Renesas Electronics Corporation

High-Efficiency Buck-Boost Regulator with 4.5 A Switches

Renesas' high-efficiency buck-boost regulator accepts input voltages above or below regulated output voltage

Image of Renesas' High-Efficiency Buck-Boost RegulatorRenesas' ISL91127 is a high-current, buck-boost switching regulator for systems using battery chemistries. It uses 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 is capable of delivering at least 2.1 A continuous output current (VOUT = 3.3 V) over a battery voltage range of 2.5 V to 4.35 V. 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 30 µA optimizes efficiency under all load conditions.

Features
  • Accepts input voltages above or below regulated output voltage 
  • Automatic and seamless transitions between buck and boost modes
  • Input voltage range: 1.8 V to 5.5 V
  • Continuous output current: up to 2.1 A (PVIN = 2.5 V, VOUT = 3.3 V)
  • High efficiency: up to 96%
  • 30 µA quiescent current maximizes light-load efficiency
  • 2.5 MHz switching frequency minimizes external component size
  • Fully protected for short-circuit, over-temperature, and undervoltage
  • Small, 2.15 mm x 1.74 mm WLCSP
Applications
  • Brownout-free system voltage for smartphones and tablet PCs
  • Wireless communication devices
  • 2G, 3G, and 4G RF power amplifiers

High-Efficiency Buck-Boost Regulators

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
IC REG BUCK BST ADJ/1V 2A 20QFNISL91127IRAZ-T7AIC REG BUCK BST ADJ/1V 2A 20QFN11900 - Immediate
3000 - Factory Stock		$25.45View Details
IC REG BUCK BOOST 3.3V 2A 20QFNISL91127IRNZ-T7AIC REG BUCK BOOST 3.3V 2A 20QFN451 - Immediate
5500 - Factory Stock		$25.45View Details

Eval Board

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
EVAL BOARD FOR ISL91127IRISL91127IRA-EVZEVAL BOARD FOR ISL91127IR9 - Immediate$750.57View Details
EVAL BOARD FOR ISL91127IRISL91127IRN-EVZEVAL BOARD FOR ISL91127IR1 - Immediate$750.57View Details
Published: 2016-10-27

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Related Articles and Blogs

Buck-Boost Design Solutions Fundamentally, there are two common topologies for changing a source voltage to that required by a load. Buck regulation steps down the input voltage, while boost is a voltage step-up topology.

Related Product Training Modules

ISL9120IR-107IR-127IR Buck-Boost Overview Discuss the Buck-Boost architecture for battery-powered applications.