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 (2.15mm x 1.74mm) package, and the ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN (4mm x 4mm) package. The 2.5MHz switching frequency further reduces the size of external components.
Features
- Accepts input voltages above or below the 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 2.15mm x 1.74mm WLCSP
Comparison
Applications
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
Support
Support Communities
Support Communities
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ISL91127IRAZ Datasheet error?
I am looking to using this buck/boost converter, ISL91127IRAZ, in a design that requires 5V from a LiPO battery. My plan was to use the ISL91127IRAZ because I can adjust it to output 5V. However when I read the datasheet for this device, see below, it says that ...
Jul 28, 2022 -
Max output current for ISL91127IRAZ under Vin=3.0V and Vout=5.0V
What's the maximum output current under Vin=3.0V and Vout=5.0V? Thanks.
Sep 3, 2024
FAQs
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Will the ISL91127 EN (enable) input work with 1.8V logic if the chip is powered from 5V?
Question: The datasheet for the ISL91127 specifies the VIH level logic threshold at 1.4V for the logic inputs when VIN = 3.6V. If I use the ISL91127 with VIN at 5V to 5.5V, will the EN logic threshold also go up? Will the EN input work reliably with ...
Jan 1, 1970 -
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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