NJM2855
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2855 is a 3-terminal low dropout voltage regulator.
Advanced Bipolar technology achieves low noise, high ripple
rejection.
It delivers up to 5V/1A output power with the maximum input
voltage of 10V.
The NJM2855 is suitable for various applications such as
portable / consumer devices.
FEATURES
High Ripple Rejection
75dB typ. (f=1kHz,Vo=3V Version)
Output Noise Voltage
Vno=45µVrms typ.
Output capacitor with 2.2µF ceramic capacitor (Vo≥2.7V)
Output Current
Io (max.)=1A
High Precision Output
Vo±1.0%
Low Dropout Voltage
0.20V typ. (Io=600mA)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252-3
PIN CONFIGURATION
2
PACKAGE OUTLINE
NJM2855DL1
PIN FUNCTION
1.V
IN
2.GND
3.V
OUT
3
1
NJM2855DL1
EQUIVALENT CIRCUIT
V
IN
Thermal
Protection
Bandgap
Reference
V
OUT
GND
Ver.2012-10-24
1
NJM2855
OUTPUT VOLTAGE RANK LIST
The WHITE column shows applicable Voltage Rank(s)
Device Name
NJM2855DL1-15
NJM2855DL1-16
NJM2855DL1-17
NJM2855DL1-18
NJM2855DL1-19
NJM2855DL1-02
NJM2855DL1-21
NJM2855DL1-22
NJM2855DL1-23
NJM2855DL1-24
NJM2855DL1-25
NJM2855DL1-26
NJM2855DL1-27
NJM2855DL1-28
NJM2855DL1-29
NJM2855DL1-03
NJM2855DL1-31
NJM2855DL1-32
NJM2855DL1-33
NJM2855DL1-34
V
out
1.5V
1.6V
1.7V
1.8V
1.9V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
Device Name
NJM2855DL1-35
NJM2855DL1-36
NJM2855DL1-37
NJM2855DL1-38
NJM2855DL1-39
NJM2855DL1-04
NJM2855DL1-41
NJM2855DL1-42
NJM2855DL1-43
NJM2855DL1-44
NJM2855DL1-45
NJM2855DL1-46
NJM2855DL1-47
NJM2855DL1-48
NJM2855DL1-49
NJM2855DL1-05
V
out
3.5V
3.6V
3.7V
3.8V
3.9V
4.0V
4.1V
4.2V
4.3V
4.4V
4.5V
4.6V
4.7V
4.8V
4.9V
5.0V
2
Ver.2012-10-24
NJM2855
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
RATINGS
+10
1190(*1)
3125(*2)
-40
∼
+85
-40
∼
+150
(Ta=25°C)
UNIT
V
mW
°C
°C
(*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)
OPERATING VOLTAGE
V
IN
=+2.5V ~ +8V (In case of Vo<2.3V version)
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.33µF, Co=2.2µF(1.7V<Vo≤2.6V:4.7µF, Vo≤1.7V:10µF), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
Output Voltage
Vo
Io=30mA
-1.0%
Quiescent Current
I
Q
Io=0mA
-
Output Current
Io
Vo-0.3V
1000
V
IN
=Vo+1V~Vo+6V(Vo≤2V),
Line Regulation
-
∆Vo/∆V
IN
V
IN
=Vo+1V~8V(Vo>2V),
Io=30mA
Load Regulation
-
∆Vo/∆Io
Io=0
∼
1A
Io=600mA
-
Dropout Voltage(*3)
∆V
I−O
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
-
Vo=3.0V Version(*4)
Average Temperature
-
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
Coefficient of Output Voltage
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
-
Vo=3.0V Version(*3)
Input Voltage
V
IN
-
TYP. MAX. UNIT
-
+1.0%
V
400
600
µA
1300
-
mA
-
-
0.20
75
±50
45
-
0.10
%/V
0.004 %/mA
0.28
V
-
-
-
8
dB
ppm/°C
µVrms
V
(*3): The output voltage excludes under 2.1V.
(*4): Vo>2.0V : V
IN
=Vo+1V, Vo≤2.0V : V
IN
=3.0V
The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
Ver.2012-10-24
3
NJM2855
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2855DL1 PowerDissipation
(Topr=-40~+85°C,Tj=150°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
Temperature : Ta(°C)
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
0.33µF
NJM2855
2.2µF
*5
I
OUT
V
V
OU
(ceramic)
GND
*5
1.7V<Vo≤2.6V version: Co=4.7µF(ceramic)
Vo≤1.7V version: Co=10µF(ceramic)
TYPICAL APPLICATION
V
IN
V
IN
V
OUT
V
OUT
2.2µF
*6
0.33µF
NJM2855
GND
*6
1.7V<Vo≤2.6V version: Co=4.7µF
Vo≤1.7V version: Co=10µF
4
Ver.2012-10-24
NJM2855
*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
The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator
requires larger C
O
value.
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a
temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor
supplier enough.
When selecting C
O,
recommend that have withstand voltage margin against output voltage and superior
temperature characteristic though this product is designed stability works with wide range ESR of capacitor
including low ESR products.
Ver.2012-10-24
5
PCB设计
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