MITSUMI
Regulator+Reset IC MM1458
Regulator+Reset IC
Monolithic IC MM1458
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.
Package
SOP-7
Applications
Pin Assignment
Equivalent Circuit Diagram
CD-ROM drive.
1
4
2
3
7
6
5
SOP-7
MITSUMI
1
GND
2
RESET
---------------------------------------------------------------------
3
CONT
4
V
IN
5
V
OUT
6
GND
7
cd
MITSUMI
Regulator+Reset IC MM1458
Pin Description
Absolute Maximum Ratings
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Pin No. Pin name
Functions
Equivalent circuit diagram
1
GND
GND pin
2
RESET
---------------------------------------------------------------------
Input voltage detection output
Input voltage detection output pin
RESET
---------------------------------------------------------------------
pin logic
3
CONT
Output voltage on/off-control pin
4
V
IN
Voltage supply input pin
5
V
OUT
Regulator Output pin
6
GND
GND pin
7
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
V
CONT
Output
L
OFF
H
ON
Connect cont-terminal with V
IN
, when it is
not used.
RESET pin output delay time can be set by
the capacitance connected to the Cd pin.
Item
Symbol
Ratings
Unit
Operating temperature
T
OPR
-20~+80 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
800
*
mW
Note:
*
When mounted on a 25 40 1
t
mm glass epoxy board.
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Regulator+Reset IC MM1458
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Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CONT
=1.6V)
Recommended Operating Conditions
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
Item
Symbol
Measurement conditions
Min. Typ. Max. Unit
No-load input current 1
Iccq1
V
IN
=5V, I
OUT
=0mA
3
8
mA
No-load input current 2
Iccq2
V
IN
=4V, I
OUT
=0mA
4
mA
Input current (OFF)
Iccq3
V
IN
=5V, V
CONT
=0.4V
250
A
Regulator
Output Voltage
V
OUT
V
IN
=5V, I
OUT
=30mA
3.33
3.40
3.47
V
Input-Output differential Voltage
Vi0
V
IN
=3.2V, I
OUT
=150mA
0.15
0.3
V
Line regulation
V1
V
IN
=4.4~5.5V, I
OUT
=30mA
10
20
mV
Load regulation
V2
V
IN
=5V, I
OUT
=0~300mA
20
120
mV
V
OUT
temperature
V
OUT
Tj=-20~+80C, V
IN
=5V
coefficient
*
/ T
I
OUT
=30mA
100
ppm/C
Ripple rejection
*
RR
V
IN
=5V, f=120Hz
50
80
dB
V
RIPPLE
=1V
P-P
, I
OUT
=30mA
Output noise voltage
*
Vn
V
IN
=5V, f=20~80kHz
40
120
Vrms
I
OUT
=30mA, C
N
=0.01F
CONT terminal current
I
ON
V
CONT
=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
Reset
Detection voltage
VS
V
IN
=H L
4.11
4.20
4.29
V
V
S
temperature coefficient
*
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 1
I
OL
V
IN
=3.9V, R
L
=0
5
mA
Output current 2
*
I
OL
V
IN
=3.9V, R
L
=0
, Ta=-20~+80C
3
mA
"H" transmission delay time
*
t
PLH
Cd=0.0F
30
90
S
Reset delay time
t
PLH1
V
IN
=4V 5V, Cd=0.1F
5
10
20
mS
"L" transmission delay time
*
t
PHL
30
90
S
Threshold operating voltage
V
OPL
V
OL
=0.4V
0.65
0.85
V
Note 1: design guaranteed
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Regulator+Reset IC MM1458
MITSUMI
Application Circuit
Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (C
OUT
) for
stability.
Measuring Circuit
MITSUMI
Regulator+Reset IC MM1458
Timing Chart
t
PLH
V
IN
V
OUT
CONT
5V
Vs
0V
5V
0V
5V
0V
H
L
RESET
Vs
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Regulator+Reset IC MM1458
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Characteristics
Detection voltage (I
OUT
=0mA)
V
OUT
RESET
Input voltage(V)
1
2
3
4
5
0
1
2
3
4
5
Output voltage (V)
Output voltage vs temperature
-25
0
25
50
75
100
125
3.3
3.32
3.34
3.36
3.38
3.4
3.42
3.44
3.46
3.48
3.5
Temperature (
C)
Output voltage (V)
Line regulation
4
5
6
7
8
9
10
-20
-15
-10
-5
0
5
10
15
20
Input voltage (V)
Line regulation (mV)
Load regulation
0
50
100
150
200
250
300
-30
-20
-10
0
10
20
30
Output current (mA)
Load regulation (mV)
Ripple rejection
Frequenc (Hz)
10
0
10
20
30
40
50
60
70
80
90
100
100
1000
10000
100000
Rpple rejection (dB)
Detecting voltage vs temperature
-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
Temperature (
C)
Output voltage (V)
Allowable loss
0
25
50
75
100
125
0
200
400
600
800
1000
Temperatuer (
C)
Allowable loss (mV)
On board 25 40 1mm
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