The ISL9238 and ISL9238A are buck-boost Narrow Output
Voltage DC (NVDC) chargers. The ISL9238 and ISL9238A
provide the NVDC charging function, system bus regulation
and protection features for tablet, ultrabook, notebook, power
bank and any USB-C interface platform. Intersil’s advanced
R3™ Technology is used to provide high light-load efficiency
and fast transient response.
In Charging mode the ISL9238 and ISL9238A 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 4-series cell Li-ion batteries.
As a NVDC topology charger, it also regulates the system output to
a narrow DC range for stable system bus voltage. The system
power can be provided from the adapter, battery or a combination
of both. The ISL9238 and ISL9238A can operate with only a
battery, only an adapter or both connected. For Intel IMVP8
compliant systems the ISL9238 and ISL9238A includes PSYS
(System power monitor) functionality, which provides an analog
signal representing total platform power. The PSYS output will
connect to a wide range of Intersil IMVP8 core regulators to
provide an IMVP8 compliant power domain function.
The ISL9238 and ISL9238A support reverse buck, boost, or
buck-boost operation to input port from 2- to 4-cell batteries.
The ISL9238 and ISL9238A have serial communication via
SMBus/I2C that allows programming of many critical
parameters to deliver a customized solution.
The ISL9238A is exactly same as ISL9238, but it has different
SMBus addresses for customers who use two battery chargers
in one system.

Features
• Buck-boost NVDC charger for 1-, 2-, 3-, or 4-cell Li-ion batteries
• Input voltage range 3.2V to 23.4V (no dead zone)
• System output voltage 2.4V to 18.304V
• Autonomous charging option (automatic end of charging)
• System power monitor PSYS output, IMVP compliant
• Up to 1MHz switching frequency
• Adapter current and battery current monitor (AMON/BMON)
• PROCHOT# open-drain output, IMVP compliant
• Allows trickle charging of depleted battery
• Ideal diode control in Turbo mode
• Reverse buck, boost and buck-boost operation from battery
• Two-level adapter current limit available
• Battery Ship mode option
• SMBus and auto-increment I2C compatible
• Package 4x4 32 Ld TQFN

Applications
• 1 to 4-cell tablet, ultrabook, notebook, power bank, and any
USB-C interface portable device requiring batteries