NJM2885
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2885 is low dropout voltage regulator designed for
portable application.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
FEATURES
High Ripple Rejection
75dB typ. (f=1kHz,Vo=3V Version)
Output Noise Voltage
Vno=45µVrms typ.
Output capacitor with 2.2µF ceramic capacitor (Vo≥2.7V)
Output Current
Io(max.)=500mA
High Precision Output
Vo±1.0%
Low Dropout Voltage
0.18V typ. (Io=300mA)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252-3
PIN CONFIGURATION
2
PACKAGE OUTLINE
NJM2885DL1
PIN FUNCTION
1.V
IN
2.GND
3.V
OUT
1
3
NJM2885DL1
BLOCK DIAGRAM
V
IN
Thermal
Protection
Bandgap
Reference
V
OUT
GND
NJM2885
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM2885DL1-15
1.5V
NJM2885DL1-28
NJM2885DL1-18
1.8V
NJM2885DL1-03
NJM2885DL1-19
1.9V
NJM2885DL1-33
NJM2885DL1-21
2.1V
NJM2885DL1-35
NJM2885DL1-25
2.5V
NJM2885DL1-38
NJM2885DL1-26
2.6V
NJM2885DL1-05
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
V
OUT
2.8V
3.0V
3.3V
3.5V
3.8V
5.0V
(Ta=25°C)
UNIT
V
mW
°C
°C
RATINGS
+14
1190(*1)
3125(*2)
-40
∼
+85
-40
∼
+150
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm
2
)
(*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
V
IN
=+2.3V
∼
+14.0V (In case of Vo<2.1V)
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.33µF, Co=2.2µF,(1.7V<Vo≤2.6V: Co=4.7µF, Vo≤1.7V:Co=10µF), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX. UNIT
Output Voltage
Vo
Io=30mA
-1.0%
+1.0%
V
−
Quiescent Current
I
Q
Io=0mA
200
300
−
µA
Output Current
Io
Vo-0.3V
500
650
-
mA
0.10
%/V
Line Regulation
−
−
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6.0V, Io=30mA
Load Regulation
0.03 %/mA
∆Vo/∆Io
Io=0
∼
500mA
−
−
Io=300mA
0.18
0.28
V
Dropout Voltage(*3)
−
∆V
I−O
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
75
dB
−
−
Vo=3.0V Version
Average Temperature
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
−
±50
−
ppm/°C
Coefficient of Output Voltage
f=10Hz∼80kHz, Io=10mA,
45
Output Noise Voltage
V
NO
−
−
µVrms
Vo=3.0V Version
(*3): The output voltage excludes under 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.
NJM2885
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
2.2
µ
F
*4
(ceramic)
0.33
µ
F
NJM2885
GND
I
OUT
V
V
OUT
*4
1.7V<Vo≤2.6V version: Co=4.7µF(ceramic)
Vo≤1.7V version: 10µF(ceramic)
POWER DISSIPATION VS. AMBIENT TEMPERATURE
NJM2885DL1 PowerDissipation
(Topr=-40~+85°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)
NJM2885
*Input Capacitor C
IN
Input Capacitor C
IN
is required to prevent oscillation and reduce power supply ripple for applications
when high power supply impedance or a long power supply line.
Therefore, use the recommended C
IN
value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between GND and V
IN
as shortest path as possible to avoid the problem.
*Output Capacitor C
O
Output capacitor (C
O
) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.
Use of a smaller C
O
may cause excess output noise or oscillation of the regulator due to lack of the
phase compensation.
On the other hand, Use of a larger C
O
reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended C
O
value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between GND and V
OUT
as shortest path as possible for stable operation
The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator
requires larger C
O
value.
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a
temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor
supplier enough.
When selecting C
O,
recommend that have withstand voltage margin against output voltage and superior
temperature characteristic though this product is designed stability works with wide range ESR of capacitor
including low ESR products.
NJM2885
ELECTRICAL CHARACTERISTICS
NJM2885_3.0V
Output Voltage vs. Input Voltage
4
3.2
NJM2885_3.0V
Output Voltage vs. Output Current
@:Ta=25
o
C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
@:Ta=25 C
Co=2.2µF
(Ceramic)
3.1
o
3.5
3
Output Voltage : Vo(V)
Io=0A
3
Output Voltage : Vo(V)
3.3
3.4
2.5
2
2.9
Io=100mA
1.5
1
2.8
Io=300mA
0.5
2.7
2.7
2.8
2.9
3
3.1
3.2
0
0
200
400
600
800
1000
Input Voltage : V
IN
(V)
Output Current : Io(mA)
NJM2885_3.0V
Ground Pin Current v.s. Output Current
30
@:Ta=25
o
C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
25
0.35
o
NJM2885_3.0V
Dropout Voltage vs. Output Current
@:Ta=25 C
Co=2.2µF
(Ceramic)
0.3
Ground Pin Current : I
GND
(mA)
20
Dropout Voltage:dV
I-O
(V)
0.25
0.2
15
0.15
10
0.1
5
0.05
0
0
100
200
300
400
500
600
700
0
0
100
200
300
400
500
600
700
Output Current : I
O
(mA)
Output Current:Io(mA)
100
NJM2885_3.0V
Output Noise Voltage vs. Output Current
@:Ta=25
o
C
V
IN
=4.0V
LPF:80kHz
NJM2885_3.0V
Equivalent Serise Resistance vs. Output Current
100
@:Ta=25 C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
o
Equivalent Serise Resistance : ESR(Ω)
Output Noise Voltage : Vn(
µ
Vrms)
80
10
Co=2.2µF
(Ceramic)
60
STABLE REGION
1
40
Co=4.7µF
(Ceramic)
20
0.1
0
0.001
0.01
0.1
1
10
100
1000
0.02
0.001
0.01
0.1
1
10
100
10
3
Output Current : Io(mA)
Output Current : Io(mA)
