DEMO MANUAL DC2177A-C LT3063 45V VIN, Micropower, Low Noise, 200mA LDO with Output Discharge DESCRIPTION Demonstration circuit 2177A-C features the LT 3063, a The LT3063 saves energy by being micropower and low micropower, low noise and low dropout voltage linear dropout. The LT3063 has excellent regulation and fast regulator with output discharge. The input voltage ranges response to load transients and also tolerates wide input from 2.1V to 45V and the maximum output current is voltage variations and discharges its output in a controlled 200mA. A resistor divider determines the output voltage, manner as required by some image sensor loads. and a jumper adjusts the divider to set the output voltage The LT3063 targets systems with inputs that are battery- to either 1.2V, 1.5V, 1.8V, 2V, 2.5V, 3.3V, 5V or a voltage powered or have multiple sources, especially those with that is user-programmed but requires the installation of sensitive loads. DC2177A-C features the LT3063 in the a resistor. The output uses a 10F ceramic capacitor and 8-lead 2mm 3mm DFN package. The LT3063 data sheet the internal reference is bypassed with a 10nF capacitor must be read in conjunction with this demo manual to to reduce output noise and program the soft-start. There properly use or modify demo circuit DC2177A-C. is also a 10nF feedforward capacitor to improve load Design files for this circuit board are available at transient response and decrease noise at higher output DEMO MANUAL DC2177A-C QUICK START PROCEDURE To use DC2177A-C to evaluate the performance of the 3. Increase the load to the desired output current. Verify LT3063, refer to Figure 1 for the proper measurement that the V voltage is as programmed by the jumper. OUT equipment setup and follow the procedure below: Note: If the output voltage is low, temporarily disconnect 1. With the input supply and load off and turned down, the load to make sure that it is not set too high. make all connections according to Figure 1. Make sure 4. Once the proper output voltage is established, adjust the the jumper to set VOUT is in the proper position for the input voltage and load within the operating range and desired output voltage and the VOUTEN jumper is in observe the output voltage regulation, low quiescent the ON position. current, shutdown, output discharge operation and 2. Turn on the input supplies and increase them to the other parameters. desired input voltages. Note When Setting The Input Voltage: An input voltage that is too close to the programmed output voltage (too low) may cause dropout operation and a loss of output voltage regulation. Also, an input voltage that is too high above the output may increase power dissipation to an unacceptable level. dc2177acf 2