LTM4705 DC/DC µModule® Regulator

ADI's LTM4705 is a complete dual 5 A step-down switching mode μModule regulator in a tiny 6.25 mm x 7.5 mm x 3.22 mm BGA package. Included in the package are the switching controller, power MOSFETs, inductor, and support components. Operating over an input voltage range of 3.1 V to 20 V, the LTM4705 supports an output voltage range of 0.6 V to 5.5 V, set by a single external resistor. Its high-efficiency design delivers dual 5 A continuous output current. Only a few ceramic input and output capacitors are needed.

The LTM4705 supports selectable Burst Mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability. Fault protection features include input overvoltage, output overcurrent, and overtemperature protection.

The demonstration circuit DC3051A features the LTM4705, a high efficiency dual 5 A or single 10 A μModule DC/DC regulator in a compact and low profile 6.25 mm x 7.5 mm x 3.22 mm BGA package. The LTM4705 can take 3.1 V to 20 V input and generate 0.6 V to 5.5 V output (stepdown only). The DC3051A demo board is designed to take 6 V_IN to 20 V_IN to dual 5 A jumper selectable outputs. The board operates by default at a fixed 1 MHz and can be synchronized from 1 MHz to 3 MHz via the MODE/SYNC pin. With its high switching frequency and current mode architecture, a fast-transient response to line and load changes is possible without sacrificing stability. The DC3051A can be used in forced continuous mode or pulse-skipping mode for low noise or in Burst Mode operation for high efficiency at light loads. See the LTM4705 data sheet for more detailed information.

Features

• Fits in a small PCB area with a tiny 6.25 mm x 7.5 mm package
• Configurable dual 5 A or single 10 A supports multiple power rails in a single part
• Wide V_IN and V_OUT range can support both low voltage rails and system bus voltages