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 (Vo≥2.6V)
Output Current
Io(max.)=800mA
High Precision Output
Vo
±1.0%
Low Dropout Voltage
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.V
IN
2.GND
3.V
OUT
3
3
1
123 45
1.CONTROL
2.V
IN
3.GND
4.Vo
5.NC
NJM2845DL1
EQUIVALENT CIRCUIT
NJM2846DL3
V
IN
Thermal
Protection
Bandgap
Reference
V
OUT
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
GND
GND
NJM2845DL1
NJM2846DL3
Ver.2005-01-20
-1-
NJM2845/46
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
NJM284*DL*-18
1.8V
NJM284*DL*-23
2.3V
NJM284*DL*-25
2.5V
NJM284*DL*-03
3.0V
NJM284*DL*-33
3.3V
NJM284*DL*-05
5.0V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
(Ta=25°C)
RATINGS
UNIT
+14
V
+14
(*1)
V
10(Tc≤25°C)
W
1.0(Ta≤25°C)
Operating
Topr
-40
∼
+85
°C
Temperature
Storage
Tstg
-40
∼
+150
°C
Temperature
(*1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
Operating voltage
V
IN
=+2.5V(In case of Vo<2.3V) ~ +(Vo+10V)
NJM2845
ELECTRICAL CHARACTERISTICS (V
IN
=Vo+1V, C
IN
=0.33µF, Co=2.2µF(Vo≤2.6V: Co=4.7µF), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
Output Voltage
Vo
Io=30mA
-1.0%
-
+1.0%
Quiescent Current
I
Q
Io=0mA
-
400
600
Output Current
Io
Vo - 0.3V
800
1050
-
-
-
0.10
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
-
-
0.004
∆Vo/∆Io
Io=0
∼
800mA
Io=500mA
-
0.18
0.28
Dropout Voltage(*2)
∆V
I -O
ein=200mVrms, f=1kHz, Io=10mA,
Ripple Rejection
RR
-
75
-
Vo=3V Version
Average Temperature
-
-
Coefficient of Output
∆Vo/∆Ta
Ta=0
∼
85°C, Io=10mA
±
50
Voltage
f=10Hz
∼
80kHz, Io=10mA,
Output Noise Voltage
V
NO
-
45
-
Vo=3V Version
(*2): The output voltage excludes under 2.3V.
The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
UNIT
V
µA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
-2-
Ver.2005-01-20
NJM2845/46
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2846DL3
(Topr=-40~+85°C,Tj=+150°C,P
D
=10W(T
C
≤25°C),P
D
=1W(Ta≤25°C))
12
Power Dissipation PD(W)
10
8
6
4
2
0
-50
-25
0
25
θ
HS
=5°C/W
θ
HS
=10°C/W
θ
HS
=20°C/W
∞
Heat Sink
Without Heat Sink
50
75
100
Ambient Temperature Ta(°C)
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
0.33µF
NJM2845
I
OUT
V
V
OU
2.2µF
*3
(ceramic)
GND
*3
Vo≤2.6V version: Co=4.7µF(ceramic)
TYPICAL APPLICATION
V
IN
V
IN
V
OUT
V
OUT
2.2µF
*4
0.33µF
NJM2845
GND
*4
Vo
≤
2.6V version: Co=4.7
µ
F
Ver.2005-01-20
-3-
NJM2845/46
NJM2846
ELECTRICAL CHARACTERISTICS (V
IN
=Vo+1V, C
IN
=0.33µF, Co=2.2µF(Vo≤2.6V: Co=4.7µF), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
Output Voltage
Vo
Io=30mA
-1.0%
-
+1.0%
Quiescent Current
I
Q
Io=0mA
-
400
600
Quiescent Current
V
CONT
=0V
-
-
100
I
Q (OFF)
at Control OFF
Line Regulation
Io
Vo - 0.3V
800
1050
-
-
-
0.10
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
-
-
0.004
∆Vo/∆Io
Io=0
∼
800mA
Io=500mA
-
0.18
0.28
Dropout Voltage(*5)
∆V
I -O
ein=200mVrms, f=1kHz, Io=10mA,
Ripple Rejection
RR
-
75
-
Vo=3V Version
Average Temperature
-
-
Coefficient of Output
∆Vo/∆Ta
Ta=0
∼
85°C, Io=10mA
±
50
Voltage
f=10Hz
∼
80kHz, Io=10mA,
Output Noise Voltage
V
NO
-
45
-
Vo=3V Version
Control Current
I
CONT
V
CONT
=1.6V, Io=0mA
-
3
12
Control Voltage for ON-state
V
CONT(ON)
1.6
-
-
Control Voltage for OFF-state
V
CONT(OFF)
-
-
0.6
(*5): The output voltage excludes under 2.3V.
The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°
C
µVrms
µA
V
V
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2846DL3
(Topr=-40~+85°C,Tj=+150°C,P
D
=10W(T
C
≤25°C),P
D
=1W(Ta≤25°C))
12
Power Dissipation PD(W)
10
8
6
4
2
0
-50
-25
0
25
θ
HS
=5°C/W
θ
HS
=10°C/W
θ
HS
=20°C/W
∞
Heat Sink
Without Heat Sink
50
75
100
Ambient Temperature Ta(°C)
-4-
Ver.2005-01-20
NJM2845/46
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
0.33µF
NJM2846
2.2µF
*6
I
OUT
V
V
OU
(ceramic)
A
V
V
CONT
I
CONT
CONTROL
GND
*6
Vo≤2.6V version: Co=4.7µF(ceramic)
Ver.2005-01-20
-5-
瑞萨MCU/MPU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
