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
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.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Input Voltage (Min) (V) | 3.2 |
| Input Voltage (Max) (V) | 23.4 |
| Input Current Limit Accuracy (% (±)) | 2 |
| Battery Charge Voltage | 2.4 to 18.304 |
| Charging Voltage Accuracy (Max) (±%) | -1.1, 0.5 |
| Battery Charge Voltage Adjustment | 8mV steps |
| Charge Current Limit Accuracy | ±2 (4A, CSOP - CSON = 60mV) |
| Trickle Charge Current Range | 64mA, 128mA, 256mA, or 512mA |
| Switching Frequency Range (Typical) (kHz) | 635 - 1000 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFN | 4.0 x 4.0 x 0.70 | 32 | 0.4 |
Applications
- 1 to 4-cell tablets
- Ultrabooks
- Notebooks
- Power banks
- Any USB-C interface portable device requiring batteries
Renesas Boards & Kits
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... Read More
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Model-Based Development PlatformOffers electrochemical battery models designed to run on Renesas battery management solution platforms, enabling more accurate state estimation and improved overall battery performance.Provided By: BattGenie
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- Model-Based Development PlatformOffers electrochemical battery models designed to run on Renesas battery management solution platforms, enabling more accurate state estimation and improved overall battery performance.Provided By: BattGenie
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Support Communities
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Units in inductor ripple current calculation in ISL9238
Hello While calculatiing the induction ripple currrent in ISL9238, don't know which units would be in the output of the formula. Is it A? I am using uH in L and Khz in Fsw Thanks
Apr 19, 2026 -
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 -
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
Knowledge Base
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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
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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 ...
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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 ...
Support Communities
