DATASHEET To request the full datasheet, please visit www.intersil.com/products/isl9120 Compact High Efficiency Low Power Buck-Boost Regulator ISL9120 Features The ISL9120 is a highly integrated buck-boost switching regulator that accepts input voltages either above or below the regulated output voltage. This regulator automatically transitions between buck and boost modes without significant output disturbance. The ISL9120 also has automatic bypass functionality for 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 also has forced bypass functionality with the use of the BYP pin. • Accepts input voltages above or below regulated output voltage This 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. • 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 The ISL9120 is designed for stand-alone applications and supports 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. • Fully protected for over-temperature and undervoltage The ISL9120 requires only a single inductor and very few external components. Power supply solution size is minimized by a 1.41mmx1.41mm WLCSP. • Portable consumer and wearable devices • Small 1.41mmx1.41mm WLCSP Applications • Smartphones and tablets Related Literature UG023, “ISL9120IIx-EVZ Evaluation Board User Guide” 100 C1 10F VIN = 3.6V ISL9120IINZ VIN 95 LX1 L1 1H LX2 ENABLE DISABLE FORCED BYPASS BUCK-BOOST EN VOUT VOUT = 3.3V FB C2 22F TO 47F BYP EFFICIENCY (%) VIN = 1.8V TO 5.5V 90 85 VIN = 3V VIN = 4V VIN = 3.4V VIN = 2.5V 80 75 GND PGND 70 FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION January 29, 2016 FN8659.1 1 1 10 100 OUTPUT CURRENT (mA) 1000 FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C 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 2015, 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. ISL9120 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 FN8659.1 January 29, 2016