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.2008-11-12
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.2008-11-12
NJM2855
(Ta=25°C)
RATINGS
UNIT
+10
V
1190(*1)
mW
-40
∼
+85
°C
-40
∼
+150
°C
(*1): Mounted on glass epoxy board based on EIA/JEDEC. (114.3x76.2x1.6mm: 2Layers, copper area 100mm
2
)
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%
Input Voltage
V
IN
-
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(*2)
∆V
I−O
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
-
Vo=3.0V Version
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
-
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
TYP. MAX. UNIT
-
+1.0%
V
-
8
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
(*2): The output voltage excludes under 2.1V.
(*3): 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.2008-11-12
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
*4
I
OUT
V
V
OU
(ceramic)
GND
*4
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
*5
0.33µF
NJM2855
GND
*5
1.7V<Vo≤2.6V version: Co=4.7µF
Vo≤1.7V version: Co=10µF
4
Ver.2008-11-12
NJM2855
Input Capacitance C
IN
Input Capacitance C
IN
is required to prevent oscillation and reduce power supply ripple for applications
with high power supply impedance or a long power supply line.
Use the C
IN
value of 0.33µF greater to avoid the problem.
C
IN
should connect between GND and V
IN
as short as possible.
Output Capacitance Co
Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The
capacitance and the equivalent series resistance (ESR) influence stability of the regulator.
If use a smaller Co, it may cause excess output noise or oscillation of the regulator due to lack of the
phase compensation. Therefore, use Co with the recommended capacitance or greater value and
connect between Vo terminal and GND terminal with minimal wiring.
The recommended capacitance depends on the output voltage. Low voltage regulator requires greater
value of the Co. Thus, check the recommended capacitance for each output voltage.
Use of a greater Co reduces output noise and ripple output, and also improves transient response of
the output voltage against rapid load change.
This product is designed to work with any capacitor including a low ESR capacitor for the Co; however,
refer "Equivalent Series Resistance vs. Output Current" and choose suitable capacitor.
TYPICAL CHARACTERISTICS
Ver.2008-11-12
5