The Primarion Di-POLTM PX7542 Power IC is a highly
configurable Digital Point-of-Load (POL) Controller with two
loops and four PWM outputs. Designed for use in high current
buck converter topologies, the controller can operate with
either DCR or RDSon current sense configurations. For the
DCR current sense, the output range is from 0.5V to [Vcc –
0.9V] and for the RDSon current sense, the output range is
from 0.5V to 7.2V. In dual-loop mode, the PX7542 supports
two independent outputs with single/dual phase control for
each output. In single-loop mode, the PX7542 can provide a
single output rail with up to four phases. Chip-to-chip current
sharing with up to four phases can be interleaved
synchronously for multiphase operation.
The PX7542 utilizes digital technology to implement all control
functions, providing the ultimate in flexibility and stability. The
PX7542 incorporates an industry standard PMBus? serial
interface for real-time system control. Through the serial
interface, the power supply designer can quickly optimize
designs while monitoring system performance without having
to make any hardware adjustments.
The PX7542 provides superior accuracy through internal
calibration that measures and corrects current sense error
sources upon startup. The controller also has programmable
current sense temperature compensation that allows the
designer to tailor the response for best accuracy over
temperature.