DEMO MANUAL DC2449A LT8335A 2A, 2MHz Low IQ Boost/ SEPIC/Inverting Converter Description Demonstration circuits 2449A-A and 2449A-B feature the The LT8335 includes user configurable undervoltage lock- LT 8335, in boost and inverting configurations. The demo out, frequency foldback, fixed 2MHz switching frequency circuits demonstrate small size and low component count. and it is easily configured as boost, SEPIC or inverting The boost is designed to convert a 3V10V source to 12V converter. at 275mA. The inverter converts a 4.5V13V source to The data sheet gives a complete description of the device, 12V at 350mA. Refer to Figures 4 and 5 for maximum operation and application information. The data sheet must load current at different input voltage levels. be read in conjunction with this demo manual for DC2449A. The LT8335 can operate with inputs as high as 25V, but Design files for this circuit board are available at in these demo circuits, the input is limited by the output DEMO MANUAL DC2449A Quick s tart p D Demo circuit 2449A is easy to set up to evaluate the 2. Turn on the power at the input. performance of the LT8335. Refer to Figures 1 and 2 for NOTE: Make sure that the input voltage does not exceed proper measurement equipment setup and follow the 10V for DC2449A-A and 13V for DC2449A-B. procedure below: 3. Check for the proper output voltage. NOTE: When measuring the input or output voltage ripple, If there is no output, temporarily disconnect the load care must be taken to avoid a long ground lead on the to make sure that the load is not set too high. oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or NOTE: VOUT and GND terminals. See Figure 3 for proper scope 4. Once the proper output voltages are established, adjust probe technique. the load within the operating range and observe the 1. With power off, connect the input power supply to VIN output voltage regulation, ripple voltage, efficiency and and GND. other parameters. I IN + I OUT + POWER V IN + SUPPLY + LOAD V OUT DC2449 F01 Figure 1. DC2449A-A Proper Equipment Setup dc2449af 2 + + ure roce