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TPS61099x Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS61099x Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 22 page Current Sense Boost Gate Driver Pulse Modulator B2 B1 A1 Logic Control C1 REF SW EN VOUT VIN Pass-Through VPSTH C2 TPS61099x TPS61099 (1) Thermal Shutdown OCP UVLO Down Mode VDOWN Startup Protection (OCP, OVP) OVP A2 FB GND Copyright © 2016, Texas Instruments Incorporated 8 TPS61099, TPS610997 SLVSD88B – JULY 2016 – REVISED DECEMBER 2016 www.ti.com Product Folder Links: TPS61099 TPS610997 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS61099x synchronous step-up converter is designed for alkaline battery, coin-cell battery, Li-ion or Li- polymer battery powered systems, which requires long battery running time and tiny solution size. The TPS61099x can operate with a wide input voltage from 0.7 V to 5.5 V. It only consumes 1 µA quiescent current and can achieve high efficiency under light load condition. The TPS61099x operates in a hysteretic control scheme with typical 1-A peak switch current limit. The TPS61099x provides the true shutdown function and the load is completely disconnected from the input so as to minimize the leakage current. It also adopts Down Mode and Pass-Through operation when input voltage is close to or higher than the regulated output voltage. The TPS61099x family is available in both adjustable and fixed output voltage versions. Adjustable version offers programmable output voltage for flexible applications while fixed versions offer minimal solution size and achieve up to 75% high efficiency under 10-µA load. 8.2 Functional Block Diagrams (1) Internal FB resistor divider is implemented in fixed output voltage versions. Figure 11. Functional Block Diagram 8.3 Feature Description 8.3.1 Boost Controller Operation The TPS61099x boost converter is controlled by a hysteretic current mode controller. This controller regulates the output voltage by keeping the inductor ripple current constant in the range of 300 mA and adjusting the offset of this inductor current depending on the output load. Since the input voltage, output voltage and inductor value all affect the rising and falling slopes of inductor ripple current, the switching frequency is not fixed and is determined by the operation condition. If the required average input current is lower than the average inductor current defined by this constant ripple, the inductor current goes discontinuously to keep the efficiency high under light load condition. Figure 12 illustrates the hysteretic current operation. If the load current is reduced further, the |
Numéro de pièce similaire - TPS61099x |
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Description similaire - TPS61099x |
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