NJM2871/A, NJM2872/A
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2871/A, NJM2872/A are low dropout voltage
regulators designed for cellular phone application.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
PACKAGE OUTLINE
NJM2871F/AF
NJM2872F/AF
FEATURES
High Ripple Rejection
70dB typ. (f=1kHz,Vo=3V Version)
Output Noise Voltage
Vno=30µVrms typ.(Cp=0.01µF)
Output capacitor with 1.0uF ceramic capacitor (Vo≥2.7V)
Output Current
Io(max.)=150mA
High Precision Output
Vo±2%
Vo±1%:A Version
Low Dropout Voltage
0.10V typ. (Io=60mA)
ON/OFF Control
(Active High)
Operating Voltage Range
+2.5V∼+14V (Vo≤2.0V version)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
SOT-23-5
PIN CONFIGURATION
5
4
1 2 3
PIN FUNCTION
1. CONTROL (Active High)
2. GND
3. NOISE BYPASS
4. V
OUT
5. V
IN
5
4
1 2 3
PIN FUNCTION
1.V
IN
2.GND
3.CONTROL (Active High)
4.NOISE BYPASS
5.V
OUT
NJM2871F/AF
NJM2872F/AF
EQUIVALENT CIRCUIT
V
IN
Cont
Bandgap
Reference
Thermal
Protection
V
OUT
Noise
Bypass
GND
Ver.2013-02-28
-1-
NJM2871/A, NJM2872/A
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(*1)
V
350(*2)
Power Dissipation
P
D
SOT-23-5
mW
200(*3)
Operating Temperature
Topr
−40 ∼
+85
°C
Storage Temperature
Tstg
−40 ∼
+125
°C
(*1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (114.3x76.2x1.6mm: 2Layers)
(*3): Device itself.
Operating voltage
V
IN
=+2.5
∼
+14V (In case of Vo<2.1V version)
ELECTRICAL CHARACTERISTICS
(Vo>2.0V version : V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0µF: Vo≥2.7V (Co=2.2µF: Vo≤2.6V), Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX. UNIT
Io=30mA
-2%
+2%
V
−
Output Voltage
Vo
Io=30mA, A Version
-1%
+1%
V
−
Io=0mA, expect Icont
Quiescent Current
120
180
I
Q
−
µA
Quiescent Current
V
CONT
=0V
100
nA
I
Q(OFF)
−
−
at Control OFF
Output Current
Io
150
200
-
mA
Vo−0.3V
Line Regulation
0.10
%/V
−
−
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
0.03 %/mA
∆Vo/∆Io
Io=0
∼
100mA
−
−
Io=60mA
Dropout Voltage
0.10
0.18
V
−
∆V
I−O
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
70
dB
−
−
Vo=3V Version
Average Temperature
Ta=0∼85°C, Io=10mA,
±50
ppm/°C
∆Vo/∆Ta
−
−
Coefficient of Output Voltage
Vo=3V Version
f=10Hz∼80kHz, Io=10mA,
30
Output Noise Voltage
V
NO
−
−
µVrms
Vo=3V Version
Control Voltage for ON-state
1.6
V
V
CONT(ON)
−
−
Control Voltage for OFF-state
0.6
V
V
CONT(OFF)
−
−
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
-2-
Ver.2013-02-28
NJM2871/A, NJM2872/A
(Vo≤2.0V version : V
IN
=Vo+1V, C
IN
=0.1µF, Co=4.7µF, Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
Io=30mA
Output Voltage
Vo
Io=30mA, A Version
Io=0mA, expect Icont
Quiescent Current
I
Q
Quiescent Current
I
Q(OFF)
V
CONT
=0V
at Control OFF
Output Current
Io
Vo−0.3V
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
∆Vo/∆Io
Io=0
∼
100mA
ein=200mVrms,f=1kHz, Io=10mA
Ripple Rejection
RR
Vo=1.8V Version
Average Temperature
Ta=0∼85°C, Io=10mA,
∆Vo/∆Ta
Coefficient of Output Voltage
Vo=1.8V Version
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
Vo=1.8V Version
Control Voltage for ON-state
V
CONT(ON)
Control Voltage for OFF-state
V
CONT(OFF)
MIN.
-2%
-1%
−
−
150
−
−
−
−
−
1.6
−
TYP.
−
−
120
−
200
−
−
75
±50
22
−
−
MAX.
+2%
+1%
180
100
-
0.10
0.03
−
−
−
−
0.6
UNIT
V
V
µA
nA
mA
%/V
%/mA
dB
ppm/°C
µVrms
V
V
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.
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
1.5V
NJM287××15
NJM287××285
1.8V
NJM287××29
NJM287××18
2.1V
NJM287××03
NJM287××21
2.3V
NJM287××31
NJM287××23
2.5V
NJM287××32
NJM287××25
2.6V
NJM287××26
NJM287××33
2.7V
NJM287××27
NJM287××34
2.8V
NJM287××28
NJM287××35
V
OUT
2.85V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
3.5V
Device Name
NJM287××355
NJM287××38
NJM287××04
NJM287××45
NJM287××46
NJM287××47
NJM287××05
V
OUT
3.55V
3.8V
4.0V
4.5V
4.6V
4.7V
5.0V
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
I
OUT
0.1µF
1.0µF
(ceramic)
*4
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01µF
*4 2.0V < Vo
≤
2.6V version : Co=2.2µF(ceramic)
Vo
≤
2.0V version : Co=4.7µF(ceramic)
Ver.2013-02-28
-3-
NJM2871/A, NJM2872/A
TYPICAL APPLICATION
1
In case that ON/OFF Control is not required:
V
IN
V
IN
0.1µF
1.0µF
*5
R
(0
∼
300kΩ)
CONTROL
GND
NOISE
BYPASS
Cp=0.01µF
V
OUT
V
OUT
*5 2.0V < Vo
≤
2.6V version : Co=2.2µF
Vo
≤
2.0V version : Co=4.7µF
Connect control terminal to V
IN
terminal
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
V
OUT
0.1µF
R
CONTROL
GND
NOISE
BYPASS
1.0µF
*5
Cp=0.01µF
*5 2.0V < Vo
≤
2.6V version : Co=2.2µF
Vo
≤
2.0V version : Co=4.7µF
State of control terminal:
•
“H”
→
output is enabled.
•
“L” or “open”
→
output is disabled.
*Noise bypass Capacitor Cp
Noise bypass capacitor Cp reduces noise generated by band-gap reference circuit. Noise level and ripple rejection
will be improved when larger Cp is used. Use of smaller Cp value may cause oscillation.
Use the Cp recommended value larger (refer to conditions of ELECTRIC CHARACTERISTIC) to avoid the problem.
*In the case of using a resistance "R" between V
IN
and control.
If this resistor is inserted, it can reduce the control current when the control voltage is high.
The applied voltage to control terminal should set to consider voltage drop through the resistor “R” and the minimum
control voltage for ON-state.
The V
CONT (ON)
and I
CONT
have temperature dependence as shown in the "Control Current vs. Temperature" and "
Control Voltage vs. Temperature" characteristics. Therefore, the resistance "R" should be selected to consider the
temperature characteristics.
-4-
Ver.2013-02-28
NJM2871/A, NJM2872/A
*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.
Ver.2013-02-28
-5-
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