1.1.2 Buck Regulators Sub-Modules Power-up Procedure

The following procedure applies for BBS2: MCP16311 Buck Regulator and BBS7: MCP16331 Buck Regulator. To power-up each board follow these steps:

  1. Connect the power supply to the input terminals of the BBS sub-module (see Figure 1-2). The input voltage should be higher than the output voltage (for more information, refer to Table 1-1).
  2. Connect the load to the VOUT and GND terminals; connect the (+) side of the load to the VOUT terminal and the (-) side of the load to the GND terminal of the board (see Figure 1-2). The maximum load varies with the input and output voltage (refer to the Data Sheet for more information on the maximum load). By default, the EN pin is pulled high through a resistor.
  3. When the power supply is turned on, a voltmeter can be used to monitor VOUT. The measured output voltage should be very close to the nominal value, with a variation of ±5% in PFM mode and ±2% in PWM mode. Adjusting the input voltage and load should not cause the output to vary more than a few mV over the operating range of the converter.
Figure 1-2. BBS2: MCP16311 Buck Regulator Test Setup Example