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MITSUMI
1423
765
SOP-7
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
CD-ROM drive.
Pin Assignment
Equivalent Circuit Diagram
1 GND
2 RESET
3 CONT
4 V
5 VOUT
6 GND
7 cd
---------------------------------------------------------------------
IN
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Pin Description
Regulator+Reset IC MM1458
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
__
RESET
V
IN<VS L
V
IN>VS H
3 CONT Output voltage on/off-control pin
VCONT Output
L OFF
HON
Connect cont-terminal with VIN, when it is
not used.
4 V
5 V
IN Voltage supply input pin
OUT Regulator Output pin
6 GND GND pin
7 Cd Delay time capacitor pin
RESET pin output delay time can be set by
the capacitance connected to the Cd pin.
t
PLH=100000·C
t
PLH: transmission delay time [S]
C: capacitor value [F]
Absolute Maximum Ratings
Item Symbol Ratings Unit
Operating temperature T
Storage temperature T
Supply voltage V
Output current I
OPR
STG
IN
OUT 400 mA
-
20~+80 °C
-
40~+125 °C
-
0.3~+10 V
Power dissipation Pd 800
Note: *When mounted on a 25 40 1tmm glass epoxy board.
*
mW
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Recommended Operating Conditions
Item Symbol Ratings Unit
Regulator+Reset IC MM1458
Operating temperature T
Output current I
Operating voltage V
Electrical Characteristics
(Except where noted otherwise, Ta=25°C, VCONT=1.6V)
Item Symbol Measurement conditions Min. Typ. Max. Unit
No-load input current 1 Iccq1 V
No-load input current 2 Iccq2 V
Input current (OFF) Iccq3 V
Regulator
Output Voltage V
Input-Output differential Voltage
OUT VIN=5V, IOUT=30mA 3.33 3.40 3.47 V
Vi0 VIN=3.2V, IOUT=150mA 0.15 0.3 V
Line regulation V1 V
Load regulation V2 V
V
OUT temperature VOUT Tj=
coefficient
*
Ripple rejection
*
/ T IOUT=30mA
RR
OP
OP 0~300 mA
OP 0~10 V
IN=5V, IOUT=0mA 3 8 mA
IN=4V, IOUT=0mA 4 mA
IN=5V, VCONT=0.4V 250 µA
IN=4.4~5.5V, IOUT=30mA 10 20 mV
IN=5V, IOUT=0~300mA 20 120 mV
-
20~+80°C, VIN=5V
-
20~80 °C
100
V
IN=5V, f=120Hz
50 80 dB
RIPPLE=1VP-P, IOUT=30mA
V
ppm/°C
V
Output noise voltage
*
CONT terminal current I
Vn
ON VCONT=1.6V 5 10 µA
High threshold voltage H 1.6
Low threshold voltage L
IN=5V, f=20~80kHz
IOUT=30mA, CN=0.01µF
40 120
VIN+0.3
-
0.3 0.4 V
µVrms
Reset
Detection voltage VS V
V
S temperature coefficient
VS/ T Tj=-20~80°C 100
*
IN=H L 4.11 4.20 4.29 V
ppm/°C
Hysteresis voltage VS VIN=H L H 100 200 mV
Low-level output voltage V
Output leakage current I
Output current 1 I
Output current 2
*
OL VIN=3.9V, RL=4.7kΩ 100 200 mV
OH VIN=5V ±0.1 µA
OL VIN=3.9V, RL=0Ω 5mA
IOL VIN=3.9V, RL=0Ω, Ta=
-
20~+80°C 3 mA
"H" transmission delay time *tPLH Cd=0.0µF 30 90 µS
Reset delay time t
PLH1 VIN=4V 5V, Cd=0.1µF 5 10 20 mS
"L" transmission delay time *tPHL 30 90 µS
Threshold operating voltage
VOPL VOL=0.4V 0.65 0.85 V
V
Note 1: design guaranteed
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Measuring Circuit
Application Circuit
Regulator+Reset IC MM1458
Note 1 : This regulator is not internally compensated and thus requires an external output-capacitor (C
stability.
OUT
) for
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tPLH
VIN
VOUT
CONT
5V
Vs
0V
5V
0V
5V
0V
H
L
RESET
Vs
Timing Chart
Regulator+Reset IC MM1458
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VOUT
RESET
Input voltage(V)
12345
0
1
2
3
4
5
Output voltage (V)
-
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)
45678910
-
20
-
15
-
10
-
5
0
5
10
15
20
Input voltage (V)
Line regulation (mV)
0 50 100 150 200 250 300
-
30
-
20
-
10
0
10
20
30
Output current (mA)
Load regulation (mV)
Frequenc (Hz)
10
0
10
20
30
40
50
60
70
80
90
100
100 1000 10000 100000
Rpple rejection (dB)
-
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)
0 25 50 75 100 125
0
200
400
600
800
1000
Temperatuer (°C)
Allowable loss (mV)
On board 25 40 1mm
MITSUMI
Characteristics
Regulator+Reset IC MM1458
Detection voltage (IOUT=0mA)
Line regulation
Output voltage vs temperature
Load regulation
Ripple rejection
Allowable loss
Detecting voltage vs temperature
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