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PDF NJM2898 Data sheet ( Hoja de datos )
| Número de pieza | NJM2898 | |
| Descripción | 2ch ULTRA LOW NOISE LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | JRC | |
| Logotipo |  |
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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
75dB typ. (f=1kHz,Vo=3V Version)
" Output Noise Voltage
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
98 7
789
10 6 6
11 5 5
12 4 4
123
TOP
321
BOTTOM
NJM2898PB1
10
11
12
PIN FUNCTION
1. VOUT2
2. VOUT2
3. GND
4. CONTROL2
5. VIN2
6. VIN1
7. CONTROL1
8. VOUT1
9. VOUT1
10. NOISE BYPASS1
11. NC
12. NOISE BYPASS2
! EQUIVALENT CIRCUIT
VIN1/VIN2
Control1/
Control2
Bandgap
Reference
Thermal
Protection
VOUT1/VOUT2
Noise Bypass1/
Noise Bypass2
GND
Ver.2006-02-21
-1-
1 page  
www.DataSheet4U.com
2 In use of ON/OFF CONTROL:
VOUT1
1.0µF*4
Cp=0.01µF
VOUT1
NOISE
BYPASS1
NC
VOUT1
CONTROL1
VIN1
NJM2898
VIN2
VOUT2
Cp=0.01µF
NOISE
BYPASS2
VOUT2
1.0µF*4
VOUT2
CONTROL2
GND
NJM2898
R
(0 ∼ 300kΩ)
VIN1
0.1µF
VIN2
0.1µF
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.
%In the case of using a resistance "R" between VIN and control.
The current flow into the control terminal while the IC is ON state (ICONT) can be reduced when a pull up resistance
"R" is inserted between VIN and the control terminal.
The minimum control voltage for ON state (VCONT (ON)) is increased due to the voltage drop caused by ICONT and the
resistance "R". The ICONT 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
VCONT (ON) over the required temperature range.
Ver.2006-02-21
-5-
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJM2898.PDF ] | |
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