DC1889A Analog Devices

DEMO MANUAL DC1889A LTM4624EY 4A Step-Down Module Regulator Description Demonstration circuit 1889A features the LTM 4624EY voltage tracking is available through the TRACK/SS pin for Module regulator, a tiny high performance high supply rail sequencing. The LTM4624 data sheet must be efficiency step-down regulator. The LTM4624EY has an read in conjunction with this demo manual prior to working operating input voltage range of 4V to 14V and is able to on or modifying demo circuit 1889A. provide an output current of up to 4A. The output voltage Design files for this circuit board are available at is programmable from 0.6V to 5.5V. The LTM4624EY is DEMO MANUAL DC1889A Quick s p D Demonstration circuit 1889A is an easy way to evaluate the 5. Once the proper output voltage is established, adjust performance of the LTM4624EY. Please refer to Figure 1 the load current within the 0A to 4A range and observe for test setup connections and follow the procedure below. the load regulation, efficiency, and other parameters. Output voltage ripple should be measured at J6 with a 1. With power off, place the jumpers in the follow-ing BNC cable terminated into 50 and an oscilloscope. positions for a typical 1.8Vout application: 6. To observe increased light load efficiency place the JP7 JP6 JP4 MODE pin jumper (JP6) in the DCM position while input RUN MODE VOUT Select power is removed. ON CCM 1.8V 7. For optional load transient testing apply an adjustable 2. Before connecting input supply, load and meters, pre- positive pulse signal between IOSTEP CLK and GND set the input voltage supply to be between 4V to 14V. pins. The pulse amplitude sets the load step current Pre-set the load current to 0A. amplitude. The pulse width should be short (<1ms) and pulse duty cycle should be low (<15%) to limit the 3. With power off, connect the load, input voltage supply thermal stress on the load transient circuit. The load and meters as shown in Figure 1. step current can be monitored with a BNC connected 4. Turn on input power supply. The output voltage meter to J5 (50mV/A). should display the selected output voltage 2%. + LOAD 0A TO 4A V IN Figure 1. Test Setup dc1889af 2 V + + + A A + V + ure roce tart