LMR14030SSQDDARQ1 - 40V, 3.5A Automotive Buck Converter | TI
料号： LMR14030SSQDDARQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.78 | $2.78 |
| 10 | $2.5 | $25.00 |
| 100 | $2.22 | $222.00 |
| 500 | $1.99 | $995.00 |
| 1,000 | $1.78 | $1,780.00 |
LMR14030SSQDDARQ1 概述
A buck converter (step-down switching regulator) is a switch-mode DC-DC topology that uses an inductor and capacitor energy transfer to produce a lower, regulated output voltage from a higher input rail. Compared with linear regulators, buck converters achieve much higher efficiency (typically >85%) at large VIN–VOUT deltas, while LDO-style regulators waste VIN–VOUT as heat. The LMR14030 belongs to the SIMPLE SWITCHER® family — a Texas Instruments line of easy-to-use, internally-compensated switching regulators that minimize external component count for industrial and automotive designs.
Key features include 40 µA IQ at no load (extending standby time in always-on automotive subsystems), 200 kHz–2.5 MHz switching frequency range (programmable via RT resistor, enabling optimization between efficiency and solution size), internal soft-start, cycle-by-cycle over-current protection, thermal shutdown, and frequency foldback at high duty cycle. The 8-pin SO PowerPAD package exposes a thermal pad that pulls θJA down to roughly 40 °C/W on a standard 4-layer JEDEC board, supporting 3.5 A continuous output without external heatsinking.
Typical applications include automotive infotainment, ADAS sensor power, body electronics (lighting, mirror, HVAC), industrial 24-V rail conditioning, and battery-powered point-of-load regulation. The wide 4-V to 40-V input range survives 36-V load-dump transients common in 12-V automotive systems. The 2.2-MHz switching frequency falls above the AM band, avoiding audible interference in audio subsystems.
When designing, choose the inductor based on the ripple-current trade-off (typically 20–40% of IOUT) and select the input/output ceramic capacitors with sufficient RMS current rating. The exposed pad must be soldered to a sufficient copper pour to keep junction temperature within the 150 °C thermal shutdown limit.
直接替换替代料： LMR14030SSQDDARQ1 ——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：
LMR14030SDDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR14030SSQDDAQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMR14020SSQDDARQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMR14050SSQDDARQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMR14030SQDDARQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMR14030SSQDDARQ1 最大额定值与电气特性
| 拓扑 | Buck (Step-Down) |
| 输入电压范围 | 4 V to 40 V |
| 输出电压范围 | 0.8 V to 28 V (adjustable) |
| Continuous Output Current | 3.5 A |
| 开关频率 | 2.2 MHz (typ, 200 kHz–2.5 MHz programmable) |
| 静态电流 | 40 µA (typ) |
| High-Side MOSFET RDS(on) | 76 mΩ (typ) |
| 工作温度范围 | -40 °C to +125 °C |
| 封装 | 8-SO PowerPAD (DDA / SO PowerPAD) |
| 安装类型 | Surface Mount |
| AEC-Q100 Qualification | Grade 1 (qualified, automotive) |
| RoHS 状态 | Compliant |
| Protection Features | OCP, thermal shutdown, frequency foldback, soft-start |
| Feedback Voltage Reference | 0.8 V (typ) |
LMR14030SSQDDARQ1 引脚配置
| 引脚 1 | BST — Bootstrap capacitor connection for high-side gate drive |
| 引脚 2 | VIN — Input supply voltage (4 V to 40 V) |
| 引脚 3 | EN — Enable input (active high, with internal pull-up) |
| 引脚 4 | RT/SS — Resistor for switching frequency setting and soft-start programming |
| 引脚 5 | FB — Feedback input for output voltage regulation (0.8 V reference) |
| 引脚 6 | COMP — Compensation network connection for control loop |
| 引脚 7 | GND — Analog ground (signal return) |
| 引脚 8 | SW — Switch node (connected to inductor and bootstrap diode) |
典型应用
LMR14030SSQDDARQ1 适用于 6 应用s: Automotive Infotainment Power Rails, ADAS Camera and Sensor Power, Industrial 24-V PLC and Sensor Conditioning, Body Electronics and Lighting Modules, Battery-Powered Portable Equipment, USB-PD and Multi-Rail Adapter Power.
Automotive Infotainment Power Rails
The LMR14030SSQDDARQ1's 4 V to 40 V input range, AEC-Q100 Grade 1 qualification, and 40 µA IQ make it ideal for automotive infotainment head units that must survive 12-V battery cold-crank and load-dump transients. The 2.2-MHz switching frequency sits above the AM broadcast band, eliminating audible interference in audio subsystems, while the 3.5-A output supplies multiple downstream rails (MCU core, audio codec, display backlight). Compared to a linear regulator, the buck topology dissipates far less heat at large VIN–VOUT deltas, enabling compact sealed enclosures without heatsinks.
推荐
ADAS Camera and Sensor Power
Advanced driver-assistance systems (ADAS) cameras and radar sensors require clean, low-noise 3.3 V or 5 V rails supplied directly from the 12 V automotive battery. The LMR14030SSQDDARQ1's integrated MOSFETs and 2.2-MHz switching minimize external component count on space-constrained sensor PCBs. The wide 4 V to 40 V input tolerates cranking dips and load dumps without UVLO triggering, while the 40 µA IQ preserves standby time when the vehicle is parked. AEC-Q100 Grade 1 qualification lets designers certify the full sensor module against automotive reliability standards.
推荐
Industrial 24-V PLC and Sensor Conditioning
Industrial programmable logic controllers (PLCs) and 24-V field sensors benefit from the LMR14030SSQDDARQ1's wide 4 V to 40 V input, which accepts 24-V nominal rails plus ±20% tolerance without pre-regulation. The 3.5-A continuous output powers multiple downstream point-of-load converters or directly drives relays, optocouplers, and analog front-ends. The 2.2-MHz switching frequency shrinks the LC filter footprint compared to 500-kHz alternatives, and the –40 °C to +125 °C operating range covers outdoor cabinet and factory-floor environments without derating.
推荐
Body Electronics and Lighting Modules
Automotive body controllers for LED headlamps, mirror modules, and HVAC actuators draw bursts of current from the 12 V battery, and the LMR14030SSQDDARQ1's 3.5-A output and 40-V transient tolerance handle these loads cleanly. The converter's internal soft-start prevents inrush current that could trip body-control fuses, while cycle-by-cycle current limit protects LED driver stages downstream. AEC-Q100 Grade 1 and the 8-SO PowerPAD's low θJA let designers place the IC next to thermal sources without additional heatsinking, simplifying module layout.
推荐
Battery-Powered Portable Equipment
Portable battery-powered equipment such as handheld test instruments, e-bike controllers, and industrial scanners benefit from the LMR14030SSQDDARQ1's 40 µA quiescent current, which extends standby time between recharges. The 2.2-MHz switching frequency enables small ceramic input/output capacitors and a sub-10-µH inductor, shrinking the total solution footprint to less than 100 mm². The wide 4 V to 40 V input accepts multi-cell lithium packs (up to 10S) or USB-PD adapters without pre-regulation, simplifying the power tree.
推荐
USB-PD and Multi-Rail Adapter Power
USB-PD adapters and multi-rail wall adapters benefit from the LMR14030SSQDDARQ1's 4 V to 40 V input range, which handles rectified 19-V to 32-V mains-rail voltages without pre-regulation. The 3.5-A continuous output delivers up to ~17 W at 5 V, enough to power downstream USB-PD controllers and protocol-handling ICs. The 2.2-MHz switching frequency avoids audible noise in transformer-coupled designs, and the 40 µA IQ meets stringent standby-power regulations such as EU Ecodesign for external power supplies.
推荐
推荐产品汇总
工程参考数据： LMR14030SSQDDARQ1 ——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 | LMR14030SDDAR | LMR14030SSQDDAQ1 | LMR14020SSQDDARQ1 | LMR14050SSQDDARQ1 | LMR14030SQDDARQ1 |
|---|---|---|---|---|---|---|
| Package | 8-SO PowerPAD (DDA) | 8-SO PowerPAD (DDA) - same | 8-SO PowerPAD (DDA) - same | 8-SO PowerPAD (DDA) - same | 8-SO PowerPAD (DDA) - same | 8-SO PowerPAD (DDA) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 3.5 A | 3.5 A | 3.5 A | 2 A | 5 A | 3.5 A |
| Input Voltage Range | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V |
| Switching Frequency | 2.2 MHz | 2.2 MHz | 2.2 MHz | 2.2 MHz | 2.2 MHz | 2.2 MHz |
| AEC-Q100 Qualified | Yes (Grade 1) | No | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) |
| Quiescent Current | 40 µA | 40 µA | 40 µA | 40 µA | 40 µA | 40 µA |
| Output Voltage Range | 0.8 V to 28 V | 0.8 V to 28 V | 0.8 V to 28 V | 0.8 V to 28 V | 0.8 V to 28 V | 0.8 V to 28 V |
关键差异点
- Automotive grade with same die as industrial version （对比 LMR14030SDDAR)
- Pin-compatible up/down scaling across the family （对比 LMR14020SSQDDARQ1 / LMR14050SSQDDARQ1)
- Above-AM-band switching frequency （对比 Lower-frequency automotive bucks (e.g., 500 kHz to 1 MHz))
设计说明
Estimated: at VIN = 24 V, VOUT = 5 V, and IOUT = 3.5 A, the LMR14030SSQDDARQ1 dissipates approximately (24 − 5) × 3.5 = 66.5 W of input power × (1 − 5/24) ≈ 52.6 W of loss. Real efficiency at this operating point is closer to ~90% per the datasheet efficiency curve, giving ~5.6 W internal dissipation. The 8-SO PowerPAD θJA of ~40 °C/W on a standard 4-layer JEDEC board yields a junction rise of ~225 °C — clearly above the 150 °C thermal shutdown limit. Derate VIN or current to keep dissipation under ~3 W without an external heatsink.
Place the input ceramic capacitor (≥ 4.7 µF X7R) as close as possible to the VIN and GND pins to minimize switching-current loop inductance. Keep the SW-node copper trace short and isolated from the FB trace to prevent noise coupling into the feedback path. The exposed pad must be soldered to a continuous ground copper pour with thermal vias (≥ 4 vias, 0.3 mm drill) to achieve the rated θJA. Avoid routing sensitive analog signals beneath the SW-node copper.
Do not exceed the 40-V absolute-maximum VIN — load-dump transients in 12-V automotive systems can briefly reach 35–40 V, leaving virtually no design margin. Always select the bootstrap capacitor (≥ 0.1 µF X7R) close to the BST and SW pins, or the high-side MOSFET will not turn on cleanly. The RT/SS pin doubles as the soft-start programming node — leaving it floating disables both frequency control and soft-start, which can cause inrush current to trip upstream fuses.
合规信息
AEC-Q100 Grade 1 qualified (–40 °C to +125 °C). RoHS and REACH compliant per TI product page. Choose the LMR14030SDDAR for non-automotive designs where AEC-Q100 is not required.
