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 operation at high temperatures, ensure that the device is operated within its specified temperature range (up to 150°C for the NCP186AMX180TAG). Use a suitable thermal interface material (TIM) between the device and the heat sink, and ensure good airflow around the device. Monitor the device's junction temperature (TJ) and adjust the operating conditions accordingly.
Critical parameters to monitor during operation include the input voltage (VIN), output voltage (VOUT), output current (IOUT), and junction temperature (TJ). Monitoring these parameters helps prevent overvoltage, undervoltage, overcurrent, and overheating, which can damage the device or affect its performance.
To handle power sequencing and startup, ensure that the input voltage (VIN) is applied before the enable signal (EN). The device has an internal soft-start circuit that ramps up the output voltage (VOUT) gradually to prevent inrush currents. The enable signal (EN) can be tied to VIN or a separate voltage source, depending on the application requirements.
The recommended input capacitor is a 10uF to 22uF ceramic capacitor with a voltage rating of 10V or higher. The recommended output capacitor is a 10uF to 22uF ceramic capacitor with a voltage rating of 1.8V or higher. The capacitor values and types may vary depending on the specific application requirements and operating conditions.
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NCP186AMX180TAG Overview
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