SLLSEU8B March 2017 – May 2020 TPD2S703-Q1
PRODUCTION DATA.
To operate in Mode 1, ensure that Rtop || Rbot, resistance between the MODE pin and ground, is greater than 14 kΩ. This is accomplished by insuring Rtop || Rbot > 14 kΩ because when the device is initially powered up, VREF is at ground until the internal circuitry recognizes if the device is in Mode 1 or Mode 2.
In Mode 1, VREF is set by using an internal regulator to set the voltage. Using a resistor divider off of a feedback comparator is how to set VREF, similar to a standard LDO or DC/DC. VREF is set in Mode 1 according to Equation 5.
Equation 5 yields the typical value for VREF. When using ±1% resistors RTOP and RBOT, VREF accuracy is going to be ±5%. Therefore, the minimum and maximum values for VREF can be calculated off of the typical VREF. The parametric tables above give example RTOP and RBOT resistors to use for standard output VREF voltages for Mode 1.