TI公司的LM604x0系列是3.8V-36V 3A和4A超小型同步降壓DC/DC轉換器.該器件容易使用,為工業應用提供業界最好的效率.LM60430提供多達3A負載電流,而LM60440則是業界最小的4A降壓轉換器.器件具有低EMI和開關噪音,滿足CISPR22 class 5標準,開關頻率400kHz和1MHz,輸出電壓從1V到24V,所有負載下的功率轉換高效率,峰值效率大于95%,10-mA, 12 VIN, 5 VOUT時的PFM效率為90%.工作結溫–40C 到 +150C.工作靜態電流25 μA.主要用在工業PC和CPU(PLC控制器),伺服驅動和AC驅動控制模塊和醫療與儀表應用.本文介紹了LM604x0系列主要特性,功能框圖,應用電路以及評估模塊LM60440AQEVM主要特性,電路圖,材料清單和PCB設計圖.

The LM604x0 regulator is an easy-to-use,synchronous, step-down DC/DC converter that

delivers best-in-class efficiency for rugged industrialapplications. The LM60430 drives up to 3-A of loadcurrent, and the LM60440 is industrys smallest 4Astep-down converter.

The LM604x0 is available in an ultra-miniature WQFNpackage with wettable flanks and a standard QFNpin-out with a thermal pad to enhance thermalperformance. This enhanced QFN package featuresextremely small parasitic inductance and resistance,

enabling very high efficiency while minimizing switchnode ringing and dramatically reducing EMI.

The LM604x0 uses peak-current-mode control toautomatically fold back frequency at light load toensure exceptional efficiency across the entire loadrange. The low power dissipation paired with athermally optimized QFN package enables a powerdense solution size. In addition the device requiresfew external components and has a pinout designedfor simple PCB layout. The small solution size andfeature set of the LM604x0 are designed to simplifyimplementation for a wide range of end equipment.

This device is also available in an AEC-Q100-qualified version.

LM604x0系列主要特性:

1• Functional Safety-Capable

– Documentation available to aid functionalsafety system design

• Low EMI and switching noise

– Meets CISPR22 class 5 standard

– Enhanced QFN package minimizes parasiticinductance and switch node ringing

• Configured for rugged industrial applications

– Standard QFN footprint: single large thermalpad and all pins accessible from perimeter

– Pin compatible variants:

– LM60440 (36 V, 4 A)

– LM60430 (36 V, 3 A)

– Junction temperature range –40C to +150C

– Frequency: 400 kHz, 1 MHz

– Output voltage range: 1 V to 24 V

• High efficiency power conversion at all loads

– Peak efficiency > 95%

– 90% PFM efficiency at 10-mA, 12 VIN, 5 VOUT

– Low operating quiescent current of 25 μA

• Create a custom design using the LM60440 withthe WEBENCH® Power Designer

LM604x0系列應用:

• Industrial PC and CPU (PLC controller)

• Servo drive and AC drive control module

• Medical and instrumentation applications

圖1.LM604x0系列功能框圖

圖2. LM604x0系列應用案例圖(400kHz)

評估模塊LM60440AQEVM

The Texas Instruments LM60440AQEVM evaluation module helps designers evaluate the operation andperformance of the LM60440-Q1 wide-input buck converters. The LM60440-Q1 is an easy-to-usesynchronous step-down DC/DC converter capable of driving up to 4.0 A of load current from an inputvoltage of up to 36 V. The LM60440AQEVM features an adjustable output voltage of 5 V and a switchingfrequency of 400 kHz. See the LMR60440-Q1 3.8-V to 36-V, 4-A Synchronous Step-down Voltage

Converter Data Sheet data sheets for additional features, detailed descriptions, and available options.

圖3.評估模塊LM60440AQEVM外形圖

圖4.評估模塊LM60440AQEVM電路圖

評估模塊LM60440AQEVM材料清單:

圖5.評估模塊LM60440AQEVM PCB設計圖:頂層

圖6.評估模塊LM60440AQEVM PCB設計圖:底層

圖7.評估模塊LM60440AQEVM PCB設計圖:頂層銅

圖8.評估模塊LM60440AQEVM PCB設計圖:中間層1

圖9.評估模塊LM60440AQEVM PCB設計圖:中間層2

圖10.評估模塊LM60440AQEVM PCB設計圖:底層銅