Overview
Description
The ISL91127 and ISL91127IR are high-current buck-boost switching regulators for systems using new battery chemistries. They use 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.
They are capable of delivering at least 2A continuous output current (VOUT = 3.3V) over 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. The ISL91127 and ISL91127IR have a fully synchronous low ON-resistance, 4-switch architecture and a low quiescent current of only 30µA optimize efficiency under all load conditions.
The ISL91127 and ISL91127IR support stand-alone applications with a fixed 3.3V or 3.5V output voltage or adjustable output voltage with an external resistor divider. Output voltages as low as 1.0V or as high as 5.2V are supported.
The ISL91127 is available in a 20 bump, 0.4mm pitch WLCSP (2.15mmx1.74mm) package, and the ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN (4mmx4mm) package. The 2.5MHz switching frequency 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
- Input voltage range: 1.8V to 5.5V
- Continuous output current: up to 2.1A (PVIN = 2.5V, VOUT
- High efficiency: up to 96%
- 30µA quiescent current maximizes light-load efficiency
- 2.5MHz switching frequency minimizes external component size
- Fully protected for short-circuit, over-temperature, and undervoltage
- Small 2.15mmx1.74mm WLCSP
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1.01 MB | |
| Datasheet | PDF 1.50 MB | |
| White Paper | PDF 572 KB 简体中文 | |
| Application Note | PDF 592 KB | |
| Application Note | PDF 509 KB | |
| Application Note | PDF 397 KB | |
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Design & Development
Boards & Kits
Evaluation
ISL91127IRA-EVZ
Active
High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board
The ISL91127IRA-EVZ platform allows for quick evaluation of the high-performance features of the ISL91127IR buck-boost regulator.
The ISL91127IR is a high-current buck-boost switching regulator for systems using new battery chemistries in a 20 Ld, 0.5mm pitch QFN (4mm x 4mm) package. It uses...
Recommended Documents:
Evaluation
ISL91127IRN-EVZ
Active
High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board
The ISL91127IRN-EVZ platform allows for quick evaluation of the high-performance features of the ISL91127IR buck-boost regulator.
The ISL91127IR is a high-current buck-boost switching regulator for systems using new battery chemistries in a 20 Ld, 0.5mm pitch QFN (4mm x 4mm) package. It uses...
Recommended Documents:
Evaluation
ISL91127IIN-EVZ
Active
High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board
The ISL91127IIN-EVZ, ISL91127II2A-EVZ and ISL91127IIA-EVZ platforms allow quick evaluation of the high-performance features of the ISL91127 buck-boost regulator series. The ISL91127IIN-EVZ evaluates the ISL91127IINZ with fixed 3.3V output voltage.
The ISL91127 is a high-current buck-boost...
Recommended Documents:
Evaluation
ISL91127II2A-EVZ
Active
High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board
The ISL91127IIN-EVZ, ISL91127II2A-EVZ and ISL91127IIA-EVZ platforms allow quick evaluation of the high-performance features of the ISL91127 buck-boost regulator series. The ISL91127II2A-EVZ evaluates the ISL91127II2AZ with fixed 3.5V output voltage.
The ISL91127 is a high-current buck-boost...
Recommended Documents:
Evaluation
ISL91127IIA-EVZ
Active
High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board
The ISL91127IIN-EVZ, ISL91127II2A-EVZ and ISL91127IIA-EVZ platforms allow quick evaluation of the high-performance features of the ISL91127 buck-boost regulator series. The ISL91127IIA-EVZ evaluates the ISL91127IIAZ with resistor programmable output voltage.
The ISL91127 is a high-current...
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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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Blog Post
Oct 12, 2020
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