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PDF NJM2855 Data sheet ( Hoja de datos )
| Número de pieza | NJM2855 | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | New Japan Radio | |
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Hay una vista previa y un enlace de descarga de NJM2855 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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NJM2855
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2855 is a 3-terminal low dropout voltage regulator.
Advanced Bipolar technology achieves low noise, high ripple
rejection.
It delivers up to 5V/1A output power with the maximum input
voltage of 10V.
The NJM2855 is suitable for various applications such as
portable / consumer devices.
PACKAGE OUTLINE
NJM2855DL1
FEATURES
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≥2.7V)
z Output Current
Io (max.)=1A
z High Precision Output Vo±1.0%
z Low Dropout Voltage 0.20V typ. (Io=600mA)
z Internal Short Circuit Current Limit
z Internal Thermal Overload Protection
z Bipolar Technology
z Package Outline
TO-252-3
PIN CONFIGURATION
2
PIN FUNCTION
1.VIN
2.GND
3.VOUT
13
NJM2855DL1
EQUIVALENT CIRCUIT
V IN
Bandgap
Reference
Thermal
Protection
V OUT
GND
Ver.2012-10-24
1
1 page  
NJM2855
*Input Capacitor CIN
Input Capacitor CIN is required to prevent oscillation and reduce power supply ripple for applications
when high power supply impedance or a long power supply line.
Therefore, use the recommended CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between GND and VIN as shortest path as possible to avoid the problem.
*Output Capacitor 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.
Use of a smaller CO may cause excess output noise or oscillation of the regulator due to lack of the
phase compensation.
On the other hand, Use of a larger CO reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended CO value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between GND and VOUT as shortest path as possible for stable operation
The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator
requires larger CO value.
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.
When selecting CO, recommend that have withstand voltage margin against output voltage and superior
temperature characteristic though this product is designed stability works with wide range ESR of capacitor
including low ESR products.
Ver.2012-10-24
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJM2855.PDF ] | |
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