NJM2881/82
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
NJM2881/82 is a low dropout voltage regulator with ON/OFF
control.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
It is mounted on SOT-23-5 as small package and 1.0 F ceramic
capacitor is available. Therefore it is suitable for cellular phone,
camcorder, IC decoder, camera, and other portable items.
FEATURES
High Ripple Rejection
75dB typ. (f=1kHz ,Vo=3V version)
Low Output Noise Voltage Vno=30 Vrms (Cp=0.01 F)
Output capacitor with 1.0 F ceramic capacitor (Vo 2.7V)
Output Current
Io(max.)=300mA
High Precision Output
Vo 1.0%
Low Dropout Voltage
0.10V typ. (Io=100mA)
ON/OFF Control
(Active High)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
SOT-23-5
PIN CONFIGURATION
5
4
PACKAGE OUTLINE
NJM2881/82F
1 2 3
1.
2.
3.
4.
5.
CONTROL (Active High)
GND
NOISE BYPASS
V
OUT
V
IN
5
4
1 2 3
1.
2.
3.
4.
5.
V
IN
GND
CONTROL (Active High)
NOISE BYPASS
V
OUT
NJM2881F
NJM2882F
BLOCK DIAGRAM
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
Noise
Bypass
GND
Ver.2017-06-29
-1-
NJM2881/82
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM288*F15
1.5V
NJM288*F29
NJM288*F17
1.7V
NJM288*F03
NJM288*F18
1.8V
NJM288*F31
NJM288*F21
2.1V
NJM288*F32
NJM288*F25
2.5V
NJM288*F33
NJM288*F28
2.8V
NJM288*F345
NJM288*F285
2.85V
NJM288*F35
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
V
OUT
2.9V
3.0V
3.1V
3.2V
3.3V
3.45V
3.5V
Device Name
NJM288*F38
NJM288*F04
NJM288*F43
NJM288*F47
NJM288*F05
V
OUT
3.8V
4.0V
4.3V
4.7V
5.0V
(Ta=25 C)
RATINGS
UNIT
+14
V
+14(*1)
V
350(*2)
Power Dissipation
P
D
SOT-23-5
mW
200(*3)
Operating Temperature
Topr
-40 +85
C
Storage Temperature
Tstg
-40 +125
C
(*1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (114.3x76.2x1.6mm: 2Layers)
(*3): Device itself.
Operating voltage
V
IN
=+2.3 +6V (In case of Vo<2.1V)
ELECTRICAL CHARACTERISTICS
(Vo>2.0V version: V
IN
=Vo+1V, C
IN
=0.1 F, Co=1.0 F: Vo 2.7V (Co=2.2 F: Vo 2.6V), Cp=0.01 F, Ta=25 C)
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection
Average Temperature
Coefficient of Output
Voltage
Output Noise Voltage
Control Voltage for ON-state
Control Voltage for OFF-state
SYMBOL
Vo
I
Q
I
Q(OFF)
Io
Vo/ V
IN
Vo/ Io
V
I-O
RR
Vo/ Ta
V
NO
V
CONT(ON)
V
CONT(OFF)
TEST CONDITION
Io=30mA
Io=0mA, except Icont
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V Vo+6V, Io=30mA
Io=0 300mA
Io=100mA
ein=200mVrms,f=1kHz,Io=10mA,
Vo=3V version
Ta=0 85 C, Io=10mA
f=10Hz 80kHz, Io=10mA, Vo=3V version
MIN.
-1.0%
-
-
300
-
-
-
-
-
-
1.6
-
TYP.
-
120
-
400
-
-
0.10
75
50
30
-
-
MAX.
+1.0%
180
100
-
0.10
0.03
0.18
-
-
-
-
0.6
UNIT
V
A
nA
mA
%/V
%/mA
V
dB
ppm/ C
Vrms
V
V
-2-
Ver.2017-06-29
NJM2881/82
ELECTRICAL CHARACTERISTICS
(Vo 2.0V version: V
IN
=Vo+1V, C
IN
=0.1 F, Co=2.2 F: Vo 1.9V (Co=4.7 F: Vo 1.8V), Cp=0.01 F, Ta=25 C)
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Line Regulation
Load Regulation
Ripple Rejection
Average Temperature
Coefficient of Output Voltage
Output Noise Voltage
Control Voltage for ON-state
Control Voltage for OFF-state
SYMBOL
Vo
I
Q
I
Q(OFF)
Io
Vo/ V
IN
Vo/ Io
RR
Vo/ Ta
V
NO
V
CONT(ON)
V
CONT(OFF)
Io=30mA
TEST CONDITION
Io=0mA, except I
CONT
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V Vo+6V, Io=30mA
Io=0 300mA
ein=200mVrms,f=1kHz,Io=10mA,
Vo=1.8V version
Ta=0 85 C, Io=10mA
f=10Hz 80kHz, Io=10mA, Vo=1.8V version
MIN.
-1.0%
-
-
300
-
-
-
-
-
1.6
-
TYP.
-
120
-
400
-
-
80
50
20
-
-
MAX.
+1.0%
180
100
-
0.10
0.03
-
-
-
-
0.6
UNIT
V
A
nA
mA
%/V
%/mA
dB
ppm/ C
Vrms
V
V
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.
TEST CIRCUIT
I
IN
A
V
IN
V
IN
V
OUT
I
OUT
V
V
OUT
0.1 F
NJM2881/82
1.0 F
*4
(ceramic)
A
V
CONT
I
CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01 F
V
*4 1.9V Vo 2.6V version: Co=2.2 F(ceramic)
Vo 1.8V version: Co=4.7 F(ceramic)
Ver.2017-06-29
-3-
NJM2881/82
TYPICAL APPLICATION
In the case where ON/OFF Control is not required:
V
IN
0.1 F
NJM2881/82
R
(0 300k )
CONTROL
GND
NOISE
BYPASS
Cp=0.01 F
V
IN
V
OUT
V
OUT
1.0 F
*5
*5 1.9V Vo 2.6V version: Co=2.2 F
Vo 1.8V version: Co=4.7 F
Connect control terminal to V
IN
terminal
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
V
OUT
0.1 F
R
NJM2881/82
1.0 F
*5
CONTROL
GND
NOISE
BYPASS
Cp=0.01 F
*5 1.9V Vo 2.6V version: Co=2.2 F
Vo 1.8V version: Co=4.7 F
State of control terminal:
“H” output is enabled.
“L” or “open” output is disabled.
*Noise bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit. Noise level and ripple rejection
will be improved when larger Cp is used. Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01μF greater to avoid the problem.
*In the case of using a resistance "R" between V
IN
and control.
If this resistor is inserted, the control current could be reduced when the control voltage is high.
The applied voltage to control pin should set to consider voltage drop through the resistor “R” and the minimum
control voltage for ON-state.
The V
CONT (ON)
and I
CONT
have temperature dependence as shown in the "Control Current vs. Temperature" and "
Control Voltage vs. Temperature" characteristics. Therefore, the resistor "R" should be selected to consider the
temperature characteristics.
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Ver.2017-06-29
NJM2881/82
*Input Capacitor C
IN
The input capacitor C
IN
is required in order to prevent oscillation and reduce power supply ripple of applications when
high power supply impedance or a long power supply line.
Therefore, the recommended capacitance (refer to conditions of ELECTRIC CHARACTERISTIC) or larger input
capacitor, connected between V
IN
and GND as short path as possible, is recommended in order to avoid the problem.
*Output Capacitor C
O
The output capacitor C
O
is required for a phase compensation of the internal error amplifier, and the capacitance and
the equivalent series resistance (ESR) influence stable operation of the regulator.
If use a smaller output capacitor than the recommended capacitance (refer to conditions of ELECTRIC
CHARACTERISTIC), it may cause excess output noise or oscillation of the regulator due to lack of the phase
compensation. Therefore, the recommended capacitance or larger output capacitor, connected between V
OUT
and
GND as short path as possible, is recommended for stable operation. The recommended capacitance may be
different by output voltage, therefore confirm the recommended capacitance of the required output voltage.
Furthermore, a larger output capacitor reduces output noise and ripple output, and also improves Output Transient
Response when a load changes rapidly.
Selecting the output capacitor, should consider varied characteristics of a capacitor: frequency characteristics,
temperature characteristics, DC bias characteristics and so on. Therefore, the capacitor that has a sufficient margin of
the rated voltage against the output voltage and superior temperature characteristics, is recommended for C
O
.
Ver.2017-06-29
-5-
