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NCP623 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. NCP623
Description  Ultra Low Noise 150 mA Low Dropout Voltage Regulator with ON/OFF Control
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP623 Datasheet(HTML) 6 Page - ON Semiconductor

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NCP623
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6
APPLICATION HINTS
Input Decoupling − As with any regulator, it is necessary
to reduce the dynamic impedance of the supply rail that
feeds the component. A 1.0
mF capacitor either ceramic or
tantalum is recommended and should be connected close to
the NCP623 package. Higher values will correspondingly
improve the overall line transient response.
Output Decoupling − Output capacitors exhibiting ESRs
ranging from a few m
W up to 3.0 W can safely be used. The
minimum decoupling value is 1.0
mF and can be augmented
to fulfill stringent load transient requirements. The regulator
works with ceramic chip capacitors as well as tantalum
devices.
Noise Performances − Unlike other LDOs, the NCP623
is a true low−noise regulator. With a 10 nF bypass capacitor,
it typically reaches 25
mVRMS overall noise between 100
Hz and 100 kHz. Spectral density graphics as well as noise
dependency versus bypass capacitor information is included
in this datasheet.
The bypass capacitor impacts the startup phase of the
NCP623 as depicted by the data−sheet curves. A typical
1.0 ms settling time is achieved with a 10 nF bypass
capacitor. However, due to its low−noise architecture, the
NCP623 can operate without bypass and thus offers a typical
20
ms startup phase. In that case, the typical output noise
stays lower than 65
mVRMS between 100 Hz − 100 kHz.
Protections − The NCP623 includes several protections
functions. The output current is internally limited to a
minimum of 175 mA while temperature shutdown occurs if
the die heats up beyond 150°C. These value lets you assess
the maximum differential voltage the device can sustain at
a given output current before its protections come into play.
The maximum dissipation the package can handle is given
by:
Pmax +
TJmax –TA
RqJA
If TJmax is internally limited to 150°C, then the NCP623 can
dissipate up to 595 mW @ 25°C.
The power dissipated by the NCP623 can be calculated
from the following formula:
Ptot + Vin @ Ignd(Iout) ) Vin * Vout @ Iout
or
Vinmax +
Ptot ) Vout @ Iout
Ignd ) Iout
If a 150 mA output current is needed, the ground current
is extracted from the data−sheet curves: 6.5 mA @ 150 mA.
For a NCP623NW28R2 (2.8 V), the maximum input voltage
will then be 6.48 V, a rather comfortable margin.
Typical Application − The following figure portraits the
typical application for the NCP623 where both input/output
decoupling capacitors appear.
Figure 2. A Typical NCP623 Application with
Recommended Capacitor Values (DFN6)
64
12
3
Input
Output
C3
1.0 mF
C2
1.0 mF
C1
10 nF
On/Off
NCP623
5
Figure 3. A Typical NCP623 Application with
Recommended Capacitor Values (Micro8)
87
5
12
4
Output
Input
C2
1.0 mF
C3
1.0 mF
C1
10 nF
On/Off
NCP623
6
3
NC NC


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