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. regulator2: 60dB 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.
Package
VSOP-8A
Applications
Pin Assignment
Equivalent Circuit Diagram
1. CD-ROM drive
2. Optical disc drives
1
4
2
3
7
6
8
5
VSOP-8A
(TOP VIEW)
MITSUMI
1
Cd
2
RESET
---------------------------------------------------------------------
3
Vdet
4
V
IN
5
V
OUT
1
6
V
OUT
2
7
GND
8
CONT
MITSUMI
Regulator+Reset IC MM1481
Pin Description
Absolute Maximum Ratings
MITSUMI
Item
Symbol
Ratings
Unit
Storage temperature
T
STG
-40~+125
C
Supply voltage
V
IN
-0.3~+10
V
Output current 1
I
OUT
1
300
mA
Output current 2
I
OUT
2
200
mA
Power dissipation
Pd
550
*
mW
Note:
*
When mounted on a (Copper foil area 80%, 100 100 1.6
t
mm) glass epoxy board.
1
Cd
Delay time capacitor pin
The delay time of RESET output can be set
according to the capacity value connected
with Cd
t
PLH
=450000 C
t
PLH1
: Delay Time [s]
C: Cd-capacitance [F]
2
RESET RESET
---------------------------------------------------------------------
-output pin
RESET
---------------------------------------------------------------------
pin logic
When the voltage of V
IN
decreases to 1.6V
or less, it is likely to become "L" regardless
of Vdet voltaege.
3
Vdet
Voltage-supply pin (reset)
4
V
IN
Voltage-supply pin
5
V
OUT1
Regulator output pin (150mA)
6
V
OUT2
Regulator output pin (100mA)
7
GND
GND pin
8
CONT
V
OUT1
ON/OFF-control pin
Connect cont-terminal with V
IN
, when it is
not used.
Pin No. Pin Name
Functions
Equivalent circuit diagram
_
_
RESET
Vdet<VS
L
Vdet>VS
H
V
CONT
V
OUT1
L
OFF
H
ON
Item
Symbol
Measurement conditions
Min. Typ. Max. Unit
V
IN
Input Current 1
Iccq1
V
IN
=5V I
OUT1
=1
OUT2
=0mA
2.1
4.2
mA
V
IN
Input Current 2
Iccq2
V
IN
=5V Vcont=0.4V I
OUT2
=0mA
300
500
A
(V
OUT1
-OFF)
Vdet Input Current 1
Iccq3
Vdet=5V
20
40
A
Regulator 1 (150mA output)
Output Voltage
V
OUT1
V
IN
=5V I
OUT1
=30mA
3.52
3.60
3.68
V
Input-Output differential Voltage
ViO
V
IN
=3.4V I
OUT1
=70mA
0.13
0.26
V
Line Regulation
V1
V
IN
=4.4V~5.5V I
OUT1
=30mA
1
20
mV
Load Regulation
V2
V
IN
=5V I
OUT1
=0mA~150mA
20
120
mV
V
OUT
Temperature Coefficient
*
1
V
OUT
/ T
Tj=-20~+80C V
IN
=5V I
OUT1
=30mA
100
ppm/C
Ripple Rejection
*
1
RR
V
IN
=5V f=120Hz
V
RIPPLE
=1V
P-P
, I
OUT1
=30mA
50
80
dB
Output Noise Voltage
*
1
Vn
V
IN
=5V, f=20~80kHz I
OUT1
=30mA
100
Vrms
CONT Terminal Current when ON
I
ON
Vcont=1.6V
5
10
A
HIGH Threshold Voltage
H
1.6
V
IN
+0.3
V
LOW Threshold Voltage
L
-0.3
0.4
V
Regulator 2 (100mA output)
Output Voltage
V
OUT2
V
IN
=5V I
OUT2
=20mA
3.52
3.60
3.68
V
Input-Output differential Voltage
Vi0
V
IN
=3.4V I
OUT2
=20mA
0.07
0.14
V
Line Regulation
V1
V
IN
=4.4V~5.5V I
OUT2
=20mA
10
20
mV
Load Regulation
V2
V
IN
=5V I
OUT2
=0mA~100mA
20
120
mV
V
OUT
Temperature Coefficient
*
1
V
OUT
/ T
Tj=-20~+80C
V
IN
=5V I
OUT2
=20mA
100
ppm/C
Ripple Rejection
*
1
RR
V
IN
=5V f=120Hz
V
RIPPLE
=1V
P-P
, I
OUT2
=20mA
50
60
dB
Output Noise Voltage
*
1
Vn
V
IN
=5V, f=20~80kHz I
OUT2
=20mA
150
Vrms
MITSUMI
Regulator+Reset IC MM1481
MITSUMI
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CONT
=1.6V)
Recommended Operating Conditions
(Except where noted otherwise, Ta=25C)
Item
Symbol
Ratings
Unit
Operating temperature
T
OP
-20~+85 C
Output current 1
I
OP
1
0~150
mA
Output current 2
I
OP
2
0~100
mA
Operating voltage
V
OP
0~10
V
Note 1: design guaranteed
MITSUMI
Regulator+Reset IC MM1481
MITSUMI
Application Circuit
Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (C
OUT
) for
stability.
Note 2 : Please be careful with regard to set wiring and temperature-related capacitor changes that may cause
oscillation.
Measuring Circuit
Item
Symbol
Measurement conditions
Min. Typ. Max. Unit
Detecting Voltage
VS
Vdet=H L
4.11
4.20
4.29
V
Vs temperature Coefficient
*
VS/ T
Ta=-20~+80C
100
ppm/C
Hysteresis Voltage
VS
Vdet=H L H
100
200
mV
Low-Level Output Voltage
V
OL
Vdet=3.9V R
L
=4.7k
100
200
mV
Output Leakage Current
I
OH
Vdet=5V
0.1
A
Output Current when ON 1
I
OL
Vdet=3.9V, R
L
=0
5
mA
Output Current when ON 2
*
I
OL
Vdet=3.9V, R
L
=0 Ta=-20~+80C
3
mA
"H" Transmission Delay Time
*
t
PLH
Cd Pin open
30
90
s
Reset Delay Time
*
t
PLH1
Vdet=4V 5V, Cd=0.22F
5
10
15
ms
"L" Transmission Delay Time
*
t
PHL
Cd Pin open
30
90
s
Threshold Operating Voltage
V
OPL
V
OL
=0.4V
0.65
0.85
V
Electrical Characteristics
(Typical model MM1481C) (Except where noted otherwise, Ta=25C, V
CONT
=1.6V)
(Except where noted otherwise, resistance unit is
)
Part of RESET
Note 1: design guaranteed
MITSUMI
Regulator+Reset IC MM1481
Timing Chart
t
PLH
Vs
V
IN
. Vdet
V
OUT
1
CONT
5V
Vs
0V
5V
0V
V
OUT
2
5V
0V
5V
0V
H
L
RESET
MITSUMI
Regulator+Reset IC MM1481
MITSUMI
Characteristics
Detection voltage (I
OUT
=0mA)
Input voltage (V)
0
1
2
3
4
5
Output voltage (V)
V
OUT
1,2
Reset
1
2
3
4
5
0
0
1
2
3
4
5
Output voltage vs temperature
Temperature (
C)
Output voltage (V)
-25
0
25
50
75
100
125
3.5
3.52
3.54
3.56
3.58
3.6
3.62
3.64
3.66
3.68
3.7
V
OUT
1, 2
Line regulation
Input voltage (V)
Line regulation (mV)
4
5
6
7
8
9
10
-20
-15
-10
-5
0
5
10
15
20
V
OUT
2
V
OUT
1
Load regulation
Output current (mA)
Load regulation (mV)
0
50
100
150
200
-30
-20
-10
0
10
20
30
V
OUT
1
V
OUT
2
Ripple rejection
Frequency (Hz)
Rpple rejection (dB)
10
0
10
20
30
40
50
60
70
80
90
100
100
1000
10000
100000
V
OUT
2
V
OUT
1
Detecting voltage vs temperature
Temperature (
C)
Output voltage (V)
-25
0
25
50
75
100
125
4.1
4.12
4.14
4.16
4.18
4.2
4.22
4.24
4.26
4.28
4.3
Allowable loss
Temperature (
C)
Allowable loss (mV)
On board 100 100 1.6tmm
0
25
50
75
100
125
0
200
400
600
800
1000
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