NJM2845/46
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2845/46 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.VIN
2.GND
3.VOUT
1
3
3
123 45
NJM2845DL1
1.CONTROL
2.VIN
3.GND
4.Vo
5.NC
NJM2846DL3
EQUIVALENT CIRCUIT
VIN
VOUT
Thermal
Protection
VIN
Control
GND
NJM2845DL1
Ver.2007-02-23
Thermal
Protection
Bandgap
Reference
Bandgap
Reference
GND
VOUT
NJM2846DL3
-1-
NJM2845/46
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2845DL1
(Topr=-40~+85°C,Tj=+150°C,PD=10W(TC≤25°C),PD=1W(Ta≤25°C))
Power Dissipation PD(W)
12
10
∞ Heat Sink
8
θHS=5°C/W
6
θHS=10°C/W
θHS=20°C/W
4
2
Without Heat Sink
0
-50
-25
0
25
50
75
100
Ambient Temperature Ta(°C)
TEST CIRCUIT
A
VIN
IIN
VIN
0.33µF
VOUT
NJM2845
2.2µF
*3
IOUT V VOU
(ceramic)
GND
*3
1.7V
