DATASHEET To request the full datasheet, please visit www.intersil.com/products/isl91107 High Efficiency Buck-boost Regulator with 3.8A Switches ISL91107 Features The ISL91107 is a highly-integrated buck-boost switching regulator that accepts input voltages either above or below the regulated output voltage. Unlike other buck-boost regulators, this regulator automatically transitions between operating modes without significant output disturbance. • Accepts input voltages above or below regulated output voltage This device is capable of delivering up to 2A of output current (PVIN = 2.8V, VOUT = 3.3V) and provides excellent efficiency due to its fully synchronous 4-switch architecture. No-load quiescent current of only 45µA also optimizes efficiency under light-load conditions. The ISL91107 is designed for standalone applications and supports 3.3V fixed output voltages or variable output voltages with an external resistor divider. Output voltages as low as 1V or as high as 5.2V are supported using an external resistor divider. The ISL91107 requires only a single inductor and very few external components. Power supply solution size is minimized by a 2.15mmx1.51mm WLCSP and 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 2A (PVIN = 2.8V, VOUT = 3.3V) • High efficiency: up to 96% • 45µA quiescent current maximizes light load efficiency • 2.5MHz switching frequency minimizes external component size • Selectable forced PWM mode • Fully protected for short-circuit, over-temperature and undervoltage • Small 2.15mmx1.51mm WLCSP Applications • Smartphones and tablet PCs • Wireless communication devices • 2G/3G/4G power amplifiers Related Literature • AN1940, “ISL91107IIN-EVZ, ISL91107IIA-EVZ Evaluation Board User Guide” C1 22µF 100 ISL91107IIAZ PVIN MODE LX2 VOUT = 3.3V VOUT R1 187k EN FB R2 60.4k GND VIN = 4.2V 95 LX1 L1 1µH VIN VIN = 3.3V VIN = 3.8V PGND C4 22pF C2 2x22µF EFFICIENCY (%) VIN = 1.8V TO 5.5V 90 85 VIN = 2.5V 80 75 70 1 10 100 1000 LOAD CURRENT (mA) FIGURE 1. TYPICAL APPLICATION March 12, 2015 FN8584.2 1 FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (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 2014, 2015. 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. ISL91107 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 FN8584.2 March 12, 2015