Active production — VR12.5 controller for Intel CPU core rails
The TPS53661RSBT is an active-production single-output voltage regulator controller from TI's D-CAP+™ family, purpose-built for Intel VR12 and VR12.5 CPU core power delivery.
Package and thermal — 40-WFQFN with exposed pad
Housed in a 40-WFQFN with exposed pad, the 5x5 mm WQFN package (supplier device package 40-WQFN) requires a thermal land on the PCB to pull heat from the die into the board plane.
Single-output architecture — one rail per device
With one output per IC, a multi-rail VR12.5 design (VCC, VCCGT, VCCSA) requires one TPS53661RSBT per rail, each with its own inductor and output capacitor network. The controller integrates the D-CAP+™ modulation for fast transient response without external compensation — the loop stability is set by the output filter components, not by an external RC network.