LM2672M-5.0/NOPB - 1A, 40V Step-Down Switching Regulator | TI
料号： LM2672M-5.0/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.82 | $1,820.00 |
LM2672M-5.0/NOPB 概述
A buck (step-down) switching regulator is a power management IC that converts a higher DC input voltage to a lower DC output voltage by rapidly switching an internal MOSFET and smoothing the resulting pulsed waveform through an LC low-pass filter. Compared with linear regulators, buck converters achieve far higher efficiency (typically 85-95% versus 30-60% for an LDO at large VIN-VOUT deltas) because they recycle energy through an inductor instead of burning it as heat. Within the broader taxonomy, buck regulators sit under DC-DC converters -> voltage regulators -> power management ICs -> semiconductors, and they remain the dominant topology whenever a regulated lower voltage must be derived from a battery, 12V/24V rail, or USB bus.
The LM2672M-5.0/NOPB delivers a fixed 5V output at up to 1A, features internal frequency compensation, and includes cycle-by-cycle current limiting plus thermal shutdown. The 260 kHz fixed switching frequency permits the use of small surface-mount inductors and ceramic output capacitors, enabling compact PCB layouts. A wide 8V-40V input range makes the part tolerant of automotive load-dump transients and industrial 24V bus rails. The internal high-side DMOS switch is rated for the full 40V input without external protection, simplifying the BOM to typically just an inductor, two capacitors, a diode, and four feedback resistors are unnecessary because the 5V version is factory-trimmed.
Typical applications include distributed 5V supply rails from a 12V or 24V system bus, point-of-load regulation after a front-end converter, automotive body electronics powered directly from the battery (with load-dump protection upstream), industrial sensor and actuator supplies, and battery-powered instruments requiring high step-down efficiency. Design considerations include choosing an inductor with adequate saturation current (typically >1.3A) and low DCR for best efficiency, and selecting a Schottky catch diode with reverse voltage greater than VIN(MAX). Output ripple depends on the LC filter; the manufacturer datasheet recommends a 100 uH to 470 uH inductor with low-ESR ceramic or low-ESR tantalum output capacitors. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： LM2672M-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。
本系列中的变体
可与以下型号直接替换的同系列型号： LM2672M-5.0/NOPB （相同外形与封装尺寸） ——差异在于 Output Voltage, Package, Switching Frequency, Topology.
快速对比工具——选择替代料号进行并排对比：
LM2672M-ADJ/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2675M-5.0/NOPB
✅ 直接替换✓ 有现货
$1.81 / 个
查看数据手册 →LM2674M-ADJ/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2591HVS-5.0/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2594HVM-5.0/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2675M-5.0
✅ 直接替换📋 参考替代料（不在目录中）
LM2672M-5.0/NOPB 最大额定值与电气特性
| 拓扑 | Buck (Step-Down) |
| 输出类型 | Fixed |
| 输出电压 | 5 V |
| Input Voltage Range (Min) | 8 V |
| Input Voltage Range (Max) | 40 V |
| 最大输出电流 | 1 A |
| 开关频率 | 260 kHz |
| 输出数量 | 1 |
| 同步整流器 | No (external Schottky required) |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 8-SOIC (0.154 inch / 3.90 mm width) |
| 安装类型 | Surface Mount |
| 引脚数量 | 8 |
| Lead-Free Finish | Yes (NOPB suffix, matte tin) |
| RoHS 状态 | Compliant |
| AEC-Q100 Qualified | No (standard grade) |
LM2672M-5.0/NOPB 引脚配置
| 引脚 1 | VIN — Switch input supply (8V to 40V) |
| 引脚 2 | SW — Switch node - inductor connection |
| 引脚 3 | BOOST — Bootstrap capacitor for gate drive |
| 引脚 4 | GND — Ground reference |
| 引脚 5 | FB — Feedback (NC on fixed 5V version per datasheet) |
| 引脚 6 | COMP — Compensation network |
| 引脚 7 | EN — Enable (active-high, tie to VIN if unused) |
| 引脚 8 | VIN — Input supply (tied to pin 1 internally) |
典型应用
LM2672M-5.0/NOPB 适用于 6 应用s: Industrial 24V to 5V Power Rail, Automotive Body Electronics 12V Battery Rail, Distributed 5V Rail from 12V/24V System Bus, Battery-Powered Portable Instrument Supply, USB-Powered Device with Wide VIN Range, Sensor and Actuator Distributed Power Module.
Industrial 24V to 5V Power Rail
The LM2672M-5.0/NOPB is widely used as a point-of-load 5V regulator on factory automation PLCs powered by a 24V industrial bus. Its 8V-40V input range accommodates 24V nominal with margin for transients and brown-out events, while the fixed 5V output eliminates feedback-resistor calibration. With 82-88% efficiency at 1A load, it keeps dissipation under 1.2W; the 8-SOIC footprint needs about 100 mm^2 of copper pour to keep junction below 125C. The 260 kHz switching frequency permits a small 100 uH surface-mount inductor, enabling a compact POL module. A Schottky catch diode (e.g., SS34) and 22 uF/100 uF input/output ceramic capacitors complete the BOM with under 6 external parts.
推荐
Automotive Body Electronics 12V Battery Rail
The LM2672M-5.0/NOPB is suitable for 12V automotive body-electronics subsystems such as infotainment controllers, instrument clusters, and lighting modules. The 40V maximum input withstands load-dump transients when paired with a TVS diode upstream, while the 8V minimum handles cold-crank dips. The fixed 5V output powers MCU cores and sensor ICs directly without external resistor dividers. Note that this part is not AEC-Q100 qualified; automotive programs requiring full qualification should use a TI -Q1 equivalent or LM2672-Q1 derivative. For ISO-7637-2 compliance, add a bidirectional TVS (e.g., SMAJ33CA) on the input.
推荐
Distributed 5V Rail from 12V/24V System Bus
In multi-rail systems, the LM2672M-5.0/NOPB delivers a regulated 5V output for downstream LDOs, MCUs, and analog circuits fed from a shared 12V or 24V bus. The high efficiency (85-90%) reduces thermal stress versus a 5V LDO from 12V, which would dissipate 7W at 1A. The wide VIN range lets the same BOM serve both 12V and 24V systems, simplifying inventory across SKUs. The 260 kHz switching frequency and small SO-8 footprint enable placement near the load, minimizing PCB trace losses. A simple RC snubber across the Schottky catch diode suppresses ringing at the switch node.
推荐
Battery-Powered Portable Instrument Supply
Battery-powered test instruments and portable diagnostic equipment benefit from the LM2672M-5.0/NOPB's ability to step down from multi-cell lithium packs (12.6V max for 3S) to a clean 5V rail for logic and analog sections. The fixed 5V output and 1A capacity support USB host ports, displays, and analog front ends. Efficiency at light loads (around 80% at 50 mA) extends battery runtime versus LDOs that would burn energy across the dropout. To maximize efficiency at low loads, the EN pin can be duty-cycled to enter micropower shutdown (typical IQ < 50 uA).
推荐
USB-Powered Device with Wide VIN Range
Although USB nominal 5V is below the LM2672M-5.0/NOPB's 8V minimum, the part excels when paired with a USB-PD trigger that requests 12V or 15V profiles. Step-down to 5V/1A from a 15V PD source yields 90%+ efficiency and clean regulation for downstream logic. The 8-SOIC footprint fits compact dongles and hub designs. The wide 40V tolerance also protects against miswired adapters and DC barrel-jack polarity reversals when paired with a P-FET reverse-protection block.
推荐
Sensor and Actuator Distributed Power Module
In factory-floor sensor hubs and motor-control daughterboards, the LM2672M-5.0/NOPB provides an isolated 5V rail from a 24V/36V backplane to power analog sensors, op-amps, and small signal relays. The 1A continuous current supports multi-sensor bundles without intermediate LDOs. Low-output ripple (typically <50 mVpp) keeps sensitive analog front ends (e.g., strain-gauge or RTD signal conditioning) noise-free. The 8-SOIC package plus 4 external components yields a sub-200 mm^2 POL module, ideal for backplane-card edge placement.
推荐
推荐产品汇总
工程参考数据： LM2672M-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 | LM2672M-ADJ/NOPB | LM2675M-5.0/NOPB | LM2674M-ADJ/NOPB | LM2591HVS-5.0/NOPB | LM2594HVM-5.0/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (3.90 mm) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Output Voltage | 5 V (Fixed) | 1.21 V to 37 V (ADJ) | 5 V (Fixed) | 1.21 V to 37 V (ADJ) | 5 V (Fixed) | 5 V (Fixed) |
| Maximum Output Current | 1 A | 1 A | 1 A | 0.5 A | 1 A | 0.5 A |
| Input Voltage Range | 8 V to 40 V | 8 V to 40 V | 8 V to 40 V | 8 V to 40 V | 4.5 V to 30 V | 4.5 V to 60 V |
| Switching Frequency | 260 kHz | 260 kHz | 150 kHz | 260 kHz | 150 kHz | 150 kHz |
| Lead-Free / RoHS | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant |
| Unit Price (qty-1, approx) | $2.85 | $2.85 | $3.10 | $2.70 | $2.95 | $2.50 |
关键差异点
- Factory-trimmed fixed 5V output eliminates feedback resistors （对比 LM2672M-ADJ/NOPB)
- 260 kHz switching permits smaller inductors than LM2675/LM2591 （对比 LM2591HVS-5.0/NOPB)
- 40V maximum input supports 24V industrial bus with margin （对比 LM2594HVM-5.0/NOPB)
设计说明
Estimated: At VIN=24V, VOUT=5V, IOUT=1A, the LM2672M-5.0/NOPB dissipates approximately (24V-5V)*1A*(1-efficiency) of power. With typical efficiency of 85% at this operating point, internal dissipation is about 2.8W. The 8-SOIC package has theta_JA of approximately 105 C/W on a 100 mm^2 copper pour; junction temperature rise above 25C ambient is roughly 105 * 2.8 = 294C above target, exceeding the 125C absolute maximum. Designers must either reduce VIN, lower load, or upgrade to a larger package (LM2675 in TO-220).
Place the input ceramic capacitor (>=22 uF low-ESR) within 5 mm of pin 1 (VIN) to minimize switching-loop inductance. The Schottky catch diode should be placed adjacent to the SW pin (pin 2) and ground return with wide short traces. Keep the inductor and output capacitor trace lengths short to reduce radiated EMI. Per TI SIMPLE SWITCHER PCB guidelines, use a single ground plane with star-ground tie near the IC GND pin (pin 4).
Do not omit the BOOST capacitor (typically 0.1 uF) between pins 3 and 2 - without it the high-side DMOS gate drive under-shoots and efficiency drops by 5-10%. The EN pin (pin 7) should not be left floating; tie it to VIN through a 100 kohm resistor or directly. Avoid using the ADJ version pinout (with feedback resistors) on the fixed 5V part - pin 5 (FB) must be left open on the fixed version. Reverse-battery protection requires an external P-FET; the LM2672M-5.0/NOPB itself is not reverse-polarity tolerant.
合规信息
Lead-free matte-tin finish per NOPB suffix. RoHS compliant per TI product page. Not AEC-Q100 qualified; use TI -Q1 variants for automotive. Conflict-minerals reporting compliant per TI policy.
