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PDF NJM2837 Data sheet ( Hoja de datos )
| Número de pieza | NJM2837 | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | New Japan Radio | |
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NJM2837
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2837 is a 1A output low dropout voltage regulator.
This product has Reverse Current Protection without
external SBD
Advanced Bipolar technology achieves low noise, high
ripple rejection and high supply voltage.
2.4V to 15V output voltage range, 2.2µF small decoupling
capacitor, built-in noise bypass capacitor make the NJM2837
suitable for various applications.
PACKAGE OUTLINE
NJM2837DL3
FEATURES
Output voltage options available 2.4 to 15.0V
High Ripple Rejection 80dB typ. (f=1kHz,VO=3V Version)
Output Noise Voltage Vno=45µVrms typ.
Output capacitor with 2.2µF ceramic capacitor (VO≥5.1V)
Output Current
IO(max.)=1A
High Precision Output VO±1.0%
Low Dropout Voltage 0.2V typ. (IO=600mA)
Internal Thermal Overload Protection
Internal Over Current Protection
Bipolar Technology
Package Outline
TO-252-5
PIN CONFIGURATION
3
12 3 4 5
NJM2837DL3
PIN FUNCTION
1.CONTROL
2.VIN
3.GND
4.VO
5.NC
EQUIVALENT CIRCUIT
VIN
CONTROL
Reverse
Current
Protection
Bandgap
Reference
Thermal
Protection
VOUT
GND
Current
Limit
1 page  
NJM2837
*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.
You should use the CIN value of 0.1µF larger to avoid the problem.
CIN should connect between GND and VIN as short as possible.
*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.
*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.
Use of a larger CO reduces output noise and ripple output, and also improves output transient response
against rapid load change.
*Reverse Current Protection
A reverse current protection circuit is built-in to this product and prevents a current inflow from an Output
terminal to the Input terminal when the input terminal voltage became lower than the output terminal
voltage.
When a regulator is controlled by off (VCONT<0.6V), the reverse current protection circuit functions.
5 Page 
NJM2837
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJM2837.PDF ] | |
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