NJM2870
LOW DROPOUT VOLTAGE REGULATOR
!
GENERAL DESCRIPTION
The NJM2870 is low dropout voltage regulator designed
for cellular phone application.
Advanced Bipolar technology achieves low noise, high
ripple rejection and low quiescent current.
!
FEATURES
"High
Ripple Rejection
!
PACKAGE OUTLINE
NJM2870F
56dB
≤
RR (DC < f < 60kHz)
66dB typ. (f=100Hz)
60dB typ. (f=1kHz)
"Output
Noise Voltage
Vno=30µV typ.(Cp=0.01µF)
"Output
Current
Io(max.)=150mA
"High
Precision Output
Vo±2%
"Low
Dropout Voltage
∆V
I
-
O
=0.12V typ. (Io=60mA, Vo≥1.8V)
"Input
Voltage range
+2∼+14V (Vo=1.5V Version)
"ON/OFF
Control
(Active High)
"Output
capacitor with 4.7uF ceramic capacitor
"Internal
Short Circuit Current Limit
"Internal
Thermal Overload Protection
"Bipolar
Technology
"Package
Outline
SOT-23-5
!
PIN CONFIGURATION
5
4
1 2 3
NJM2870F
!
EQUIVALENT CIRCUIT
V
IN
Cont
Bandgap
Reference
PIN FUNCTION
1. CONTROL (Active High)
2. GND
3. NOISE BYPASS
4. V
OUT
5. V
IN
V
OUT
Thermal
Protection
Noise
Bypass
GND
NJM2870
!
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
+14
V
Control Voltage
V
CONT
+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.
!
ELECTRICAL CHARACTERISTICS (V
IN
=Vo+1V, C
IN
=0.1µF, Co=4.7µF, Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX.
Io=30mA
Output Voltage
Vo
+2%
−2%
−
Io=0mA, expect Icont
Quiescent Current
200
300
I
Q
−
Quiescent Current
100
I
Q(OFF)
V
CONT
=0V
−
−
at Control OFF
Output Current
Io
150
200
Vo−0.3V
−
Line Regulation
0.10
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
−
−
Load Regulation
0.03
∆Vo/∆Io
Io=0
∼
100mA
−
−
Dropout Voltage
0.12
0.2
∆V
I
-
O
Io=60mA
−
Ripple Rejection
ein=200mVrms,f=1kHz, Io=10mA
RR
60
−
−
V
IN
=Vo+2V, Vo=3V Version
Average Temperature
Ta=0∼85°C, Io=10mA,
0.2
∆Vo/∆Ta
−
−
Coefficient of Output Voltage
Vo=3V Version
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
30
−
−
Vo=3V Version
Control Voltage for ON-state
V
CONT(ON)
1.6
−
−
Control Voltage for OFF-state
V
CONT(OFF)
0.6
−
−
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.
!
ELECTRICAL CHARACTERISTICS
(Vo=1.5V Version, V
IN
=2.4V, C
IN
=0.1µF, Co=4.7µF, Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
Io=30mA
Output Voltage
Vo
−2%
Io=0mA, expect Icont
Quiescent Current
I
Q
−
Quiescent Current
I
Q(OFF)
V
CONT
=0V
−
at Control OFF
Output Current
Io
150
Vo−0.3V
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
−
Load Regulation
∆Vo/∆Io
Io=0
∼
100mA
−
Ripple Rejection
ein=200mVrms,f=1kHz, Io=10mA
RR
−
V
IN
=Vo+2V
Average Temperature
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
−
Coefficient of Output Voltage
Output Noise Voltage
V
NO
f=10Hz∼80kHz, Io=10mA,
−
Control Voltage for ON-state
V
CONT(ON)
1.6
Control Voltage for OFF-state
V
CONT(OFF)
−
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
mV/°C
µVrms
V
V
TYP.
−
200
−
200
−
−
64
0.13
15
−
−
MAX. UNIT
+2%
V
300
µA
100
nA
mA
−
0.10 %/V
0.03 %/mA
−
−
−
−
0.6
dB
mV/°C
µVrms
V
V
NJM2870
!
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM2870F15
1.5V
NJM2870F27
NJM2870F28
NJM2870F18
1.8V
NJM2870F19
1.9V
NJM2870F285
NJM2870F02
2.0V
NJM2870F29
NJM2870F21
2.1V
NJM2870F03
NJM2870F23
2.3V
NJM2870F31
NJM2870F24
2.4V
NJM2870F32
NJM2870F25
2.5V
NJM2870F33
NJM2870F26
2.6V
NJM2870F34
V
OUT
2.7V
2.8V
2.85V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
Device Name
NJM2870F35
NJM2870F36
NJM2870F38
NJM2870F04
NJM2870F45
NJM2870F46
NJM2870F47
NJM2870F48
NJM2870F05
V
OUT
3.5V
3.6V
3.8V
4.0V
4.5V
4.6V
4.7V
4.8V
5.0V
!
TEST CIRCUIT
A
V
IN
I
IN
+
0.1
µ
F
V
IN
V
OUT
+
NJM2870
4.7
µ
F
I
OUT
V
V
OUT
(tantalum)
A
V
V
CONT
I
CONT
CONTROL
NOISE
BYPASS
GND
Cp=0.01µF
NJM2870
!
TYPICAL APPLICATION
1
In case that ON/OFF Control is not required:
V
IN
0.1
µ
F
R
(0
∼
300kΩ)
V
IN
V
OUT
V
OUT
4.7
µ
F
(ceramic or tantalum)
NJM2870
NOISE
CONTROL BYPASS
GND
Cp=0.01µF
Connect control terminal to V
IN
terminal
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
V
OUT
4.7
µ
F
(ceramic or tantalum)
0.1
µ
F
R
NJM2870
CONTROL
NOISE
BYPASS
GND
Cp=0.01µF
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.
NJM2870
!
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2870F Power Dissipation
(Topr=-40½+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(℃)
单片机
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