NJM2830
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2830 is a 300mA output low dropout voltage regulator
with ON/OFF control.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
2.0V to 15.5V output voltage range, 1µF small decoupling
capacitor, built-in noise bypass capacitor make the NJM2830
suitable for various applications.
FEATURES
Output voltage options available
2.1
∼
15.5V (0.1V step)
High Ripple Rejection
75dB typ. (f=1kHz Vo=3V Version)
Output Noise Voltage
Vno=50µVrms typ.
Output capacitor with 1.0µF ceramic capacitor (Vo≥5.1V)
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 Thermal Overload Protection
Internal Over Current Protection
Bipolar Technology
Package Outline
SOT-89-5
PACKAGE OUTLINE
NJM2830U1
PIN CONFIGURATION
5
2
4
1. CONTROL
2. GND
3. NC
4. V
OUT
5. V
IN
1
2
3
NJM2830U1
EQUIVALENT CIRCUIT
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
GND
Ver.2008-12-16
-1-
NJM2830
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
RATINGS
+20
+20
440
-40∼+85
-40∼+150
(Ta=25°C)
UNIT
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(V
IN=
Vo+1V, C
IN
=0.1µF, Co=1.0µF (4.9V<Vo≤5.5V:Co=2.2µF, 2.9V<Vo≤4.9V:Co=4.7µF, Vo≤2.9V: Co=10µF),Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Output Voltage
Vo
Io=30mA
-1.0%
+1.0%
V
−
130
180
Vo≤5V Version
−
µA
Io=0mA,
Quiescent Current
I
Q
145
195
5V<Vo≤10V Version
−
µA
except Icont
160
210
10V<Vo≤15V Version
−
µA
Quiescent Current
I
Q(OFF)
V
CONT
=0V
100
nA
−
−
at Control OFF
Output Current
Io
Vo-0.3V
300
400
mA
−
V
IN
=Vo+1V
∼
Vo+6V(Vo≤12V Version)
0.10
%/V
Line Regulation
−
−
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
18V(Vo>12V Version),
Io=30mA
Load Regulation
0.009 %/mA
∆Vo/∆Io
Io=0
∼
300mA
−
−
Io=100mA
0.10
0.18
V
Dropout Voltage(*1)
−
∆V
I−O
ein=200mVrms,f=1kHz,Io=10mA,
Ripple Rejection
RR
75
dB
−
−
Vo=3V Version
Average Temperature
Coefficient of Output
∆Vo/∆Ta
Ta=0
∼
85°C, Io=10mA
−
±
50
−
ppm/°C
Voltage
f=10Hz
∼
80kHz, Io=10mA
50
Output Noise Voltage
V
NO
−
−
µVrms
Vo=3V Version
Control Current
I
CONT
V
CONT
=1.6V
3
12
µA
Control Voltage for
V
CONT(ON)
1.6
V
−
−
ON-state
Control Voltage for
V
CONT(OFF)
0.6
V
−
−
OFF-state
Input Voltage
V
IN
18
V
−
−
(*1): 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.2008-12-16
-3-
NJM2830
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
*3
V
OUT
1.0µF
0.1µF
R
NJM2830
CONTROL
GND
*3 4.9V<Vo
≤
5.5V version: Co=2.2µF(ceramic)
2.9V<Vo
≤
4.9V version: Co=4.7µF(ceramic)
Vo
≤
2.9V version: Co=10µF(ceramic)
State of control terminal:
•“H”→
output is enabled.
•“L”
or “open”
→
output is disabled.
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.
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 0.1µF greater to avoid the problem.
C
IN
should connect between GND and V
IN
as short as possible.
Output Capacitance C
O
Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The capacitance and the
equivalent series resistance (ESR) influences stability of the regulator.
This product is designed to work with a low ESR capacitor for the Co; however, use of recommended capacitance or
greater value is essential 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 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.
Ver.2008-12-16
-5-
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