Overview
Description
The ISL91128 is a high-current, buck-boost switching regulator for systems using new battery chemistries. It uses the Renesas proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. The device also includes a selectable Bypass mode for low power consumption in applications that have a Sleep or Low Power mode.
The ISL91128 is capable of delivering at least 2.2A continuous output current (VOUT = 3.3V) across a battery voltage range of 2.5V to 4.35V. This maximizes the energy utilization of advanced, single-cell Li-ion battery chemistries that have significant capacity left at voltages below the system voltage. Its fully synchronous low ON-resistance 4-switch architecture and a low quiescent current of only 30µA optimize efficiency under all load conditions.
The ISL91128 supports a broader set of programmable features that can be accessed using an I2C bus interface. With a programmable output voltage range of 1.9V to 5.0V, the ISL91128 is ideal for applications requiring dynamically changing supply voltages. A programmable slew rate can be selected to provide smooth transitions between output voltage settings.
The ISL91128 is available in a 20-bump, 0.4mm pitch WLCSP (2.15mm x 1.74mm) with a 2.5MHz switching frequency, which further reduces the size of external components.
Features
- Accepts input voltages above or below regulated output voltage
- Automatic and seamless transitions between Buck and Boost modes
- I2C interface
- Input voltage range: 1.8V to 5.5V
- Continuous output current: up to 2.4A (PVIN = 2.5V, VOUT = 3.3V)
- High efficiency: up to 96%
- 30µA quiescent current maximizes light-load efficiency
- Selectable bypass power saving mode operation
- 2.5MHz switching frequency minimizes the external component size
- Fully protected from short-circuit, over-temperature, and undervoltage
- Small 2.15mm x 1.74mm WLCSP
Comparison
Applications
Documentation
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Type | Title | Date |
Datasheet | PDF 1.07 MB | |
Application Note | PDF 592 KB | |
Application Note | PDF 509 KB | |
Application Note | PDF 397 KB | |
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Design & Development
Support
Support Communities
FAQs
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Which buck-boost regulators of the ISL91127 and ISL91128 families have an I2C interface?
Question: Which of these buck-boost regulators have an I2C interface? Answer: Of the products of these families, only the ISL91128 has an I2C interface. Another buck-boost regulator with I2C interface is ISL9112.
Jan 1, 1970
News & Blog Posts
Blog Post
Oct 12, 2020
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