NJM12856
LDO with Reverse Current Protection / Soft Start / Discharge Function
GENERAL DESCRIPTION
The NJM12856 is a low dropout regulator which achieves
high ripple rejection, low noise and high speed response with
the bipolar technology.
Adjustable soft-start function is useful for reducing inrush
current and controlling power-on sequence. Moreover the
discharge function makes effective sequence control with the
soft-start function.
In addition, the reverse current protection makes external
SBD unnecessary.
FEATURE
Operating Voltage Range 2.5V ~ 6.5V
Output Voltage Accuracy
V
O
1.0%
Output Current
I
O
(min.)=1000mA
Reverse Current Protection
Adjustable soft-start Function
Discharge Function
ON/OFF Control
Correspond to Low ESR capacitor (MLCC)
Thermal Shutdown Circuit
Over Current Protection Circuit
Package Outline
SOT-89-5, TO-252-5
PIN CONFIGRATION
V
OUT
1
GND
2
C
S
3
5
V
IN
2
GND
4
CONTROL
3
5
4
3
2
1
■
PACKAGE OUTLINE
NJM12856U2
NJM12856DL3
C
S
V
OUT
GND
V
IN
CONTROL
NJM12856U2
BLOCK DIAGRAM
V
IN
CONTROL
NJM12856DL3
V
OUT
Reverse
Current
Protection
Thermal
Protection
Bandgap
Reference
Over Current
Protection
C
S
GND
Ver.2015-07-21
-1-
NJM12856
OUTPUT VOLTAGE RANK LIST
SOT-89-5
TO-252-5
Output
Device Name
Device Name
Voltage
NJM12856U2-15
1.5V
NJM12856DL3-15
NJM12856U2-18
1.8V
NJM12856DL3-18
NJM12856U2-25
2.5V
NJM12856DL3-25
NJM12856U2-33
3.3V
NJM12856DL3-33
NJM12856U2-05
5.0V
NJM12856DL3-05
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Pin Voltage
V
CONT
Output Voltage
Soft start Pin Voltage
Power Dissipation
Junction Temperature Range
Operating Temperature Range
Storage Temperature Range
Output
Voltage
1.5V
1.8V
2.5V
3.3V
5.0V
(Ta=25 C)
MAXIMUM RATING
UNIT
V
OUT
V
CS
P
D
Tj
Topr
Tstg
-0.3 ~ +7
-0.3 ~ +7
-0.3 ~ +5.5
Vo 1.8V
-0.3 ~ +7
Vo 1.8V
-0.3 ~ +2.5
625(*1)
SOT-89-5
2400(*2)
1190(*1)
TO-252-5
3125(*2)
-40 +150
-40 +125
-50 +150
V
V
V
V
V
mW
C
C
C
2
(*1): Mounted on glass epoxy board. (76.2 114.3 1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm )
(*2): Mounted on glass epoxy board. (76.2 114.3 1.6mm:based on EIA/JDEC standard, 4Layers)
(For 4Layers: Applying 74.2 74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
Operating Voltage Range
：
V
IN
=2.5V ~ 6.5V
-2-
Ver.2015-07-21
NJM12856
ELECTRICAL CHARACTERISTICS
(Unless other noted,
V
IN
= V
O
+ 1V, C
IN
= 0.33µF, C
O
=0.47µF(C
O
=1.0µF :2.4V Vo 2.9V, C
O
=2.2µF :1.7V Vo 2.4V, Co=4.7µF :Vo 1.7V), Cs=0.01µF, T
a
= 25°C)
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at OFF-state
Output Current
Line Regulation
Load Regulation
Dropout Voltage
(*3)
Average Temperature
Coefficient of Output Voltage
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
V
O
I
Q
I
Q(OFF)
I
O
V
O
/ V
IN
V
O
/ I
O
V
IO
V
O
/ Ta
I
O
=200mA
I
O
= 0mA,
except I
CONT
V
CONT
= 0V
V
O
0.9
V
IN
= V
O
+ 1V ~ 6.5V, Io=200mA
I
O
= 0 ~ 1000mA
I
O
=600mA
Ta= -40 ~ +125 C, I
O
=200mA
V
IN
=3.0V
ein=200mVrms,
f=1kHz, Io=10mA
-1.0%
-
-
1000
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.6
-
-
400
-
-
-
-
0.20
50
78
76
73
72
68
17
19
24
30
42
3
-
-
1.2
10
25
+1.0%
600
10
-
0.15
0.003
0.28
-
-
-
-
-
-
-
-
-
-
-
12
-
0.6
-
V
μA
μA
mA
%/V
%/mA
V
ppm/ C
Vo=1.5V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=5.0V
Vo=1.5V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=5.0V
Ripple Rejection
RR
ein=200mVrms,
f=1kHz, Io=10mA
dB
Output Noise Voltage
V
NO
f=10Hz ~ 80kHz,
Io=10mA
μVrms
Control Current
Control Voltage at
ON-state
Control Voltage at
OFF-state
Soft Start Time
Discharge Current
at OFF-state
I
CONT
V
CONT(ON)
V
CONT(OFF)
t
S(ON)
I
DIS
V
CONT
=1.6V
μA
V
V
msec
mA
V
CONT
=L→H, Io=200mA, Cs=0.022
μ
F
-
3
15
V
IN
=2.5V, V
CONT
=0V, V
O
=0.5V
V
IN
=6.5V, V
CONT
=0V, V
O
=0.5V
(*3):
Except Output Voltage Rank less than 2.2V
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.
Ver.2015-07-21
-3-
NJM12856
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM12856U2 PowerDissipation
(Topr=-40~+125°C,Tj=150°C)
Power Dissipation P
D
(mW)
3000
on 4 layers board
2500
2000
1500
1000
500
0
-50
-25
0
25
50
75
100
125
150
on 2 layers board
Temperature : Ta(°C)
NJM12856DL3 PowerDissipation
(Topr=-40~+125°C,Tj=150°C)
3500
Power Dissipation P
D
(mW)
3000
2500
2000
1500
1000
500
0
-50
on 4 layers board
on 2 layers board
-25
0
25
50
75
100
125
150
Temperature : Ta(°C)
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
0.33
μ
F
(ceramic)
NJM12856
(*4)
0.47
μ
F
(ceramic)
I
OUT
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
Cs
0.01
μ
F
(ceramic)
*4: 2.4V<Vo 2.9V version: Co=1.0 F(Ceramic)
1.7V<Vo 2.4V version: Co=2.2 F(Ceramic)
Vo 1.7V version: Co=4.7 F(Ceramic)
-4-
Ver.2015-07-21
NJM12856
TYPICAL APPLICATION
1. In the case where ON/OFF Control is not required
V
IN
0.33
μ
F
V
IN
V
OUT
(*5)
0.47
μ
F
V
OUT
NJM12856
CONTROL
GND
Cs
*Connected when soft start
is Required.
*5: 2.4V<Vo 2.9V version: Co=1.0 F
1.7V<Vo 2.4V version: Co=2.2 F
Vo 1.7V version: Co=4.7 F
Connect CONTROL Pin to V
IN
Pin
2. In use of ON/OFF CONTROL
V
IN
V
IN
V
OUT
V
OUT
(*6)
0.47
μ
F
0.33
μ
F
NJM12856
CONTROL
GND
Cs
*Connected when soft start
is Required.
*6: 2.4V<Vo 2.9V version: Co=1.0 F
1.7V<Vo 2.4V version: Co=2.2 F
Vo 1.7V version: Co=4.7 F
State of CONTROL Pin:
“H”
→
output is enabled.
“L” or “open”
→
output is disabled
Ver.2015-07-21
-5-
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