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

Applications

  • Handheld and battery powered consumer and medical devices
  • Brownout free system voltage for smartphones and tablet PCs
  • Wireless communication devices
  • 2G/3G/4G RF power amplifiers

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active WLCSP-TKCURDL Reel 3000
Availability
Active WLCSP-TKCURDL Reel 250
Availability
Active WLCSP-TKCURDL Reel 3000
Availability
Active WLCSP-TKCURDL Reel 250
Availability
Active WLCSP-TKCURDL Reel 3000
Availability
Active WLCSP-TKCURDL Reel 250
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL91127IR Datasheet Datasheet PDF 1.01 MB
ISL91127 Datasheet Datasheet PDF 1.46 MB
Application Notes & White Papers
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
Preventing Subsystem Brownouts in Mobile Devices 简体中文 White Paper PDF 572 KB

Boards & Kits

Part Number Title Type Company
ISL91127IRA-EVZ High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board Evaluation Renesas
ISL91127IRN-EVZ High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board Evaluation Renesas
Snowflake-Ornament-Reference-Design Snowflake Ornament Reference Design Featuring Power and Analog Components Reference Renesas
ISL91127IIN-EVZ High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board Evaluation Renesas
ISL91127IIA-EVZ High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board Evaluation Renesas
ISL91127II2A-EVZ High-Efficiency Buck-Boost Regulators with 4.5A Switches Evaluation Board Evaluation Renesas

News & Additional Resources