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 the firmware of the controller, which allows the adapter to provide power directly to the system. The ISL9241 provides charging functionality, 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 (such as conventional AC/DC charger adapters, USB Type-C Power ports, and travel adapters) 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 reconfigurable internal registers of the charger 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
  • 4mm x 4mm 32 Ld TQFN package


  • 2- to 4-cell tablets
  • Notebooks
  • Power banks
  • Any USB-C interface portable device requiring batteries


Title language Type Format File Size Date
star ISL9241 Short-Form Datasheet Datasheet - Short-form PDF 159 KB
ISL9241 Operation Modes Application Note Application Note PDF 466 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
ISL9241 Datasheet Datasheet PDF 5.41 MB
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 326 KB
PCN21028 - Alternate test facility of the listed ISL9241* products Product Change Notice PDF 139 KB
USB Power Delivery Changes the Game 日本語, 简体中文 White Paper PDF 617 KB
새로운 USB-C COMBO 벅-부스트 배터리 충전기를 사용하여 모바일 컴퓨팅 시스템 성능 최적화하기 White Paper PDF 709 KB
Optimizing Mobile Computing System Performance with a New USB-C Combo Buck-Boost Battery Charger 日本語, 简体中文 White Paper PDF 555 KB


Title language Type Format File Size Date
ISL9241 Software Library ZIP 174.71 MB

memoryBoards & Kits

Part Number Title Type Company
ISL9241EVAL1Z USB-C Buck-Boost Charger Evaluation Board Evaluation Renesas