MITSUMI
Regulator+Reset IC MM1482
Regulator+Reset IC
Monolithic IC MM1482
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.
7. Operating temperature range and ripple elimination rate are available separately for 3 ranks.
Package
SOP-8D
Applications
Pin Assignment
Equivalent Circuit Diagram
1. CD-ROM drive
2. Optical disc drivers
1
4
2
3
7
6
8
5
SOP-8D
(TOP VIEW)
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1
N. C
2
RESET
---------------------------------------------------------------------
3
Cf
4
V
IN
5
V
OUT
6
N. C
7
GND
8
Cd
MITSUMI
Regulator+Reset IC MM1482
Pin Description
Absolute Maximum Ratings
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Pin No. Pin name
Functions
Equivalent circuit diagram
1
N. C
2
RESET
---------------------------------------------------------------------
V
IN
pin voltage detection output
RESET
---------------------------------------------------------------------
pin logic
3
Cf
Ripple-filter pin (RESET)
Please connect a capacitor between Cf-GND
to reject ripple voltage of V
IN
for RESET. It
become C-R low-pass filter. Internal
impedance of Cf is typically 14k
.
4
V
IN
Voltage supply input pin
5
V
OUT
Regulator Output pin
6
N. C
7
GND
GND pin
8
Cd
Delay time capacitor pin
t
PLH
=100000C
t
PLH
: transmission delay time [s]
C: capacitor value [F]
_
_
RESET
V
IN
<VS
L
V
IN
>VS
H
Item
Symbol
Ratings
Unit
Operating temperature
*
1
T
OPR
-30~+85 C
Storage temperature
T
STG
-40~+125
C
Supply voltage
V
IN
-0.3~+10
V
Output current
I
OUT
400
mA
Power dissipation
Pd
400(Alone)
*
mW
950(With board mounted)
*
2
Note1:
*
1 Rank B: -20 ~+80C ; Rank A: -30 ~ +85C
Note2:
*
2 When mounted on a (Copper foil area 80% 192 142 1
t
mm glass epoxy board.
RESET pin output delay time can be set by
the capacitance connected to the Cd pin.
Item
Symbol
Measurement conditions
Min. Typ. Max. Unit
No-Load Input Current
Iccgl
V
IN
=5V I
OUT
=0mA C rank
2.2
4
mA
A, B rank
3.0
6.0
mA
Regulator
Output Voltage
V
OUT
V
IN
=5V I
OUT
=30mA
3.23
3.30
3.37
V
Input-Output differential Voltage
ViO
V
IN
=3.2V I
OUT
=150mA
0.15
0.3
V
Line Regulation
V1
V
IN
=4.4V~5.5V I
OUT
=30mA
0.05
5
mV
Load Regulation
V2
V
IN
=5V I
OUT
=0mA~300mA
20
120
mV
V
OUT
Temperature Coefficient
*
1
V
OUT
/ T
Tj=-20~+80C
V
IN
=5V I
OUT
=30mA
100
ppm/C
V
IN
=5V f=120Hz V
RIPPLE
=1V
P-P
Ripple Rejection
*
1
RR
I
OUT
=30mA C rank
50
80
dB
A, B rank
50
90
dB
V
IN
=5V, f=20~80kHz
Output Noise Voltage
*
1
Vn
I
OUT
=30mA C rank
60
120
Vrms
A, B rank
40
120
Vrms
Reset
Detecting Voltage
Vs
V
IN
=H L
4.11
4.20
4.29
V
Vs temperature Coefficient
*
1
Vs/ T
Tj=20~80C
100
ppm/C
Hysteresis Voltage
Vs
V
IN
=H L H
100
200
mV
Low-Level Output Voltage
V
OL
V
IN
=3.9V R
L
=4.7k
100
200
mV
Output Leakage Current
I
OH
V
IN
=5V
0.1
A
Output Current when ON 1
I
OL
V
IN
=3.9V, R
L
=0
5
mA
Output Current when ON 2
*
1
I
OL
V
IN
=3.9V, R
L
=0 Ta=-20~+80C
3
mA
"H"Transmission Delay Time
*
1
t
PLH
Cd Pin open
30
90
s
Reset Delay Time
*
1
t
PLH1
V
IN
=4V 5V, Cd=0.1F
5
10
20
ms
"L"Transmission Delay Time
*
1
t
PHL
Cd pin open
30
90
s
Threshold Operating Voltage
V
OPL
VOL=0.4V
0.65
0.85
V
Cf terminal impedance
R
CF
V
IN
=5V
14
k
MITSUMI
Regulator+Reset IC MM1482
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Electrical Characteristics
(Typical model 1482C) (Except where noted otherwise, Ta=25C, V
CONT
=1.6V)
(Except where noted otherwise, resistance unit is
)
Recommended Operating Conditions
(Typical model MM1482C) (Except where noted otherwise, Ta=25C)
Item
Symbol
Ratings
Unit
Operating temperature
T
OP
-20~+80 C
Output current
I
OP
0~300
mA
Operating voltage
V
OP
0~10
V
Note 1: design guaranteed
Note1:
*
1 Rank B: -20 ~+80C ; Rank A: -30 ~ +85C
MITSUMI
Regulator+Reset IC MM1482
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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
MITSUMI
Regulator+Reset IC MM1482
Timing Chart
t
PLH
1
Vs
V
IN
.
5V
Vs
0V
V
OUT
5V
0V
5V
0V
RESET
MITSUMI
Regulator+Reset IC MM1482
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Characteristics
(Typical model MM1482C)
Regulator Output
Input voltage(V)
Output voltage (V)
1
2
3
4
5
0
1
2
3
4
5
Output voltage vs temperature
Temperature (
C)
Output voltage (V)
-25
0
25
50
75
100
125
3.2
3.22
3.24
3.26
3.28
3.3
3.32
3.34
3.36
3.38
3.4
Line regulation
Input voltage (V)
Line regulation (mV)
4
5
6
7
8
9
10
-20
-15
-10
-5
0
5
10
15
20
Load regulation
Output current (mA)
Load regulation (mV)
0
50
100
150
200
250
300
-30
-20
-10
0
10
20
30
Ripple rejection
Frequency (Hz)
Rpple rejection (dB)
10
0
10
20
30
40
50
60
70
80
90
100
100
1000
10000
100000
Power Dissipation
Temperature (
C)
Power Dissipation (mV)
On board 192 142 1.2tmm
0
25
50
75
100
125
150
0
200
400
600
800
1000
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
Reset Output
Input voltage(V)
Output voltage (V)
1
2
3
4
5
0
1
2
3
4
5
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