ISL91211 PMIC has efficiency fit for application processors, GPUs, FPGAs and system power
The highly integrated ISL91211 power management integrated circuit (PMIC) enables 91 per cent efficiency and 40 per cent smaller size, says Intersil. The PMICs are design for smartphones, IoT devices, and other space- or power-constrained systems
The integrated, programmable PMIC delivers 91 per cent efficiency at 1.1V output for application processors, graphic processing units (GPUs) field programmable gate arrays (FPGAs) and high-performance system power, says Intersil. The ISK91211’s low RDS(ON) MOSFETs and programmable PWM frequency allows designers to use fewer low-profile external components, enabling a 50mm² power-supply that is 40 per cent smaller than competing devices, claims Intersil. The ISL91211 triple/quad output PMIC can be designed into smartphones, tablet computers, solid-state drives, networking and wireless Internet of Things (IoT) devices powered by single-cell Lithium-ion (Li-on) batteries, or 2.5 to 5.5V power supplies.
The ISL91211 leverages Intersil’s latest R5 modulation technology to provide what is claimed to be the industry’s fastest single-cycle transient response and highest switching frequency (4.0MHz) during load transients. Quiescent current is only 62-microA, while the ISL91211 is regulating the output voltage. The PMIC’s light load efficiency, regulation accuracy and fast dynamic response contribute to prolong battery life.
The ISL91211 PMIC includes synchronous buck converters capable of multi-phase and single-phase operation while delivering up to 5.0A per phase of continuous output current. The PMIC’s four integrated buck controllers dynamically reconfigure their power stages to address a 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 optimise power efficiency, and provide over-current protection without requiring DCR or resistor sensing circuits at the inductor.
There are two, factory-configurable options available. The ISL91211A has four-phase, three output rails configured as 2+1+1 phase, and the ISL91211B has four-phase, four output rails configured as 1+1+1+1 phase. Both have 5.0A maximum current per phase, up to 20A.
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.
The ISL91211A triple-output PMIC and ISL91211B quad-output PMIC are supplied in 2.511 x 3.610mm, 54-ball WLCSP.
