The ISL9120 and ISL9120IR are highly integrated buck-boost switching regulators that accept input voltages either above or below the regulated output voltage. The regulator automatically transitions between buck and boost modes without significant output disturbance. They also have automatic bypass functionality. When the input voltage is generally within 1% to 2% of the output voltage, there will be a direct bypass connection between the VIN and VOUT pins.

In addition to the automatic bypass functionality, the ISL9120 and ISL9120IR also have forced bypass functionality with the use of the BYP pin. The device is capable of delivering up to 800mA of output current (VIN = 2.5V, VOUT = 3.3V) and provides excellent efficiency due to its adaptive current limit Pulse Frequency Modulation (PFM) control architecture.

The ISL9120 and ISL9120IR are designed for stand-alone applications and support a 3.3V fixed output voltage or variable output voltages with an external resistor divider. The forced bypass power saving mode can be chosen if voltage regulation is not required. The device consumes less than 3.5µA of current over the operating temperature range in forced bypass mode.

The ISL9120 and ISL9120IR require only a single inductor and very few external components. Power supply solution size is minimized by the ISL9120 1.41mm x 1.41mm WLCSP package and the ISL9120IR 3mm x 3mm 12 Ld TQFN package.

Features

  • Accepts input voltages above or below regulated output voltage
  • Automatic bypass mode functionality
  • Automatic and seamless transitions between buck and boost modes
  • Input voltage range: 1.8V to 5.5V
  • Selectable forced bypass power-saving mode
  • Adaptive multilevel current limit scheme to optimize efficiency at low and high currents
  • Output current: up to 800mA (VIN = 2.5V, VOUT = 3.3V)
  • High efficiency: up to 98%
  • 41μA quiescent current maximizes light-load efficiency
  • Fully protected for over-temperature and undervoltage
  • Small packages
    • ISL9120 - 1.41mm x 1.41mm WLCSP
    • ISL9120IR - 3mm x 3mm 12 Ld TQFN

Applications

  • Smartphones and tablets
  • Portable consumer and wearable devices

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active WLCSP-BP Reel 3000
Availability
Active WLCSP-BP Reel 250
Availability
Active WLCSP-BP Reel 3000
Availability
Active WLCSP-BP Reel 250
Availability
Active TQFN Tube 100
Availability
Active TQFN Reel 3000
Availability
Active TQFN Reel 250
Availability
Active TQFN Tube 100
Availability
Active TQFN Reel 3000
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL9120 Datasheet Datasheet PDF 731 KB
ISL9120IR Datasheet Datasheet PDF 735 KB
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
A Smarter Way to Power Wearable Devices 简体中文 White Paper PDF 576 KB
PCNs & PDNs
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 327 KB
PCN21005 - Alternate assembly facility of the listed Renesas DFN / QFN / TDFN / TQFN packaged products Product Change Notice PDF 158 KB
PCN20025 - Carrier Tape dimension change for the listed Renesas WLCSP Packaged Products Product Change Notice PDF 126 KB

Boards & Kits

Part Number Title Type Company
ISL9120IIA-EVZ Compact High-Efficiency Low Power Buck-Boost Regulator Evaluation Board Evaluation Renesas
ISL9120IIN-EVZ Compact High-Efficiency Low Power Buck-Boost Regulator Evaluation Board Evaluation Renesas
ISL9120IRA-EVZ Compact High-Efficiency Low Power Buck-Boost Regulator Evaluation Board Evaluation Renesas
ISL9120IRN-EVZ Compact High-Efficiency Low Power Buck-Boost Regulator Evaluation Board Evaluation Renesas
Pet-Activity-Monitor-Reference-Design Reference Design to Monitor Pet Activity and Sound Featuring the Renesas Synergy™ S3A3 MCU Reference Renesas
Smart-Medicine-Box Smart Medicine Box Reference Design Reference Renesas
Smart-Medicine-Box-with-BLE Smart Medicine Box with BLE Reference Design Reference Renesas

News & Additional Resources