Description:1.8 V to 5.5 V Operating Input Voltage Range; Several Fixed Output Voltage Options and others available upon request in range from 1.2 V to 3.9 V; Low Quiescent Current of Typ. 90 µA; Very Low Dropout: 100 mV Typ. at Iout = 1 A (3.0V version); High 75 dB at 1 kHz PSRR; Internal Soft-Start; ±1.0% Accuracy in -40 to 85degC temperature range; Thermal Shutdown and Current Limit Protections; Stable with Small 1 µF Ceramic Capacitors
A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, and ensuring good thermal conductivity between the device and the PCB. A 2-layer or 4-layer PCB with a solid ground plane is recommended. Avoid placing thermal vias under the device, and keep the thermal pad clear of any components or traces.
To ensure reliable startup and shutdown, ensure that the input voltage rises and falls monotonically, and that the input voltage is within the recommended operating range. Also, ensure that the output capacitor is properly sized and placed close to the device to minimize inductance and ensure stable operation.
The recommended input capacitor value is 10uF to 22uF, with an X5R or X7R dielectric. The capacitor should be placed as close to the device as possible, and should have a low ESR (Equivalent Series Resistance) to minimize voltage ripple and ensure stable operation.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESR) / (f * C), where ΔVout is the output voltage ripple, Iout is the output current, ESR is the equivalent series resistance of the output capacitor, f is the switching frequency, and C is the output capacitance.
The maximum ambient temperature for the NCP186AMX330TAG is 85°C, with a maximum junction temperature of 150°C. Ensure that the device is operated within these temperature limits to ensure reliable operation and to prevent overheating.
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NCP186AMX330TAG Overview
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