TI公司的TPS543620是高效率4V-18V输入6A同步SWIFT降压转换器,具有内部补偿的固定频率先进电流模式控制,开关频率高达2.2MHz.器件是小型2.5-mm x 3-mm HotRod　VQFN封装,和高效率和高昂频率一起,使它最适合用在小型解决方案的地方.固定频率控制器工作从500 kHz 到 2.2 MHz,采用SYNC引脚能和外时钟同步.其它特性还包括高精度基准电压,可选择软起动时间,单调起动进入预偏压输出,可选择电流限制,通过EN引脚可调UVLO和全套的故障保护.器件集成了25-mΩ和6.5-mΩ MOSFET,输入电压范围4V到18V,输出电压0.5V到5.5V,三种可选择PWM斜率,以优化控制回路性能,五种可选择的开关频率:500 kHz,750 kHz, 1 MHz, 1.5 MHz和2.2 MHz.整个温度范围内的确基准电压精度为0.5-V, ±0.5%.可选择的软起动时间为0.5 ms, 1 ms, 2 ms和4 ms.可选择限流以支持6A和3A工作,提供输出过压保护,输出欠压保护,输入欠压保护,过流保护和超温保护.引脚和TPS543820和TPS543320兼容,结工作温度–40C到150C,采用2.5-mm × 3-mm 14引脚VQFN-HR封装,0.5-mm间距.本文介绍了TPS543620主要特性,功能框图和五种应用电路图,以及SWIFT™降压转换器评估模块TPS543620EVM主要特性,电路图,材料清单和PCB设计图.

TPS543620 4-V to 18-V Input, 6-A Synchronous SWIFT™ Step-Down Converter with

Internally Compensated Advanced Current Mode Control

The TPS543620 is a high-efficiency 18-V, 6-Asynchronous buck converter employing an internallycompensated,fixed-frequency Advanced CurrentMode control. It is capable of providing high efficiencywhile running at a switching frequency up to 2.2 MHz.

The device is in a small 2.5-mm x 3-mm HotRod™VQFN package, which coupled with high efficiency athigh frequency, makes it optimal for designs requiringa small solution size. The fixed frequency controllercan operate from 500 kHz to 2.2 MHz and can be

synchronized to an external clock using the SYNCpin. Additional features include a high accuracyvoltage reference, selectable soft start times,montonic start-up into pre-biased outputs, selectablecurrent limits, adjustable UVLO through the EN pin,and a full suite of fault protections.

TPS543620主要特性:

• Fixed-frequency, internally-compensated advancedcurrent mode (ACM) control

• Integrated 25-mΩ and 6.5-mΩ MOSFETs

• Input voltage range: 4 V to 18 V

• Output voltage range: 0.5 V to 5.5 V

• Three selectable PWM ramp options to optimizethe control loop performance

• Five selectable switching frequencies: 500 kHz,750 kHz, 1 MHz, 1.5 MHz, and 2.2 MHz

• Synchronizable to an external clock

• 0.5-V, ±0.5% voltage reference accuracy over fulltemperature range

• Selectable soft start times: 0.5 ms, 1 ms, 2 ms,and 4 ms

• Monotonic start-up into pre-biased outputs

• Selectable current limits to support 6-A and 3-Aoperation

• Enable with adjustable input undervoltage lockout

• Power good output monitor

• Output overvoltage, output undervoltage, inputundervoltage, overcurrent, and overtemperatureprotection

• Pin-to-pin compatible with TPS543820 andTPS543320

• –40C to 150C operating junction temperature

• 2.5-mm × 3-mm, 14-pin VQFN-HR package with0.5-mm pitch

图1. TPS543620功能框图

图2. TPS543620应用电路:12V输入,1.0V输出,1MHz

图3. TPS543620应用电路:12V输入,1.0V输出,1.5MHz

图4. TPS543620应用电路:12V输入,3.3V输出,1MHz

图5. TPS543620应用电路:12V输入,1.8V输出,1MHz

图6. TPS543620应用电路:12V输入,5.0V输出,1MHz

SWIFT™降压转换器评估模块TPS543620EVM

TPS543620 SWIFT™ Step-Down Converter Evaluation Module

The TPS543620EVM is an evaluation module (EVM) for the TPS543620. The TPS543620 is a synchronous buck converter, integrating both power MOSFETs with low drain to source resistance to minimize solution size and provide high efficiency at full load. The TPS543620 uses fixed frequency Advanced Current Mode control with low minimum on-time for high switching frequency to minimize solution size and achieve fast transient response.

评估模块TPS543620EVM主要特性:

Two circuits: one designed to demonstrate small solution area and one designed for easy evaluation of the TPS543620

Small solution area design uses 1.5-MHz switching frequency and fits within 100 square mm

Easy evaluation design includes jumpers to evaluate different settings selected by the FSEL and MODE pins of the TPS543620

3-state buffers to easily synchronize both designs to an external clock source

4.0-V to 18-V input voltage, 12-V nominal

1.0-V output at 6 A

图7.评估模块TPS543620EVM外形图(正面)

图8.评估模块TPS543620EVM外形图(背面)

评估模块TPS543620EVM小型(U1)性能特性:

评估模块TPS543620EVM高效率(U2)性能特性:

图9.评估模块TPS543620EVM PCB设计图:左:底面元件;右:正面元件

图10.评估模块TPS543620EVM PCB设计图:左:顶层布局;右:中1层布局

图11.评估模块TPS543620EVM PCB设计图:左:中2层布局;右:底层布局

图12.评估模块TPS543620EVMU1电路图

图13.评估模块TPS543620EVM U2电路图

评估模块TPS543620EVM材料清单: