High Efficiency Buck-Boost Regulator with 4.5A Switches and I²C Interface
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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 I2 C 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 (2.15mmx1.74mm) 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 external component size
- Fully protected for short-circuit, over-temperature, and undervoltage
- Small 2.15mmx1.74mm WLCSP
Applications
Applications
- Brownout-free system voltage for smart phones and tablet PCs
- Wireless communication devices
- 2G/3G/4G RF power amplifiers
Design & Development
Boards & Kits
Boards & Kits
High-Efficiency Buck-Boost Regulator with 4.5A Switches and I²C Interface Evaluation Board
The ISL91128IIN-EVZ platform allows quick evaluation of the high-performance features of the ISL91128 buck-boost regulator. The ISL91128 is a high-current, buck-boost...
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Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Product Options
Processing table
ISL91128IINZ-T Active Samples Available |
WLCSP-TKCURDL | Reel | 3000 | Get Samples, |
ISL91128IINZ-T7A Active Samples Available |
WLCSP-TKCURDL | Reel | 250 | Get Samples, |
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| How to Conserve Battery Power in IoT Devices | Blog Post | Oct 9, 2020 |
