DEMO MANUAL DC1989B-C LTM4676AEY Dual 13A or Single 26A Module Regulator with Digital Power System Management 4 LTM4676A, 100A DESCRIPTION Demonstration circuit 1989B-C is a high efficiency, high the board. LTpowerPlay allows the user to reconfigure the density, Module regulator with 4.5V to 17V input range. part on the fly and store the configuration in EEPROM, view The output voltage is adjustable from 0.5V to 4V, and it can telemetry of voltage, current, temperature and fault status supply 100A maximum load current. The demo board has GUI Download four LTM 4676A Module regulators. The LTM4676A is a dual 13A or single 26A step-down regulator with PMBus The software can be downloaded from: power system management. Please see LTM4676A data DEMO MANUAL DC1989B-C PERFORMANCE SUMMARY Specifications are at T = 25C A PARAMETER CONDITION VALUE Input Voltage Range 4.5V to 17V Output Voltage, V V = 4.5V to 17V, I = 0A to 100A 0.5V to 4V, Default: 1V OUT0 IN OUT0 Maximum Output Current, I V = 4.5V to 17V, V = 0.5V to 4V 100A OUT0 IN OUT Typical Efficiency V = 12V, V = 1V, I = 100A 80.4% IN OUT OUT Default Switching Frequency 350kHz QUICK START PROCEDURE Demonstration circuit 1989B-C is easy to set up to evaluate 6. Connect the dongle and control the output voltages the performance of the LTM4676AEY. Refer to Figure 2 from the GUI. See LTpowerPlay GUI for the LTM4676A for the proper measurement equipment setup and follow Quick Start Guide for details. the procedure below. Note: When measuring the output or input voltage ripple, 1. With power off, connect the input power supply to V do not use the long ground lead on the oscilloscope probe. IN (4.5V to 17V) and GND (input return). See Figure 3 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and () terminals 2. Connect the 1V output load between V and GND OUT0 of an output capacitor. The probes ground ring needs to (Initial load: no load). touch the () lead and the probe tip needs to touch the 3. Connect the DVMs to the input and outputs. Set default (+) lead. switch position: SW1: ON SW2: ON. Connecting a PC to DC1989B-C 4. Turn on the input power supply and check for the proper output voltages. V should be 1V 1%. You can use a PC to reconfigure the power management OUT0 features of the LTM4676A such as: nominal V , margin OUT 5. Once the proper output voltages are established, ad- set points, OV/UV limits, temperature fault limits, sequenc- just the loads within the operating range and observe ing parameters, the fault log, fault responses, GPIOs and the output voltage regulation, ripple voltage and other other functionality. The DC1613A dongle may be plugged parameters. when V is present. IN Table 1. LTM4676/LTM4676A Demo Cards for Up to 130A Point-of-Load Regulation NUMBER OF LTM4676/LTM4676A MODULE MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUT VOLTAGES REGULATORS ON THE BOARD DEMO BOARD NUMBER 13A, 13A 2 1 LTM4676 DC1811A/DC1811B-A 13A, 13A 2 1 LTM4676A DC1811B-B 26A 1 1 LTM4676 DC2087A 50A 1 2 LTM4676A DC1989B-A 75A 1 3 LTM4676A DC1989B-B 100A 1 4 LTM4676A DC1989B-C 100A 1 1 LTM4676 (+ 3 LTM4620A) DC2106A-A 130A 1 1 LTM4676 (+ 3 LTM4630) DC2106A-B 100A 1 1 LTM4676A (+ 3 LTM4620A) DC2106B-A 130A 1 1 LTM4676A (+ 3 LTM4630) DC2106B-B dc1989bcf 2