NJM2387/89
ADJUSTABLE LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2387/89 are adjustable low dropout voltage regulators .
The output current is up to 1.0A and dropout voltage is 0.2V typ. at
Io=0.5A. NJM2387 has ON/OFF control circuit and enable to
reduce quiescent current.
The NJM2387/89 is suitable for power module, TV, Display, car
stereo and low power applications.
PACKAGE OUTLINE
NJM2387DL2
NJM2387DL3 NJM2389F
FEATURE
Low Dropout Voltage
∆V
I-O
=0.2V typ. at Io=0.5A
Output Current
Io(max.)=1.0A
Reference Voltage
Vref=1.26V
±
2%
ON/OFF Control
(Active High : Only NJM2387)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252-5(NJM2387), TO-220F-4(NJM2389)
PIN CONFIGURATION
3
3
123 45
123 45
PIN FUNCTION
1.V
IN
2.ON/OFF CONTROL
3.V
OUT
4.V
ADJ
5.GND
PIN FUNCTION
1. V
IN
2. V
OUT
3. GND
4. V
ADJ
123 4
NJM2387DL2
EQUIVALENT CIRCUIT
V
IN
NJM2387DL3
NJM2389F
V
OUT
V
IN
V
OUT
Bandgap
Reference
Bandgap
Reference
Control
ON/OFF
control
Over Voltage
Protection
Thermal Over Current
Protection Protection
V
ADJ
Over Voltage
Protection
Thermal Over Current
Protection Protection
V
ADJ
GND
GND
NJM2387DL2/DL3
NJM2389F
Ver.2004-12-22
-1-
NJM2387/89
(Ta=25°C)
SYMBOL
RATINGS
UNIT
V
IN
+35
V
V
CONT
+35(*1)
V
V
ADJ
+6
V
Io
1.0
A
NJM2387
10(Tc≤25°C) / 1(Ta≤25°C)
W
Power Dissipation
P
D
NJM2389
18(Tc<50°C)
Operating Junction Temperature Range
Tj
-40
∼
+150
°C
Operating Temperature Range
Topr
-40
∼
+85
°C
Storage Temperature Range
Tstg
-50
∼
+150
°C
(*1): This applies for NJM2387. When input voltage is less than +35V, the absolute maximum control voltage is
equal to the input voltage.
NJM2387
ELECTRICAL CHARACTERISTICS (V
IN
=15V, V
O
=10V, Io=0.5A, R1=1kΩ, C
IN
=0.33µF, Co=22µF, Ta=25°C)
Measurement is to be conducted is pulse testing.
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input Voltage
V
IN
-
3.8
-
35
V
Output Voltage
V
OUT
-
1.5
-
20
V
Reference Voltage
Vref
-
1.235
1.26
1.285
V
Line Regulation
-
0.04
0.16
%/V
∆Vo/∆V
IN
V
IN
=V
O
+1V
∼
V
O
+17V
Load Regulation
-
0.2
1.4
%/A
∆Vo/∆Io
V
IN
=V
O
+2V,Io=0A
∼
1.0A
Average Temperature
-
-
∆Vo/∆T
Tj=0
∼
+125°C
±
0.02
%/°C
Coefficient of Output Voltage
Quiescent Current
I
Q
Io=0A
-
-
5
mA
Dropout Voltage
Io=0.5A
-
0.2
0.5
V
∆V
I-O
Vin=Vo+2V, ein=0.5Vrms
Ripple Rejection
RR
52
65
-
dB
ein=0.5Vrms
,
f=120Hz
ON Control Voltage
V
CONT(ON)
2.0(*2)
-
-
V
OFF Control Voltage
V
CONT(OFF)
-
-
0.4
V
ON Control Current
V
C
=2.7V
-
-
20
I
CONT(ON)
µA
OFF Control Current
-
-
-20
I
CONT(OFF)
V
C
=0.4V
µA
(*2): When ON/OFF CONTROL Terminal is open, Output Voltage is ON.
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2387DL2
(Topr=-40~+85°C,Tj=+150°C,P
D
=10W(T
C
≤25°C),P
D
=1W(Ta≤25°C))
12
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Control Voltage
Adjust Terminal Voltage
Output Current
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
Without Heat Sink
Infinuit Heat Sink
50
75
100
Ambient Temperature Ta(°C)
-2-
Ver.2004-12-22
NJM2387/89
TEST CIRCUIT
V
IN
NJM2387
GND
Control
V
OUT
R
2
V
ADJ
+
A
22µF
Io
V
IN
0.33µF
+
I
Q
A
A
Ic
R
1
Vc
1kΩ
V
Vo
R
L
Vo = Vref
×
(1 + R2/R1)
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
IN
V
IN
V
OUT
V
OUT
+
0.33µ F
NJM2387
R2
+
22µF
CONTROL
GND
V
ADJ
R1
1kΩ
Connect control terminal to V
IN
terminal or open.
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
V
OUT
+
0.33µ F
NJM2387
R2
+
22µ F
R
C
CONTROL
GND
V
ADJ
R1
1kΩ
State of control terminal:
•“H”
or “open”
→
output is enabled.
•“L” →
output is disabled.
Ver.2004-12-22
-3-
NJM2387/89
NJM2389
ELECTRICAL CHARACTERISTICS (V
IN
=15V, V
O
=10V, Io=0.5A, R1=1kΩ, C
IN
=0.33µF, Co=22µF, Ta=25°C)
Measurement is to be conducted is pulse testing.
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input Voltage
V
IN
-
3.8
-
35
V
Output Voltage
V
OUT
-
1.5
-
20
V
Reference Voltage
Vref
-
1.235
1.26
1.285
V
Line Regulation
-
0.04
0.16
%/V
∆Vo/∆V
IN
V
IN
=V
O
+1V
∼
V
O
+17V
Load Regulation
-
0.2
1.4
%/A
∆Vo/∆Io
V
IN
=V
O
+2V,Io=0A
∼
1.0A
Average Temperature
-
-
∆Vo/∆T
Tj=0
∼
+125°C
±
0.02
%/°C
Coefficient of Output Voltage
Quiescent Current
I
Q
Io=0A
-
-
5
mA
Dropout Voltage
Io=0.5A
-
0.2
0.5
V
∆V
I-O
Vin=Vo+2V, ein=0.5Vrms
Ripple Rejection
RR
52
65
-
dB
ein=0.5Vrms
,
f=120Hz
THERMAL CHARACTERISTICS
Thermal Resistance
Junction-to-Ambient Temperature
Junction to case
θja
θjc
60
5
°C/W
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2389F
(Topr=-40~+85°C,Tj=+150°C,P
D
=18W(T
C
<50°C))
20
18
16
14
12
10
8
6
4
2
0
-50
Power Dissipation PD(W)
Infinuit Heat Sink
Without Heat Sink
-25
0
25
50
75
100
Ambient Temperature Ta(°C)
-4-
Ver.2004-12-22
NJM2387/89
TEST CIRCUIT
V
IN
NJM2389
GND
V
OUT
R
2
V
ADJ
+
A
V
22µF
Io
V
IN
0.33µF
+
I
Q
A
V
ref
V
Vo
R
L
R
1
1kΩ
Vo = Vref
×
(1 + R2/R1)
Ver.2004-12-22
-5-
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