Compact PMIC targets application processors, GPUs and FPGAs

May 16, 2017 // By Julien Happich
Intersil's highly integrated programmable power management IC (PMIC) ISL91211 delivers 91% efficiency at 1.1V output voltage for application processors, GPUs, FPGAs and high-performance system power.

The new PMIC’s low RDS(on) MOSFETs and programmable PWM frequency allows designers to use fewer low-profile external components, enabling a 50mm 2 power-supply that is 40% smaller than competing solutions. Operating with an input voltage range of 2.5 to 5.5V, the ISL91211 triple/quad output PMIC leverages Intersil’s latest R5 modulation technology to provide the industry’s fastest single-cycle transient response and highest switching frequency (4MHz) during load transients. Quiescent current is only 62μA while the ISL91211 is regulating the output voltage. The ISL91211 PMIC includes highly efficient synchronous buck converters capable of multiphase and single-phase operation while delivering up to 5A per phase of continuous output current.

The PMIC’s four integrated buck controllers dynamically reconfigure their power stages to address a wide range of applications with high efficiency and high output power. Precise current sensing allows the ISL91211 to automatically and smoothly add or drop phases to optimize power efficiency, and provide overcurrent protection without requiring DCR or resistor sensing circuits at the inductor. The IC comes in two factory configurable options: ISL91211A four-phase, three output rails configured as 2+1+1 phase and ISL91211B four-phase, four output rails configured as 1+1+1+1 phase. The ISL91211A triple-output PMIC and ISL91211B quad-output PMIC can be combined with Intersil ISL91127 high efficiency buck-boost regulators to provide application processor and subsystem peripheral rails for battery-operated products. Both chips are supplied in 2.511mm x 3.610mm, 54-ball WLCSP packages.

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