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PDF NJM2817 Data sheet ( Hoja de datos )
| Número de pieza | NJM2817 | |
| Descripción | Low Dropout Voltage Regulator | |
| Fabricantes | NJR | |
| Logotipo |  |
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NJM2817www.DataSheet4U.com
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2817 is a low dropout voltage regulator with ON/OFF
control.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
It delivers up to 5V/3A output power with the maximum input
voltage of 8V.
The NJM2817 is suitable for audio/video and digital applications.
FEATURES
High Ripple Rejection
65dB typ. (f=1kHz,3V Version)
Output Noise Voltage
Vno=42µVrms typ. (Vo=3V Version)
Output capacitor with 4.7µF ceramic capacitor (Vo≥2.1V)
Output Current
Io(max.)=3.0A
High Precision Output
Vo ±1.0%
Low Dropout Voltage
0.12V typ. (Io=1.5A, 3.0V Version)
ON/OFF Control
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Package Outline
TO-252-5
PIN CONFIGURATION
3
12 3 45
1. VIN
2. CONTROL
3. Vo
4. N.C.
5. GND
NJM2817DL3
EQUIVALENT CIRCUIT
PACKAGE OUTLINE
NJM2817DL3
VIN
CONTROL
Current
Limit
VOUT
GND
Bandgap
Reference
Thermal
Protection
Ver.2010-07-12
-1-
1 page  
NJM2817www.DataSheet4U.com
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 4.7µF greater to avoid the problem.
CIN should connect between GND and VIN as short as possible.
Output Capacitance CO
Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The capacitance and the
equivalent series resistance (ESR) influence stability of the regulator.
If use a smaller Co, it 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 greater value and connect between Vo
terminal and GND terminal with minimal wiring.
The recommended capacitance depends on the output voltage. Low voltage regulator requires greater value of
the Co. Thus, check the recommended capacitance for each output voltage.
Use of a greater Co reduces output noise and ripple output, and also improves transient response of the output
voltage against rapid load change.
This product is designed to work with any capacitor including a low ESR capacitor for the Co; however, refer
"Equivalent Series Resistance vs. Output Current" and choose suitable capacitor.
When distance from an IC to load is long, an IC may cause malfunction by wiring capacity and an L ingredient
Please use it after having evaluated it enough.
Ver.2010-07-12
-5-
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJM2817.PDF ] | |
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