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MITSUMI
Regulator+Reset IC MM1478
Regulator+Reset IC
Monolithic IC MM1478
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-8D
Applications
Pin Assignment
CD-ROM drive.
1423
7685
SOP-8D
(TOP VIEW)
MITSUMI
1 N. C
2 RESET
---------------------------------------------------------------------
3 CONT
4 V
IN
5 VOUT
6 N. C
7 GND
8 Cd
Rank table
Rnak Regulator output voltage (V) Detection voltage (V)
A 3.40±0.05 4.20±0.09
D 3.30±0.05 4.20±0.09
F 3.30±0.05 3.90±0.09
M 2.50±0.05 4.20±0.09
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Regulator+Reset IC MM1478
Pin Description
MITSUMI
Pin No.
Pin name
Functions Equivalent circuit diagram
1 N. C
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 N. C
7 GND GND pin
8 Cd Delay time capacitor pin
t
PLH=100000·C
t
PLH: transmission delay time [s]
C: capacitor value [F]
__
RESET
V
IN<VS L
V
IN>VS H
VCONT Output
L OFF
HON
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.
Equivalent Circuit Diagram
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Regulator+Reset IC MM1478
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Electrical Characteristics
(Typical model MM1478A) (Except where noted otherwise, Ta=25°C, V
CONT
=1.6V)
(Except where noted otherwise, resistance unit is Ω)
Recommended Operating Conditions
Item Symbol Ratings Unit
Operating temperature T
OP
-
20~+85 °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, IOUT=0mA 3 8 mA
No-load input current 2 Iccq2 V
IN=4V, IOUT=0mA 4 mA
Input current (OFF) Iccq3 V
IN=5V, VCONT=0.4V 250 µA
Regulator
Output Voltage V
OUT VIN=5V, IOUT=30mA 3.33 3.40 3.47 V
Input-Output differential Voltage
Vi0 V
IN=3.2V, IOUT=150mA 0.15 0.3 V
Line regulation V1 V
IN=4.4~5.5V, IOUT=30mA 10 20 mV
Load regulation V2 V
IN=5V, IOUT=0~300mA 20 120 mV
V
OUT temperature VOUT Tj=
-
20~+80°C, VIN=5V
coefficient
*
/ T IOUT=30mA
100
ppm/°C
Ripple rejection
*
RR
V
IN=5V, f=120Hz
50 80 dB
V
RIPPLE=1VP-P, IOUT=30mA
Output noise voltage
*
Vn
V
IN=5V, f=20~80kHz
40 120
µVrms
IOUT=30mA
CONT terminal current I
ON VCONT=1.6V 5 10 µA
High threshold voltage H 1.6
VIN+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~+80°C 100
ppm/°C
Hysteresis voltage VS VIN=H L H 100 200 mV
Low-level output voltage V
OL VIN=3.9V, RL=4.7k 100 200 mV
Output leakage current I
OH VIN=5V ±0.1 µA
Output current 1 I
OL1VIN=3.9V, RL=0 5 mA
Output current 2
*
IOL2VIN=3.9V, RL=0, 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
Note 1: design guaranteed
Absolute Maximum Ratings
Item Symbol Ratings Unit
Operating temperature 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 700
*
mW
Note: *When mounted on a 25 40 1tmm glass epoxy board.
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Regulator+Reset IC MM1478
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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.
Measuring Circuit
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Regulator+Reset IC MM1478
Timing Chart
tPLH1
VIN
VOUT
CONT
5V
Vs
0V
5V
0V
5V
0V
H
L
RESET
Vs
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MITSUMI
Regulator+Reset IC MM1478
MITSUMI
Characteristics
(
Typical
model MM1478A)
Detection voltage (IOUT=0mA)
VOUT
RESET
Input voltage(V)
12345
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
45678910
-
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
Frequency (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
Temperature (°C)
Allowable loss (mV)
On board 25 40 1mm
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