Micro-module regulator delivers 20A with 1.5% voltage accuracy

May 09, 2013 // By Graham Prophet
Linear Technology's LTM4637 is a 20A DC/DC step-down µModule (micromodule) regulator with onboard precision differential remote sense amplifier. This enables automatic correction of voltage errors caused by droop across PCB traces, which is valuable for powering loads such as FPGAs requiring high currents at low voltages.

Total output DC voltage accuracy is guaranteed at +/-1.5% from -40°C to 125°C. The LTM4637 includes the inductor, MOSFETs, DC/DC controller and compensation circuitry. It is housed in a low height (profile) 4.32mm LGA package with a 15mm x 15mm footprint. With a VIN range of 4.5V to 20V, the device’s operating efficiency is optimised for 5V and 12V input systems (88%, at 12 VIN and 1.8 VOUT at 20A). The output voltage can be set with one resistor, from 0.6V to 5.5V. Four devices in parallel can deliver 80A of load current. Applications include industrial and medical equipment, and networking and telecom systems. A main feature of the LTM4637 is its drop-in and pin compatibility with the LTM4627 15A output µModule regulator, allowing system upgrades on a common footprint.

The LTM4637 features protection functions for overcurrent and overvoltage conditions. The internal temperature of the device can be monitored via an internal temperature sensing diode. The LTM4637 is rated for operation from -40°C to 125°C. The 1000-piece price is $22.10 each.

Linear Technology, www.linear.com/product/LTM4637