TPS54821 - 具有打嗝过流保护的 4.5V 至 17V 输入、8A 同步降压 SWIFT 转换器

TPS54821是TI德州仪器公司的一款转换器（集成开关）产品，TPS54821是具有打嗝过流保护的 4.5V 至 17V 输入、8A 同步降压 SWIFT 转换器，本站介绍了TPS54821的封装应用图解、特点和优点、功能等，并给出了与TPS54821相关的TI元器件型号供参考。

TPS54821 - 具有打嗝过流保护的 4.5V 至 17V 输入、8A 同步降压 SWIFT 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

Integrated 26 mΩ / 19 mΩ MOSFETs
Split Power Rail: 1.6 V to 17 V on PVIN
200 kHz to 1.6 MHz Switching Frequency
Synchronizes to External Clock
0.6V ±1% Voltage Reference Over Temperature
Low 2 µA Shutdown Quiescent Current
Monotonic Start-Up into Pre-biased Outputs
Adjustable Slow Start/Power Sequencing
Power Good Output Monitor for Undervoltage and Overvoltage
Adjustable Input Undervoltage Lockout
Software Tools Available
For SWIFT™ Documentation visit http://www.ti.com/swift

产品应用

Digital TV Power Supplies
Set Top Boxes
Blu-ray DVDs
Home Terminals
High Performance Point of Load Regulation

产品说明

The TPS54821 in thermally enhanced 3.5 mm x 3.5 mm QFN package is a full featured 17 V, 8 A synchronous step down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor's footprint.

The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.

Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the device when the die temperature exceeds the thermal shutdown temperature and enables the part again after the built-in thermal shutdown hiccup time.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS54821	VQFN (14)	3.50 mm x 3.50 mm

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