The ISL9238EVAL1Z evaluation board demonstrates the performance of the ISL9238. The step up and step down Narrow Output Voltage DC battery charger provide high light-load efficiency, fast transient response and seamless DCM/CCM transitions.
The number of the Li-ion batteries, the switching frequency and the adapter current limit charging function is programmed with a simple resistor.
Input power of the ISL9238 in charge mode can be supplied from AC-DC charger adapters, USB Power Device ports or travel adapters. It safely charges up to 4 cell Li-ion batteries in a series configuration.
When the USB On-the-Go (OTG) function is enabled, the ISL9238 operates in the Reverse step down mode to provide 5 V output at the USB port.
The ISL9238 can program critical parameters with the serial SMBus/I²C communication. These include adapter current limit, charger current limit, system voltage setting and trickle charging current limit.

Supply Input voltage 4 V to 20 V
End of Charge (EOC) option
System power monitor PSYS output, IMVP-8 compliant
PROCHOT# open-drain output, IMVP-8 compliant
Trickle charging of depleted battery
Optional ASGATE FET control
Turbo mode offers Ideal diode control
Reverse step down, step up and both step up/down operations from battery
Two-level current limit available for adapter
Battery Ship mode option
SMBus and auto-increment I²C compatible

Battery Management, Intersil