DATA SHORT To request the full datasheet, please visit www.intersil.com/products/ISL91127 High Efficiency Buck-Boost Regulator with 4.5A Switches ISL91127 Features The ISL91127 is a high-current buck-boost switching regulator for systems using new battery chemistries. It uses Intersil’s 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. • Accepts input voltages above or below regulated output voltage The ISL91127 is capable of delivering at least 2.1A 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. 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 standalone 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. • Automatic and seamless transitions between buck and boost modes • Input voltage range: 1.8V to 5.5V • Output current: up to 2.1A (PVIN = 2.5V, VOUT = 3.3V) • Burst current: up to 3A (PVIN = 3V, VOUT = 3.3V, tON < 600µs, t = 4.6ms) • 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 • Brownout-free system voltage for smartphones and tablet PCs Related Literature • Wireless communication devices • UG045, “ISL91127IIx-EVZ Evaluation Boards User Guide” • 2G/3G/4G RF power amplifiers 100 VIN = 3.6V VIN = 4V IS L 9 1 1 2 7 IIN Z V IN = 1 . 8 V T O 5 .5 V LX1 P V IN C1 10µF L1 1µH LX2 V IN VOUT EN FB PGND SGND MODE V O U T = 3 .3 V C2 2x22µF EFFICIENCY (%) 95 90 85 VIN = 3.3V VIN = 3V VIN = 2.5V 80 75 1 10 100 100 0 LOAD CURREN T (mA) FIGURE 1. TYPICAL APPLICATION: VOUT = 3.3V April 5, 2016 FN8418.0 1 FIGURE 2. EFFICIENCY: VOUT = 3.3V CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL91127 For additional products, see www.intersil.com/en/products.html Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 2 FN8418.0 April 5, 2016