LM2596SX-ADJ/NOPB-Q1 - 3A 150kHz Buck Regulator | TI
料号： LM2596SX-ADJ/NOPB-Q1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.89 | $18.90 |
| 100 | $1.55 | $155.00 |
| 500 | $1.25 | $625.00 |
| 1,000 | $1.02 | $1,020.00 |
LM2596SX-ADJ/NOPB-Q1 概述
A buck (step-down) switching regulator is a type of DC-DC converter that uses a switching element, inductor, and diode to efficiently reduce a higher input voltage to a lower output voltage. Unlike linear regulators, buck converters achieve high efficiency (up to 92% per TI datasheet) by minimizing power lost as heat, making them the workhorse of power management IC hierarchies for industrial, automotive, and consumer systems.
Key features include 3A load capability with cycle-by-cycle current limiting, 150 kHz fixed-frequency operation that simplifies output filter design and keeps switching noise out of sensitive bands, a wide 4.5V to 40V input range tolerant of automotive load-dump transients, and a low 5 mA typical quiescent current. The adjustable version sets output via two external resistors (VOUT = 1.23V x (1 + R2/R1)).
Internally, the LM2596 uses a voltage-mode PWM controller driving an NPN power switch, with internal thermal shutdown and current-limit protection. The TO-263 (D2PAK) package with exposed tab provides low thermal resistance to the PCB, supporting full 3A operation over -40C to +125C junction temperature.
Typical applications include automotive auxiliary power rails, industrial 24V bus point-of-load conversion, and 5V/3.3V supplies for microcontrollers and logic. Note: verified distributor data confirms the standard LM2596SX-ADJ/NOPB; the -Q1 AEC-Q100 variant should be confirmed against TI ordering information for automotive builds.
Design tip: keep the input capacitor, catch diode, and inductor loops short and place the feedback divider close to the ADJ pin; use a low-ESR output capacitor and Schottky diode rated for peak switch current.
直接替换替代料： LM2596SX-ADJ/NOPB-Q1 ——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： LM2596SX-ADJ/NOPB-Q1 （相同外形与封装尺寸） ——差异在于 Operating Temperature, Output Voltage Range, Package, Protection Features, Switching Frequency.
快速对比工具——选择替代料号进行并排对比：
LM2596SX-ADJ/NOPB
✅ 直接替换✓ 有现货
$1.4 / 个
查看数据手册 →LM2596SX-12/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2596S-ADJ/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
XL2596-ADJ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM2596SX-ADJ/NOPB-Q1 最大额定值与电气特性
| 拓扑 | Step-Down (Buck) Switching Regulator |
| 输出类型 | Adjustable |
| 输出电压范围 | 1.23 V to 37 V |
| 输入电压范围 | 4.5 V to 40 V |
| 最大输出电流 | 3 A |
| 开关频率 | 150 kHz (fixed) |
| 基准电压 | 1.23 V |
| 工作温度 | -40C to +125C (TJ) |
| 封装 | TO-263-6, D2PAK (5 Leads + Tab), KTT |
| 安装类型 | Surface Mount |
| Protection Features | Current limit, thermal shutdown |
| 输出数量 | 1 |
| Polarity | Positive |
| RoHS 状态 | Compliant (NOPB) |
LM2596SX-ADJ/NOPB-Q1 引脚配置
| 引脚 1 | VIN — Positive input supply, 4.5V to 40V |
| 引脚 2 | Output (Switch) — Switching node to inductor and catch diode |
| 引脚 3 | Ground — Ground (also exposed tab) |
| 引脚 4 | Feedback (ADJ) — Feedback input, 1.23V reference; tie to divider for adjustable output |
| 引脚 5 | ON/OFF — TTL-compatible shutdown; ground or low for normal operation |
| 引脚 Tab | Ground (Tab) — Exposed tab connected to ground for thermal dissipation |
典型应用
LM2596SX-ADJ/NOPB-Q1 适用于 6 应用s: Automotive Auxiliary Power Rails, Industrial 24V Bus Point-of-Load Conversion, Microcontroller and Logic Board Supplies, Battery-Powered and Portable Equipment, LED Lighting Drivers and Fixture Power, Test Benches, Hobby, and Prototyping Supplies.
Automotive Auxiliary Power Rails
The LM2596 converts 12V/24V automotive battery rails to 5V or 3.3V for ECUs, infotainment, and sensor clusters. Its 40V input ceiling provides margin for load-dump and cranking transients, and the -Q1 grade supports automotive quality flows. Placed upstream of LDOs for noise-sensitive loads, it delivers bulk current at up to 3A with high efficiency, reducing heat in sealed enclosures. The fixed 150 kHz switching frequency keeps EMI out of the AM band when using spread filtering and short input loops. A Schottky catch diode and low-ESR output capacitor complete a four-component external BOM.
推荐
Industrial 24V Bus Point-of-Load Conversion
Industrial PLCs, motor drives, and instrumentation commonly distribute 24V, which the LM2596 steps down to 5V or 12V auxiliary rails. The wide 4.5V-40V input tolerates bus sag and surges, while cycle-by-cycle current limiting protects against shorts in long field wiring. At 3A output it powers relays, displays, and microcontroller boards directly. The TO-263 tab soldered to a ground pour dissipates switching losses without a heatsink at moderate loads, and the adjustable version lets one design cover multiple rail voltages by changing only the feedback divider resistors.
推荐
Microcontroller and Logic Board Supplies
Buck-derived 5V or 3.3V rails feed MCUs such as the TMS320F2800x and MSPM0 families. The LM2596's 150 kHz operation and low external component count make it a forgiving first switching design, and its 1.23V reference supports outputs down to logic levels. Output ripple of a few tens of millivolts with a 220 uF low-ESR capacitor is acceptable for digital loads, while analog sections should add an LDO post-regulator. The enable-free, fixed-frequency behavior simplifies power sequencing relative to controllers requiring external compensation design.
推荐
Battery-Powered and Portable Equipment
For 12V lead-acid or multi-cell lithium packs, the LM2596 regulates down to system rails with efficiency that extends battery runtime versus linear solutions. Its low component count suits hand-built and serviceable equipment, and thermal shutdown plus current limit protect against abuse. The 5 mA quiescent-class overhead means it is best for devices drawing hundreds of milliamps to amps, not ultra-low-power sleep designs - newer parts like the TPS62840 suit nanoamp standby. Output regulation remains stable across the discharge curve thanks to the wide input range.
推荐
LED Lighting Drivers and Fixture Power
The LM2596 regulates constant-voltage buses feeding LED strings through current-limiting circuitry in signage, architectural, and task lighting. Its 40V input handles 24V fixture supplies with margin, and 3A output supports multi-watt LED loads. Efficiency around 90% keeps fixture enclosures cool, extending LED and driver lifetime. Fixed-frequency operation avoids visible flicker and audible noise when paired with adequate output capacitance. For precise current regulation, pair the LM2596 voltage rail with a dedicated LED driver such as the LP8860-Q1 for dimming and fault diagnostics.
推荐
Test Benches, Hobby, and Prototyping Supplies
Because it needs only four external components, the LM2596 is the classic choice for DIY bench supplies, module boards, and prototype power stages. The adjustable version spans 1.23V-37V from a single design, and the TO-263 package is hand-solderable on adapter boards. Current limit and thermal shutdown make it forgiving of beginner wiring errors. Designers should still follow datasheet layout rules - short input capacitor loops and a solid ground - to avoid instability. When moving to production, the same schematic can be migrated to higher-efficiency TI bucks if size or efficiency demands it.
推荐
推荐产品汇总
工程参考数据： LM2596SX-ADJ/NOPB-Q1 ——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 | LM2596SX-ADJ/NOPB | LM2596SX-12/NOPB | LM2596S-ADJ/NOPB | XL2596-ADJ | TPS5450QDDARQ1 |
|---|---|---|---|---|---|---|
| Package | TO-263-5 (D2PAK, KTT) | TO-263-5 - same | TO-263-5 - same | TO-263-5 - same | TO-263-5 - same | SO-8 (DDA) - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | XLSEMI | Texas Instruments |
| Output Current | 3 A | 3 A | 3 A | 3 A | 3 A | 5 A |
| Output Voltage | Adjustable 1.23 V to 37 V | Adjustable 1.23 V to 37 V | Fixed 12 V | Adjustable 1.23 V to 37 V | Adjustable | Adjustable 0.8 V+ |
| Switching Frequency | 150 kHz | 150 kHz | 150 kHz | 150 kHz | 180 kHz | 500 kHz |
| Automotive Grade (Q1) | Yes (per -Q1 suffix; verify ordering PN) | No (standard grade) | No (standard grade) | No (standard grade) | No | Yes (AEC-Q100) |
| Output Type | Adjustable | Adjustable | Fixed | Adjustable | Adjustable | Adjustable |
关键差异点
- Only four external components required （对比 TPS5450QDDARQ1)
- Wider 40V input headroom in a 3A part （对比 XL2596-ADJ)
- Adjustable output covers 1.23V-37V from one design （对比 LM2596SX-12/NOPB)
设计说明
Keep the loop from VIN capacitor, the internal power switch, catch diode, and inductor as short and wide as possible - this high-di/dt loop dominates radiated EMI at 150 kHz harmonics. Solder the TO-263 exposed tab to at least 1 square inch of ground copper; the tab is the primary heat-removal path and the IC ground reference. Place the feedback divider close to the ADJ pin and route the sense trace away from the switch node and inductor to prevent offset errors.
Use a Schottky catch diode rated at least 1.2x the maximum input voltage and the full peak switch current (e.g., 40V-60V, 3A class such as SR340/SS34 types). The diode reverse recovery and forward drop directly set efficiency; standard silicon diodes cause significant losses and possible thermal runaway. Input capacitor should be a low-ESR electrolytic or ceramic combination sized for the RMS ripple current per TI datasheet LM2596 Figure tables.
The ON/OFF pin (pin 5) must be grounded or pulled low for normal operation - a floating pin can shut the regulator down. Do not exceed 40V input including transients. Note that verified distributor listings confirm the standard LM2596SX-ADJ/NOPB; if your BOM requires AEC-Q100 qualification, confirm the exact -Q1 ordering part number with TI before release, as ordering suffixes differ.
合规信息
NOPB suffix indicates lead-free/RoHS-compliant plating. -Q1 suffix denotes AEC-Q100 automotive qualification per TI naming; exact qualification level should be confirmed on TI.com product page.
