NCP163AMX280TBG datasheet(10/13 Pages) ONSEMI

Part #	NCP163AMX280TBG

Description	250 mA, Ultra-Low Noise and High PSRR LDO Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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NCP163

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10

Reverse Current

The PMOS pass transistor has an inherent body diode

which will be forward biased in the case that VOUT > VIN.

Due to this fact in cases, where the extended reverse current

condition can be anticipated the device may require

additional external protection.

Power Supply Rejection Ratio

The NCP163 features very high Power Supply Rejection

ratio. If desired the PSRR at higher frequencies in the range

100 kHz – 10 MHz can be tuned by the selection of COUT

capacitor and proper PCB layout.

Turn−On Time

The turn−on time is defined as the time period from EN

assertion to the point in which VOUT will reach 98% of its

nominal value. This time is dependent on various

application conditions such as VOUT(NOM), COUT, TA.

PCB Layout Recommendations

To obtain good transient performance and good regulation

characteristics place CIN and COUT capacitors close to the

device pins and make the PCB traces wide. In order to

minimize the solution size, use 0402 or 0201 capacitors with

appropriate capacity. Larger copper area connected to the

pins will also improve the device thermal resistance. The

actual power dissipation can be calculated from the equation

above (Equation 2). Expose pad can be tied to the GND pin

for improvement power dissipation and lower device

temperature.

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