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PDF NJM2891 Data sheet ( Hoja de datos )
| Número de pieza | NJM2891 | |
| Descripción | 2ch LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJM2891
2ch LOW DROPOUT VOLTAGE REGULATOR
! GENERAL DESCRIPTION
The NJM2891 is low dropout voltage regulator designed
for cellular phone application.
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 1.0µF 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)
" 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)
! PACKAGE OUTLINE
NJM2891PB1
! PIN CONFIGURATION
98 7
7 89
10 6 6
11 5 5
12 4 4
10
11
12
123
3 21
TOP
BOTTOM
NJM2891PB1
! EQUIVALENT CIRCUIT
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
VIN1/ VIN2
Cont1/Cont2
Bandgap
Reference
Thermal
Protection
VOUT1/ VOUT2
Noise Bypass1 /
Noise Bypass2
GND
1 page  
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2 In use of ON/OFF CONTROL:
VOUT1
1.0µF *5
Cp=0.01µF
VOUT1
NOISE
BYPASS1
NC
VOUT1
CONTROL1
VIN1
NJM2891
VIN2
VOUT2
Cp=0.01µF
NOISE
BYPASS2
VOUT2
1.0µF *5
VOUT2
CONTROL2
GND
NJM2891
R
(0~300kΩ)
VIN1
0.1µF
VIN2
0.1µF
R
(0~300kΩ)
*5 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 0.01µF 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.
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJM2891.PDF ] | |
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