SLVSEX0A March 2019 – July 2019
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.2.1.2.1 Programming the Output Voltage
Output voltage is programmed via external resistor divider. By selecting the external resistor divider R1 and R2, as shown in Equation 1, the output voltage is programmed to the desired value. When the output voltage is regulated, the typical voltage at the FB pin is VREF of 800 mV.
Equation 1. 
where
- VOUT is the desired output voltage
- VREF is the internal reference voltage at the FB pin
For best accuracy, R2 should be kept smaller than 150 kΩ to ensure the current flowing through R2 is at least 100 times larger than the FB pin leakage current. Changing R2 towards a lower value increases the immunity against noise injection. Changing the R2 towards a higher value reduces the quiescent current for achieving higher efficiency at low load currents.