NJM2871B/72B
Low Dropout Voltage Regulator
!
GENERAL DESCRIPTION
The NJM2871B/72B are low dropout voltage regulator designed for
cellular phone applications.
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=30µVrms typ. (Cp=0.01µF)
"
Output capacitor with 1.0uF ceramic capacitor(Vo≥2.7V: Version)
"
Output Current
Io(max.)=150mA
"
High Precision Output
Vo
±1.0%
"
Low Dropout Voltage
0.10V typ. (Io=60mA)
"
Input Voltage Range
+2.3
∼
+14V(Vo≤2.0V version)
"
ON/OFF Control
(Active High)
"
Internal Short Circuit Current Limit
"
Internal Thermal Overload Protection
"
Bipolar Technology
"
Package Outline
SOT-23-5 (MTP5)
!
PIN CONFIGURATION
5
4
!
PACKAGE OUTLINE
NJM2871BF/72BF
1 2 3
1. CONTROL (Active High)
2. GND
3. NOISE BYPASS
4. V
OUT
5. V
IN
5
4
1 2 3
1. V
IN
2. GND
3. CONTROL (Active High)
4. NOISE BYPASS
5. V
OUT
NJM2871BF
!
EQUIVALENT CIRCUIT
V
IN
Control
Bandgap
Reference
NJM2872BF
V
OUT
Thermal
Protection
Noise
Bypass
GND
Ver.2006-02-20
-1-
NJM2871B/72B
!
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM287*BF15
1.5V
NJM287*BF26
NJM287*BF18
1.8V
NJM287*BF27
NJM287*BF19
1.9V
NJM287*BF28
NJM287*BF02
2.0V
NJM287*BF29
NJM287*BF21
2.1V
NJM287*BF03
NJM287*BF23
2.3V
NJM287*BF31
NJM287*BF24
2.4V
NJM287*BF32
NJM287*BF25
2.5V
NJM287*BF33
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
V
OUT
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
Device Name
NJM287*BF34
NJM287*BF35
NJM287*BF38
NJM287*BF04
NJM287*BF48
NJM287*BF05
V
OUT
3.4V
3.5V
3.8V
4.0V
4.8V
5.0V
(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
=+2.3
∼
+14V (In case of Vo<2.1V version)
!
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0µF: Vo≥2.7V (Co=2.2µF : 1.8V<Vo≤2.6V:, Co=4.7µF : Vo≤1.8V), Cp=0.01µF, Ta=25°C)
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Line Regulation
Load Regulation
Dropout Voltage (*4)
Ripple Rejection
Average Temperature
Coefficient of Output
Voltage
Output Noise Voltage
Control Voltage for
ON-state
Control Voltage for
OFF-state
SYMBOL
Vo
I
Q
I
Q(OFF)
Io
∆Vo/∆V
IN
∆Vo/∆Io
∆V
I
−
O
RR
∆Vo/∆Ta
V
NO1
V
CONT(ON)
V
CONT(OFF)
Io=30mA
Io=0mA, except Icont
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
100mA
Io=60mA
ein=200mVrms, f=1kHz, Io=10mA,
Vo=3V version
Ta=0
∼
+85°C, Io=10mA
f=10Hz∼80kHz, Io=10mA, Vo=3V Version
TEST CONDITION
MIN.
-1.0%
−
−
150
−
−
−
−
−
−
1.6
−
TYP.
−
120
−
200
−
−
0.10
75
±
50
30
−
−
MAX.
+1.0%
180
100
−
0.10
0.03
0.18
−
−
−
−
0.6
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
V
V
(*4): 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.
-2-
Ver.2006-02-20
NJM2871B/72B
!
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
I
OUT
0.1µF
NJM287*B
1.0µF
*5
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01µF
*5
1.8V<Vo
≤
2.6V version : Co=2.2µF
Vo≤ 1.8V version : Co=4.7µF
Ver.2006-02-20
-3-
NJM2871B/72B
!
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
IN
V
IN
0.1µF
V
OUT
V
OUT
NJM287*B
1.0µF
*6
R
(0
∼
300kΩ)
CONTROL
GND
NOISE
BYPASS
Cp=0.01µF
*6
1.8V<Vo
≤
2.6V version : Co=2.2µF
Vo≤1.8V 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
0.1
µ
F
R
NJM287*B
1.0
µ
F
*6
CONTROL
GND
NOISE
BYPASS
Cp=0.01
µ
F
*6
1.8V<Vo
≤
2.6V version : Co=2.2
µ
F(ceramic)
Vo
≤
1.8V version : Co=4.7
µ
F(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 0.01µF greater to avoid the problem.
%In
the case of using a resistance "R" between V
IN
and control.
The current flow into the control terminal while the IC is ON state (I
CONT
) can be reduced when a pull up resistance
"R" is inserted between V
IN
and the control terminal.
The minimum control voltage for ON state (V
CONT (ON)
) is increased due to the voltage drop caused by I
CONT
and the
resistance "R". The I
CONT
is temperature dependence as shown in the "Control Current vs. Temperature"
characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds the
V
CONT (ON)
over the required temperature range.
-4-
Ver.2006-02-20
NJM2871B/72B
!
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2871B/72BF Power Dissipation
(Topr=-40
½
+85
℃
,Tj=125
℃
,P
D
=200mW(Ta
≦
25
℃
))
500
Power Dissipation P
D
(mW)
400
On Board(114.3×76.2×1.6mm, FR-4)
300
Device itself
200
100
0
-50
-25
0
25
50
75
100
Ambient Temperature Ta(
℃
)
Ver.2006-02-20
-5-
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
