TI公司的TPS54618书全特性的6V6A同步降压电流模式转换器,集成了两个12m MOSFET,开关频率高达2MHz,从而减小了电感体积.0.8V±1%基准电压源,主要用在低压高密度电源系统,高性能DSP,FPGAASIC和MCU的POL稳压以及宽带,网络和光通信基础设备.本文介绍了TPS54618主要特性, 功能方框图, 高频UVLO调节的1.8V输出电源电路图以及TPS54618EVM-606评估模块主要指标,电路图和材料清单.
The TPS54618 device is a full featured 6 V, 6 A, synchronous step down current mode converter with two integrated MOSFETs.
The TPS54618 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2 MHz switching frequency, and minimizing the IC footprint with a small 3mm × 3mm thermally enhanced QFN package.
The TPS54618 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature.
Efficiency is maximized through the integrated 12m MOSFETs and 515µA typical supply current. Using the enable pin, shutdown supply current is reduced to 5.

TPS54618主要特性:
Two 12-m (typical) MOSFETs for High Efficiency at 6-A Loads
300kHz to 2MHz Switching Frequency
0.8 V ± 1% Voltage Reference Over Temperature (–40℃ to 150℃)
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
–40℃ to 150℃ Operating Junction Temperature Range
Thermally Enhanced 3mm × 3mm 16-pin QFN
Pin Compatible to TPS54418

TPS54618应用:
Low-Voltage, High-Density Power Systems
Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors
Broadband, Networking and Optical Communications Infrastructure

图1.TPS54618功能方框图

图2.TPS54618高频UVLO调节的1.8V输出电源电路图

TPS54618EVM-606评估模块
The TPS54618 dc/dc converter is designed to provide up to a 6-A output from an input voltage source of 2.95 V to 6 V. This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS54618 regulator. The switching frequency is externally set at a nominal 1000 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54618 package along with the gate drive circuitry. The low drain-to-source on-resistance of the MOSFETs allows the TPS54618 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are external to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54618 provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 7 V for the TPS54618EVM-606.

TPS54618EVM-606评估模块主要指标:


图3.TPS54618EVM-606评估模块电路图
TPS54618EVM-606评估模块材料清单(BOM):