LM61440AANRJRR - 4A Low-EMI Buck Converter | Texas Instruments
MPN： LM61440AANRJRR ✓ 啟用中LM61440AANRJRR 概覽
直接替換替代品，適用於 LM61440AANRJRR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM61440AANRJRR （相同外形與佔位） — 差異在於 Dropout Behavior, Input Voltage Range, Output Voltage, Package, Topology.
LM61440AANRJRR
✅ 直接替換聯絡詢價
查看資料表 →LM61440AASQRJRRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
LM61440AANRJRR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →LM61440AASRJRR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM61440AANRJ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM61440AANRJRR 最大額定值與電氣特性
| 輸入電壓範圍 | 3 V to 36 V |
| Transient Input Tolerance | 42 V |
| Output Current | 4 A |
| 輸出電壓 | 1 V minimum, adjustable |
| 切換頻率 | 2.2 MHz |
| 拓撲 | Synchronous step-down converter |
| Integrated Power Devices | Integrated high-side and low-side MOSFETs |
| Dropout Behavior | Soft recovery from dropout |
| 輸出配置 | Positive, adjustable, single output |
| EMI | Low-EMI design |
| 工作接面溫度 | -40 °C to +150 °C |
| 封裝 | 14-pin PowerVQFN |
| 安裝類型 | Surface mount |
| Application | Low-EMI low-noise power conversion |
| Exposed Thermal Pad | Present in PowerVQFN package |
LM61440AANRJRR 14-pin powervqfn 腳位配置指南
LM61440AANRJRR（14-pin powervqfn 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： LM61440AANRJRR.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM61440AANRJRR 適用於 8 應用s: Industrial 24 V Power Rail, Communications Equipment Power Supply, Audio and Analog Signal-Chain Supply, Embedded Computing and Processor Rail, Test and Measurement Front End, Battery-Powered and Portable Systems, LED and Display Backlight Systems, Automotive and Rugged Embedded Systems.
Industrial 24 V Power Rail
The LM61440AANRJRR is suitable for regulating a 24 V industrial input into a lower voltage rail for sensors, controllers, and communications equipment. Its 3 V to 36 V operating range covers the nominal bus, while the stated 42 V transient tolerance provides useful surge margin. With integrated high-side and low-side MOSFETs, the converter simplifies the power stage. The 4 A rating can support moderate loads, but the inductor, output capacitors, thermal design, and input protection must be selected for the actual transient profile.
推薦
Communications Equipment Power Supply
For communications equipment, the LM61440AANRJRR provides a compact synchronous step-down stage with adjustable output down to 1 V and up to 4 A of nominal output current. The integrated MOSFETs reduce external component count, while the 2.2 MHz switching frequency supports compact magnetics and capacitors. Its low-EMI architecture is useful when converter switching could interfere with nearby signal processing. Proper input filtering, ground-plane planning, and output-decoupling layout remain necessary for system-level EMI performance.
推薦
Audio and Analog Signal-Chain Supply
The LM61440AANRJRR can generate a local low-voltage rail for audio, ADC, DAC, or other analog signal-chain blocks. Its low-EMI synchronous architecture is intended to reduce switching-related interference, and the adjustable output allows the rail to be matched to the downstream device. Because DC-DC converters can still produce conducted and radiated emissions, place the input and output capacitors close to their pins and keep the high-current switching loop small. The final noise performance depends on layout, filtering, and the selected passives.
推薦
Embedded Computing and Processor Rail
The LM61440AANRJRR is suitable for intermediate processor, FPGA, or embedded-computing rails where the input bus is above the required core voltage. Its 3 V to 36 V input range supports common 5 V, 12 V, and 24 V distribution systems, while the adjustable output and 4 A capability provide flexibility for multiple loads. Designers should calculate voltage-drop and power loss across the inductor and PCB copper, and verify transient response against the processor load profile. The synchronous topology helps improve efficiency compared with a basic diode rectifier when operating conditions are suitable.
推薦
Test and Measurement Front End
The LM61440AANRJRR is appropriate for local rails in test and measurement equipment where compact conversion and controlled EMI are important. The 2.2 MHz switching frequency enables small passive components, and the integrated MOSFETs simplify the converter implementation. A low-noise supply helps preserve measurement integrity, but the regulator should still be paired with appropriate filtering and an analog-friendly reference point. Verify output ripple, load-transient response, and thermal performance under worst-case laboratory conditions before production.
推薦
Battery-Powered and Portable Systems
Although the LM61440AANRJRR is not a dedicated battery charger, it can regulate a suitable protected battery or system input into a lower rail for portable electronic equipment. Its wide input range supports multiple source voltages, and the adjustable output allows local rails to be tailored to processors, radios, or sensors. The 4 A capability is useful for compact compute loads, while the low-EMI design helps reduce interference in radio-adjacent equipment. Designers must add the required battery protection, load-sharing, and power-path circuitry; the converter alone does not provide complete battery management.
推薦
LED and Display Backlight Systems
The LM61440AANRJRR can serve as a buck-conversion stage in display backlight or LED systems when the input voltage and output requirements match its operating limits. The adjustable output down to 1 V provides flexibility for different LED-string and driver architectures, while the synchronous power stage can improve conversion efficiency. LED systems impose strict current regulation and transient requirements, so the LM61440 should be paired with a suitable LED driver or constant-current control stage. Confirm LED current limits, dimming behavior, and thermal margins in the complete design.
推薦
Automotive and Rugged Embedded Systems
The LM61440 family’s wide input range and low-EMI synchronous architecture can be useful in rugged embedded systems, although the exact LM61440AANRJRR ordering variant must be checked for automotive qualification before use in vehicle applications. The 42 V transient tolerance may help with protected input networks, but external protection and filtering are still required. For non-automotive industrial, robotics, or transportation equipment, the device can support compact intermediate rails with up to 4 A nominal output current when thermal and transient requirements are met.
推薦
推薦產品摘要
工程參考資料，適用於 LM61440AANRJRR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM61440AANRJRR | LM61440AASQRJRRQ1 | LM61440AANRJRR | LM61440AASRJRR | LM61440AANRJ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
主要差異化特點
- Wide input range with transient tolerance (對比Typical lower-voltage buck converters)
- Integrated synchronous power stage (對比Discrete MOSFET buck designs)
- Compact high-frequency conversion (對比Lower-frequency high-current regulators)
- Low-EMI design focus (對比Standard switching regulators without explicit low-EMI optimization)
設計說明
Place the input capacitor, high-side MOSFET, low-side MOSFET, inductor, and output capacitor in the smallest practical switching loop. The LM61440AANRJRR is designed for low-EMI operation, but layout still determines how much conducted and radiated noise reaches the system. Follow the TI datasheet power-layout guidance, provide a continuous ground path, and keep sensitive signal traces away from the switching node. The 14-pin PowerVQFN exposed pad must be connected according to the manufacturer layout requirements.
Calculate conduction and switching losses using the actual input voltage, output voltage, load current, switching frequency, and selected inductor. Estimated: with VIN = 24 V, VOUT = 5 V, and IOUT = 4 A, the ideal conversion difference is 19 V × 4 A = 76 W before efficiency losses, so this operating point requires substantial thermal analysis and is not appropriate without an appropriate inductor and board design. Use the TI thermal information and exposed-pad layout guidance, and measure junction temperature in the final assembly.
Validate the inductor current rating, saturation current, output capacitance, and feedback divider against the required 4 A load and output-voltage tolerance. The 1 V minimum adjustable output does not mean every external component value is interchangeable across designs. Use the LM61440 datasheet’s recommended compensation and compensation-network procedure, account for ESR and temperature variation, and verify startup behavior at the minimum and maximum input voltages. Confirm the device’s soft-recovery behavior in the complete load-step test.
合規資訊
The supplied verified web results identify the product and its electrical highlights but do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Automotive qualification must be checked for the exact ordering suffix.
