NJM12888
LDO with Reverse Current Protection / Soft Start / Discharge Function
GENERAL DESCRIPTION
The NJM12888 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.
FEATURES
Operating Voltage Range 2.3V to 6.5V
Output Voltage Accuracy
V
O
1.0%
Output Current
I
O
(min.)=300mA
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
DFN6-G1(ESON6-G1), SOT-23-5
PIN CONFIGRATION
(Top View)
(Bottom View)
■
PACKAGE OUTLINE
NJM12888KG1
NJM12888F
Cs
1
GND
2
CONTROL
3
6
V
OUT
5
NC
4
V
IN
6
5
4
1
2
3
connected to GND.
Exposed PAD on backside
V
IN
1
GND
2
CONTROL
3
NJM12888F
5
V
OUT
4
Cs
NJM12888KG1
BLOCK DIAGRAM
V
IN
CONTROL
V
OUT
Reverse
Current
Protection
Thermal
Protection
Bandgap
Reference
Over Current
Protection
C
S
GND
Ver.2015-08-19
-1-
NJM12888
OUTPUT VOLTAGE RANK LIST
DFN6-G1(ESON6-G1),
SOT-23-5
Output
Device Name
Device Name
Voltage
NJM12888KG1-15
1.5V
NJM12888F15
NJM12888KG1-18
1.8V
NJM12888F18
NJM12888KG1-25
2.5V
NJM12888F25
NJM12888KG1-33
3.3V
NJM12888F33
NJM12888KG1-05
5.0V
NJM12888F05
Output
Voltage
1.5V
1.8V
2.5V
3.3V
5.0V
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
(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 ~ +4
420(*1)
DFN6-G1
(ESON6-G1)
1200(*2)
480(*3)
SOT-23-5
650(*4)
-40 +150
-40 +125
-50 +150
V
V
V
V
V
mW
C
C
C
(*1): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 2Layers FR-4, with Exposed Pad)
(*2): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 4Layers FR-4, with Exposed Pad)
(For 4Layers: Applying 99.5×99.5mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
(*3): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers), internal Cu area: 74.2x74.2mm
Operating Voltage Range
：
V
IN
=2.3V ~ 6.5V
-2-
Ver.2015-08-19
NJM12888
ELECTRICAL CHARACTERISTICS
Unless other noted,
V
IN
= V
O
+ 1V, C
IN
= 0.1
µ
F, C
O
=0.47
µ
F(Co=1.0
µ
F :1.8V Vo 2.6V, Co=2.2
µ
F :Vo 1.8V), Cs=0.01
µ
F,
Ta
= 25°C
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at OFF-state
Output Current
Line Regulation
Load Regulation
Dropout Voltage
(*5)
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
=30mA
I
O
= 0mA,
except I
CONT
V
CONT
= 0V
V
O
0.9
V
IN
= V
O
+ 1V ~ 6.5V, Io=30mA
I
O
= 0 ~ 300mA
I
O
=100mA
Ta= -40 +125 C, I
O
=30mA
ein=200mVrms,
f=1kHz, Io=10mA
-1.0%
-
-
300
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.6
-
-
150
-
-
-
-
0.10
50
71
70
69
66
63
19
23
28
32
42
3
-
-
1.2
9
25
+1.0%
200
10
-
0.10
0.006
0.18
-
-
-
-
-
-
-
-
-
-
-
12
-
0.6
-
-
-
V
μA
μA
mA
%/V
%/mA
V
ppm/ C
Ripple Rejection
RR
Output Noise Voltage
V
NO
I
CONT
V
CONT(ON)
V
CONT(OFF)
t
S(ON)
I
DIS
f=10Hz ~ 80kHz,
Io=10mA
V
CONT
=1.6V
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
dB
μ
Vrms
Control Current
Control Voltage at
ON-state
Control Voltage at
OFF-state
Soft Start Time
Discharge Current
at OFF-state
μA
V
V
msec
mA
V
CONT
=L→H, Io=30mA, Cs=0.022μF
V
IN
=2.3V, V
CONT
=0V, V
O
=0.5V
V
IN
=6.5V, V
CONT
=0V, V
O
=0.5V
-
2
15
(*5):
Except Output Voltage Rank less than 2.1V
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.2015-08-19
-3-
NJM12888
THERMAL CHARACTERISTICS
PARAMETER
Junction-to-ambient
thermal resistance
Junction-to-Top of package
characterization parameter
SYMBOL
ja
VALUE
DFN6-G1
298 (*6)
(ESON6-G1)
104 (*7)
260 (*8)
SOT-23-5
192 (*9)
DFN6-G1
52 (*6)
(ESON6-G1)
26 (*7)
70 (*8)
SOT-23-5
60 (*9)
UNIT
C/W
jt
C/W
(*6): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 2Layers FR-4, with Exposed Pad)
(*7): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 4Layers FR-4, with Exposed Pad)
(For 4Layers: Applying 99.5×99.5mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
(*8): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*9): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers), internal Cu area: 74.2x74.2mm
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM12888KG1 PowerDissipation
(Topr=-40~+125°C,Tj=150°C)
2000
Power Dissipation P
D
(mW)
1600
on 4 layers board
1200
800
on 2 layers board
400
0
-50
-25
0
25
50
75
100
125
150
Temperature : Ta(°C)
NJM12888F PowerDissipation
(Topr=-40~+125°C,Tj=150°C)
800
Power Dissipation P
D
(mW)
700
600
500
400
300
200
100
0
-50
on 4 layers board
on 2 layers board
-25
0
25
50
75
100
125
150
Temperature : Ta(°C)
-4-
Ver.2015-08-19
NJM12888
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
0.1
μ
F
(ceramic)
NJM12888
(*10)
0.47
μ
F
(ceramic)
I
OUT
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
Cs
0.01
μ
F
(ceramic)
*10: 1.8V<Vo 2.6V version: Co=1.0 F(Ceramic)
Vo 1.8V version:
Co=2.2 F(Ceramic)
TYPICAL APPLICATION
1. In the case where ON/OFF Control is not required
V
IN
0.1
μ
F
V
IN
V
OUT
(*11)
0.47
μ
F
V
OUT
NJM12888
CONTROL
GND
*11: 1.8V<Vo 2.6V version: Co=1.0 F
Vo 1.8V version:
Co=2.2 F
Cs
*Connected when soft start
is Required.
Connect CONTROL Pin to V
IN
Pin
2. In use of ON/OFF CONTROL
V
IN
V
IN
V
OUT
V
OUT
(*12)
0.47
μ
F
0.1
μ
F
NJM12888
CONTROL
GND
Cs
*Connected when
start is Required.
soft
*12: 1.8V<Vo 2.6V version:Co=1.0 F
Vo 1.8V version:
Co=2.2 F
State of CONTROL Pin:
“H”
→
output is enabled.
“L” or “open”
→
output is disabled
Ver.2015-08-19
-5-
单片机
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