LMR36510FADDAR - 65V 1A Sync Buck Converter | Texas Instruments
料号： LMR36510FADDAR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.86 | $430.00 |
| 1,000 | $0.73 | $730.00 |
| 3,000 | $0.61 | $1,830.00 |
LMR36510FADDAR 概述
A buck converter (also called a step-down switching regulator) is a type of DC-DC converter that efficiently reduces a higher DC input voltage to a lower DC output voltage using a controlled switching element, an inductor, a capacitor, and a rectifier. Compared to linear regulators (LDOs), buck converters achieve substantially higher efficiency because power dissipation is minimized during switching transitions rather than being continuously burned off as heat. The LMR36510 belongs to the broader category of synchronous buck converters, meaning the rectifying diode is replaced by a second MOSFET to further reduce conduction losses and improve efficiency, especially at high currents and low duty cycles.
Key features include 26 uA quiescent current for standby energy compliance, integrated 65 V MOSFETs that eliminate external switches, a 70 V transient-tolerant input for surge immunity, and a peak current-mode control topology that simplifies loop compensation and provides cycle-by-cycle current limiting. The device also offers a PGOOD indicator output, an enable pin with wide-input UVLO threshold, and internal soft-start, all packed into an exposed-pad 8-pin PowerSOIC package that provides a low thermal resistance path for continuous 1 A operation.
The LMR36510 uses peak current-mode control with internal compensation, which provides stable operation across a wide range of input voltages, output voltages, and load currents without requiring external compensation components. The fixed switching frequency (400 kHz for the F variant) is set internally to keep the fundamental and harmonics out of sensitive AM-band frequencies. The integrated MOSFETs are rated for 65 V drain-to-source breakdown, giving substantial headroom over the 65 V maximum continuous input rating.
Typical applications include industrial sensor and PLC power supplies, building automation, 24-V industrial bus systems, battery-powered equipment, and low-power always-on consumer loads that need to survive 48-V telecom transient surges. The wide input range and 70-V transient capability also make it well suited for automotive load-dump scenarios where the input rail can momentarily exceed nominal battery voltage.
When designing with this device, note that the PowerSOIC exposed pad must be soldered to a sufficient ground-plane copper area to keep junction temperature within the 125 C limit. Use the WEBENCH Power Designer tool to evaluate loop stability, inductor ripple, and efficiency trade-offs for a given VIN/VOUT/IOUT combination.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides, helping engineers shortlist parts and reduce BOM risk.
直接替换替代料： LMR36510FADDAR ——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： LMR36510FADDAR （相同外形与封装尺寸） ——差异在于 Mounting Type, Operating Temperature Range, Package, Switching Frequency.
快速对比工具——选择替代料号进行并排对比：
LMR36510ADDAR
✅ 直接替换✓ 有现货
$0.88 / 个
查看数据手册 →LMR36520FADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36520ADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33610FADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33620FADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33630FADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36510FADDAR 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| Input Voltage Range (Continuous) | 4.2 V to 65 V |
| Transient Input Tolerance | 70 V |
| 最大输出电流 | 1 A |
| 静态电流 | 26 uA typical |
| 开关频率 | 400 kHz (F variant) |
| MOSFET Integration | High-side + Low-side (synchronous) |
| Control Mode | Peak Current Mode with internal compensation |
| 封装 | 8-Pin PowerSOIC (DDA), 0.154-inch (3.90 mm) body width |
| 安装类型 | Surface Mount, exposed thermal pad |
| 工作温度范围 | -40 C to +125 C junction |
| 使能引脚 | Yes (with wide-input UVLO threshold) |
| PGOOD Output | Yes (open-drain) |
| 软启动 | Internal |
| RoHS 状态 | Compliant |
LMR36510FADDAR 引脚配置
| 引脚 1 | VIN — Input voltage supply (4.2 V to 65 V) |
| 引脚 2 | EN/UVLO — Enable and undervoltage lockout input |
| 引脚 3 | RT/SS — Resistor timing and soft-start pin |
| 引脚 4 | FB — Feedback input (sets VOUT via resistor divider) |
| 引脚 5 | PGOOD — Power good indicator output (open drain) |
| 引脚 6 | AGND — Analog ground |
| 引脚 7 | SW — Switch node connection to external inductor |
| 引脚 8 | PGND — Power ground and exposed thermal pad |
典型应用
LMR36510FADDAR 适用于 7 应用s: 24-V Industrial Sensor and PLC Power Supply, Building Automation and HVAC Control, 48-V Telecom and PoE Auxiliary Rails, Automotive 12-V Body Electronics, Battery-Powered IoT and Always-On Loads, Industrial Sensor and Field Transmitter Bias, USB-PD and 5-V/12-V Adapter Output Stage.
24-V Industrial Sensor and PLC Power Supply
The LMR36510FADDAR fits 24-V industrial bus rails because its 4.2-65 V continuous input covers 24 V nominal with substantial surge headroom, and the 70-V transient tolerance rides out 24-V industrial surges per IEC 61000-4-2. Its 26-uA quiescent current enables standby power budgets for always-on PLC modules and remote I/O blocks, while the 1 A output handles sensor clusters, analog front ends, and isolated communication links. Place a 2.2 uH inductor, 2 x 22 uF ceramic input caps, and a single 47 uF output cap to achieve a sub-30 mm-square solution sized for DIN-rail enclosures.
推荐
Building Automation and HVAC Control
Building automation systems commonly run on 24 VAC rectified or 24 VDC rails with significant inductive transients; the LMR36510FADDAR's 70-V transient tolerance absorbs these events without external TVS protection in many designs. The 26-uA quiescent current extends battery life in wireless thermostats and CO2 sensors that spend most of their time in deep sleep. With 1 A of output current the part supports a complete HVAC controller board including MCU, radio module, and relay drivers, while the PowerSOIC exposed pad provides enough thermal headroom at 24-V to 3.3-V conversion.
推荐
48-V Telecom and PoE Auxiliary Rails
Telecom equipment often uses -48-V backplanes that can swing up to -60 V during ringing; the LMR36510FADDAR's 65-V continuous rating and 70-V transient tolerance cover these rails without requiring front-end protection in most designs. The integrated MOSFETs minimize BOM count, which is critical for compact PoE splitter and load-board designs. Per the TI datasheet, at 48-V to 5-V conversion and 1 A output, typical efficiency reaches 88-92%, keeping thermal rise within the PowerSOIC's dissipation budget even in sealed enclosures without fans.
推荐
Automotive 12-V Body Electronics
Automotive 12-V body modules experience load-dump transients up to 35 V; the LMR36510FADDAR's 70-V surge handling exceeds this requirement even with prolonged overvoltages. For automotive designs an AEC-Q100 variant like the LMR36510-Q1 may be preferred, but the standard FADDAR remains useful in non-safety body controllers, infotainment accessories, and aftermarket telematics where ruggedness against cranking transients is the priority. Its 400 kHz switching frequency (F variant) pushes fundamental and harmonics above the AM radio band, simplifying EMI filter design for AM-band-sensitive infotainment boards.
推荐
Battery-Powered IoT and Always-On Loads
In battery-powered IoT nodes the LMR36510FADDAR's 26-uA quiescent current is the headline specification: with the part enabled and no load, it draws less than a typical coin-cell self-discharge current, allowing year-long standby on 4 x AA cells. The 4.2-V minimum input covers LiFePO4 (3.2-V nominal) and 4 x NiMH (4.8-V nominal) battery stacks with a boost-from-dead-source requirement, while 65-V continuous lets the same board optionally run from 24-V mains with a single BOM. Energy harvesting applications such as industrial vibration harvesters also benefit from the wide input range, handling variable harvester outputs without re-design.
推荐
Industrial Sensor and Field Transmitter Bias
2-wire and 3-wire field transmitters (4-20 mA loops, HART modems) are typically biased from 24-V supply rails that can carry significant common-mode noise. The LMR36510FADDAR's wide VIN tolerance and 70-V transient handling allow direct rectification and regulation of these rails with minimum filtering. At 24-V input and 5-V/200-mA output (typical HART modem supply), efficiency exceeds 85% per TI datasheet curves, so the surface-mount SO Power package does not require a heatsink. Designers can add a TPS22965 load switch downstream for power gating between HART bursts.
推荐
USB-PD and 5-V/12-V Adapter Output Stage
After a USB-PD or 12-V AC adapter front end, a downstream synchronous buck is often required to generate 3.3-V or 5-V rails; the LMR36510FADDAR handles 4.2-65 V input which covers USB-PD 5/9/15/20-V and traditional 12-V adapters with a single design. Compared to a linear regulator at 12-V-to-3.3-V @ 1 A (which would dissipate 8.7 W), the LMR36510 typically wastes less than 1 W at the same load, eliminating the heatsink. The peak current-mode control maintains stable regulation across line and load steps required by USB-PD load-transient tests.
推荐
推荐产品汇总
工程参考数据： LMR36510FADDAR ——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 | LMR36510ADDAR | LMR36520FADDAR | LMR36520ADDAR | LMR33610FADDAR | LMR33620FADDAR | LMR33630FADDAR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-Pin PowerSOIC (DDA) | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same |
| Input Voltage (Continuous) | 4.2 V to 65 V | 4.2 V to 65 V | 4.2 V to 65 V | 4.2 V to 65 V | 3.8 V to 36 V | 3.8 V to 36 V | 3.8 V to 36 V |
| Transient Input Tolerance | 70 V | 70 V | 70 V | 70 V | 40 V | 40 V | 40 V |
| Maximum Output Current | 1 A | 1 A | 2 A | 2 A | 1 A | 2 A | 3 A |
| Switching Frequency (FSW) | 400 kHz | 1 MHz | 400 kHz | 1 MHz | 400 kHz | 400 kHz | 400 kHz |
| Automotive Grade (AEC-Q100) | No | No | No | No | No | No | No |
关键差异点
- Wide-Vin range up to 65 V continuous and 70 V transient （对比 LMR33610FADDAR)
- Ultra-low 26 uA quiescent current for standby compliance （对比 LMR36520FADDAR)
- 400 kHz FSW variant keeps noise out of the AM radio band （对比 LMR36510ADDAR)
设计说明
Estimated: At VIN=24 V, VOUT=5 V and 1 A load, the LMR36510FADDAR dissipates approximately (24-5)*1 = 19 W * (1 - 0.90 efficiency) roughly 1.9 W internal loss. With a PowerSOIC DDA on a 1-square-inch copper ground pour, theta-JA is approximately 35 C/W. Junction rise would be ~66 C above ambient, requiring either a larger copper area or forced airflow if the application sits above 60 C ambient. Always check TI's WebTHERM and application note SLVAEW8 for the precise thermal model of your specific board layout.
Place the input ceramic capacitors (typically 2 x 22 uF) as close as possible to the VIN and PGND pins using wide, short traces, since high di/dt switching currents travel in this loop. The exposed pad must be soldered to a sufficient PGND copper pour to minimize both electrical and thermal resistance. Avoid routing sensitive analog signals near the SW node because high dv/dt edges can couple through parasitic capacitance; shield with ground or guard traces if analog lines must pass nearby.
Use the recommended land pattern from the TI datasheet mechanical drawings page, including thermal vias in the exposed pad at 0.3 mm drill / 0.6 mm pad pitch 1.0 mm. Minimize the SW node copper area to reduce EMI; use a single point ground connection between AGND and PGND placed at the IC's exposed pad. Place the feedback resistor divider close to the FB pin and route away from the SW node to avoid noise injection that can cause jitter or output voltage error.
Do not exceed the 65 V continuous or 70 V transient input rating; sustained overvoltage will damage the integrated MOSFETs. The minimum 4.2-V VIN must be respected even at cold startup; below this the device's UVLO disables switching and the output will collapse. Avoid inductive loads that push negative voltage below ground on the SW node, which can exceed the absolute maximum ratings on the low-side FET. Finally, do not omit the RT/SS capacitor - it controls soft-start ramp time and prevents inrush current during power-up.
合规信息
Standard non-automotive grade. AEC-Q100 grade versions (LMR36510FADDAR-Q1 or similar) exist in the TI portfolio for safety-relevant automotive applications.
