Thin regulators are configurable in output options
The quad output step-down uModule, the LTM4643, can be configured as a single output (12A), dual (two 6A or 9.0 and 3A), or quad (3A each) regulator in a 9.0 x 15 x 1.82mm ultrathin LGA package.
System designers can therefore rely on one simple and compact µModule regulator for a variety of voltage and load current requirements in FPGA, GPU, ASIC and processor-based applications, says the company. The 1.82mm high, thin package allows the LTM4643 to be mounted on the reverse of the PCB, freeing space on the topside for components such as memory and connectors.
The regulator is suitable for systems with height restrictions, such as back PCB assembly in PCIe applications and where the regulator must fit under a common heatsink or cold plate to cool devices in embedded computing, data storage, medical imaging and industrial systems.
Only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) are required to regulate four independently adjustable outputs between 0.6 to 3.3V. Separate input pins enable powering of the four channels from different or a common supply rail(s) from 4.0 to 20V.
The four channels are switched 90 degree out-of-phase to minimise input ripple at the 1.2MHz default switching frequency or synchronised to an external clock between 850kHz and 1.5MHz. With the addition of an external bias supply above 4V, the LTM4643 can regulate from an input supply voltage as low as 2.375V. Output over-voltage, over-current and over-temperature fault protection are included.
Operating temperature range is -40 to +125 degree C (internal).