IC pair regulates, charges, in Skylake portable compute products

September 29, 2015 // By Graham Prophet
Intended primarily for “2-in-1s”, ultrabooks and tablet computers hosting Intel “Skylake”-generation CPUs, Intersil’s ISL95852 PMIC reduces board space by 50%, while its companion ISL95521 battery charger extends battery run-time.

The ISL95852 highly integrated power management IC (PMIC) and the ISL95521 battery charger both meet Intel‘s IMVP8 specifications to support its new “Skylake” 6th Gen Intel Core processors. The ISL95852 and ISL95521 use Intersil’s R3 modulation technology, which delivers light load efficiency, regulation accuracy and fast dynamic response, resulting in better system power management and longer battery life.

The ISL95852 is the most integrated Vcore PMIC for IMVP8 platforms. Its 4 x 4mm size and high switching frequency enable the use of small external inductors and capacitors to reduce board space by 50% compared to discrete solutions. The ISL95852 integrates control, MOSFET drivers, power MOSFETs and fault monitoring and protection for three synchronous buck switching regulators. These high-efficiency voltage regulators convert system voltage from a battery or AC adapter into three voltage rails required for the core processor, graphics processor and system agent. The ISL95852’s programmable switching frequency is double that of alternatives and is adjustable up to 1.3 MHz during load transients.

The ISL95521 is claimed as the first Hybrid Power Boost (HPB) and Narrow VDC (NVDC) combination battery charger. Its charge current accuracy of 1.2% is 4x higher than alternatives, and extends battery run-time while enabling faster system test and calibration for improved manufacturing yields. The ISL95521 combo battery charger is pin-configurable for HPB or NVDC mode, eliminating the need for circuit redesigns. Both configurations support 2-cell to 4-cell Li-ion batteries as well as system turbo-boost-mode, which helps the battery and AC adapter work together to supply the system load when it exceeds the adapter’s capability. The HPB charger configuration reverse boosts battery energy to the system bus in turbo mode, while the NVDC charger quickly turns on the battery BGATE to help the adapter deliver system power.

Intersil’s total IMVP8-compliant power management solution, which also includes the ISL95908 peripheral PMIC, powers up the CPU/GPU, battery pack, and subsystem peripherals: flash memory, USB, HDMI, audio, sensors, camera module