DEMO MANUAL DC1498A LTM4620EV High Efficiency, Dual 13A Step-Down Power Module Regulator Description DC1498A features the LTM 4620EV, the high efficiency, how its output ramps up and down through the TRACK/SS high density, dual 13A, switch mode step-down power pin. The output can be set up to either coincidentally or module regulator. The input voltage is from 4.5V to 16V. ratiometrically track with another supplys output. Remote The output voltage is programmable from 0.6V to 2.5V. output voltage sensing is available for improved output DC1498A can deliver nominal 12A output current and voltage regulation at the load point. These features and up to 13A maximum in each channel. As explained in the availability of the LTM4620EV in a compact 15mm the data sheet, output current derating is necessary for 15mm 4.41mm LGA package make it ideal for use in certain V , V , and thermal conditions. The board many high-density point-of-load regulation applications. IN OUT operates in continuous conduction mode in heavy load The LTM4620 data sheet must be read in conjunction conditions. For high efficiency at low load currents, the with this demo manual prior to working on or modifying MODE jumper (JP1) selects pulse-skipping mode for noise DC1498A. sensitive applications or Burst-Mode operation in less Design files for this circuit board are available at noise sensitive applications. Two outputs can be connected DEMO MANUAL DC1498A p erformance s (T = 25C) A PARAMETER CONDITIONS VALUE Input Voltage Range 4.5V to 16V Output Voltage V V = 4.5V to 16V, I = 0A to 12A, JP1: CCM 1.5V 1.5% (1.4775V to 1.5225V) OUT1 IN OUT1 Output Voltage V V = 4.5V to 16V, I = 0A to 12A, JP1: CCM 1.2V 1.5% (1.182V to 1.218V) OUT2 IN OUT2 Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain V , V and Thermal 13A (Per Channel) IN OUT Conditions. See data sheet for detail. Default Operating Frequency 600kHz Resistor Programmable Frequency Range 250kHz to 780kHz External Clock Synchronous Frequency Range 400kHz to 780kHz Efficiency of Channel 1 V = 5V, V = 1.5V, I = 13A, f = 600kHz 87.7% See Figure 2 IN OUT1 OUT1 SW Efficiency of Channel 2 V = 5V, V = 1.2V, I = 13A, f = 600kHz 85.1% See Figure 3 IN OUT2 OUT2 SW Load Transient of Channel 1 V = 12V, V = 1.5V, I = 0A to 6A See Figure 4 IN OUT1 SETP Load Transient of Channel 2 V = 12V, V = 1.2V, I = 0A to 6A See Figure 5 IN OUT2 SETP Quick s tart p D LTM4620 Demo Cards for Up to 100A Point-of-Load Regulation NUMBER OF LTM4620 MODULE MAXIMUM OUTPUT CURRENT (A) NUMBER OF OUTPUT VOLTAGES REGULATORS ON THE BOARD DEMO CARD NUMBER 13, 13 2 1 DC1498A 50 1 2 DC1780A-A 75 1 3 DC1780A-B 100 1 4 DC1780A-C DC1498A is easy to set up to evaluate the performance 4. Once the proper output voltage is established, adjust the of the LTM4620EV. Please refer to Figure 1 for proper load within the operating range and observe the output measurement setup and follow the procedure below: voltage regulation, output voltage ripple, efficiency and other parameters. Output ripple should be measured 1. Place jumpers in the following positions for a typical at J1 and J2 with BNC cables. 50 termination should application: be set on the oscilloscope or BNC cables. JP1 JP2 JP3 JP4 JP5 JP6 5. (Optional) For optional load transient test, apply an MODE RUN1 RUN2 TRACK1 TRACK2 CLKOUT adjustable pulse signal between IOSTEP CLK and GND SEL. SEL. PHASE CCM ON ON Soft-Start Soft-Start 90 test point. Pulse amplitude (3V to 3.5V) sets the load step current amplitude. The output transient current can be monitored at the BNC connector J3 (15mV/A). 2. With power off, connect the input power supply, load The pulse signal should have very small duty cycle and meters as shown in Figure 1. Preset the load to 0A (<10%) to limit the thermal stress on the transient and V supply to 12V. IN load circuit. Switch the jumper resistors R34 or R35 3. Turn on the power supply at the input. The output volt- (on the backside of boards) to apply load transient on age in channel 1 should be 1.5V 1.5% (1.4775V to channel 1 or channel 2 correspondingly. 1.525V) and the output voltage in channel 2 should be 1.2V 1.5% (1.182V to 1.218V). dc1498afa 2 ure roce ummary