Buck-Boost Configurable Battery Charger with SMBus Interface and USB Power Delivery


The ISL9241 is a digitally configurable buck-boost battery charger that can support both Narrow Voltage Direct Charging (NVDC) and Hybrid Power Buck Boost (HPBB/Bypass) charging and switch between the modes using firmware control. Bypass mode is also supported using a controller’s firmware, allowing the adapter to provide power directly to the system. The ISL9241 provides the charging function, system bus regulation, and protection features using only NFETs for tablet, ultrabook, and notebook platforms. The advanced Renesas R3™ technology provides a high, light-load efficient Charging mode. The ISL9241 takes input power from a wide range of DC power sources (conventional AC/DC charger adapters, USB Type-C Power ports, travel adapters, etc.) and safely charges battery packs with up to 4-series cell Li-ion batteries.

The system power can be provided from the adapter, battery, or a combination of both. The charger’s reconfigurable internal registers allow the use of a smaller inductor for the HPBB mode to achieve higher efficiencies across multiple power levels. The ISL9241 can operate with only a battery, only an adapter, or both connected. For Intel IMVP compliant systems, the ISL9241 includes System Power monitor (PSYS) functionality, which provides an analog signal representing total platform power. The PSYS output connects to a wide range of IMVP core regulators to provide an IMVP compliant power domain function. The ISL9241 supports reverse buck, boost, or buck-boost operation to the adapter port (OTG mode) from 2- to 4-cell batteries. This allows configurations to support USB-C Power Delivery (PD) output for Programmable Power Supply (PPS) ports. The ISL9241 serial communication uses SMBus/I2C, which allows programming of many key parameters to deliver a customized solution.


    • Buck-boost NVDC or hybrid power (turbo boost) charger for 2-, 3-, or 4-cell Li-ion batteries using all NFET transistors
    • Input voltage range: 3.9V to 23.4V (no dead zone)
    • System/battery output voltage: 3.9V to 18.304V
    • Bypass mode supported, to connect system to adapter
    • Autonomous charging option (automatic end of charging)
    • Adapter current and battery current monitor (AMON/BMON)
    • PROCHOT# open-drain output, IMVP compliant
    • System power monitor PSYS output, IMVP8/9 compliant
    • Internal 8-bit ADC for monitoring key parameters
    • USB-C PD Fast Role Swap support and PPS support
    • Independent compensation pins for forward and reverse operation (OTG) modes
    • Supports supplemental power (Intel VMIN active protection)
    • Battery Ship mode - IC ultra-low power state
    • Supports JEITA compliance using an NTC
    • 4 x 4 32 Ld TQFN package


 Block Diagram


Production Status
Input Voltage Min (V)
Input Voltage Max (V)
Battery Charge Voltage (V)
3.9 to 18.304
Charging Voltage Accuracy Max (%)
Battery Charge Voltage Adjust (%)
8mV steps
Charge Current Limit Accuracy (%)
Trickle Charge Current Limit Accuracy (%)
64mA, 96mA, 128mA, 160mA, 192mA, 224mA, or 256mA
Automatic Power Source Selection
DC Adapter Detection
R3 modulator
Switching Frequency Typ (kHz)
600 to 1420
Max Duty Cycle (%)
Audible Noise
Thermal Shutdown (°C)
150 °C
Battery Chemistry
Multi-Cell Li+/Polymer
Qualification Level
Input Voltage Range (V)
3.9 to 23.4
Can Sample

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