NJM2871/A
,
NJM2872/A
LOW DROPOUT VOLTAGE REGULATOR
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
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.
■ FEATURES
●High Ripple Rejection 70dB typ. (f=1kHz)
●Output Noise Voltage Vno=30µVrms (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)
●Internal Short Circuit Current Limit
●Internal Thermal Overload Protection
●Bipolar Technology
●Package Outline MTP5 (MTP5:2.8×2.9×1.1mm)
■ PIN CONFIGURATION
15
2
34
15
2
34
NJM2871F/AF NJM2872F/AF
■ EQUIVALENT CIRCUIT
V
OUT
GND
V
IN
Thermal
Protection
Bandgap
Reference
Noise
Bypass
Cont
■ OUTPUT VOLTAGE RANK LIST
Device Name V
OUT
Device Name V
OUT
Device Name V
OUT
NJM287××21 2.1V NJM287××03 3.0V
NJM287××04 4.0V
NJM287××25 2.5V NJM287××31 3.1V
NJM287××05 5.0V
NJM287××26 2.6V
NJM287××32 3.2V
NJM287××27 2.7V
NJM287××33 3.3V
NJM287××28 2.8V NJM287××34 3.4V
NJM287××285 2.85V
NJM287××35 3.5V
NJM287××29 2.9V NJM287××38 3.8V
NJM2871F/AF
NJM2872F/AF
PIN FUNCTION
1. CONTROL (Active High)
2. GND
3. NOISE BYPASS
4. V
OUT
5. V
IN
PIN FUNCTION
1.V
IN
2.GND
3.CONTROL (Active High)
4.NOISE BYPASS
5.V
OUT
NJM2871/A
,
NJM2872/A
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Input Voltage V
IN
+14 V
Control Voltage V
CONT
+14(note 1) V
Power Dissipation P
D
200 mW
Operating Temperature Topr −40 ∼ +85 °C
Storage Temperature Tst g −40 ∼ +125 °C
(note 1) When input voltage is less than +14V, the absolute maximum
control voltage is equal to the input voltage.
■ ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0uF: Vo≥2.7V (Co=2.2uF: 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
Quiescent Current I
Q
Io=0mA, expect Icont − 120 180 µA
Quiescent Current
at Control OFF I
Q(OFF)
V
CONT
=0V − − 100 nA
Output Current Io Vo−0.3V 150 200 - mA
Line Regulation ∆Vo/∆V
IN
V
IN
=Vo+1V ∼ Vo+6V, Io=30mA − − 0.10 %/V
Load Regulation ∆Vo/∆Io Io=0 ∼ 100mA − − 0.03 %/mA
Dropout Voltage ∆V
I−O
Io=60mA − 0.10 0.18 V
Ripple Rejection RR ein=200mVrms,f=1kHz, Io=10mA
V
IN
=Vo+1V, Vo=3V Version − 70 − dB
Average Temperature
Coefficient of Output
Voltage
∆Vo/∆Ta Ta= 0 ∼85°C, Io=10mA − 0.2 − mV/°C
Output Noise Voltage V
NO
f=10Hz∼80kHz, Io=10mA,
Vo=3V Version − 30 − µVrms
Control Voltage for
ON-state V
CONT(ON)
1.6 − − V
Control Voltage for
OFF-state V
CONT(OFF)
− − 0.6 V
(note 2) 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.
■ TEST CIRCUIT
VIN
VIN V
OUT
CONTROL
NOISE
BYPASS
GND
0.1uF
IIN
ICONT
VCONT
Cp=0.01uF
IOUT VOUT
V
V
A
A
1.0uF
2.2uF(Vo≤2.6V)
OR
(ceramic)
NJM2871/A
,
NJM2872/A
■ TYPICAL APPLICATION
①
In case that ON/OFF Control is not required:
V
IN
V
OUT
CONTROL NOISE
BYPASS
GND
0.1uF
Cp=0.01uF
V
OUT
V
IN
R
(0
∼
300kΩ)
1.0uF
2.2uF(Vo≤2.6V)
OR
(ceramic)
Connect control terminal to V
IN
terminal
The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum
operating voltage. For further information, please refer to Figure “Output Voltage vs. Control Voltage”.
②
In use of ON/OFF CONTROL:
V
IN
V
OUT
CONTROL
NOISE
BYPASS
GND
0.1uF
Cp=0.01uF
V
OUT
V
IN
R
1.0uF
2.2uF(Vo≤2.6V)
OR
(ceramic)
State of control terminal:
•“H”→ output is enabled.
• “L” or “open” → output is disabled.
✱Noise bypass Capacitance Cp
Noise bypass capacitance 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 value of 0.01uF greater to avoid the problem.
NJM2871/A
,
NJM2872/A
■ ELECTRICAL CHARACTERISTICS
NJM2871/A
,
NJM2872/A
■ ELECTRICAL CHARACTERISTICS
NJM2871/A
,
NJM2872/A
■ ELECTRICAL CHARACTERISTICS
NJM2871/A
,
NJM2872/A
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
