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ISL9112 Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL9112 Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 20 page 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011, 2012. 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. 1.2A High Efficiency Buck-Boost Regulators ISL9110, ISL9112 The ISL9110 and ISL9112 are highly-integrated Buck-Boost switching regulators that accept input voltages either above or below the regulated output voltage. Unlike other Buck-Boost regulators, these regulators automatically transition between operating modes without significant output disturbance. Both parts are capable of delivering up to 1.2A output current, and provide excellent efficiency due to their fully synchronous 4-switch architecture. No-load quiescent current of only 35µA also optimizes efficiency under light-load conditions. Forced PWM and/or synchronization to an external clock may also be selected for noise sensitive applications. The ISL9110 is designed for standalone applications and supports 3.3V and 5V 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 ISL9112 supports a broader set of programmable features that may be accessed via an I2C bus interface. With a programmable output voltage range of 1.9V to 5V, the ISL9112 is ideal for applications requiring dynamically changing supply voltages. A programmable slew rate can be selected to provide smooth transitions between output voltage settings. The ISL9110 and ISL9112 require only a single inductor and very few external components. Power supply solution size is minimized by a tiny 3mmx3mm package and a 2.5MHz switching frequency, which further reduces the size of external components. Features • Accepts Input Voltages Above or Below Regulated Output Voltage • Automatic and Seamless Transitions Between Buck and Boost Modes • Input Voltage Range: 1.8V to 5.5V • Output Current: Up to 1.2A • High Efficiency: Up to 95% • 35µA Quiescent Current Maximizes Light-load Efficiency • 2.5MHz Switching Frequency Minimizes External Component Size • Selectable Forced-PWM Mode and External Synchronization •I2C Interface (ISL9112) • Fully Protected for Overcurrent, Over-temperature and Undervoltage • Small 3mmx3mm TDFN Package Applications • Regulated 3.3V from a Single Li-Ion Battery • Smart Phones and Tablet Computers • Handheld Devices •Point-of-Load Regulators Related Literature • See AN1648 “ISL9110IRTNEVAL1Z, ISL9110IRT7EVAL1Z, ISL9110IRTAEVAL1Z Evaluation Board User Guide” • See AN1647 “ISL9112IRTNEVAL1Z, ISL9112IRT7EVAL1Z EvaluationBoard User Guide” FIGURE 1. TYPICAL APPLICATION VOUT = 3.3V/1A VOUT 1 FB 12 C2 10µF BAT PG STATUS OUTPUTS 8 7 PVIN VIN = 1.8V TO 5.5V VIN 5 6 MODE EN 10 9 C1 10µF ISL9110IRTNZ LX1 LX2 4 2 L1 2.2µH IOUT (A) 70 75 80 85 90 95 100 0.01 0.05 0.25 1.25 VIN = 5V VIN = 2.5V VIN = 3V VOUT = 3.3V FIGURE 2. EFFICIENCY July 13, 2012 FN7649.2 |
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