The ISL91127 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 ISL91127 can deliver at least 2. 1A 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 ISL91127 supports 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 1V or as high as 5. 2V are supported. The ISL91127 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
  • 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

Product Options

Orderable Part ID 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 & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL91127IR Datasheet Datasheet PDF 1.01 MB
ISL91127 Datasheet Datasheet PDF 1.46 MB
User Guides & Manuals
ISL91127IIx-EVZ User Guide Manual PDF 1.23 MB
ISL91127IRN-EVZ, ISL91127IRA-EVZ User Guide Manual PDF 559 KB
Application Notes & White Papers
Preventing Subsystem Brownouts in Mobile Devices 简体中文 White Paper PDF 572 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
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
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options Application Note PDF 650 KB
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods Application Note PDF 387 KB
AN7244: Understanding Power MOSFETs Application Note PDF 349 KB
Other
ISL91127IIN-EVZ Design Files Design File ZIP 577 KB
ISL91127IIA-EVZ Design Files Design File ZIP 578 KB
ISL91127IRN-EVZ Design Files Design File ZIP 1.14 MB
ISL91127IRA-EVZ Design Files Design File ZIP 1.14 MB

Boards & Kits

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