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PDF NJM2846 Data sheet ( Hoja de datos )

Número de pieza NJM2846
Descripción (NJM2845 / NJM2846) LOW DROPOUT VOLTAGE REGULATOR
Fabricantes New Japan Radio 
Logotipo New Japan Radio Logotipo



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NJM2845/46
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2845 is low dropout voltage regulator. Advanced
Bipolar technology achieves low noise, high ripple rejection
and low quiescent current.
NJM2845 is 3 terminal type and NJM2846 is ON/OFF control
built in type. These product can be selected according to the
applications.
PACKAGE OUTLINE
NJM2845DL1 NJM2846DL3
FEATURES
High Ripple Rejection
75dB typ. (f=1kHz,3V Version)
Output Noise Voltage
Vno=45µVrms typ. (Vo=3V Version)
Output capacitor with 2.2µF ceramic capacitor (Vo2.6V)
Output Current
Io(max.)=800mA
High Precision Output
Low Dropout Voltage
Vo ±1.0%
0.18V typ. (Io=500mA)
ON/OFF Control
(NJM2846)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252-3 (NJM2845DL1), TO-252-5 (NJM2846DL3)
PIN CONFIGURATION
2
1.VIN
2.GND
3.VOUT
13
NJM2845DL1
3
12 3 45
1.CONTROL
2.VIN
3.GND
4.Vo
5.NC
NJM2846DL3
EQUIVALENT CIRCUIT
V IN
Bandgap
Reference
Thermal
Protection
V OUT
VIN
Control
Bandgap
Reference
Thermal
Protection
VOUT
GND
NJM2845DL1
GND
NJM2846DL3
Ver.2005-01-20
-1-

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TEST CIRCUIT
NJM2845/46
A IIN
VIN VOUT
VIN
0.33µF
NJM2846
A ICONT CONTROL
V VCONT
GND
2.2µF *6
(ceramic)
IOUT V VOU
*6 Vo2.6V version: Co=4.7µF(ceramic)
Ver.2005-01-20
-5-

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TYPICALCHARACTERISTICS(NJM2846)
NJM2846_3.0V
Output Voltage vs. Input Voltage
3.3
@:Ta=25oC
Co =2 .2 µF(Ce ra mic)
3.2
3.1
Io=0A
3
2.9
Io=200mA
2.8
Io=500mA
2.7
2.7 2.8 2.9 3 3.1 3.2 3.3
Input Voltage : VIN(V)
35
30
25
20
15
10
5
0
0
NJM2846_3.0V
Ground Pin Current v.s. Output Current
@:Ta=25oC
VIN=4.0V
Co=2.2µF(Ceramic)
200 400 600 800
Output Current : IO(mA)
1000
NJM2846_3.0V
60 Control Current vs. Control Voltage
@:Ta=25oC
V IN=4.0V
50
Co=2.2µF(Ceramic)
Io=30mA
40
30
Rc=0
20 Rc=100kRc=50k
10
0
0 0.5 1 1.5 2 2.5 3 3.5 4
Control Voltage : V (V)
Cont
Ver.2005-01-20
NJM2845/46
4
3.5
3
2.5
2
1.5
1
0.5
0
0
NJM2846_3.0V
Output Voltage vs. Output Current
@:Ta=25oC
V IN=4 .0V
Co =2 .2 µF(Ceramic)
500
1000
1500
Output Current : Io(mA)
2000
NJM2846_3.0V
0.35 Dropout Voltage vs. Output Current
@:Ta=25oC
Co=2.2µF(Ceramic)
0.3
0.25
0.2
0.15
0.1
0.05
0
0 200 400 600 800 1000
Output Current:Io(mA)
3.5
3
2.5
2
1.5
1
0.5
0
0
NJM2846_3.0V
Output Voltage vs. Control Voltage
Rc=0
Rc=50k
Rc=100k
@:Ta=25oC
V IN=4.0V
Co=2.2µF(Ceramic)
Io=30mA
0.5 1 1.5 2 2.5
Control Voltage : V (V)
Cont
3
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