Datasheet LT3002 (Analog Devices) - 10

LT3002
APPLICATIONS INFORMATION
Determine the UVLO thresholds and calculate R2 resistor
Step 10: Ensure minimum load.
value: The theoretical minimum load can be approximately esti- 1.228V • R ( 1+R2) mated as: VIN(UVLO+)= + 2.5µA •R1 R2 9µH • (1.04A)2 •12.7kHz I =12.4mA Example: LOAD(MIN) = 2 • 5V Set VIN UVLO rising threshold to 7.5V: Remember to check the minimum load requirement in R2 = 232k real application. The minimum load occurs at the point V where the output voltage begins to climb up as the con- IN(UVLO+) = 7.5V verter delivers more energy than what is consumed at VIN(UNLO–) = 5.5V the output. The real minimum load for this application is about 10mA. In this example, a 500Ω resistor is selected as the minimum load. Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description