LM61440AANRJRR - 4A Low-EMI Buck Converter | Texas Instruments
料号： LM61440AANRJRR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.9706 | $2.97 |
| 10 | $2.9706 | $29.71 |
| 100 | $2.9706 | $297.06 |
| 500 | $2.9706 | $1,485.30 |
| 1,000 | $2.9706 | $2,970.60 |
LM61440AANRJRR 概述
直接替换替代料： LM61440AANRJRR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM61440AANRJRR （相同外形与封装尺寸） ——差异在于 Dropout Behavior, Input Voltage Range, Output Voltage, Package, Topology.
快速对比工具——选择替代料号进行并排对比：
LM61440AANRJRR
✅ 直接替换✓ 有现货
$2.9706 / 个
查看数据手册 →LM61440AASQRJRRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LM61440AANRJRR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.9706 / 个
查看数据手册 →LM61440AASRJRR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM61440AANRJ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM61440AANRJRR 最大额定值与电气特性
| 输入电压范围 | 3 V to 36 V |
| Transient Input Tolerance | 42 V |
| Output Current | 4 A |
| 输出电压 | 1 V minimum, adjustable |
| 开关频率 | 2.2 MHz |
| 拓扑 | Synchronous step-down converter |
| Integrated Power Devices | Integrated high-side and low-side MOSFETs |
| Dropout Behavior | Soft recovery from dropout |
| 输出配置 | Positive, adjustable, single output |
| EMI | Low-EMI design |
| 工作结温 | -40 °C to +150 °C |
| 封装 | 14-pin PowerVQFN |
| 安装类型 | Surface mount |
| Application | Low-EMI low-noise power conversion |
| Exposed Thermal Pad | Present in PowerVQFN package |
LM61440AANRJRR 14-pin powervqfn 引脚配置指南
LM61440AANRJRR（14-pin powervqfn 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LM61440AANRJRR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM61440AANRJRR 适用于 8 应用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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LM61440AANRJRR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM61440AANRJRR | LM61440AASQRJRRQ1 | LM61440AANRJRR | LM61440AASRJRR | LM61440AANRJ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
关键差异点
- Wide input range with transient tolerance （对比 Typical lower-voltage buck converters)
- Integrated synchronous power stage （对比 Discrete MOSFET buck designs)
- Compact high-frequency conversion （对比 Lower-frequency high-current regulators)
- Low-EMI design focus （对比 Standard switching regulators without explicit low-EMI optimization)
设计说明
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.
合规信息
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.
