NJM2391
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2391 is low dropout voltage regulators
featuring high precision voltage.
It is suitable for Notebook PCs, PC cards and hard
disks where 3.3V need to be generated from 5V supply.
A small TO-252 package is adopted for the space
saving.
FEATURES
Output Current
Io(max.)=1A
High Precision Output Voltage
Vo±1%
Low Dropout Voltage
∆
V
I-O
=1.1V typ. At Io=1A
Internal Excessive Voltage Protection Circuit
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252
PIN CONFIGURATION
2
PACKAGE OUTLINE
NJM2391DL1
PIN FUNCTION
1.V
IN
2.GND
3.V
OUT
1
3
NJM2391DL1
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
+
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
(Ta=25°C)
UNIT
V
W
°C
°C
RATINGS
+10
900(*1)
2500(*2)
−40
~ +85
−50
~ +125
(*1): Mounted on glass epoxy board. (76.2
×
114.3
×
1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm
2
)
(*2): Mounted on glass epoxy board. (76.2
×
114.3
×
1.6mm:based on EIA/JDEC standard, 4Layers)
(For 4Layers: Applying 74.2
×
74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM2391DL1-25 2.5V NJM2391DL1-33
NJM2391DL1-26 2.6V NJM2391DL1-35
NJM2391DL1-28 2.85V NJM2391DL1-05
NJM2391DL1-03 3.0V
V
OUT
3.3V
3.5V
5.0V
NJM2391
ELECTRICAL CHARACTERISTICS (C
IN
=0.1µF, Co=10µF, Tj=25°C)
Measurement is to be conducted is pulse testing
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Vo=2.5V Version
V
O
V
IN
=5.5V, Io=0.01A
2.475
2.5
2.525
V
Output Voltage
50
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=4V~9V, Io=1A
−
−
V
IN
=5. 5V, Io=0~1A
50
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=5.5V, Io=0A
2.3
4.0
mA
−
V
IN
=5.5V, ein=2V
P
-
P
RR
53
63
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=5.5V, Io=0.5A
85
185
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
Vo=2.6V Version
V
O
V
IN
=5.6V, Io=0.01A
2.574
2.60
2.626
V
Output Voltage
52
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=4.1V~9.1V, Io=1A
−
−
V
IN
=5.6V, Io=0~1A
52
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=5.6V, Io=0A
2.3
4.0
mA
−
V
IN
=5.6V, ein=2V
P
-
P
RR
53
63
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=5.6V, Io=0.5A
87
187
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
Vo=2.85V Version
V
O
V
IN
=5.85V, Io=0.01A
2.82
2.85
2.88
V
Output Voltage
57
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=4.35V~9.35V, Io=1A
−
−
V
IN
=5.85V, Io=0~1A
57
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=5.85V, Io=0A
2.3
4.0
mA
−
V
IN
=5.85V, ein=2V
P
-
P
RR
53
63
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=5.85V, Io=0.5A
90
190
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
Vo=3V Version
V
O
V
IN
=6V, Io=0.01A
2.97
3.00
3.03
V
Output Voltage
60
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=4.5V~9.5V, Io=1A
−
−
V
IN
=6V, Io=0~1A
60
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=6V, Io=0A
2.3
4.0
mA
−
V
IN
=6V, ein=2V
P
-
P
RR
52
62
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=6V, Io=0.5A
95
195
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
NJM2391
ELECTRICAL CHARACTERISTICS (C
IN
=0.1µF, Co=10µF, Tj=25°C)
Measurement is to be conducted is pulse testing
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Vo=3.3V Version
V
O
V
IN
=6.3V, Io=0.01A
3.267
3.30
3.333
V
Output Voltage
66
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=4.8V~9.8V, Io=1A
−
−
V
IN
=6.3V, Io=0~1A
66
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=6.3V, Io=0A
2.3
4.0
mA
−
V
IN
=6.3V, ein=2V
P
-
P
RR
52
62
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=6.3V, Io=0.5A
100
200
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
Vo=3.5V Version
V
O
V
IN
=6.5V, Io=0.01A
3.465
3.50
3.535
V
Output Voltage
70
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=5V~10V, Io=1A
−
−
V
IN
=6.5V, Io=0~1A
70
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=6.5V, Io=0A
2.3
4.0
mA
−
V
IN
=6.5V, ein=2V
P
-
P
RR
52
62
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=6.5V, Io=0.5A
105
205
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
Vo=5V Version
V
O
V
IN
=8V, Io=0.01A
4.95
5.00
5.05
V
Output Voltage
60
mV
Line Regulation
∆Vo/∆V
IN
V
IN
=6.5V~9.5V, Io=1A
−
−
V
IN
=8V, Io=0~1A
100
mV
Load Regulation
∆Vo/∆Io
−
−
Quiescent Current
I
Q
V
IN
=8V, Io=0A
2.3
4.0
mA
−
V
IN
=8V, ein=2V
P
-
P
RR
50
60
dB
Ripple Rejection
−
f=120Hz, Io=0.5A
Io=1A
1.1
1.2
V
Dropout Voltage
∆V
I-O
−
V
IN
=8V, Io=0.5A
150
260
µV
V
NO
Output Noise Voltage
−
BW=10Hz~100kHz
NJM2391
TEST CIRCUIT
1.Output Voltage / Line Regulation / Load Regulation
Quiescent Current / Dropout Voltage /
Output Noise Voltage
V
IN
V
OUT
NJM2391
GND
+
10µF
RL
BPF
A
I
IN
V
IN
+
0.1µF
A
I
OUT
V
V
OUT
V.V
V
NO
2.Ripple Rejection
ein=2Vp-p
f=120Hz
+
V
IN
0.1µF
V
IN
NJM2391
GND
V
OUT
+
10µF
RL
A
I
OUT
V.V
eo
RR=20log
10
[ein/eo]
(dB)
*Input Capacitor C
IN
Input Capacitor C
IN
is required to prevent oscillation and reduce power supply ripple for applications
when high power supply impedance or a long power supply line.
Therefore, use the recommended C
IN
value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger
and should connect between GND and V
IN
as shortest path as possible to avoid the problem.
*Output Capacitor C
O
Output capacitor (C
O
) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.
Use of a smaller C
O
may cause excess output noise or oscillation of the regulator due to lack of the
phase compensation.
On the other hand, Use of a larger C
O
reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended C
O
value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between GND and V
OUT
as shortest path as possible for stable operation
In addition, Please choose an appropriate capacitor in considering varied characteristics of capacitor (a
frequency characteristic, a temperature characteristic, and so on) when selecting C
O
.
NJM2391
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2391DL1 PowerDissipation
(Topr=-40~+85°C,Tj=125°C)
3500
Power Dissipation P
D
(mW)
3000
2500
2000
1500
1000
500
0
-50
on 4 layers board
on 2 layers board
-25
0
25
50
75
100
125
Temperature : Ta(°C)
