Intersil - Compact multiphase PWM regulators deliver optimal voltage regulation
Published Oct 1 2009 [Printer friendly version] [Email article to a friend] [More Semiconductor articles]
Intersil has introduced compact multiphase PWM regulators that comply with
the Intel Mobile Voltage Positioning (IMVP-6.5TM) specification. The
ISL62882 and ISL62883 reduce total component cost and implementation
footprint for a wide range of Intel-based mobile handsets, notebooks,
network systems and embedded designs, including the new Capella platform
based on the Ibex Peak-M chipset.
Each regulator supports various CPUs using programmable 3-phase, 2-phase or
1-phase operation. Configurable overshoot reduction capabilities provide
minimal Vout overshoot, which pre-empts voltage misreadings and the
potential for product underperformance or failure. Both devices feature
phase dropping, diode emulation, adaptive body diode conduction time
reduction to optimize light load EFFICIENCY and FB2 (full buffering) to
optimize transient response and Z(f) in 1-phase mode. In addition, the
ISL62882 provides a split LGATE function that further improves efficiency.
To reduce total output voltage ripple, the CONVERTERs apply interleaved
phases. Each phase carries part of the load current, which optimizes system
performance, efficiency and thermal management. The PWM modulator is based
on Intersil's Robust Ripple Regulator (R3) technology(TM), which commands
variable SWITCHing frequency during load transients, achieving faster
transient response than traditional modulators. With the same modulator, the
switching frequency is reduced at light load, increasing the regulator
efficiency.
The ISL62882/3 are available in compact 40-lead QFN packages, says the
company.
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