NJM2890
2ch LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2890 is a dual low dropout voltage regulator.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
FEATURES
High Ripple Rejection
70dB typ. (f=1kHz,Vo=3V Version)
Output Noise Voltage
Vno=30µVrms typ.(Cp=0.01µF)
Output capacitor with 1.0uF ceramic capacitor (Vo≥2.7V)
Output Current
Io(max.)=150mA
×
2ch
High Precision Output
Vo±1.0%
Low Dropout Voltage
0.10V typ. (Io=60mA)
Operating Voltage Range +2.5V∼+14V (Vo≤2.0V version)
ON/OFF Control
(Active High)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
VSP10
PIN CONFIGURATION
PACKAGE OUTLINE
NJM2890R
10 9 8 7 6
PIN FUNCTION
1. CONTROL1
2. V
IN
1
3. GND
4. V
IN
2
5. CONTROL2
6. NOISE BYPASS2
7. V
OUT
2
8. GND
9. V
OUT
1
10. NOISE BYPASS1
1 2 3 4 5
NJM2890R
EQUIVALENT CIRCUIT
V
IN
1/ V
IN
2
Cont1/Cont2
Thermal
Protection
Bandgap
Reference
V
OUT
1/ V
OUT
2
Noise Bypass1 /
Noise Bypass2
GND
NJM2890
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(*1)
V
320
mW
−40 ∼
+85
°C
−40 ∼
+125
°C
(*1) When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
OPERATING RANGE
V
IN
= V
IN
=+2.5V
∼
+14.0V (In case of Vo<2.1V version)
ELECTRICAL CHARACTERISTICS
(Vo>2.0V version :
1CH/2CH : V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0uF: Vo≥2.7V (Co=2.2uF: Vo≤2.6V), Cp=0.01µF, 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)
Io=30mA
Io=0mA, expect Icont
V
CONT
=0V
Vo−0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
100mA
Io=60mA
ein=200mVrms,f=1kHz, Io=10mA,
Vo=3V Version
Ta=0∼85°C, Io=10mA
f=10Hz∼80kHz, Io=10mA,
Vo=3V Version
TEST CONDITION
MIN.
-1.0%
−
−
150
−
−
−
−
−
−
1.6
−
TYP.
−
120
−
200
−
−
0.10
70
±50
30
−
−
MAX.
+1.0%
180
100
-
0.10
0.03
0.18
−
−
−
−
0.6
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
V
V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
(Vo≤2.0V version :
1CH/2CH : V
IN
=Vo+1V, C
IN
=0.1µF, Co=2.2uF, Cp=0.01µF, 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
Io=0mA, expect Icont
V
CONT
=0V
Vo−0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
100mA
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
TEST CONDITION
MIN.
-1.0%
−
−
150
−
−
−
−
−
1.6
−
TYP.
−
120
−
200
−
−
75
±50
22
−
−
MAX.
+1.0%
180
100
-
0.10
0.03
−
−
−
−
0.6
UNIT
V
µA
nA
mA
%/V
%/mA
dB
ppm/°C
µVrms
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.
NJM2890
OUTPUT VOLTAGE RANK LIST
Device Name
CH1
NJM2890R2121
2.1V
NJM2890R2727
2.7V
NJM2890R2818
2.8V
NJM2890R2828
2.8V
NJM2890R0318
3.0V
NJM2890R0303
3.0V
NJM2890R3325
3.3V
NJM2890R3333
3.3V
NJM2890R0403
4.0V
NJM2890R0521
5.0V
Vout
CH2
2.1V
2.7V
1.8V
2.8V
1.8V
3.0V
2.5V
3.3V
3.0V
2.1V
TEST CIRCUIT
NOISE
BYPASS1
A
I
CONT
1
V
CONT
1
V
CONTROL
Cp=0.01µF
A
I
IN
1
V
IN
1
0.1µF
V
IN
1
V
OUT
1
1.0µF
*2
(Ceramic)
I
OUT
1
V
OUT
1
V
NJM2890
GND
GND
A
I
IN
2
V
IN
2
0.1µF
V
IN
2
V
OUT
2
1.0µF
*2
(Ceramic)
NOISE
BYPASS2
I
OUT
2
V
OUT
2
V
A
I
CONT
2
V
CONT
2
CONTROL
V
Cp=0.01µF
*2
Vo≤2.6V version: Co=2.2µF(ceramic)
NJM2890
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
CONTROL
R
(0∼300kΩ)
NOISE
BYPASS1
Cp=0.01µF
V
IN
1
V
IN
1
V
OUT
1
1.0µF
*3
V
OUT
1
0.1µF
NJM2890
GND
GND
V
IN
2
V
IN
2
V
OUT
2
V
OUT
2
1.0µF
*3
0.1µF
R
(0∼300kΩ)
CONTROL
NOISE
BYPASS2
Cp=0.01µF
*3
Vo≤2.6V version: Co=2.2µF
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”.
NJM2890
2
In use of ON/OFF CONTROL:
CONTROL
R
(0∼300kΩ)
NOISE
BYPASS1
Cp=0.01µF
V
IN
1
V
IN
1
V
OUT
1
V
OUT
1
1.0µF
*3
0.1µF
NJM2890
GND
GND
V
IN
2
V
IN
2
V
OUT
2
V
OUT
2
1.0µF
*3
0.1µF
R
(0∼300kΩ)
CONTROL
NOISE
BYPASS2
Cp=0.01µF
*3
Vo≤2.6V version: Co=2.2µF
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 0.01
µ
F greater to avoid the problem.
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