NJM2841
Very Low Output Low Dropout Regulator
GENERAL DESCRIPTION
The NJM2841 is a low output voltage, low drop out
regulators.
It delivers up to 500mA output current with the output
voltage of 0.8 to 2.5V.
The use of an external bias voltage can improve the
transient response and the ripple rejection characteristics
while maintaining minimum input to output voltage.
PACKAGE OUTLINE
NJM2841F
FEATURES
•
Output Voltage Range
0.8V to 2.5V
•
High Ripple Rejection
86 dB typ. (f=1kHz, V
O
=1.2V version )
•
Output Noise Voltage
V
NO
=40
µVrms(
V
O
=1.2V version )
•
Output Current
I
O
(max)=500mA
•
High Precision Output
V
O
±1.0%
•
Dual Supply Voltage Type
V
IN
, V
BIAS
(sequence free)
•
High Stability for Load
0.002%/mA (max)
•
Output Capacitor with 4.7µF ceramic capacitor
•
Low Dropout Voltage
0.1V typ. @I
O
=300mA
•
ON/OFF Control
•
Built-in Thermal Overload Protection and Short Circuit Current Limit Protection
•
Bipolar Technology
•
Package Outline
SOT-23-5(MTP5)
PIN CONNECTION
5
4
1 2 3
1.
2.
3.
4.
5.
CONTROL
GND
V
OUT
V
IN
V
BIAS
BLOCK DIAGRAM
V
IN
V
BIAS
Thermal
Protection
Bandgap
Reference
V
OUT
CONTROL
Over Current
Protection
GND
Ver.2010-11-26
-1-
NJM2841
Device Name
NJM2841F008
NJM2841F017
0.8V
NJM2841F009
NJM2841F018
0.9V
NJM2841F010
NJM2841F019
1.0V
NJM2841F011
NJM2841F020
1.1V
NJM2841F012
NJM2841F021
1.2V
NJM2841F013
NJM2841F022
1.3V
NJM2841F014
NJM2841F023
1.4V
NJM2841F015
NJM2841F024
1.5V
NJM2841F016
NJM2841F025
1.6V
Output Voltage Range: 0.8V to 2.5V (0.1V step)
ABABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
SYNBOL
Input Voltage
V
IN
Bias Voltage
V
BIAS
Control Voltage
V
CONT
OUTPUT VOLTAGE LANK LIST
V
out
Device Name
V
out
1.7V
1.8V
1.9V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
RATINGS
+10
+10
+10
480 (Note1)
Power Dissipation
P
D
250 (Note2)
Operating Temperature
Topr
-40∼+85
Storage Temperature
Tstg
-50∼+150
Note1:
EIA/JEDEC STANDARD Test board (76.2*114.3*1.6mm, 2layers, FR-4) mounting
Note2: Devise itself
UNIT
V
V
V
mW
°C
°C
BIAS VOLTAGE INPUT RANGE
V
BIAS
= +2.5V to +10V (V
O
<1.5V)
V
BIAS
= +V
O
+1V to +10V (V
O
≥1.5V)
-2-
Ver.2010-11-26
NJM2841
ELECTRICAL CHARACTERISTICS
(V
BIAS
=2.5V(Vo
≥
1.5V : V
BIAS
=Vo+1V), V
IN
=Vo+1V, C
BIAS
=0.1
µ
F, C
IN
=4.7
µ
F, Co=4.7
µ
F, Ta=25˚C)
PARAMETER
Output Voltage
Unloaded Bias Current
Unloaded Input Current
Bias Current at Control OFF
Input Current at Control OFF
Output Current
Line Regulation 1 (V
BIAS
)
Line Regulation 2 (V
IN
)
Load Regulation
Dropout Voltage
Ripple Rejection Ratio 1 (V
BIAS
)
Ripple Rejection Ratio 2 (V
IN
)
Average Temperature Coefficient
of Output Voltage
Output Noise Voltage
Control Current
Control Voltage for ON-state
Control Voltage for OFF-state
Bias Voltage
Input Voltage
•
Table1
Voltage
Rank
SYMBOL
V
O
I
BIAS
I
IN
I
BIAS(OFF)
I
IN(OFF)
I
O
∆
V
O
/
∆
V
BIAS
∆
V
O
/
∆
V
IN
∆
V
O
/
∆
I
O
∆
V
I-O
TEST CONDITION
I
O
=30mA
I
O
=0mA, except I
CONT
I
O
=0mA, except I
CONT
V
CONT
=0V
V
CONT
=0V
V
O
x 0.9V
V
BIAS
=2.5V to V
O
+6V(V
O
<1.5V)
V
BIAS
=V
O
+1V to V
O
+6V(V
O
≥1.5V)
I
O
=30
mA
V
IN
=V
O
+1V to V
O
+6V, I
O
=30
mA
MIN.
-1.0%
-
-
-
-
500
-
-
-
-
TYP.
-
180
-
-
-
650
-
-
-
0.10
MAX.
+1.0%
300
20
100
100
-
0.10
0.10
0.002
0.18
UNIT
V
µ
A
µ
A
nA
nA
mA
%/V
%/V
%/mA
V
dB
dB
I
O
=30 to 500mA
I
O
=300mA
V
BIAS
=3.5V, e
BIAS
=200mVrms,
RR1(V
BIAS
)
f=1kHz, I
O
=10mA
e
IN
=200mVrms, f=1kHz,
RR2(V
IN
)
I
O
=10mA
∆
V
O
/
∆
Ta
Refer to Table 1
Refer to Table 1
-
±
50
Ta=0 to +85
°
C, I
O
=10mA
f=10Hz to 80kHz, I
O
=10mA
V
CONT
=1.6V
-
ppm/
°
C
µ
Vrms
µ
A
V
V
V
V
V
NO
I
CONT
I
CONT(ON)
V
CONT(ON)
V
BIAS
V
IN
Refer to Table 1
-
3
12
1.6
-
-
-
-
0.6
-
-
10
-
-
9
MIN.
-
-
-
-
-
-
RR1(V
BIAS
)
TYP.
MAX.
80
80
79
77
75
70
-
-
-
-
-
-
UNIT
MIN.
-
-
-
-
-
-
RR2(V
IN
)
TYP.
MAX.
87
87
87
86
85
75
-
-
-
-
-
-
UNIT
MIN.
-
-
-
-
-
-
V
NO
TYP.
MAX.
27
30
34
40
48
75
-
-
-
-
-
-
UNIT
0.8V
0.9V
1.0V
1.2V
1.5V
2.5V
dB
dB
µ
Vrms
Ver.2010-11-26
-3-
NJM2841
TEST CIRCUIT
I
BIAS
V
BIAS
A
V
BIAS
V
IN
A
4.7µF
I
IN
0.1µF
I
CONT
NJM2841
V
IN
A
V
V
CONT
CONTROL
GND
V
OUT
4.7µF
(Ceramic)
I
OUT
V
V
OUT
TYPICAL APPLICATION
a) In case of where ON/OFF control is not required:
V
BIAS
0.1µF
V
BIAS
V
IN
V
IN
4.7µF
NJM2841
R
CONTROL
GND
V
OUT
V
OUT
4.7µF
(ceramic)
You shall connect control terminal to V
BIAS
terminal.
Though the I
CONT
decreases by inserting "R" to between Control terminal and V
BIAS
terminal, the minimum operating voltage is
increased due to the resister "R".
-4-
Ver.2010-11-26
NJM2841
b) In use of ON/OFF control:
V
BIAS
V
BIAS
V
IN
V
IN
0.1µF
R
NJM2841
4.7µF
CONTROL
GND
V
OUT
V
OUT
4.7µF
State of control terminal:
“H”
→
output is enabled.
“L” or “open”
→
output is disabled.
Regarding a Bias Capacitance (C
BIAS
) and an Input Capacitance (C
IN
)
C
BIAS
and C
IN
have the effect that prevents the oscillation at the time of the following condition.
When Source impedance is high.
When V
IN
and/or GND line is long.
Therefore, you shall connect the C
BIAS
and C
IN
that recommendation value or larger (C
BIAS
≥
0.1
µ
F, C
IN
≥
4.7
µ
F) so that
lines that V
BIAS
-GND and V
IN
-GND become as short as possible.
Ver.2010-11-26
-5-
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