TI公司的TPS51397A是单片4.5V-24V 10A带ULQ™操作的同步降压转换器,集成的MOSFET具有高效率和容易使用,外接元件数量最少,从而节省了电源系统的空间. TPS51397A采用D-CAP3™控制,提供内部补偿的最快的瞬态响应和极好的线路和负载调整.ULQ™ (超低静态电流)在低功耗工作中延成电池寿命有极大的好处.器件的输入电压为4.5V到24V,输出电压为0.6V到5.5V,支持10A连续电流输出,0.6 V ± 1%反馈精度(25C).集成的17-mΩ和5.9-mΩ FET,通过MODE引脚可选择Eco-mode™和Out-of-Audio™,500kHz和800kHz可选择开关频率,可选择软起动时间,默认间隔1.2ms,大占空比操作,集成了功率良好指示器,内置输出放电功能,逐个周期的过流保护,闭锁输出OV和UV保护,非闭锁UVLO和OT保护,工作结温度-40C 到125C,23引脚3.0x3.0 mm HotRod™ VQFN封装.主要用在笔记本和PC电脑,超级本,手持平板计算机,工业PC<单板计算机和分布电源系统.本文介绍了TPS51397A主要特性,功能框图, 5V 10A参考设计电路图及其参考设计主要参数,以及评估模块TPS51397AEVM主要特性,电路图,材料清单和PCB设计图.

The device is a monolithic 10-A synchronous buckconverter with integrated MOSFETs that enable highefficiency and offers ease-of-use with minimumexternal component count for space-conscious powersystems.

The TPS51397A employs D-CAP3™ control thatprovides fast transient response and excellent lineand load regulation with internal compensation. TheULQ™ (Ultra Low Quiescent) feature is extremelybeneficial for long battery life in low power operation.

The large duty operation greatly improves the loadtransient performance when input voltage is low.

The MODE pin can be used to set Eco-mode™ orOut-of-Audio™ (OOA) mode for light-load operationand 500-kHz or 800-kHz switching frequency. TheEco-mode™ maintains high efficiency during light loadoperation. The OOA mode keeps the switching

frequency above audible frequency with minimumreduction in efficiency.

The device supports both internal and external softstartoptions. It has an internal fixed soft-start time of1.2 ms.If the application needs a longer soft-starttime, the external SS pin can be connected to anexternal capacitor.

The TPS51397A integrates a power-good indicatorand provides an output discharge function. It providescomplete protection including OVP, UVP, OCP, OTP,and UVLO. The device is available in a 20-pin 3.0-mmx 3.0-mm HotRod™ package and the junction

temperature is specified from –40C to 125C.

TPS51397A主要特性:

• Input voltage range: 4.5 V to 24 V

• Output voltage range: 0.6 V to 5.5 V

• Supports 10-A continuous output current

• D-CAP3™ architecture control for fast transientresponse

• 0.6 V ± 1% feedback voltage accuracy (25C)

• Integrated 17-mΩ and 5.9-mΩ FETs

• ULQ™ operation (110 μA) to enable long batterylife during system standby

• Selectable Eco-mode™ and Out-of-Audio™ byMODE pin

• 500-kHz and 800-kHz selectable switchingfrequency

• Adjustable soft-start time with default internal 1.2ms

• Large duty cycle operation

• Integrated power-good indicator

• Built-in output discharge function

• Cycle-by-cycle overcurrent protection

• Latched output OV and UV protections

• Non-latched UVLO and OT protections

• -40C to 125C Operating junction temperature

• 20-pin 3.0-mm × 3.0-mm HotRod™ VQFN package

• Pin-to-pin compatible with 12-A TPS56C230

• Create a custom design using the TPS51397Awith the WEBENCH® Power Designer

TPS51397A应用:

• Notebook and PC computers

• Ultrabook, handheld tablet computers

• Industrial PC, single-board computers

• Non-military drone

• Distributed power systems

图1.TPS51397A功能框图

图2. TPS51397A 5V 10A参考设计电路图

参考设计主要参数:

评估模块TPS51397AEVM

This users guide contains information for the TPS51397A evaluation module (EVM) as well as for theTPS51397A DC/DC converter. Also included are the performance specifications, schematic, layout and, the billof materials for the TPS51397AEVM.

图3.评估模块TPS51397AEVM外形图(正面)

图4.评估模块TPS51397AEVM外形图(背面)

图5.评估模块TPS51397AEVM电路图

评估模块TPS51397AEVM材料清单:

图6.评估模块TPS51397AEVM PCB设计图(1):顶层装配

图7.评估模块TPS51397AEVM PCB设计图(2):顶层

图8.评估模块TPS51397AEVM PCB设计图(3):层1

图9.评估模块TPS51397AEVM PCB设计图(4):层2

图10.评估模块TPS51397AEVM PCB设计图(5):底层