DEMO MANUAL DC2269A-A LTM4676EY Dual Step-Down Module Regulator with PMBus Power System Management Description 2 Demonstration circuit 2269A-A is a dual-output, high ef- LTCs I C/SMBus/PMBus dongle DC2086A together with ficiency, high density, Module supply on a small 1.5 1.2 DC1613A to connect to the board. LTpowerPlay allows PCB board with 4.5V to 26.5V input range. Each output the user to reconfigure the part on the fly and store the can supply 13A maximum load current. The demo board configuration in EEPROM, view telemetry of voltage, cur- has a LTM 4676 Module regulator, which is a dual 13A rent, temperature and fault status. or single 26A step-down regulator with PMBus power GUI Download system management. The DC2269A can be easily inserted to an edge connector for testing and debugging. It has an The software can be downloaded from: optional input filter inductor (L1) to further reduce input DEMO MANUAL DC2269A-A Quick s p D Table 1. LTM4676 Demo Cards for Up to 100A Point-of-Load Regulation NUMBER OF OUTPUT NUMBER OF LTM4676 MODULE MAXIMUM OUTPUT CURRENT VOLTAGES REGULATORS ON THE BOARD DEMO BOARD NUMBER 13A, 13A 2 1 DC1811A 13A, 13A 2 1 DC2269A-A 26A 1 1 DC2087A 50A 1 2 DC1989A-A 75A 1 3 DC1989A-B 100A 1 4 DC1989A-C 100A 1 1 + (3 LTM4620A) DC2106A-A 130A 1 1 + (3 LTM4630) DC2106A-B DC2269A-A is easy to set up to evaluate the performance Note: When measuring the output or input voltage ripple, of the LTM4676EY. It can be easily inserted to an edge do not use the long ground lead on the oscilloscope probe. connector (SAMTEC MEC2-20-01-L-DV--TR) for testing See Figure 3 for the proper scope probe technique. Short, and debugging. Refer to Figure 2 for the proper measure- stiff leads need to be soldered to the (+) and () terminals ment equipment setup and follow the procedure below. of an output capacitor. The probes ground ring needs to touch the () lead and the probe tip needs to touch the 1. With power off, connect the input power supply to V IN (+) lead. (4.5V-26.5V) and GND (input return). 2. Connect the 1.0V output load between V and GND Connecting a PC to DC2269A-A OUT (Initial load: no load). You can use a PC to reconfigure the power management 3. Connect the 1.8V output load between V and GND features of the LTM4676 such as: nominal V , margin OUT OUT (Initial load: no load). set points, OV/UV limits, temperature fault limits, sequenc- ing parameters, the fault log, fault responses, GPIOs and 4. Connect the DVMs to the input and outputs. other functionality. The DC2086A dongle may be plugged 5. Turn on the input power supply and check for the proper when V is present. IN output voltages. V should be 1.0V 1%, and V OUT0 OUT1 should be 1.8 1%. 6. Once the proper output voltages are established, ad- just the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters. 7. Connect the dongle and control the output volt-ages from the GUI. See LTpowerPlay GUI for the LTM4676 Quick Start Guide for details. dc2269aaf 2 ure roce tart