Note 1: design guaranteed
VOUT/ T
RR
Vn
Tj=-20~+80°C
VIN=5V IOUT2=20mA
VIN=5V f=120Hz
VRIPPLE=1VP-P, IOUT2=20mA
VIN=5V, f=20~80kHz IOUT2=20mA
50
100
ppm/°C
60
dB
150
µVrms
Regulator+Reset IC MM1481
MITSUMI
Electrical Characteristics
(Typical model MM1481C) (Except where noted otherwise, Ta=25°C, VCONT=1.6V)
(Except where noted otherwise, resistance unit is Ω)
Part of RESET
Item
Symbol
Detecting Voltage
VS
Vs temperature Coefficient
*
Hysteresis Voltage
VS/ T
VS
Measurement conditions
Vdet=H
L
Min. Typ. Max. Unit
4.11
Ta=-20~+80°C
Vdet=H
L
H
4.20
4.29
100
100
V
ppm/°C
200
mV
200
mV
±0.1
µA
Low-Level Output Voltage
VOL
Vdet=3.9V RL=4.7k
Output Leakage Current
IOH
Vdet=5V
Output Current when ON 1
IOL
Vdet=3.9V, RL=0
5
mA
Output Current when ON 2
IOL
Vdet=3.9V, RL=0 Ta=-20~+80°C
3
mA
tPLH
Cd Pin open
*
"H" Transmission Delay Time
*
Reset Delay Time
*
"L" Transmission Delay Time
*
tPLH1
tPHL
Threshold Operating Voltage
VOPL
100
30
90
µs
10
15
ms
Cd Pin open
30
90
µs
VOL=0.4V
0.65
0.85
V
Vdet=4V
5V, Cd=0.22µF
5
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.
Regulator+Reset IC MM1481
MITSUMI
Timing Chart
VIN. Vdet
5V
Vs
Vs
0V
RESET 5V
0V
CONT
H
L
VOUT1
5V
0V
VOUT2
5V
0V
tPLH
Regulator+Reset IC MM1481
MITSUMI
Characteristics
Detection voltage (IOUT=0mA)
Output voltage vs temperature
Output voltage (V)
Output voltage (V)
5
4
VOUT1,2
3
2
Reset
1
0
0
1
2
3
4
5
3.7
3.68
3.66
3.64
3.62
3.6
3.58
3.56
3.54
3.52
3.5
-25
VOUT1, 2
0
25
Input voltage (V)
VOUT2
VOUT1
4
5
6
7
8
9
10
20
10
VOUT1
0
-10
VOUT2
-20
-30
0
50
1000
10000
100000
Allowable loss (mV)
150
On board 100 100 1.6tmm
800
600
400
200
50
75
4.3
4.28
4.26
4.24
4.22
4.2
4.18
4.16
4.14
4.12
4.1
-25
0
25
50
75
Temperature (°C)
Allowable loss
Temperature (°C)
Output voltage (V)
Rpple rejection (dB)
VOUT1
Frequency (Hz)
25
100
200
Detecting voltage vs temperature
100
90
80
70
VOUT2
60
50
40
30
20
10
0
10
100
0
125
Output current (mA)
Ripple rejection
0
100
30
Input voltage (V)
1000
75
Load regulation
Load regulation (mV)
Line regulation (mV)
Line regulation
20
15
10
5
0
-5
-10
-15
-20
50
Temperature (°C)
100
125
100
125