Renesas | ISL9237HRZ

The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC) charger. The ISL9237 provides the NVDC charging function, system bus regulation and protection features for tablet, ultra-book and notebook platforms. Intersil’s advanced R3™ Technology is used to provide high light-load efficiency, fast transient response and seamless DCM/CCM transitions.  In charging mode the ISL9237 takes input power from a wide range of DC power sources (conventional AC/DC charger adapters, USB PD ports, travel adapters, etc.) and safely charges battery packs with up to 3-series cell Li-ion batteries.  ISL9237 supports On-the-Go (OTG) function for 2- and 3-cell battery applications. When OTG function is enabled, the ISL9237 operates in the reverse buck mode to provide 5V at the USB port.

Features and Benefits:

Single chip, 3.2V to 23.4Vin without dead zone, NVDC Buck-Boost charger
for 1~3-Cell Li-ion battery with USB OTG reverse buck mode

• Supporting USB-C Ecosystem, capable of Buck mode, Buck-Boost mode and Boost mode
• OTG supports 5Vout (reverse buck) from 2 or 3-Cell battery system
• Single chip reduces total BOM cost by 40%

Intersil R3TM Technology

• Most reliable Core PWM control scheme utilized in ISL9237
• Best CCM/DCM efficiency to improve battery life
• Up to 1MHz switching frequency, auto reduce Fsw when it’s in DCM mode, no audible acoustic noise

Full system protection and programmability

• SMBus/I2C programmable adapter current, charger current limit, system voltage setting
       and trickle charge current limit
• Compliant with Intel PROCHOT# and PSYS against battery drop, adapter over-current,
       batter over-current and overheat 
• Other protection features include Adapter OVP, system OVP, way OCP and OTP.
• Actively controlled inrush current to prevent FET damage

Target applications:

• Power banks
• Handheld scanners & printers
• USB adapters
• Mobile POS