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PDF NJM2842 Data sheet ( Hoja de datos )
| Número de pieza | NJM2842 | |
| Descripción | Very Low Output Low Dropout Regulator | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJM2842
Very Low Output Low Dropout Regulator
GENERAL DESCRIPTION
The NJM2842 is a very low output voltage, low drop out
regulators.
It delivers up to 1A output current with the output voltage from
0.8V to 1.8V.
The use of an external bias voltage can improve the
transient response and the ripple rejection characteristics while
maintaining minimum input to output voltage.
The NJM2842 suitable for constant-voltage source such as
CPU, DSP and ASIC.
PACKAGE OUTLINE
NJM2842U2
NJM2842KH1
FEATURES
• Output Voltage Range
:0.8V to 1.8V
• High Ripple Rejection
• Output Noise Voltage
• Output Current
• High Precision Output
• Dual input Voltage Type
• High Stability for Load
:91 dB typ.@VO=1.2V
:VNO=44 µVrms.typ@VO=1.2V
:IO(min)=1.0A
:VO±1.0%
:VIN, VBIAS (sequence free)
:0.002%/mA (max)
• Output Capacitor with 4.7µF ceramic capacitor
• Low Dropout Voltage
• ON/OFF Control
:0.1V typ. @IO=600mA
• Built-in Thermal Overload Protection and Current Limit Protection
• Bipolar Technology
• Package Outline
SOT89-5, ESON6-H1, TO252-5
NJM2842DL3
PIN CONNECTION
524
123
1. CONTROL
2. GND
3. VOUT
4. VIN
5.VBIAS
NJM2842U2
6 54
12
1 23
65
NJM2842KH1
3
1. VIN
2. VBIAS
3. N.C.
4. CONTROL
5. GND
4 Exposed Pad 6. VOUT
Connected to GND
3
1. CONTROL
2. VOUT
3. GND
4. VIN
5.VBIAS
12345
NJM2842DL3
BLOCK DIAGRAM
VIN
VBIAS
CONTROL
Bandgap
Reference
Thermal
Protection
VOUT
GND
Over Current
Protection
Ver.2012-02-27
-1-
1 page  
NJM2842
*In the case of using a resistance "R" between VBIAS and control.
If this resistor is inserted, it can reduce the control current when the control voltage is high.
The applied voltage to control terminal should set to consider voltage drop through the resistor “R” and the minimum
control voltage for ON-state.
The VCONT (ON) and ICONT have temperature dependence as shown in the "Control Current vs. Temperature" and "
Control Voltage vs. Temperature" characteristics. Therefore, the resistance "R" should be selected to consider the
temperature characteristics.
* Bias Capacitance (CBIAS) andanInput Capacitance (CIN)
CBIAS and CIN are 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 CBIAS and CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between VBIAS-GND and VIN-GND 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.
Ver.2012-02-27
-5-
5 Page 
NJM2842
Ver.2012-02-27
[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 NJM2842.PDF ] | |
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