NJM2881/82
LOW DROPOUT VOLTAGE REGULATOR
!
GENERAL DESCRIPTION
NJM2881/82 is a low dropout voltage regulator with ON/OFF
control.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
It is mounted on SOT-23-5 as small package and 1.0µF ceramic
capacitor is available. Therefore it is suitable for cellular phone,
camcorder, IC decoder, camera, and other portable items.
!
FEATURES
"
High Ripple Rejection
75dB typ. (f=1kHz ,Vo=3V version)
"
Low Output Noise Voltage Vno=30µVrms (Cp=0.01µF)
"
Output capacitor with 1.0µF ceramic capacitor (Vo≥2.7V)
"
Output Current
Io(max.)=300mA
"
High Precision Output
Vo±1.0%
"
Low Dropout Voltage
0.10V typ. (Io=100mA)
(Active High)
"
ON/OFF Control
"
Internal Short Circuit Current Limit
"
Internal Thermal Overload Protection
"
Bipolar Technology
"
Package Outline
SOT-23-5
!
PIN CONFIGURATION
5
4
!
PACKAGE OUTLINE
NJM2881/82F
1 2 3
1.
2.
3.
4.
5.
CONTROL (Active High)
GND
NOISE BYPASS
V
OUT
V
IN
5
4
1 2 3
1.
2.
3.
4.
5.
V
IN
GND
CONTROL (Active High)
NOISE BYPASS
V
OUT
NJM2881F
NJM2882F
!
EQUIVALENT CIRCUIT
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
Noise
Bypass
GND
Ver.2006-02-22
-1-
NJM2881/82
!
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJM288*F15
1.5V
NJM288*F29
NJM288*F17
1.7V
NJM288*F03
NJM288*F18
1.8V
NJM288*F31
NJM288*F21
2.1V
NJM288*F32
NJM288*F25
2.5V
NJM288*F33
NJM288*F28
2.8V
NJM288*F345
NJM288*F285
2.85V
NJM288*F35
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
V
OUT
2.9V
3.0V
3.1V
3.2V
3.3V
3.45V
3.5V
Device Name
NJM288*F38
NJM288*F04
NJM288*F43
NJM288*F47
NJM288*F05
V
OUT
3.8V
4.0V
4.3V
4.7V
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
∼
+6V (In case of Vo<2.1V)
!
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
Output Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Line Regulation
Load Regulation
Dropout Voltage
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
NO
V
CONT(ON)
V
CONT(OFF)
TEST CONDITION
Io=30mA
Io=0mA, except Icont
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
300mA
Io=100mA
ein=200mVrms,f=1kHz,Io=10mA,
Vo=3V version
Ta=0
∼
85°C, Io=10mA
f=10Hz
∼
80kHz, Io=10mA, Vo=3V version
MIN.
-1.0%
-
-
300
-
-
-
-
-
-
1.6
-
TYP.
-
120
-
400
-
-
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
-2-
Ver.2006-02-22
NJM2881/82
!
ELECTRICAL CHARACTERISTICS
(Vo≤2.0V version: V
IN
=Vo+1V, C
IN
=0.1µF, Co=2.2µF: Vo≥1.9V (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
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
RR
∆Vo/∆Ta
V
NO
V
CONT(ON)
V
CONT(OFF)
Io=30mA
TEST CONDITION
Io=0mA, except I
CONT
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
300mA
ein=200mVrms,f=1kHz,Io=10mA,
Vo=1.8V version
Ta=0
∼
85°C, Io=10mA
f=10Hz
∼
80kHz, Io=10mA, Vo=1.8V version
MIN.
-1.0%
-
-
300
-
-
-
-
-
1.6
-
TYP.
-
120
-
400
-
-
80
±
50
20
-
-
MAX.
+1.0%
180
100
-
0.10
0.03
-
-
-
-
0.6
UNIT
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.
!
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
I
OUT
V
OUT
V
0.1
µ
F
NJM2881/82
1.0
µ
F
*4
(ceramic)
A
V
CONT
I
CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01
µ
F
V
*4 1.9V
≤
Vo
≤
2.6V version: Co=2.2µF(ceramic)
Vo
≤
1.8V version: Co=4.7
µ
F(ceramic)
Ver.2006-02-22
-3-
NJM2881/82
!
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
IN
0.1µF
1.0µF
*5
NJM2881/82
R
(0∼300kΩ)
CONTROL
GND
NOISE
BYPASS
Cp=0.01µF
V
IN
V
OUT
V
OUT
*5 1.9V
≤
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
NJM2881/82
1.0
µ
F
*5
CONTROL
GND
NOISE
BYPASS
Cp=0.01
µ
F
*5 1.9V
≤
Vo
≤
2.6V version: Co=2.2
µ
F
Vo
≤
1.8V version: Co=4.7
µ
F
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.2006-02-22
NJM2881/82
!
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2881/82F 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.2006-02-22
-5-
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