LP87702-Q1: Set switching frequency

Jimmy,

Thanks for your question. I have assigned this thread to the experts on the LP87702-Q1 PMIC, but due to the holidays please be patient in getting a response. I expect that someone will answer on Monday, January 4th.

Jimmy,

To prevent you from waiting too long, I took a look at the datasheet for the LP87702-Q1 and it says the following:

"ƒSW = Switching frequency, PWM mode, OTP programmable"

Please refer to the Technical Reference Manual (TRM) for each orderable part number and it will tell you the switching frequency that was programmed into the OTP memory:

• LP877020-Q1 Technical Reference Manual: switching frequency for Buck and Boost regulators = 4 MHz
• LP87702D-Q1: TRM not available in Technical documents. Need to wait for device experts to provide answer here.
• LP87702K-Q1: TRM not available in Technical documents. Need to wait for device experts to provide answer here.

You can also modify the switching frequency during run-time operation by writing I2C commands to Register 0x31 (FREQ_SEL):

• BOOST_FREQ_SEL = bit 2: 0b = 2 MHz, 1b = 4 MHz
• BUCK_FREQ_SEL = bits 1-0: 00b = 2 MHz, 01b = 3 MHz, 10b = 4 MHz, 11b = 4 MHz