Exact device and ordering identity
UCD3138064ARGCR is the 64-contact RGC ordering version of TI’s UCD3138064A digital controller for isolated power supplies. The A variant provides programmable feedback and modulation functions under firmware control, not an integrated high-current buck power stage. Its separate 64-terminal QFN footprint and A-device peripheral resources must be checked before substituting a 40-terminal UCD3138064 part.
Operating and control considerations
At the control architecture level, the device offers two 32 kB program-flash banks for a total of 64 kB, and can manage up to three independent feedback loops. Its up-to-eight DPWM outputs and 250 ps pulse-width resolution are control timing resources. These values do not specify the continuous current delivered by the external MOSFETs, magnetics or gate drivers chosen for a finished power converter.
Package, sourcing and engineering trade-offs
The 2 MHz switching ceiling is a controller capability, not a required fixed-frequency setting. Real-world applicability depends on firmware, sensing and gate-drive interface design and whether the selected QFN pinout exposes the required I/O. Do not transfer UCD3138064 non-A software, pinout assumptions or power-stage ratings onto this exact A-suffix RGC device without verification.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Function | digital controller for isolated power supplies | It controls external power stage; not integrated 64A power converter |
| Program memory | 64kB flash arranged in two 32kB banks | Supports firmware upgrade/dual-bank architecture |
| Feedback loops | up to 3 independent loops | Requires firmware/control programming |
| Dpwm | up to 8 high-resolution DPWM | DPWM output is switching control waveform, not load current |
| Dpwm resolution | 250ps pulse width resolution | Digital PWM timing specification, not converter switching frequency |
| Switch limit | up to 2MHz switching frequency | Architectural maximum configurable, not required operating rate |
| Package | RGC 64-pin QFN | Original PDF 64pin A-package, exact RGC part addendum |
| Catalog package | VQFN-64-EP(9×9) | Match exact TI mechanical drawing before footprint or replacement approval |
For a smaller 40-contact RJA controller in the non-A UCD3138064 family, compare UCD3138064RJAR. This UCD3138064ARGCR uses the A-version 64-contact RGC package, with A-specific communication resources including additional SPI and I2C ports. Different pin count, accessible functions and firmware/peripheral resources mean the two control ICs are not drop-in replacements.
Procurement and datasheet
Request a quotation for UCD3138064ARGCR using the complete orderable number, target quantity and package requirement. Stock, pricing and delivery timing are not guaranteed by this product page. Source-listed alternative candidates, where present, are for engineering evaluation and do not establish drop-in compatibility.
