MCP1665 12V Output Boost Regulator Evaluation Board User’s Guide

DS50002686A-page 16

 2017 Microchip Technology Inc.

FIGURE 2-7:

MCP1665 PFM (MODE =HIGH) to Skipping (MODE=LOW)

Transition at 12V Output 5V Input 10 mA Load.

FIGURE 2-8:

MCP1665 Skipping (MODE=LOW) to PFM (MODE =HIGH)

Transition at 12V Output 5V Input 10 mA Load.

2.4

BATTERY CONSIDERATIONS

When considering the power solution for this design, select a battery carefully. The

battery should be able to sustain the boost converter’s input voltage even under the

heaviest load expected. Currents in excess of 3 amps can be drawn by the MCP1665

boost converter’s input and the power supply should be able to sustain its voltage.

Weak batteries may cause the MCP1665 input voltage to drop under the UVLO

threshold and force the converter to work intermittently. Lithium and nickel cells are

recommended. Input connections should be kept short and thick to maintain the boost

converter’s performance within the expected range.

MODE pin 5V/div

MODE pin 5V/div