NJM2898
2ch ULTRA LOW NOISE LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2898 is a 2ch ultra low noise low dropout voltage regulator
designed for VCO Applications.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
PACKAGE OUTLINE
NJM2898PB1
FEATURES
High Ripple Rejection
Output Noise Voltage
75dB typ. (f=1kHz,Vo=3V Version)
Vno=19µVrms typ. (Cp=0.01µF, Co=1.0µF(Ceramic))
Vno=12µVrms typ. (Cp=0.1µF, Co=10µF(Tantalum))
Output capacitor with 1.0uF ceramic capacitor
Output Current
Io(max.)=100mA
×
2ch
High Precision Output
Vo±1.0%
Low Dropout Voltage
0.10V typ. (Io=60mA)
ON/OFF Control
(Active High)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
FFP12-B1 (2.0×2.0×0.85mm)
PIN CONFIGURATION
9
8
7
7
8
9
10
11
12
10
11
12
1
2
3
6
5
4
6
5
4
3
2
1
PIN FUNCTION
1. V
OUT
2
2. V
OUT
2
3. GND
4. CONTROL2
5. V
IN
2
6. V
IN
1
7. CONTROL1
8. V
OUT
1
9. V
OUT
1
10. NOISE BYPASS1
11. NC
12. NOISE BYPASS2
TOP
UNDER
NJM2898PB1
EQUIVALENT CIRCUIT
V
IN
1/V
IN
2
Control1/
Control2
Bandgap
Reference
Thermal
Protection
Noise Bypass1/
Noise Bypass2
V
OUT
1/V
OUT
2
GND
Ver.2004-12-22
-1-
NJM2898
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(*1)
V
350(*2)
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.
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (114.3x76.2x1.6mm: 2Layers)
ELECTRICAL CHARACTERISTICS
(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
SYMBOL
TEST CONDITION
MIN. TYP.
Output Voltage
Vo
Io=30mA
-1.0%
−
Quiescent Current
I
Q
Io=0mA, except Icont, per 1ch
120
−
Quiescent Current
V
CONT
=0V, per 1ch
I
Q(OFF)
−
−
at Control OFF
Output Current
Io
100
130
Vo−0.3V
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
−
−
Load Regulation
∆Vo/∆Io
Io=0
∼
100mA
−
−
Io=60mA
0.10
Dropout Voltage
∆V
I−O
−
ein=200mVrms,f=1kHz, Io=10mA,
Ripple Rejection
RR
75
−
Vo=3V Version
Average Temperature
Coefficient of Output
∆Vo/∆Ta
Ta=0
∼
85°C, Io=10mA
±
50
−
Voltage
f=10Hz
∼
80kHz, Io=10mA, Cp=0.01µF,
Output Noise Voltage1
V
NO1
19
−
Co=1.0µF(Ceramic), Vo=3V Version
f=10Hz
∼
80kHz, Io=10mA, Cp=0.1µF,
Output Noise Voltage2
V
NO2
12
Co=10µF(Tantalum), Vo=3V Version
Control Voltage for
1.6
V
CONT(ON)
−
ON-state
Control Voltage for
V
CONT(OFF)
−
−
OFF-state
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.
OUTPUT VOLTAGE RANK LIST
Device Name
NJM2898PB1-2828
NJM2898PB1-JJ
NJM2898PB1-0303
NJM2898PB1-0521
V
OUT
CH1
2.8V
2.85V
3.0V
5.0V
CH2
2.8V
2.85V
3.0V
2.1V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
MAX.
+1.0%
180
100
-
0.10
0.03
0.18
−
−
−
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
µVrms
−
0.6
V
V
-2-
Ver.2004-12-22
NJM2898
TEST CIRCUIT
A
1.0µF
*note1
I
CONT
1
V
V
OUT
1
I
OUT
1
V
V
CONT
1
V
OUT
1
V
OUT
1
CONTROL1
NOISE
BYPASS1
Cp=0.01µF
V
IN
1
A
0.1µF
I
IN
1
V
IN
1
NC
NJM2898
V
IN
2
A
I
IN
2
0.1µF
V
IN
2
NOISE
BYPASS2
CONTROL2
Cp=0.01µF
V
OUT
2
V
OUT
2
GND
A
I
CONT
2
V
V
CONT
2
V
V
OUT
2
I
OUT
2
1.0µF
*3
(ceramic)
*3 Vo≤2.6V version: Co=2.2µF(ceramic)
Ver.2004-12-22
-3-
NJM2898
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
OUT
1
1.0µF
*note1
V
OUT
1
V
OUT
1
CONTROL1
R
(0
∼
300kΩ)
NOISE
BYPASS1
Cp=0.01µF
V
IN
1
V
IN
1
0.1µF
NC
NJM2898
V
IN
2
V
IN
2
R
NOISE
BYPASS2
Cp=0.01µF
V
OUT
2
V
OUT
2
1.0µF
*4
V
OUT
2
GND
(0
∼
300kΩ)
CONTROL2
0.1µF
*4 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”.
-4-
Ver.2004-12-22
NJM2898
2
In use of ON/OFF CONTROL:
V
OUT
1
1.0µF
*note1
R
(0
∼
300kΩ)
V
OUT
1
V
OUT
1
CONTROL1
NOISE
BYPASS1
Cp=0.01µF
V
IN
1
V
IN
1
0.1µF
NC
NJM2898
V
IN
2
V
IN
2
0.1µF
NOISE
BYPASS2
CONTROL2
Cp=0.01µF
V
OUT
2
V
OUT
2
1.0µF
*4
V
OUT
2
GND
R
(0
∼
300kΩ)
*4 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 0.01uF greater to avoid the problem.
Ver.2004-12-22
-5-
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