Automatically-compensated digital PoL controller matches analogue loop performance

March 30, 2015 // By Graham Prophet
Maxim Integrated has posted details of the MAX15301AA02, an efficient digital point-of-load (PoL) controller with advanced power management and telemetry (PMBus) features. It is, maxim satates, the only digital power IC to meet transient and light-load efficiency performance metrics set by analogue controllers.

Unlike PID-based digital power regulators, Maxim continues, the MAX15301AA02 uses the company’s InTune automatically compensated, state-space control algorithm. The InTune control law is valid for both the small- and large-signal response and accounts for duty-cycle saturation effects. These capabilities result in fast loop transient response and reduce the number of output capacitors compared to digital controllers.

The MAX15301AA02 includes multiple features to optimise efficiency. An internal switch BabyBuck regulator generates the gate drive and the internal bias supplies for the controller with low power loss. An advanced, high-efficiency MOSFET gate driver has adjustable non-overlap timing and load-variable gate-drive voltage to minimise switching losses over the full range of voltage, current, and temperature.

The IC has an on-board PMBus-compliant serial bus interface for communication with a supervisory controller for monitoring and fault management. A full suite of power management features eliminates the need for complicated and expensive sequencing and monitoring ICs. Basic DC-DC conversion operation can be set up via pin strapping and does not require user configuration firmware. This allows for rapid development of the power-supply subsystem before board-level systems engineering is completed. Maxim provides support hardware and software for configuring the IC.

MAX15301AA02 is available in a 32-lead, 5 x 5 mm TQFN package and operates over the -40°C to +85°C temperature range.