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PDF NJM2857 Data sheet ( Hoja de datos )
| Número de pieza | NJM2857 | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | NJR | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJM2857 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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NJM2857www.DataSheet4U.com
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2857 is a 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.
1.5A output current capacity, 4.7µF small decoupling capacitor,
built-in noise bypass capacitor make the NJM2857 suitable for
various applications.
FEATURES
High Ripple Rejection
80dB typ. (f=1kHz, Vo=3V Version)
Output Noise Voltage
Vno=55µVrms typ. (Vo=3V Version)
Output capacitor with ceramic capacitor
Output Current
Io(max.)=1.5A
High Precision Output
Vo ±1.0%
Low Dropout Voltage
0.20V typ. (Io=1A)
ON/OFF Control
Internal Reverse Current Protection
Internal Thermal Overload Protection
Internal Over Current Protection
Bipolar Technology
Package Outline
TO-252-5
PIN CONFIGURATION
3 1.CONTROL
2.VIN
3.GND
4.Vo
5.N.C.
12 3 45
NJM2857DL3
EQUIVALENT CIRCUIT
PACKAGE OUTLINE
NJM2857DL3
VIN
CONTROL
Reverse
Current
Protection
Bandgap
Reference
Thermal
Protection
VOUT
GND
Ver.2010-02-08
Current
Limit
-1-
1 page  
TYPICAL APPLICATIONS
1 In the case where ON/OFF Control is not required:
VIN VIN VOUT
1.0µF
R
NJM2857
CONTROL
GND
(*4) 1.7V<Vo≤2.4V version: Co=10µF
Vo≤1.7V version:Co=22µF
Connect control terminal to VIN terminal
2 In use of ON/OFF CONTROL:
VIN VIN VOUT
1.0µF
R
NJM2857
CONTROL
GND
NJM2857www.DataSheet4U.com
(*4)
4.7µF
VOUT
(*4)
4.7µF
VOUT
(*4) 1.7V<Vo≤2.4V version: Co=10µF
Vo≤1.7V version:Co=22µF
State of control terminal:
•“H”→ output is enabled.
•“L” or “open” → output is disabled.
*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.
Ver.2010-02-08
-5-
5 Page 
NJM2857_5.0V
ON/OFF Transient Response Without Load
7 7.5
Control Voltage
6
2.5
5
Output Voltage
4
-2.5
-7.5
3 -13
2
1
0
-1
01
@:Ta=25°C
Vin=6V
Io=0mA
Co=4.7uF
23
Time:t(s)
4
-18
-23
-28
-33
5
5.50
5.40
5.30
5.20
5.10
5.00
4.90
4.80
4.70
0
NJM2857_5.0V
Load Transient Response
1500
Output Current
Output Voltage
40 80 120
Time:t(µs)
1000
500
0
-500
-1000
@:Ta=25°C
Vin=6V
Io=0-
1000mA
160
-1500
-2000
-2500
200
NJM2857www.DataSheet4U.com
NJM2857_5.0V
ON/OFF Transient Response
7 7.5
Control Voltage
6
2.5
5
@:Ta=25°C
-2.5
Output Voltage
4
Vin=6V
Io=30mA
-7.5
Co=4.7uF
3 -13
2 -18
1 -23
0
-1
04
8 12
Time:t(ms)
-28
-33
16 20
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
0
NJM2857_5.0V
Input Transient Response
8
Input Voltage
7
6
5
4
Output Voltage
40 80 120
Time:t(µs)
@:Ta=25°C
Io=30mA
Co=4.7uF
3
2
1
0
160 200
Ver.2010-02-08
[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 -
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJM2857.PDF ] | |
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