TPS60121

稳压 3.3V 高功率充电泵 DC/DC 转换器

The TPS6012x step-up, regulated charge pumps generate a 3.3-V or 3-V ±4% output voltage from a 1.8-V to 3.6-V input voltage two alkaline, NiCd, or NiMH batteries. They can deliver an output current of at least 200 mA 100 mA for the TPS60122 and TPS60123, all from a 2-V input. Four external capacitors are needed to build a complete high efficiency dc/dc charge pump converter. To achieve the high efficiency over a wide input voltage range, the charge pump automatically selects between a 1.5x or doubler conversion mode. From a 2-V input, all ICs can start with full load current.

The devices feature the power-saving pulse-skip mode to extend battery life at light loads. TPS60120, TPS60122, and TPS60124 include a low battery comparator. , TPS60123, and TPS60125 feature a power-good output. The logic shutdown function reduces the supply current to a maximum of 1uA and disconnects the load from the input. Special current-control circuitry prevents excessive current from being drawn from the battery during start-up. This dc/dc converter requires no inductors, therefore EMI is of low concern. It is available in the small, thermally enhanced 20-pin PowerPADTM package PWP.

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High Average Efficiency Over Input Voltage Range Because of Special Switching Topology

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Minimum 200-mA Output Current From an Input Voltage Range of 1.8-V to 3.6-V

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Regulated 3.3-V or 3-V ±4% Output Voltage

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No Inductors Required, Low EMI

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Only Four External Components Required

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55-uA Quiescent Supply Current

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0.05-uA Shutdown Current

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Load Disconnected in Shutdown

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Integrated Low Battery and Power Good Detectors

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Evaluation Module Available TPS60120EVM-142

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Applications

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Applications Powered by Two Battery Cells

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Portable Instruments

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Battery-Powered Microprocessor Systems

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Miniature Equipment

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Backup-Battery Boost Converters

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PDAs, Organizers, Laptops

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MP-3 Portable Audio Players

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Handheld Instrumentation

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Medical Instruments e.g., Glucose Meters

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Cordless Phones

PowerPAD is a trademark of Texas Instruments Incorporated.