NJM2880
LOW DROPOUT VOLTAGE REGULATOR
I
GENERAL DESCRIPTION
The NJM2880 is a low dropout voltage regulator.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
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FEATURES
GHigh
Ripple Rejection
70dB typ. (f=1kHz)
GOutput
Noise Voltage
Vno=30uVrms (Cp=0.01uF)
GOutput
capacitor with 1.0uF ceramic capacitor
GOutput
Current
Io(max.)=300mA
GHigh
Precision Output
Vo±1.0%
GLow
Dropout Voltage
0.10V typ. (Io=100mA)
GON/OFF
Control
(Active High)
GInternal
Short Circuit Current Limit
GInternal
Thermal Overload Protection
GBipolar
Technology
GPackage
Outline
SOT-89(5pin)
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PIN CONFIGURATION
PIN FUNCTION
1.CONTROL (Active High)
2.GND
3.NOISE BYPASS
4.V
OUT
5.V
IN
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PACKAGE OUTLINE
NJM2880U
NJM2880U
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EQUIVALENT CIRCUIT
V
IN
Cont
V
OUT
Thermal
Protection
Noise
Bypass
Bandgap
Reference
GND
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OUTPUT VOLTAGE RANK LIST
Device Name
Vout
Device Name
NJM2880U21
2.1V
NJM2880U33
NJM2880U25
2.5V
NJM2880U38
NJM2880U26
2.6V
NJM2880U05
NJM2880U27
NJM2880U28
NJM2880U285
NJM2880U03
2.7V
2.8V
2.85V
3.0V
Vout
3.3V
3.8V
5.0V
NJM2880
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ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(note 1)
V
350
mW
-40
∼
+85
°C
-40
∼
+125
°C
(note 1) When input voltage is less than +14V, the absolute maximum
control voltage is equal to the input voltage.
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ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, Co=1.0uF: Vo≥2.7V (Co=2.2uF: Vo≤2.6V), Cp=0.01uF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX.
Output Voltage
Vo
Io=30mA
-1.0%
-
+1.0%
Io=0mA, expect Icont
Quiescent Current
-
120
180
I
Q
Quiescent Current
V
CONT
=0V
-
-
100
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Q(OFF)
at Control OFF
Vo-0.3V
Output Current
Io
300
400
-
Line Regulation
-
-
0.10
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
-
-
0.03
∆Vo/∆Io
Io=0
∼
300mA
Dropout Voltage
Io=100mA
-
0.10
0.18
∆V
I
-
O
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
-
70
-
Vo=3V Version
Average Temperature
-
-
Coefficient of Output
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
±50
Voltage
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
-
30
-
Vo=3V Version
Control Voltage for
1.6
-
-
V
CONT(ON)
ON-state
Control Voltage for
V
CONT(OFF)
-
-
0.6
OFF-state
(note 2) 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.
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TEST CIRCUIT
UNIT
V
uA
nA
mA
%/V
%/mA
V
dB
ppm/°C
uVrms
V
V
A
V
IN
I
IN
V
IN
V
OUT
1.0uF
OR
2.2uF(Vo<2.6V)
(Ceramic
Capacitor)
I
OUT
0.1uF
V
V
OUT
A
V
V
CONT
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CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01uF
NJM2880
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TYPICAL APPLICATION
x
In the case where ON/OFF Control is not required:
V
IN
V
IN
V
OUT
1.0uF
OR
2.2uF(Vo<2.6V)
(Ceramic
Capacitor)
R
(0~300kΩ )
V
OUT
0.1uF
CONTROL
GND
NOISE
BYPASS
Cp=0.01uF
Connect control terminal to V
IN
terminal
The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum
operating voltage. For further information, please refer to Figure “Output Voltage vs. Control Voltage”.
y
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
1.0uF
OR
2.2uF(Vo<2.6V)
(Ceramic
Capacitor)
R
CONTROL
GND
NOISE
BYPASS
Cp=0.01uF
V
OUT
0.1uF
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 0.01uF greater to avoid the problem.
嵌入式系统
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