LM22675MRX-5.0/NOPB - 1A 42V SIMPLE SWITCHER Buck | 5V Fixed
料号： LM22675MRX-5.0/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.8 | $2.80 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.62 | $1,620.00 |
LM22675MRX-5.0/NOPB 概述
A buck (step-down) DC-DC switching converter is a switched-mode power supply topology that uses an inductor, output capacitor, and a high-frequency switching element to convert a higher DC input voltage to a lower DC output voltage at high efficiency (typically 90% or better). Within the broader power-management hierarchy, a buck converter sits under DC-DC converters, then under voltage regulators, then under power management ICs, and finally under semiconductors. SIMPLE SWITCHER is TI's family of easy-to-use, internally-compensated synchronous and non-synchronous buck regulators aimed at simplifying the design of point-of-load supplies.
The LM22675 integrates a 0.15 ohm N-channel high-side MOSFET, supports duty cycles up to 90%, and includes internal cycle-by-cycle current limiting, thermal shutdown, and an under-voltage lockout. The fixed 5.0 V output option (this variant) eliminates the external feedback divider, simplifying BOM and PCB area. Its 4.5 V to 42 V input range comfortably handles 12 V, 24 V, and 36 V industrial bus transients, making it well suited to industrial, automotive aftermarket, and telecom point-of-load applications.
Typical applications include 24 V industrial sensor and actuator power rails, factory automation I/O modules, telecom base-station auxiliary supplies, automotive body electronics (non-safety), battery-powered systems with wide input range, and any point-of-load regulation from a 12 V or 24 V bus down to a local 5 V rail for microcontrollers, FPGAs, or interface ICs.
When designing with this device, place the input ceramic bypass capacitor as close as possible to the VIN and GND pads, and ensure the PowerPAD is soldered to a sufficiently large copper pour (at least 1 square inch) to keep the junction temperature within safe limits at full 1 A load. The fixed 5.0 V version cannot be reconfigured to other output voltages - choose the LM22675MRX-ADJ/NOPB variant if a non-5 V output is required.
This page synthesizes current distributor pricing, parametric drop-in alternatives, and practical design guidance for the LM22675MRX-5.0/NOPB into a single reference not found in the manufacturer datasheet alone.
直接替换替代料： LM22675MRX-5.0/NOPB ——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：
该产品暂无直接替换替代料。
请求替代料LM22675MRX-5.0/NOPB 最大额定值与电气特性
| 拓扑 | Step-Down (Buck) |
| 输入电压范围 | 4.5 V to 42 V |
| 输出电压 | 5.0 V (Fixed) |
| Output Current | 1 A |
| 开关频率 | 500 kHz (typ) |
| Control Method | Voltage-Mode PWM |
| Integrated Switch | Yes (N-channel high-side MOSFET) |
| On-Resistance (High-Side) | 0.15 ohm (typ) |
| 同步整流器 | No (non-synchronous, external diode) |
| 输出数量 | 1 |
| 使能引脚 | Yes (precision enable) |
| 工作温度范围 | -40 C to +125 C (junction) |
| 封装 | 8-Pin HSOIC (DDA) PowerPAD, 3.90 mm body width |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free Finish | Yes (NOPB suffix) |
LM22675MRX-5.0/NOPB 引脚配置
| 引脚 1 | BST — Boost capacitor connection for the high-side gate drive |
| 引脚 2 | VIN — Input supply voltage (4.5 V to 42 V) |
| 引脚 3 | EN — Precision enable input (logic-high to enable, logic-low to shutdown) |
| 引脚 4 | RT/SS — Resistor-timing / soft-start pin |
| 引脚 5 | GND — Ground (and PowerPAD thermal pad) |
| 引脚 6 | VCC — Internal regulator bypass (LDO output for internal supply) |
| 引脚 7 | FB — Feedback (fixed 5.0 V variant: internal resistor divider; no external resistors required) |
| 引脚 8 | SW — Switch node (connects to external inductor and catch diode) |
典型应用
LM22675MRX-5.0/NOPB 适用于 6 应用s: 24 V Industrial Sensor and Actuator Power Rail, Factory Automation I/O Module 5 V Supply, Telecom Base-Station Auxiliary 5 V Rail, Automotive Body Electronics 5 V Rail (Non-Safety), Battery-Powered Portable Equipment with Wide Input Range, Point-of-Load 5 V Supply for FPGA or MCU Core.
24 V Industrial Sensor and Actuator Power Rail
The LM22675MRX-5.0/NOPB is well matched to 24 V industrial sensor and actuator rails because its 4.5 V to 42 V input range handles the full industrial bus swing plus transients, while the fixed 5.0 V output directly drives 5 V digital logic and microcontroller I/O. At a typical load of 0.5 to 1.0 A per node, the 500 kHz switching frequency keeps the LC filter footprint small enough to fit inside a sensor housing. Compared with an LDO, the buck topology dissipates far less heat at VIN=24 V/VOUT=5 V (about 2.4 W at 1 A vs 19 W), allowing sealed IP65/IP67 enclosures without thermal derating. Per the TI LM22675 datasheet, the precision enable pin allows sequencing of multiple rails in a process-control module.
推荐
Factory Automation I/O Module 5 V Supply
In a factory-automation I/O module the LM22675MRX-5.0/NOPB converts a 24 V backplane rail to a clean 5 V/1 A supply that powers a microcontroller, opto-isolated drivers, and status LEDs. The 0.15 ohm integrated high-side MOSFET and 500 kHz switching frequency minimize external part count, while internal cycle-by-cycle current limit and thermal shutdown protect the module against field-wiring shorts. The wide input range tolerates the under-voltage and over-voltage events common on long 24 V cable runs. Per the TI datasheet, the PowerPAD exposed pad provides a low-thermal-resistance path suitable for the cramped I/O-module form factor.
推荐
Telecom Base-Station Auxiliary 5 V Rail
The LM22675MRX-5.0/NOPB serves telecom base-station auxiliary boards where -48 V is typically stepped down by an intermediate converter to a 12 V or 24 V distribution rail, then locally regulated to 5 V for housekeeping logic. The buck topology delivers 5 V at 1 A with high efficiency across the 4.5 V to 42 V input range, keeping the local thermal envelope small. The non-synchronous topology requires only a single external Schottky diode, which is preferable to synchronous rectifiers in high-voltage-input telecom designs for BOM simplicity. Per the TI datasheet, the precision enable pin supports hot-swap insertion sequencing.
推荐
Automotive Body Electronics 5 V Rail (Non-Safety)
For non-safety automotive body electronics (e.g., interior lighting controllers, seat-control modules, rear-view camera interfaces), the LM22675MRX-5.0/NOPB converts a 12 V battery rail to 5 V at 1 A. The 4.5 V to 42 V input range handles load-dump transients up to 42 V and cold-crank under-voltage events down to 4.5 V without dropping out. For designs that require formal AEC-Q100, the TI LM22675QMR-5.0/NOPB is the automotive-qualified drop-in replacement. Per TI's product page, the device's -40 C to +125 C junction range covers automotive underhood and cabin environments.
推荐
Battery-Powered Portable Equipment with Wide Input Range
Portable and battery-backed equipment that must accept a range of input sources (USB 5 V, 1S/2S Li-Ion up to 8.4V, 12 V adapter, and 24 V industrial bus) can use the LM22675MRX-5.0/NOPB to produce a regulated 5 V rail for downstream point-of-load converters and microcontrollers. The 4.5 V to 42 V input comfortably covers 1S Li-Ion charge termination, 2S full charge, and 24 V hot-plug transients. The 500 kHz switching frequency and integrated high-side MOSFET minimize external BOM, ideal for compact portable form factors. Per TI, the low standby current achieved via the precision EN pin preserves battery life when the host system sleeps.
推荐
Point-of-Load 5 V Supply for FPGA or MCU Core
When a system board distributes a 12 V or 24 V intermediate bus and a downstream MCU, DSP, or low-power FPGA requires a clean 5 V supply, the LM22675MRX-5.0/NOPB provides an efficient point-of-load step-down. The fixed 5.0 V output eliminates the feedback resistor divider, reducing BOM and PCB area. The 500 kHz switching frequency sits well above the bandwidth of most MCU and FPGA power-rail sensitivity, and the wide input voltage allows direct tie to a 12 V or 24 V rail. Per the TI LM22675 datasheet, the device is internally compensated, removing the need for external compensation components.
推荐
推荐产品汇总
工程参考数据： LM22675MRX-5.0/NOPB ——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 | LM22675MRX-ADJ/NOPB | LM22675QMR-5.0/NOPB | LM22675MRE-5.0/NOPB | LM22672MRX-5.0/NOPB |
|---|---|---|---|---|---|
| Package | 8-pin HSOIC (DDA) PowerPAD | 8-pin HSOIC (DDA) PowerPAD - same | 8-pin HSOIC (DDA) PowerPAD - same | 8-pin HSOIC (DDA) PowerPAD - same | 8-pin HSOIC (DDA) PowerPAD - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 5.0 V (fixed) | Adjustable (1.285 V to 5.0 V typical, depends on external divider) | 5.0 V (fixed) | 5.0 V (fixed) | 5.0 V (fixed) |
| Output Current | 1 A | 1 A | 1 A | 1 A | 1 A |
| Input Voltage Range | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V |
| Automotive Grade (AEC-Q100) | No | No | Yes (Q1 suffix) | No | No (Q1 variant exists separately) |
| Packaging Format | Tape & Reel (MRX) | Tape & Reel (MRX) | Tape & Reel (QMRX) | Tube (MRE) | Tape & Reel (MRX) |
关键差异点
- Fixed 5.0 V factory-trimmed output （对比 LM22675MRX-ADJ/NOPB)
- Wide 4.5 V to 42 V input range （对比 LM22672MRX-5.0/NOPB)
- Integrated 0.15 ohm N-channel MOSFET （对比 LM2674MX-5.0/NOPB)
- Non-synchronous topology with external Schottky （对比 Synchronous buck converters (e.g., LM26420))
设计说明
Estimated: At VIN=24 V, VOUT=5.0 V, IOUT=1 A, and approximately 90% efficiency, the LM22675MRX-5.0/NOPB dissipates roughly (VIN-VOUT)*IOUT*(1-eta) + small conduction losses = approximately 2.1 W to 2.5 W. The HSOIC-8 PowerPAD exposed pad provides a low thermal-resistance path to the PCB. To keep the junction temperature below +125 C at +85 C ambient, solder the PowerPAD to at least 1 square inch (645 mm^2) of 2 oz copper pour on both top and inner PCB layers with thermal vias. Without this copper area the device will derate or shut down on thermal protection at full load.
Place the input ceramic bypass capacitor (minimum 1 uF X7R, 50 V rating recommended for 42 V surge tolerance) within 2 mm of the VIN and GND pins. Keep the SW-node trace short and isolated from sensitive analog traces; the SW node has high dv/dt and can couple into feedback traces. Use a 4-layer PCB with a continuous ground plane for best EMI performance, and route the FB trace (fixed 5.0 V variant has internal divider, but keep the SW-to-inductor loop area minimal). Place the external Schottky catch diode close to the SW and GND pins to minimize parasitic inductance.
Use a single-point (star) ground topology that ties the input capacitor ground, output capacitor ground, and PowerPAD ground together at the IC GND pin. This prevents high di/dt currents from the SW loop from corrupting the analog reference and FB node. The BST pin bootstrap capacitor (typically 0.1 uF) must be placed between BST and SW with the shortest possible traces; a long BST trace will cause excessive ringing and reduce high-side drive, leading to efficiency loss. The RT/SS pin resistor and capacitor (when used for soft-start) should be returned to a clean analog ground.
Do not confuse the fixed 5.0 V variant (LM22675MRX-5.0/NOPB) with the adjustable variant (LM22675MRX-ADJ/NOPB). The pinouts are identical but the feedback network on the FB pin differs - if the FB pin is forced externally on the fixed variant it can damage the internal divider. Also note that at light loads (below approximately 50 mA), the converter may operate in discontinuous conduction mode (DCM) with slightly higher output ripple; if your downstream circuit is sensitive to sub-100 mA loads, add a minimum preload. The enable pin is a precision input with a specific threshold - do not leave it open; tie it to VIN through a 100 kohm resistor or drive it with a logic signal.
合规信息
NOPB suffix indicates lead-free, RoHS-compliant finish per TI's product page. Not AEC-Q100 qualified - use LM22675QMR-5.0/NOPB (Q1 suffix) for AEC-Q100 automotive applications. Halogen-free status not explicitly confirmed in distributor data.
