TPS54228

具有轻载效率的 4.5V 至 18V 输入、2A 同步降压转换器

The device is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54228 enables system designers to complete the suite of various end-equipment power bus regulators with a cost effective, low component count, low standby current solution. The main control loop for the TPS54228 uses the D-CAP2™ mode control that provides a fast transient response with no external compensation components. The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and Eco-Mode™ operation at light loads. Eco-Mode™ allows the TPS54228 to maintain high efficiency during lighter load conditions. The TPS54228 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance ESR output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 7 V. The device also features an adjustable soft start time. The TPS54228 is available in 8-pin SO , 8-pin SOIC, and 10-pin VSON packages, and is designed to operate over the ambient temperature range of –40°C to 85°C.

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D-CAP2™ Mode Enables Fast Transient Response

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Low Output Ripple and Allows Ceramic Output Capacitor

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Wide VIN Input Voltage Range: 4.5 V to 18 V

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Output Voltage Range: 0.76 V to 7 V

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Highly Efficient Integrated FETs Optimized

for Lower Duty Cycle Applications

– 155 mΩ High-Side and 108 mΩ Low-Side

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High Efficiency, Less than 10 µA at Shutdown

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High Initial Bandgap Reference Accuracy

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Adjustable Soft Start

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Prebiased Soft Start

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700-kHz Switching Frequency fSW

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Cycle-by-Cycle Overcurrent Limit

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Auto-Skip Eco-Mode™ for High Efficiency at Light Load