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PDF NJM2847 Data sheet ( Hoja de datos )
| Número de pieza | NJM2847 | |
| Descripción | Very Low Output Voltage Series Regulator | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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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, VO=0.8V version)
• Very Low Output Noise Voltage VNO=20µVrms typ. (Cp=0.01µF)
• Output Current
IO(max)=150mA
• High Precision Output
VO±1.0%
• Output Capacitor with 2.2µF ceramic capacitor
• ON/OFF Control
• Built-in Thermal Overload Protection and Short Circuit Current Limit Protection
• Bipolar Technology
• Package Outline
SC-88A
PIN CONNECTION
54
123
1. CONTROL
2. GND
3. NOISE BYPASS
4. VOUT
5. VIN
NJM2847F3
BLOCK DIAGRAM
VIN
Control
Bandgap
Reference
Thermal
Protection
VOUT
Noise
Bypass
GND
Ver.2013-04-03
-1-
1 page  
NJM2847
*Noise bypass Capacitor Cp
Noise bypass capacitor 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 recommended value larger (refer to conditions of ELECTRIC CHARACTERISTIC) to avoid the problem.
*Input Capacitor CIN
Input Capacitor CIN is required to prevent oscillation and reduce power supply ripple for applications when high
power supply impedance or a long power supply line.
Therefore, use the recommended CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and
should connect between GND and VIN as shortest path as possible to avoid the problem.
*Output Capacitor CO
Output capacitor (CO) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.
Use of a smaller CO may cause excess output noise or oscillation of the regulator due to lack of the phase
compensation.
On the other hand, Use of a larger CO reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended CO value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger
and should connect between GND and VOUT as shortest path as possible for stable operation
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature
characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough.
When selecting CO, recommend that have withstand voltage margin against output voltage and superior temperature
characteristic though this product is designed stability works with wide range ESR of capacitor including low ESR
products.
Ver.2013-04-03
-5-
5 Page 
Typical Characteristics
NJM2847_1.2v
ON/OFF Transient Response without Load
7
@:Ta=25°C
VIN=2.5V
6 CO=2.2µF(Ceramic)
Cp=0.01mF
5
Control Voltage
4
3
2 Output Voltage
1
0
-1
0
1
23
Time t(s)
4
10
5
0
-5
-10
-15
-20
-25
-30
5
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
0
NJM2847_1.2v
Load Transient Response
@:Ta=25°C
VIN=2.5V
CO=2.2µF(Ceramic
)
Output Current
150
100
50
0
Output Voltage
-50
-100
-150
-200
-250
40 80 120 160 200
Time t(µs)
NJM2847
7
6
5
4
3
2
1
0
-1
0
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
0
NJM2847_1.2v
ON/OFF Transient Response
10
5
Control Voltage
@:Ta=25°C
VIN=2.5V
CO=2.2µF(Ceramic)
Cp=0.01µF
IO=30mA
0
-5
-10
Output Voltage
-15
-20
-25
-30
4 8 12 16 20
Time t(ms)
NJM2847_1.2v
Input Transient Response
4
Input Voltage
@:Ta=25°C
CO=2.2µF(Ceramic)
IO=30mA
3
2
1
Output Voltage
0
-1
-2
-3
-4
40 80 120 160 200
Time t(µs)
Ver.2013-04-03
[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.
- 11 -
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJM2847.PDF ] | |
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