DEMO MANUAL DC1385A LTM4614EV: Dual 4A Step-Down Module Regulator DESCRIPTION Demonstration circuit DC1385A features the LTM 4614EV, coincidentally follow another supply rail. The LTM4614 data the high efficiency, high density power module with dual 4A sheet must be read in conjunction with this demo board switch mode outputs. Derating is necessary for certain V , prior to working on or modifying demo circuit DC1477A. IN V , and thermal conditions. In the default configuration, Design files for this circuit board are available at OUT the two outputs share the same input supply, however each DEMO MANUAL DC1385A QUICK START PROCEDURE Demonstration circuit DC1385A is an easy way to evalu- 5. Channel 1 can track another supply by connecting TP17, ate the performance of the LTM4614EV. Please refer to TRACK to another supply and setting JP1 to ENABLED. Figure 1 for proper measurement equipment setup and Resistors R8 and R9 are set up for coincidental tracking. follow the procedure below: Channel 2 is set up to coincidentally track the output of channel 1 by resistor R6 and R7. Please refer to the 1. Place jumpers in the following positions for a typical circuit schematic and data sheet. 1.8V and 1.2V application: 6. Because DC1385A is assembled in a way that V OUT2 TRACK1 RUN1 RUN2 tracks V automatically, placing the JP2 (RUN1) to OUT1 DISABLED ON ON OFF position turns off both outputs. To disable track- 2. With the power off, connect the input power supply, ing function of V , please remove R6 and R7 and OUT2 load and meters as shown in Figure 1. Preset the loads connect TRACK2 to V . IN2 to 0A and V supply to be less than 5.5V. IN 7. V and V are shorted on DC1385A through a IN1 IN2 3. Turn on the power at the input. The output voltage 1mohm resistor, R10. If desired, remove R10 and dif- + between VO1 and VO1 should be 1.8V 2%, and the ferent supplies can be applied to V and V of this IN1 IN2 + voltage between VO2 and VO2 should be 1.2V 2%. demo circuit. 4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. To measure input and output ripple, please refer to Figure 2 for proper setup. dc1385af 2