DEMO MANUAL DC2164A-C LTM4630EY-1 High Efficiency, PolyPhase 140A Step-Down Power Module Regulator Description + Demonstration Circuit 2164A-C features a PolyPhase is tightly regulated between V and V through remote O O design using the LTM 4630EY-1 (A-grade), the high ef- output voltage sensing which improves output voltage ficiency, high density, dual 18A, switch mode step-down regulation at heavy loads. The LTM4630-1A has 0.8% power module regulator. The input voltage is from 4.5V total DC errors. These features and the availability of the to 15V. The output voltage is jumper selectable from 0.9V LTM4630EY-1 in a compact 16mm 16mm 5.01mm to 1.8V. DC2164A-C can deliver nominal 140A output BGA package make it ideal for use in many high-density current. As explained in the data sheet, output current point-of-load regulation applications. The LTM4630-1 data derating is necessary for certain V , V , and thermal sheet must be read in conjunction with this demo manual IN OUT conditions. The LTM4630-1A on DC2164A-C always for working on or modifying the demo circuit DC2164A-C. operate in continuous conduction mode. The switching Design files for this circuit board are available at frequency can be programmed through a resistor or can DEMO MANUAL DC2164A-C p s Specifications are at T = 25C A PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 4.5 15 V Output Voltage V V = 4.5 ~ 15V, I = 0A ~ 140A, JP5: 1V 1 0.8% V OUT IN OUT (0.992 ~ 1.008) Maximum Continuous Output Current Derating Is Necessary for Certain V , V and Thermal 140 A IN OUT Conditions, See Data Sheet for Detail Default Operating Frequency 400 kHz Resistor Programmable Frequency Range 400 780 kHz External Clock Sync. Frequency Range 400 780 kHz Efficiency V = 12V, V = 1V, I = 140A, f = 400kHz 84.4 % IN OUT OUT SW (See Figure 3) Load Transient V = 12V, V = 1V, I = 0A ~ 35A <49.4 mV IN OUT STEP (See Figure 4) Quick s p D Demonstration circuit 2164A-C is easy to set up to and other parameters. Output voltage ripple should evaluate the performance of PolyPhase operation of the be measured at J7 with BNC cables. 50 termination LTM4630EY-1. Due to the high input/output current, user should be set on the oscilloscope or BNC cables. should select the proper input supply/load/cable which 5. (Optional) For optional load transient test, apply an can sustain the full load operation. Its recommended to adjustable pulse signal between IOSTEP CLK and GND pull load current from J2 and J4. The load current pulled test point. Pulse amplitude (3V ~ 3.5V) sets the load from J5 and J6 shouldnt exceed 18A. Please refer to step current amplitude. The output transient current can Figure 2 for proper measurement setup and follow the be monitored at the BNC connector J8 (5mV/A). The procedure below: pulse signal should be very small duty cycle (<10%) 1. Place jumpers in the following positions for a typical to limit the thermal stress on the transient load circuit. 1V application: OUT 6. (Optional) LTM4630-1 can be synchronized to an external clock signal. Place the JP1 jumper on EXT JP1 JP2 JP4 ~ JP8 and apply a clock signal (0V ~ 5V, square wave) on CLK RUN VOUT SELECT the EXT CLK test point. INT OFF ON JP5/1.0V 7. (Optional) The outputs of LTM4630-1 can track another 2. With power off, connect the input power supply, load supply. The output voltage tracks the voltage on TRACK and meters as shown in Figure 2. Preset the load to 0A when a valid signal is applied on the test point. and V supply to 12V. IN 8. (Optional) DC2164A-C can be configured to a dual 3. Turn on the power supply at the input. Place JP2 to outputs configuration with V at 122A load current O + ON position. The output voltage between V and V O O and V at 18A load current. Stuff 0 resistor on R61 O2 should be 1V 0.8% (0.992V ~ 1.008V). and 0.1F on C14. Remove R22, R23, R24, R26, R27, 4. Once the proper output voltage is established, adjust the R28, R32, R33, R35. Output voltage V is set by R37 O2 load within the operating range and observe the output based on the equation V = 0.6V (1 + 60.4k/R37). O2 voltage regulation, output voltage ripple, efficiency dc2164acfa 2 ure roce tart ummary erformance