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PDF NJM2835 Data sheet ( Hoja de datos )
| Número de pieza | NJM2835 | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJM2835 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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NJM2835
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2835 is a 500mA output low dropout voltage
regulator.
Advanced Bipolar technology achieves low noise, high
ripple rejection and high supply voltage.
2.1V to 15.5V output voltage range, 2.2µF small
decoupling capacitor, built-in noise bypass capacitor make
the NJM2835 suitable for various applications.
PACKAGE OUTLINE
NJM2835DL1
FEATURES
z Output voltage options available 2.1 ∼ 15.5V
z High Ripple Rejection 75dB typ. (f=1kHz,Vo=3V Version)
z Output Noise Voltage Vno=45µVrms typ.
z Output capacitor with 2.2µF ceramic capacitor (Vo≥5.1V)
z Output Current
Io(max.)=500mA
z High Precision Output Vo±1.0%
z Low Dropout Voltage 0.18V typ. (Io=300mA)
z Internal Thermal Overload Protection
z Internal Over Current Protection
z Bipolar Technology
z Package Outline
TO-252-3
PIN CONFIGURATION
2
PIN FUNCTION
1.VIN
2.GND
3.VOUT
13
NJM2835DL1
EQUIVALENT CIRCUIT
VIN
Bandgap
Reference
Thermal
Protection
VOUT
GND
1 page  
NJM2835
¿Input Capacitance CIN
Input Capacitance CIN 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 CIN value of 0.33µF greater to avoid the problem.
CIN should connect between GND and VIN as short as possible.
¿Output Capacitance CO
Output capacitor (CO) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the
regulator.
This product is designed to work with a low ESR capacitor (CO). However use of recommended
capacitance or larger value is effective 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 larger value and connect between Vo
terminal and GND terminal with shortest path. The recommended capacitance depends on the output
voltage rank. Low voltage regulator requires larger value CO. Thus, check the recommended
capacitance for each output voltage rank.
In addition, You should consider varied characteristics of capacitor (a frequency characteristic, a
temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor
supplier enough .We recommend that withstand voltage margin against output voltage and superior in a
temperature characteristic, when selecting Output capacitor.
Uses of a larger CO reduces output noise and ripple output, and also improves output transient
response against rapid load change.
5 Page 
TYPICAL CHARACTERISTICS
●DC CHARACTERISTICS (8.5V Version)
2000
NJM2835_8.5V
Quiescent Current v.s. Input Voltage
@:Ta=25oC
Output is open.
Co=2.2µF(Ceramic)
1500
1000
500
0
0 4 8 12 16
Input Voltage : VIN(V)
●AC CHARACTERISTICS (8.5V Version)
NJM2835_8.5V
Output Noise Voltage vs. Output Current
200
@:Ta=25oC
V IN=9 .5V
LPF:80kHz
Co=2 .2 µF(Ceramic)
150
100
50
0
0.001
0.01 0.1 1 10
Output Current : Io(mA)
100
1000
NJM2835_8.5V
Ripple Rejection vs. Output Current
100
90
80 f=1kHz
70
60
f =1 0kHz
50
40
@:Ta=25oC
30 VIN=9.5V
ein=200mVrms
Co =2.2 µF(Ceramic)
20
0.001
0.01
0.1
1
10
Output Current : Io(mA)
100
1000
NJM2835
NJM2835_8.5V
Ripple Rejection Ratio v.s. Frequency
100
90
Io=10mA
80
Io=0mA
70
60
Io=30mA
50
40
@:Ta=25oC
30
VIN=9.5V
ein=200mVrms
Co=2.2µF(Ceramic)
20
1100
110000 1010k0
Frequency : f (Hz)
11004k
101005k
NJM2835_8.5V
Equivalent Serise Resistance vs. Output Current
100
@:Ta=25oC
VIN=9.5V
Co=2.2µF(Ceramic)
10
STABLE REGION
1
0.1
1u
10u 100u
1m
10m 100m 700m
Output Current : Io(A)
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet NJM2835.PDF ] | |
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