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Renesas Announces Battery Charger For Mobile Computing Systems

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Renesas Electronics, a supplier of advanced semiconductor
solutions, has introduced the industry's first USB-C buck-boost battery charger
to support both Narrow Voltage Direct Charging (NVDC) and Hybrid Power
Buck-Boost (HPBB) charging for notebooks, ultrabooks, tablets, and power banks
using the reversible USB Type-C connector cable. Through firmware control, the
ISL9241 can switch between NVDC and HPBB modes, providing a low-cost and small
solution size capable of efficiently processing a full range of power levels.
It leverages Renesas' advanced R3 modulation technology for superior
light-load efficiency and ultra-fast transient response to extend battery
run-time. The charger's reconfigurable internal registers allow the use of a
smaller inductor for HPBB mode to achieve higher efficiencies across multiple
power levels.

The ISL9241 delivers charging, system bus regulation, and
protection features using NFETs for highest efficiency and bill of material
(BOM) cost optimization. The charger can operate with only a battery, only an
adapter, or both connected. It takes DC input power from conventional adapters,
travel adapters, and USB Type-C power delivery (PD) ports, and safely charges
battery packs with up to four-cell Li-ion series batteries. In NVDC mode, the
ISL9241 automatically selects the adapter or battery as the source for system
power. NVDC operation also supports turbo mode by turning on the BGATE FET to
limit adapter current at the adapter's current limit set point. NVDC is the
ISL9241's initial startup state before the system controller's firmware changes
the configuration to HPBB. In higher power HPBB mode, the ISL9241 supports
bypass, bypass plus charging, reverse turbo-boost mode, and reverse turbo-boost
mode plus charging.

The ISL9241 provides 5V to 20V reverse buck, boost, or
buck-boost operation to the adapter port (OTG mode). This allows configurations
to support USB-C PD output for fast charging Programmable Power Supply (PPS)
ports. Direct charging the battery can also be enabled by bypassing the ISL9241
in PPS mode. The ISL9241's reconfigurable charging architecture also allows
designers to use the charger for multiport configurations while remaining fully
compliant with the USB PD3.0 standard. Several digital telemetry, fault
monitoring and protection features are provided. In addition, the ISL9241 also
features a supplemental power mode that allows the input bias capacitor to
store energy and release it during high power demand.

“The ISL9241 combo NVDC and HPBB battery charger gives
customers the highest level of flexibility along with optimized system
performance and maximum efficiency,” said Andrew Cowell, Vice President,
Battery & Optical Systems Division, Renesas Electronics Corporation.
“Mobile computing OEMs count on Renesas to consistently deliver power
management innovations that help them differentiate their products with thinner
form factors and longer battery life.”

The ISL9241 can be combined with the ISL95338 buck-boost
voltage regulator, R9A02G011 USB PD controller or R9J02G012 USB PD controller,
and RAJ240045 fuel gauge IC for a complete USB-C PD3.0 and battery charger
solution.

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