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Intersil公司的ISL9110和ISL9112是高度集成升降壓開關穩(wěn)壓電源,輸入電壓可高于或低于輸出電壓,并可在降壓和升壓模式無縫轉換,輸入電壓1.8V-5.5V,輸出電流1.2A,效率高達95%,靜態(tài)電流35uA,開關頻率2.5MHz,I2C接口,主要應用在單個鋰電池的3.3V穩(wěn)壓器,智能手機和平板電腦,手持設備和POL穩(wěn)壓器.本文介紹了ISL9110和ISL9112主要特性, 方框圖,幾種典型應用電路圖,以及ISL9110IRTNZ/IRT7Z/IRTAZ-EVAL1Z評估板主要特性,電路圖和相應的材料清單與PCB元件布局圖. 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. ISL9110和ISL9112主要特性: • 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 ISL9110和ISL9112應用: • Regulated 3.3V from a Single Li-Ion Battery • Smart Phones and Tablet Computers • Handheld Devices • Point-of-Load Regulators 
圖1. ISL9110和ISL9112方框圖
圖2. ISL9110IRTAZ 典型應用電路圖
圖3. ISL9112典型應用電路圖
圖4. ISL9112IRTNZ 典型應用電路圖 ISL9110IRTNZ/IRT7Z/IRTAZ-EVAL1Z評估板 評估板主要特性: • ISL9110IRTAZ high efficiency buck-boost regulator with adjustable output voltage • Input voltage rating from 1.8V to 5.5V • Resistor programmable output voltage, set to 3.3V • 1200mA output current at VIN ≥ 3V and VOUT = 3.3V • 2.5MHz switching frequency • Jumper selectable EN (enabled/disabled) • Jumper selectable MODE (auto-PFM/forced-PWM) • LED indicators for PG and BAT status outputs • Connectors, test points and jumpers for easy evaluation
圖5.ISL9110IRTAZ-EVAL1Z評估板電路圖 ISL9110IRTAZ-EVAL1Z評估板材清單:
圖6. ISL9110IRTNZ-EVAL1Z 評估板電路圖 ISL9110IRTNZ-EVAL1Z評估板材清單:
圖7. ISL9110IRT7Z-EVAL1Z 評估板電路圖 ISL9110IRT7Z-EVAL1Z評估板材清單:
圖8.ISL9110評估板元件布局圖(頂層) 詳情請見: http://www.intersil.com/data/fn/fn7649.pdf 和 http://www.intersil.com/data/an/an1648.pdf |
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