NCV8702
APPLICATIONS INFORMATION
General
capacitor will limit the influence of input trace inductance
The NCV8702 is a high performance 200 mA Low
Dropout Linear Regulator. This device delivers excellent
noise and dynamic performance.
and source resistance during sudden load current changes.
Larger input capacitor may be necessary if fast and large
load transients are encountered in the application.
Thanks to its adaptive ground current feature the device
consumes only 10 mA of quiescent current at no−load
condition.
Output Decoupling (COUT
)
The NCV8702 is designed to be stable with a small 1.0 mF
ceramic capacitor on the output. To assure proper operation
it is strongly recommended to use min. 1.0 mF capacitor with
the initial tolerance of 10%, made of X7R or X5R dielectric
material types.
The regulator features ultra−low noise of 11 mV
,
RMS
PSRR of 68 dB at 1 kHz and very good load/line transient
performance. Such excellent dynamic parameters and small
package size make the device an ideal choice for powering
the precision analog and noise sensitive circuitry in portable
applications. The LDO achieves this ultra low noise level
output without the need for a noise bypass capacitor.
A logic EN input provides ON/OFF control of the output
voltage. When the EN is low the device consumes as low as
typ. 10 nA from the IN pin.
There is no requirement for the minimum value of
Equivalent Series Resistance (ESR) for the C
but the
OUT
maximum value of ESR should be less than 700 mW.
Larger output capacitors could be used to improve the load
transient response or high frequency PSRR as shown in
typical characteristics. The initial tolerance requirements
can be wider than 10% when using capacitors larger than
1 mF.
The LDO achieves ultra−low output voltage noise without
the need for additional noise bypass capacitor.
It is not recommended to use tantalum capacitors on the
output due to their large ESR. The equivalent series
resistance of tantalum capacitors is also strongly dependent
on the temperature, increasing at low temperature. The
tantalum capacitors are generally more costly than ceramic
capacitors.
The device is fully protected in case of output overload,
output short circuit condition and overheating, assuring a
very robust design.
Input Capacitor Selection (CIN)
It is recommended to connect a minimum of 1 mF Ceramic
X5R or X7R capacitor close to the IN pin of the device. This
capacitor will provide a low impedance path for unwanted
AC signals or noise modulated onto constant input voltage.
There is no requirement for the min./max. ESR of the
input capacitor but it is recommended to use ceramic
capacitors for their low ESR and ESL. A good input
The table on this page lists the capacitors which were used
during the IC evaluation.
No−load Operation
The regulator remains stable and regulates the output
voltage properly within the 2% tolerance limits even with
no external load applied to the output.
V
V
OUT
IN
OUT
0 mA ... 200 mA
2 V ... 5.5 V
IN
NCV8702
C2
C1
EN
GND
U1
Figure 61. Typical Applications Schematics
LIST OF RECOMMENDED CAPACITORS:
Symbol
Manufacturer
Kemet
Part Number
C0402C105K8PACTU
C1005X5R1A105K
GRM155R61A105KE15D
0402ZD105KAT2A
MCCA000571
Description
1 mF Ceramic 10%, 10 V, 0402, X5R
TDK
−||−
Murata
−||−
C1, C2
AVX
−||−
Multicomp
Panason − ECG
1 mF Ceramic 10%, 50 V, 1206, X7R
4.7 mF Ceramic 20%, 6.3 V, 0402, X5R
ECJ−0EB0J475M
http://onsemi.com
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