NJM2847
Very Low Output Voltage Series Regulator
GENERAL DESCRIPTION
The NJM2847 is a series voltage regulator that delivers up to
150mA output current with the output voltage of 0.8 to 1.4V with
ON/OFF control.
Advanced Bipolar technology achieves low noise, high ripple rejection,
High accuracy and low quiescent current.
Small packaging and 2.2µF small decoupling capacitor make
the NJM2847 suitable for space conscious applications.
PACKAGE OUTLINE
NJM2847F3
FEATURES
•
Output Voltage Range
0.8V to 1.4V
•
Input Voltage Range
2.3V to 9.0V
•
High Ripple Rejection
85dB typ. (f=1kHz, V
O
=0.8V version)
•
Very Output Noise Voltage
V
NO
=20µVrms typ. (Cp=0.01µF)
•
Output Current
I
O
(max)=150mA
•
High Precision Output
V
O
±1.0%
•
Output Capacitor with 2.2µF ceramic capacitor (V
O
>1.0V)
•
ON/OFF Control
•
Built-in Thermal Overload Protection and Short Circuit Current Limit Protection
•
Bipolar Technology
•
Package Outline
SC-88A
PIN CONNECTION
5
4
1 2 3
1.
2.
3.
4.
5.
CONTROL
GND
NOISE BYPASS
V
OUT
V
IN
NJM2847F3
BLOCK DIAGRAM
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
Noise
Bypass
GND
Ver.2008-11-07
-1-
NJM2847
OUTPUT VOLTAGE LANK LIST
The WHITE column shows applicable Voltage Rank(s).
V
out
Device Name
NJM2847F3 -008
0.8V
NJM2847F3 -009
0.9V
NJM2847F3 -010
1.0V
NJM2847F3 -011
1.1V
NJM2847F3 -012
1.2V
NJM2847F3 -013
1.3V
NJM2847F3 -014
1.4V
Output Voltage Range: 0.8V to 1.4V (0.1V step)
ABABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
+10
V
Control Voltage
V
CONT
+10
V
Power Dissipation
P
D
250(*1)
mW
Operating Temperature
Topr
- 40
∼
+85
°C
Storage Temperature
Tstg
- 40
∼
+125
°C
Note1:
EIA/JEDEC STANDARD Test board (76.2*114.3*1.6mm, 2layers, FR-4) mounting
BIAS VOLTAGE INPUT RANGE
V
IN
=+2.3
∼
+9V
ELECTRICAL CHARACTERISTICS
(V
IN
=2.5V, C
IN
=0.1µF, Co=2.2µF, Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
Output Voltage
Vo
Io=30mA
-1.0%
−
Input Voltage
V
IN
2.3
−
Quiescent Current
I
Q
Io=0mA, except Icont
140
−
Quiescent Current
I
Q(OFF)
V
CONT
=0V
−
−
at Control OFF
Output Current
Io
150
200
Vo
×0.9V
Line Regulation
∆Vo/∆V
IN
V
IN
=2.5V to 9.0V, Io=30mA
−
−
Load Regulation
∆Vo/∆Io
Io=0mA to 100mA
−
−
Io=60mA
0.10
Dropout Voltage
−
∆V
I-O
ein=200mVrms, f=1kHz, Io=10mA,
Ripple Rejection
RR
85
−
Vo=0.8V version
Average Temperature
∆Vo/∆Ta
Ta=0°C to +85°C, Io=10mA
−
±
50
Coefficient of Output Voltage
f=10Hz to 80kHz, Io=10mA,
Output Noise Voltage
V
NO
20
−
Vo=0.8Vversion
Control Current
I
CONT
V
CONT
=1.6V
3
−
Control Current for ON-state
V
CONT(ON)
1.6
−
Control Current for OFF-state V
CONT(OFF)
−
−
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.
MAV.
+1.0%
9
200
100
−
0.10
0.03
0.18
−
−
−
12
−
0.6
UNIT
V
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
µA
V
V
-2-
Ver.2008-11-07
NJM2847
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
I
OUT
0.1
µ
F
NJM2847
2.2
µ
F
(Ceramic)
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
NOISE
BYPASS
Cp=0.01
µ
F
TYPICAL APPLICATION
a) In case of where ON/OFF control is not required:
V
IN
0.1
µ
F
V
IN
V
OUT
V
OUT
NJM2847
R
CONTROL
GND
NOISE
BYPASS
2.2
µ
F
Cp=0.01
µ
F
You shall connect control terminal to V
IN
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".
Ver.2008-11-07
-3-
NJM2847
b) In use of ON/OFF control:
V
IN
V
IN
V
OUT
V
OUT
0.1
µ
F
R
NJM2847
2.2
µ
F
CONTROL
GND
NOISE
BYPASS
Cp=0.01
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.
* Input Capacitance C
IN
Input Capacitance C
IN
is required to prevent oscillation and reduce power supply ripple for applications with high
power supply impedance or a long power supply line.
Use the C
IN
value of 0.1µF greater to avoid the problem.
C
IN
should connect between GND and V
IN
as short as possible.
* 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.
[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.
-4-
Ver.2008-11-07
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