LM2574-5.0BWM - 5V 500mA SIMPLE SWITCHER Buck | Microchip
料号： LM2574-5.0BWM ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.0047 | $1.00 |
| 10 | $1.0047 | $10.05 |
| 100 | $0.95 | $95.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
| 3,000 | $0.65 | $1,950.00 |
LM2574-5.0BWM 概述
The LM2574 is a switching buck regulator, meaning it uses an energy-transfer topology rather than dissipating excess input energy as heat like a linear regulator. In a buck converter, the switch repeatedly connects the input to an inductor and then releases that inductor energy through a diode and output capacitor. The 52kHz oscillator balances component size, conversion efficiency, and switching behavior. This makes the LM2574 suitable for industrial, embedded, communications, and consumer power trees where the input rail is substantially higher than the required 5V output.
Key electrical features include a 5V fixed output, 500mA load capability, an 8V minimum input and 40V maximum input according to the Texas Instruments product page, and internal frequency compensation. The fixed output is specified with a guaranteed tolerance of up to 4% over specified input and load conditions. The ON/OFF pin provides shutdown control, while the internal design allows a compact implementation using four external components as highlighted in the product-page description. The wide-body package is suitable for conventional surface-mount assembly rather than through-hole DIP layouts.
Typical uses include regulated 5V rails in embedded systems, instrumentation, communications equipment, and low-power industrial controllers. The fixed 5V version is especially useful when the load does not require adjustable output and the design team prefers a direct, validated regulator configuration. Compared with a linear regulator, the switching approach can reduce power dissipation when the input-output voltage difference is large, although inductor ripple and switching-node transitions must still be considered in sensitive analog or RF circuits. External input, output, inductor, and catch-diode components remain essential for stable operation.
A key design consideration is component selection around the switching loop. The inductor must carry the required 500mA output current with suitable saturation margin, while the diode and capacitors should be placed close to the regulator pins to reduce switching-loop area and parasitic inductance. The enable pin should be driven with suitable logic levels and appropriate pull-up or pull-down behavior for the system power state. The 5V output is not a low-noise linear rail; filtering may be needed if sensitive analog loads share the same node. The datasheet should be consulted for exact absolute maximum ratings, thermal limits, recommended external values, and the complete BWM pin assignment.
This product page combines verified manufacturer-family information, distributor identifiers, application guidance, and engineering-oriented comparison points for LM2574-5.0BWM. It is intended to help engineers confirm package compatibility, output requirements, switching topology, and supply-chain availability before incorporating the regulator into a new design.
直接替换替代料： LM2574-5.0BWM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LM2574-5.0BWM
✅ 直接替换✓ 有现货
$0.65 / 个
查看数据手册 →LM2574-5.0BWN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM2574-5.0BWM
✅ 直接替换✓ 有现货
$0.65 / 个
查看数据手册 →LM2574-5.0BWM-T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM2574-5.0BWA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM2574-5.0BWM 最大额定值与电气特性
| 输出类型 | Fixed 5V positive step-down |
| 输出电压 | 5 V |
| 最大输出电流 | 500 mA |
| 输入电压范围 | 8 V to 40 V |
| 开关频率 | 52 kHz |
| 拓扑 | Buck switching regulator |
| Control Architecture | Voltage-mode switching regulator with internal frequency compensation |
| Shutdown Control | ON/OFF pin |
| Output Regulation Tolerance | Guaranteed to +4% under specified input and load conditions |
| External Component Count | 4 external components |
| 封装 | SOIC-14 wide-body, BWM |
| 安装类型 | Surface mount |
| RoHS 状态 | unknown |
| REACH Status | unknown |
LM2574-5.0BWM soic-14 wide-body, bwm 引脚配置指南
LM2574-5.0BWM（soic-14 wide-body, bwm 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： LM2574-5.0BWM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2574-5.0BWM 适用于 6 应用s: Embedded 5V Control Rail, Industrial Instrumentation Supply, Communications Equipment 5V Rail, Low-Power Sensor and Acquisition System, Battery-Charged Auxiliary Supply, Compact 5V Peripheral Supply.
Embedded 5V Control Rail
LM2574-5.0BWM fits embedded controller boards that receive a higher-voltage industrial or communications supply and require a regulated 5V rail. Its 500mA capability provides useful margin for digital logic, interface circuits, and low-power sensors, while the fixed output removes the feedback-divider design step. The 52kHz buck topology is appropriate when the input-output difference makes a linear regulator thermally inefficient. Place the input capacitor, switching diode, inductor, and output capacitor close to the regulator, and check ripple and startup behavior at the intended load.
推荐
Industrial Instrumentation Supply
The LM2574-5.0BWM is appropriate for instrumentation that accepts an 8V-to-40V source and needs a compact 5V supply for analog front ends, measurement circuits, or control electronics. Its documented line and load regulation and fixed 5V output support repeatable rail behavior. The wide input ceiling accommodates industrial buses after appropriate protection, but designers must validate surge and transient requirements separately. Use careful grounding and output filtering if analog signals share the regulator node.
推荐
Communications Equipment 5V Rail
In communications equipment, LM2574-5.0BWM can generate a local 5V rail from a higher-voltage line or system supply while limiting the continuous load to the regulator's 500mA capability. The 52kHz switching frequency and small external-component requirement support practical board-space-conscious designs. Ensure the switching node is kept away from sensitive RF or high-impedance analog traces, and use filtering if the 5V rail powers noise-sensitive circuits.
推荐
Low-Power Sensor and Acquisition System
LM2574-5.0BWM can supply the 5V rail used by sensor excitation, signal conditioning, or data-acquisition circuitry when the system starts from a higher-voltage source. The fixed output simplifies firmware-controlled power trees, and the ON/OFF control permits shutdown when the acquisition system is idle. Because this is a switching regulator rather than an ultra-low-noise linear regulator, verify sensor excitation accuracy and ADC reference noise requirements before sharing the output without additional filtering.
推荐
Battery-Charged Auxiliary Supply
For battery-derived systems with a boosted or protected intermediate rail, LM2574-5.0BWM can produce a stable 5V auxiliary output for controllers and loads that require more current than the battery source can provide directly. The buck topology is useful when the intermediate rail is reliably above 5V plus the regulator's practical headroom. Designers should verify startup behavior, battery transients, load-step response, and reverse-current paths. The ON/OFF pin can support controlled shutdown, but it does not replace a dedicated battery-protection circuit.
推荐
Compact 5V Peripheral Supply
LM2574-5.0BWM is useful for a compact peripheral or daughterboard that requires a local 5V rail from a 12V, 24V, or other higher-voltage supply. The fixed 5V configuration reduces component count and makes power sequencing easier to implement with the ON/OFF input. The 500mA rating should be checked against the peripheral's peak current, including startup and transient loads. A small output filter or post-regulator can help when sensitive analog or precision timing circuits require lower noise than the raw buck output.
推荐
推荐产品汇总
工程参考数据： LM2574-5.0BWM ——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 | LM2574-5.0BWN | LM2574-5.0BWM-T | LM2574-5.0BWA |
|---|---|---|---|---|
| Output Voltage | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed |
| Output Current | 500 mA | 500 mA family target | 500 mA family target | 500 mA family target |
| Input Voltage | 8 V to 40 V | 8 V to 40 V family target | 8 V to 40 V family target | 8 V to 40 V family target |
| Switching Frequency | 52 kHz | 52 kHz family target | 52 kHz family target | 52 kHz family target |
| Package | SOIC-14 (BWM) | SOIC-14 (BWM) | SOIC-14 (BWM) | SOIC-14 (BWM) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Topology | Buck switching regulator | Buck switching regulator | Buck switching regulator | Buck switching regulator |
| External Component Count | 4 external components | 4 external components family target | 4 external components family target | 4 external components family target |
关键差异点
- Fixed 5V output simplifies implementation （对比 LM2574-ADJ)
- BWM surface-mount package supports compact boards （对比 LM2574-5.0YN)
- 500mA output supports moderate embedded loads （对比 LM22678)
- Established LM2574 implementation ecosystem （对比 TPS560430)
设计说明
Calculate the expected dissipation and load current before layout. For a buck regulator, the inductor, catch diode, input capacitor, and output capacitor must be selected for the 500mA capability and the actual input-to-output conversion ratio. Use the manufacturer datasheet's recommended values and verify them against the required output ripple. A 5V fixed output still needs adequate input headroom; do not treat the 40V maximum input as usable regulation range for every load condition.
Keep the switching loop physically small by placing the input capacitor, regulator, diode, and inductor connections close together. Route the high-current switch node with short, wide traces and keep it away from feedback, analog, and communication traces. Place the output capacitor near the load return and use a quiet ground return path. Good loop-area control reduces parasitic inductance, ringing, and electromagnetic emissions.
Do not substitute LM2574-5.0YN for LM2574-5.0BWM without redesigning the PCB: the verified distributor data identifies the former as an 8-pin DIP and the latter as a 14-pin SOIC-14 BWM device. Also verify the exact ordering suffix before ordering, because temperature grade, tape-and-reel coding, and packaging can differ even when the electrical family is the same.
A switching regulator is not automatically a low-noise linear supply. If the 5V rail feeds precision ADC references, RF circuits, or audio analog stages, evaluate the output ripple and add filtering or a post-regulator if required. Conversely, avoid adding unnecessary filtering when the target load is digital and the priority is converter efficiency and component count.
合规信息
The supplied verified data confirms the product identity, electrical family, package, and distributor listings but does not provide a specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration.
