DEMO MANUAL DC2007A-B LTM4630EV High Efficiency, PolyPhase 105A Step-Down Power Module Regulator DESCRIPTION TRACK pin. The output voltage is tightly regulated between VO+ and VO- through remote output voltage sensing Demonstration circuit 2007A-B features a PolyPhase which improves output voltage regulation at heavy loads. design using the LTM 4630EV, the high efficiency, high These features and the availability of the LTM4630EV in a density, dual 18A, switch mode step-down power Module compact 16mm 16mm 4.41mm LGA package make regulator. The input voltage is from 4.5V to 15V. The out- it ideal for use in many high density point-of-load regula- put voltage is jumper selectable from 0.9V to 1.8V. The tion applications. The LTM4630 data sheet must be read DC2007A-B can deliver a nominal 105A output current. in conjunction with this demo manual for working on or As explained in the data sheet, output current derating is modifying the demo circuit DC2007A-B. necessary for certain V , V , and thermal conditions. The IN OUT Design files for this circuit board are available at LTM4630 on DC2007A-B always operates in continuous DEMO MANUAL DC2007A-B PERFORMANCE SUMMARY Specifications are at T = 25C A PARAMETER CONDITIONS / NOTES VALUE Input Voltage Range 4.5V ~ 15V Output Voltage V V = 4.5A ~ 15V, I = 0A ~ 105A, JP5: 1.0V 1.0V 1.5% (0.985V ~ 1.015V) OUT IN OUT Maximum Continuous Output Current Derating Is Necessary for Certain V , V and 105A IN OUT Thermal Conditions, See Data Sheet for Details. Default Operating Frequency 400kHz Resistor Programmable Frequency Range 400kHz to 780kHz External Clock Sync. Frequency Range 400kHz to 780kHz Efficiency V = 12V, V = 1.0V, I = 105A, f = 400kHz 83.8% See Figure 3 IN OUT OUT SW Load Transient V = 12V, V = 1.0V, I = 0A ~ 26.25A <100mV, See Figure 4 IN OUT STEP Output Voltage Ripple V = 12V, V = 1.0V, I = 105A <4mV, See Figure 5 IN OUT OUT QUICK START PROCEDURE Demonstration circuit DC2007A-B is easy to set up to 5. (Optional) For an optional load transient test, apply an evaluate the performance of PolyPhase operation of the adjustable pulse signal between IOSTEP CLK and the LTM4630EV. Due to the high input/output current, user GND test point. Pulse amplitude (3V ~ 3.5V) sets the should select the proper input supply/load/cable which load step current amplitude. The output transient current can sustain the full load operation. Its recommended to can be monitored at the BNC connector, J8 (5mV/A). pull load current from J2 and J4. The load current pulled The pulse signal should be very small duty cycle (<10%) from J5 and J6 shouldnt exceed 18A. Please refer to to limit the thermal stress on the transient load circuit. Figure 2 for proper measurement setup and follow the 6. (Optional) The LTM4630 can be synchronized to an procedure below: external clock signal. Place the JP1 jumper on EXT 1. Place jumpers in the following positions for a typical and apply a clock signal (0V ~ 5V, square wave) on the 1.0V application: EXT CLK test point. OUT 7. (Optional) The outputs of the LTM4630 can track another JP1 JP2 JP4 ~ JP8 supply. The output voltage tracks the voltage on TRACK CLK RUN VOUT SELECT when a valid signal is applied on the test point. INT OFF ON JP5/1.0V 8. (Optional) The DC2007A-B can be configured to a dual 2. With power off, connect the input power supply, load output configuration with VO at 87.5A load current and and meters as shown in Figure 2. Preset the load to 0A VO2 at 18A load current. Stuff a 0 resistor on R61 and V supply to 12V. IN and a 0.1F on C14. Remove R22, R23, R24, R26, R27, R28, R32, R33, R35. Output voltage VO2 is set by R37 3. Turn on the power supply at the input. Place JP2 to the based on the equation VO2 = 0.6V(1 + 60.4K/R37). ON position. The output voltage between VO+ and VO- should be 1.0V 1.5% (0.985V ~ 1.015V). 4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. Output voltage ripple should be measured at J7 with BNC cables. 50 termination should be set on the oscilloscope or BNC cables. dc2007a bf 2