NJM2878
Low Dropout Voltage Regulator
GENERAL DESCRIPTION
The NJM2878 is a 150mA output low dropout voltage regulator
with ON/OFF control.
Advanced bipolar technology achieves low noise, high ripple
rejection, high accuracy and low quiescent current.
Small packaging (SC-88A/SC82AB) and very small packaging
(ESON4), 0.47µF small decoupling capacitor and built-in noise
bypass capacitor make the NJM2878 suitable for space conscious
applications.
PACKAGE OUTLINE
NJM2878F3
NJM2878F4
NJM2878KF1
FEATURES
High Ripple Rejection
75dB typ. (f=1kHz Vo=3V version)
Output Noise Voltage
Vno=45µVrms typ.
Output capacitor with 0.47µF ceramic capacitor(Vo≥2.7V Version)
Output Current
Io(max.)=150mA
High Precision Output
Vo
±1.0%
Low Dropout Voltage
0.10V typ. (Io=60mA)
ON/OFF Control
(Active High)
Internal Thermal Overload Protection
Internal Over Current Protection
Bipolar Technology
Package Outline
SC88A(NJM2878F3) / SC82AB(NJM2878F4) ) / ESON4-F1(NJM2878KF1)
PIN CONFIGURATION
5
4
1 2 3
1.
2.
3.
4.
5.
CONTROL
GND
NC
V
OUT
V
IN
4
3
1
2
1.
2.
3.
4.
CONTROL
GND
V
OUT
V
IN
4 3
1.
2.
3.
4.
V
OUT
GND
CONTROL
V
IN
1 2
NJM2878F3
EQUIVALENT CIRCUIT
V
IN
Control
NJM2878F4
NJM2878KF1
V
OUT
Thermal
Protection
Bandgap
Reference
GND
Ver.2010-06-02
-1-
NJM2878
OUTPUT VOLTAGE RANK LIST
The WHITE column shows applicable Voltage Rank(s)
Device Name
NJM2878F3/F4-15
NJM2878F3/F4-16
NJM2878F3/F4-17
NJM2878F3/F4-18
NJM2878F3/F4-19
NJM2878F3/F4-02
NJM2878F3/F4-21
NJM2878F3/F4-22
NJM2878F3/F4-23
NJM2878F3/F4-24
NJM2878F3/F4-25
NJM2878F3/F4-26
NJM2878F3/F4-27
NJM2878F3/F4-28
NJM2878F3/F4-29
NJM2878F3/F4-03
NJM2878F3/F4-31
NJM2878F3/F4-32
NJM2878F3/F4-33
NJM2878F3/F4-34
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
NJM2878F3/F4-35
NJM2878F3/F4-36
NJM2878F3/F4-37
NJM2878F3/F4-38
NJM2878F3/F4-39
NJM2878F3/F4-04
NJM2878F3/F4-41
NJM2878F3-42
NJM2878F3-43
NJM2878F3/F4-44
NJM2878F3/F4-45
NJM2878F3/F4-46
NJM2878F3/F4-47
NJM2878F3/F4-48
NJM2878F3/F4-49
NJM2878F3/F4-05
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
The WHITE column shows applicable Voltage Rank(s)
Device Name
NJM2878KF1-15
NJM2878KF1-16
NJM2878KF1-17
NJM2878KF1-18
NJM2878KF1-19
NJM2878KF1-02
NJM2878KF1-21
NJM2878KF1-22
NJM2878KF1-23
NJM2878KF1-24
NJM2878KF1-25
NJM2878KF1-26
NJM2878KF1-27
NJM2878KF1-28
NJM2878KF1-29
NJM2878KF1-03
NJM2878KF1-31
NJM2878KF1-32
NJM2878KF1-33
NJM2878KF1-34
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
NJM2878KF1-35
NJM2878KF1-36
NJM2878KF1-37
NJM2878KF1-38
NJM2878KF1-39
NJM2878KF1-04
NJM2878KF1-41
NJM2878KF1-42
NJM2878KF1-43
NJM2878KF1-44
NJM2878KF1-45
NJM2878KF1-46
NJM2878KF1-47
NJM2878KF1-48
NJM2878KF1-49
NJM2878KF1-05
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
NJM2878
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
RATINGS
+10
+10
SC88A/SC82AB 250(*1)
150(*2)
ESON4
800(*3)
−40 ∼
+85
−40 ∼
+125
(Ta=25°C)
UNIT
V
V
mW
°C
°C
(*1): Mounted on glass epoxy board based on EIA/JEDEC. (114.3
×
76.2
×
1.6mm: 2Layers FR-4)
(*2): Mounted on glass epoxy board based on EIA/JEDEC STANDARD. (101.5×114.5×1.6mm: 2Layers FR-4)
(*3): Mounted on glass epoxy board based on EIA/JEDEC STANDARD. (101.5
×
114.5
×
1.6mm: 4Layers FR-4,
Internal foil area size: 99.5
×
99.5mm, Applying a thermal via hole to a board based on JEDEC standard JESD51-5)
Operating voltage
V
IN
=+2.3
∼
+9V (In case of Vo<2.1V version)
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.1µF, Co=0.47µF: Vo≥2.7V (Co=1.0µF : 1.8V<Vo≤2.6V, Co=2.2µF : Vo≤1.8V), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX. UNIT
Output Voltage
Vo
Io=30mA
-1.0%
+1.0%
V
−
Quiescent Current
I
Q
Io=0mA, except Icont
140
195
µA
−
Quiescent Current
V
CONT
=0V
100
nA
I
Q(OFF)
−
−
at Control OFF
Output Current
Io
Vo - 0.3V
150
200
mA
−
V
IN
=Vo+1V
∼
Vo+6V(Vo≤3V),
0.10
%/V
Line Regulation
∆Vo/∆V
IN
−
−
V
IN
=Vo+1V
∼
9V(Vo>3V), Io=30mA
Load Regulation
0.016 %/mA
∆Vo/∆Io
Io=0
∼
100mA
−
−
Dropout Voltage (*4)
Io=60mA
0.10
0.18
V
∆V
I−O
−
ein=200mVrms, f=1kHz, Io=10mA,
Ripple Rejection
RR
75
dB
−
−
Vo=3V version
Average Temperature
∆Vo/∆Ta
Ta=0
∼
+85°C, Io=10mA
±
50
ppm/°C
−
−
Coefficient of Output Voltage
Output Noise Voltage
V
NO1
45
µVrms
f=10Hz∼80kHz, Io=10mA, Vo=3V Version
−
−
Control Current
I
CONT
V
CONT
=1.6V
3
12
µA
−
Control Voltage for ON-state
V
CONT(ON)
1.6
V
−
−
Control Voltage for OFF-state V
CONT(OFF)
0.6
V
−
−
Input Voltage
V
IN
−
−
9
V
(*4): The output voltage excludes under 2.1V.
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.2010-06-02
-3-
NJM2878
TEST CIRCUIT
I
IN
A
V
IN
V
IN
V
OUT
I
OUT
0.1µF
NJM2878
0.47µF
(ceramic)
*5
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
*5 : 1.8V<Vo
≤
2.6V version: Co=1.0µF(Ceramic)
Vo
≤
1.8V version: Co=2.2µF(Ceramic)
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
IN
V
IN
0.1µF
V
OUT
V
OUT
NJM2878
R
CONTROL
GND
0.47µF
*6
*6 : 1.8V<Vo
≤
2.6V version: Co=1.0µF
Vo
≤
1.8V version: Co=2.2µF
Connect control terminal to V
IN
terminal
NJM2878
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
V
OUT
0.1µF
R
NJM2878
0.47µF
*6
CONTROL
GND
*6 : 1.8V<Vo
≤
2.6V version: Co=1.0µF
Vo
≤
1.8V version: Co=2.2µF
State of control terminal:
•“H”→
output is enabled.
•“L”
or “open”
→
output is disabled.
*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.
You should use the C
IN
value of 0.1µF larger to avoid the problem.
C
IN
should connect between GND and V
IN
as
shortest path
as possible.
*In the case of using a resistance "R" between V
IN
and control.
The current flow into the control terminal while the IC is ON state (I
CONT
) can be reduced when a pull up resistance
"R" is inserted between V
IN
and the control terminal.
The minimum control voltage for ON state (V
CONT (ON)
) is increased due to the voltage drop caused by I
CONT
and the
resistance "R". The I
CONT
is temperature dependence as shown in the "Control Current vs. Temperature"
characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds
the V
CONT (ON)
over the required temperature range.
*Output Capacitance Co
Output capacitor (Co)
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.
This product is designed to work with a low ESR capacitor (Co). However use of recommended
capacitance or larger value is effective for stable operation.
Use of a smaller Co 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
larger
value and connect between Vo terminal
and GND terminal with shortest path. The recommended capacitance depends on the output voltage
rank. Low voltage regulator requires
larger
value Co. Thus, check the recommended capacitance for
each output voltage rank.
Use of a larger Co reduces output noise and ripple output, and also improves output transient response
against rapid load change.
Ver.2010-06-02
-5-
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