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NJM2387/89
- 1 -
Ver.2004-12-22
ADJUSTABLE LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
PACKAGE OUTLINE
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.
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
EQUIVALENT CIRCUIT
PIN FUNCTION
1. V
IN
2. V
OUT
3. GND
4. V
ADJ
PIN FUNCTION
1.V
IN
2.ON/OFF CONTROL
3.V
OUT
4.V
ADJ
5.GND
V
IN
Control
GND
V
OUT
V
ADJ
Thermal
Protection
ON/OFF
control
Over Current
Protection
Over Voltage
Protection
Bandgap
Reference
V
IN
GND
V
OUT
V
ADJ
Thermal
Protection
Over Current
Protection
Over Voltage
Protection
Bandgap
Reference
NJM2387DL2/DL3
NJM2389F
NJM2389F
NJM2387DL2
NJM2387DL3
NJM2387DL2
1
2
3
4
5
3
NJM2389F
1 2 3 4
NJM2387DL3
1 2
3
4
5
3
NJM2387/89
- 2 -
Ver.2004-12-22
NJM2387DL2
(Topr=-40~+85C,Tj=+150C,P
D
=10W(T
C
25C),P
D
=1W(Ta
25C))
0
2
4
6
8
10
12
-50
-25
0
25
50
75
100
Ambient Temperature Ta(C)
P
o
wer
Di
s
s
i
pa
t
i
on P
D
(W
)
Infinuit Heat Sink
Without Heat Sink
HS
=5C/W
HS
=20C/W
HS
=10C/W
ABSOLUTE
MAXIMUM
RATINGS
(Ta=25
C)
PARAMETER SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
+35 V
Control Voltage
V
CONT
+35(*1) V
Adjust Terminal Voltage
V
ADJ
+6 V
Output Current
Io
1.0
A
NJM2387
10(Tc
25
C) / 1(Ta
25
C)
Power Dissipation
P
D
NJM2389
18(Tc<50
C)
W
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=1k
, C
IN
=0.33
F, Co=22
F, 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
Vo/
V
IN
V
IN
=V
O
+1V
V
O
+17V
- 0.04
0.16
%/V
Load Regulation
Vo/
Io V
IN
=V
O
+2V,Io=0A
1.0A
- 0.2
1.4
%/A
Average Temperature
Coefficient of Output Voltage
Vo/
T Tj=0
+125
C
-
0.02
-
%/
C
Quiescent Current
I
Q
Io=0A
-
-
5 mA
Dropout Voltage
V
I-O
Io=0.5A -
0.2
0.5
V
Ripple Rejection
RR
Vin=Vo+2V, ein=0.5Vrms
ein=0.5Vrms
,
f=120Hz
52 65 - dB
ON Control Voltage
V
CONT(ON)
2.0(*2)
-
-
V
OFF Control Voltage
V
CONT(OFF)
-
-
0.4
V
ON Control Current
I
CONT(ON)
V
C
=2.7V -
-
20
A
OFF Control Current
I
CONT(OFF)
V
C
=0.4V -
-
-20
A
(*2): When ON/OFF CONTROL Terminal is open, Output Voltage is ON.
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2387/89
- 3 -
Ver.2004-12-22
TEST CIRCUIT
A
Io
22
F
Vo
0.33
F
V
IN
R
L
NJM2387
+
I
Q
+
R
1
1k
R
2
Ic
Vc
A
A
V
V
IN
V
OUT
GND Control
V
ADJ
Vo = Vref
(1 + R2/R1)
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
Connect control terminal to V
IN
terminal or open.
2
In use of ON/OFF CONTROL:
State of control terminal:
"H" or "open"
output is enabled.
"L"
output is disabled.
V
OUT
CONTROL
GND
0.33
F
V
OUT
V
IN
V
IN
NJM2387
V
ADJ
22
F
+
R2
R1
1k
+
+
+
R
C
V
OUT
CONTROL
GND
0.33
F
V
OUT
V
IN
V
IN
NJM2387
V
ADJ
22
F
R2
R1
1k
NJM2387/89
- 4 -
Ver.2004-12-22
NJM2389
ELECTRICAL CHARACTERISTICS (V
IN
=15V, V
O
=10V, Io=0.5A, R1=1k
, C
IN
=0.33
F, Co=22
F, 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
Vo/
V
IN
V
IN
=V
O
+1V
V
O
+17V
- 0.04
0.16
%/V
Load Regulation
Vo/
Io V
IN
=V
O
+2V,Io=0A
1.0A
- 0.2
1.4
%/A
Average Temperature
Coefficient of Output Voltage
Vo/
T Tj=0
+125
C
-
0.02
-
%/
C
Quiescent Current
I
Q
Io=0A
-
-
5 mA
Dropout Voltage
V
I-O
Io=0.5A -
0.2
0.5
V
Ripple Rejection
RR
Vin=Vo+2V, ein=0.5Vrms
ein=0.5Vrms
,
f=120Hz
52 65 - dB
THERMAL CHARACTERISTICS
Junction-to-Ambient Temperature
ja
60
Thermal Resistance
Junction to case
jc
5
C/W
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2389F
(Topr=-40~+85C,Tj=+150C,P
D
=18W(T
C
<50C))
0
2
4
6
8
10
12
14
16
18
20
-50
-25
0
25
50
75
100
Ambient Temperature Ta(C)
Power Dissi
p
ation PD
(
W
)
Infinuit Heat Sink
Without Heat Sink
NJM2387/89
- 5 -
Ver.2004-12-22
TEST CIRCUIT
A
Io
22
F
Vo
0.33
F
V
IN
R
L
NJM2389
+
I
Q
+
R
1
1k
R
2
V
ref
V
A
V
V
IN
V
OUT
GND
V
ADJ
Vo = Vref
(1 + R2/R1)
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