Overview
Description
The ISL9238 is a buck-boost Narrow Output Voltage DC (NVDC) charger. The ISL9238 provides the NVDC charging, system bus regulation and protection features for tablet, Ultrabook, notebook, power bank, and any USB-C interface platform. The advanced Renesas R3™ Technology provides high light-load efficiency and fast transient response. In Charging mode, the ISL9238 takes input power from a wide range of DC power sources (such as conventional AC/DC charger adapters, USB PD ports, and travel adapters) 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 can operate with only a battery, only an adapter, or both connected. For Intel IMVP8 compliant systems the ISL9238 includes System Power monitor (PSYS) functionality, which provides an analog signal representing total platform power. The PSYS output connects to a wide range of IMVP8 core regulators to provide an IMVP8 compliant power domain function. The ISL9238 supports reverse buck, boost, or buck-boost operation to input port from 2- to 4-cell batteries. The ISL9238 has serial communication using SMBus/I2C that allows programming of many critical parameters to deliver a customized solution.
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 a 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
- 4mm x 4mm 32 Ld TQFN package
Comparison
Applications
Design & Development
Software & Tools
Boards & Kits
Evaluation
ISL9238EVAL1Z
Active
Buck-Boost Narrow VDC Battery Charger with SMBus Interface and USB OTG Evaluation Board
The ISL9238EVAL1Z evaluation board is designed to demonstrate the performance of the ISL9238 buck-boost Narrow Output Voltage DC (NVDC) charger. The default value numbers of the battery in series, the switching frequency and the adapter current limit charging function can be programmed by the...
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Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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Get quick technical support online from Renesas Engineering Community technical staff.
Support Communities
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Please provide link to PDC-IMGGEN to compile ROM file for R9A02G011
I'd like to use the R9A02G011 (USB Power Delivery Controller) and ISL9238C (NVDC Buck-Boost battery charger) in my next project. To configure chip as I understand i need to use PDC-IMGGEN, where to find it? I'd like to use the R9A02G011 and ISL9238C in my next ...
Oct 16, 2024 -
If someone help to provide the ISL9237 storage time?
Our company have a batch of ISL9237. Their data code is 2205 and I want to confirm if it still can be used? And they still unopened. Thanks!
Mar 20, 2025
FAQs
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How does the Autonomous Charging and End-of-Charge operate on the ISL9238?
Question: How does the Autonomous Charging and End-of-Charge operate? Answer: Autonomous charging option is programmed through PROG pin resistor. End-of-charge auto control based on charging current and charging voltage, no SMBus communication needed. Safety timer is also implemented to stop charging. Go to Japanese
Jan 1, 1970 -
When the ISL9238 is used in USB OTG mode, is it possible to modify the current sense resistor to allow the circuit to source 8A?
Question: When the ISL9238 is used in USB OTG mode, is it possible to modify the current sense resistor to allow the circuit to source 8A? Answer: The software settable limit in the device is set for 4.096A when the sense resistor is 20mohm. The resistor can be changed ...
Jan 1, 1970 -
What is two-level adapter current limit?
Question: What is two-level adapter current limit? I see this term listed on your ISL9238 datasheet. Answer: Turbo event usually does not last very long. It is often no longer than milliseconds, a time length during which the adapter can supply current higher than its DC rating. The ISL9238 ...
Jan 1, 1970
Videos & Training
ISL9237 USB Type-C Buck-Boost Battery Chargers
Introducing the industry's first buck-boost battery charger supporting USB Type-C® connectors. The single-chip ISL9237 reduces BOM costs by up to 40% and extends battery life for ultrabooks, tablets, and power banks.
Transcript
The USB Type-C is a next generation industry standard that allows charging, data transfer, and video, all in one simple connector. It can deliver up to 20V or 100W over a single cable: tailored to fit mobile devices, yet robust enough for laptops and tablets. It features reversible plug orientation and cable direction, so it will no longer matter which end of the cable or which side of the connector you plug in. It is truly all-in-one connectivity standards for tablets, notebooks, or smartphones. The USB 3.1 compliant ISL9237 joins the emerging USB Type-C ecosystem as the first battery charger capable of providing buck mode, buck-boost mode, and boost mode for 1 to 3-cell lithium-ion batteries.
The single-chip ISL9237 replaces competitive buck and boost two-chip charger solutions, eliminating a charger IC and inductor, to reduce customer bill of material costs by up to 40%. It also supports USB On-The-Go (OTG) with a 5V ultra-reverse buck mode, and reduces traditional two-stage charging to a single stage buck-boost for improved efficiency. In charging mode, the ISL9237 takes input power from a wide range of DC power sources: AC/DC charger adaptors, USB power delivery ports and any travel adapter to charge battery packs with up to three series cell lithium-ion batteries.
The ISL9237 can also operate connected to only a battery, an adapter or both. The ISL9237's key features include: input voltage range of 3.2V to 23.4V, system output voltage of 2.4V to 13.1824V, up to 1MHz operation allows smaller, lower cost inductors, and reduces acoustic noise in DCM mode.
The ISL9237 battery charger is the latest member Renesas' family of mobile computing power management solutions, which include the ISL95852, Vcore PMIC, and the ISL95908 peripheral PMIC. These products power IMVP8 compliant systems using Renesas' sixth generation core processors. For more information about the ISL9237 buck-boost charger IC, please visit the ISL9237 product page.
Video List
