DEMO MANUAL DC1367A LTM4615EV: Dual DC/DC Step-Down Module Regulator with LDO DESCRIPTION and thermal conditions. The LTM4615 data sheet must be Demonstration circuit 1367A features the LTM 4615EV, a read in conjunction with this manual prior to working on triple output Module regulator consisting of two switch or modifying DC1367A. mode outputs and one LDO output. Each LTM4615 DC/DC converter has a separate input and enable pin. The LTM4615 Design files for this circuit board are available at maximum load current is 4A for each switch mode channel DEMO MANUAL DC1367A QUICK START PROCEDURE Demonstration circuit 1367A is an easy way to evaluate 4. Once the proper output voltage is established, adjust the performance of the LTM4615. Please refer to Figure1 the load within the operating range and observe the for proper measurement equipment setup and follow the output voltage regulation, ripple voltage, efficiency and procedure below: other parameters. To measure input and output ripple, please refer to Figure 2 for proper setup. 1. Place jumpers in the following positions for a typical 1.8V, 1.2V and 1.0V application: 5. VOUT1 can track another supply by connecting TP14, TRACK to the supply rail and setting JP1 to ENABLED. TRACK1 RUN1 RUN2 When R8 equals RSET1, VOUT1 is set up for coincidental DISABLED ON ON tracking. VOUT2 is set up to coincidentally track VOUT1 2. With power off, preset the loads to 0A and V supply as determined by resistors R6 and R7. Please refer to IN to be 5V. Connect the input power supply, load and the circuit schematic and data sheet. meters as shown in Figure 1. 6. VOUT2 is used as the input supply for the 1.5A LDO. 3. Turn on the power at the input. The output voltage Therefore, if the jumper of JP3 (RUN2) is placed at OFF between VO1+ and VO1 should be 1.8V 2%, the position, both channel 2 and 3 will be turned off. voltage between VO2+ and VO2 should be 1.2V 2%, 7. Because DC1367A is designed so VOUT2 tracks VOUT1 and the voltage between VO3(LDO) and GND should be automatically, placing the JP2 (RUN1) to OFF position 1.0V 2%. turns off all three outputs. To disable tracking on VOUT2, please remove R6 and R7 and connect TRACK2 to VIN2. 8. VIN1 and VIN2 are shorted on DC1367A through a 1m resistor, R10. If desired, remove R10 to allow separate LOAD 0A TO V and V power supplies. IN1 IN2 1.5A + A + LOAD LOAD V 0A TO 0A TO 4A 2.5A DC1376 F01 V IN + DC1376 F02 INPUT OR OUTPUT CAPACITOR + V Figure 2. Proper Scope Probe Placement for Measuring Figure 1. Test Setup of DC1367A Input or Output Ripple dc1367af 2 + + A V + A + + A V +