LTM4619 Step-Down DC/DC Umodule Regulator System

Linear Technology has introduced the LTM4619, a complete dual step-down DC/DC Umodule regulator system, including inductors and Mosfets in a tiny surface-mount package. The LTM4619 regulates two output voltages ranging from 0.8 to 5V at up to 4A each, from an input supply of 4.5 to 26.5V (28V ABS max). The outputs are regulated with 180 out-of-phase operation to minimise input ripple current, thus requiring fewer input capacitors.

This complete dual DC/DC system includes all the necessary components for two point-of-load regulator circuits: inductors, bypass capacitors, DC/DC controllers, compensation circuitry and power switches. All components are encapsulated and protected within a plastic surface-mount LGA (land grid array) package. Package dimensions are 15 x 15mm with only 2.8mm of thickness, providing a low-profile point-of-load regulator for more efficient air cooling in densely populated circuit boards.

The LTM4619 is a simple single-part dual DC/DC solution in an IC form factor, designed for systems requiring localised multi-rail regulation from input supplies such as 5, 12 or 24V. Applications range from avionics and medical systems to datacom and enterprise equipment. The LTM4619 has guaranteed total DC output error of only +/- 1.5 per cent, which encompasses errors from the reference voltage as well as line and load regulation.

As a current mode device with high switching frequency, the LTM4619 has very fast transient response to line and load changes, while operating with excellent stability with a variety of external output capacitors. The efficiency is nominally 89 per cent for 12V IN to 3.3V OUT at 4A. The device supports output-voltage tracking and safety features, including overvoltage and overcurrent protection. The LTM4619 is guaranteed for operation from -40C to +125C (internal temperature). The device is RoHS compliant with the ability to be soldered with Pb-free (lead-free) and Pb-based solder during board assembly. The LTM4619 is now available, priced at USD16.75 (GBP11) each in 1,000-piece quantities.

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