TPS40000

低输入 2.25V-5.5V 300kHz 频率同步降压控制器，仅用作源控制器

The TPS4000x are controllers for low-voltage, non-isolated synchronous buck regulators. These controllers drive an N-channel MOSFET for the primary buck switch, and an N-channel MOSFET for the synchronous rectifier switch, thereby achieving very high-efficiency power conversion. In addition, the device controls the delays from main switch off to rectifier turn-on and from rectifier turn-off to main switch turn-on in such a way as to minimize diode losses both conduction and recovery in the synchronous rectifier with ’s proprietary Predictive Gate Drive™ technology. The reduction in these losses is significant and increases efficiency. For a given converter power level, smaller FETs can be used, or heat sinking can be reduced or even eliminated.

The current-limit threshold is adjustable with a single resistor connected to the device. The TPS4000x controllers implement a closed-loop soft start function. Startup ramp time is set by a single external capacitor connected to the SS/SD pin. The SS/SD pin is also used for shutdown.

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Operating Input Voltage 2.25 V to 5.5 V

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Output Voltage as Low as 0.7 V

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1% Internal 0.7 V Reference

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Predictive Gate Drive™ N-Channel MOSFET Drivers for Higher Efficiency

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Externally Adjustable Soft-Start and Overcurrent Limit

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Source-Only Current or Source/Sink Current

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Versions for Starting into VOUT Pre-Bias

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10-Lead MSOP PowerPad™ Package for Higher Performance

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Thermal Shutdown

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Internal Boostrap Diode

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Fixed-Frequency, Voltage-Mode Control

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/1/4 300-kHz

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TPS40002/3/5 600-kHz

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APPLICATIONS

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Networking Equipment

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Telecom Equipment

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Base Stations

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Servers

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DSP Power

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Power Modules

PowerPAD™ and Predictive Gate Drive™ are trademarks of Texas Instruments Incorporated.