LMR36015FBRNXT - 60V, 1.5A Sync Step-Down Converter | TI
料号： LMR36015FBRNXT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.15 | $215.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.55 | $1,550.00 |
LMR36015FBRNXT 概述
What is a synchronous buck converter? A buck converter (step-down switching regulator) is a switched-mode power supply topology that efficiently converts a higher DC voltage to a lower DC voltage by rapidly switching an inductor-capacitor energy transfer network. Synchronous buck converters replace the traditional Schottky rectifier with a low-side MOSFET, which improves efficiency at light loads and reduces conduction losses. Buck converters belong to the broader hierarchy: DC/DC converter -> switching regulator -> power management IC -> semiconductor.
Key features of the LMR36015 include 400 kHz switching frequency (typical), 0.4 V dropout at 1.5 A load, junction temperature range of -40 C to +150 C, and pin compatibility with the LMR36006 (60 V, 0.6 A) and LMR33620/LMR33630 (36 V, 2 A or 3 A) families. Functional safety-capable documentation is available to aid ISO 26262 system design, and the device is designed for reliable, rugged industrial applications.
The LMR36015 uses peak current-mode control with internal loop compensation, eliminating the need for external compensation components. The 400 kHz switching frequency balances efficiency with small external inductor and capacitor sizing, while the 12-pin VQFN-HR package with thermal pad enables high power density designs. Integrated input transient protection up to 66 V reduces external TVS component count.
Typical applications include industrial programmable logic controllers (PLCs), factory automation sensors, motor control auxiliary rails, building security cameras, and grid-tied energy metering. The 60 V input rating makes it well suited for 24 V and 48 V industrial bus architectures.
When designing with the LMR36015, use the WEBENCH Power Designer tool to validate component selection. The exposed thermal pad must be soldered to a ground copper pour of at least 50 mm squared to achieve the rated thermal performance. Input capacitance should be sized for 4.7 uF minimum with low-ESR ceramic to handle input ripple current.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet, including AEC-Q100 automotive variant recommendations and cross-brand alternatives.
直接替换替代料： LMR36015FBRNXT ——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：
LMR36015AQRNXTQ1
✅ 直接替换📋 参考替代料（不在目录中）
LMR36015FBRNXR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36006RNXR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33630ARNXR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33620ARNXR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36015FBRNXT 最大额定值与电气特性
| 拓扑 | Synchronous Step-Down (Buck) Converter |
| 输入电压范围 | 4.2 V to 60 V (66 V transient) |
| 输出电压范围 | 1 V to 57 V (adjustable) |
| 最大输出电流 | 1.5 A |
| 开关频率 | 400 kHz (typical) |
| 压差电压 | 0.4 V at 1.5 A (typical) |
| 工作温度范围 | -40 C to +150 C (junction) |
| 封装 | 12-pin VQFN-HR (RNX) |
| 安装类型 | Surface Mount |
| Control Mode | Peak Current Mode with internal compensation |
| 软启动 | Internal (programmable) |
| Protection Features | OCP, OVP, OTP, UVLO |
| RoHS 状态 | Compliant |
| Functional Safety | Functional Safety-Capable documentation available |
LMR36015FBRNXT 引脚配置
| 引脚 1 | AGND — Analog ground reference |
| 引脚 2 | VIN — Input supply voltage (4.2 V to 60 V) |
| 引脚 3 | EN — Enable input (active high) |
| 引脚 4 | RT/SS — Soft-start timing capacitor |
| 引脚 5 | FB — Feedback voltage for output regulation |
| 引脚 6 | COMP — Compensation network (internal) |
| 引脚 7 | PGOOD — Power good indicator output |
| 引脚 8 | PGND — Power ground (return path) |
| 引脚 9 | PGND — Power ground (return path) |
| 引脚 10 | SW — Switch node to external inductor |
| 引脚 11 | SW — Switch node to external inductor |
| 引脚 12 | VIN — Input supply voltage (4.2 V to 60 V) |
典型应用
LMR36015FBRNXT 适用于 6 应用s: Industrial PLC Power Rails, Factory Automation Sensor Nodes, Building Security Camera Systems, Grid-Tied Energy Metering, Motor Control Auxiliary Rails, Automotive Body Electronics.
Industrial PLC Power Rails
The LMR36015FBRNXT fits industrial PLC power rail designs because its 4.2 V to 60 V input range directly accepts 24 V nominal industrial bus voltages (which often see transients up to 36 V) without front-end protection. The 1.5 A output current can power PLC logic, I/O modules, and isolated communication interfaces from a single buck stage. With 400 kHz switching and internal compensation, the LMR36015 reduces external LC component count, saving PCB area in DIN-rail mounted PLC designs. The 0.4 V dropout at 1.5 A ensures full output regulation even during input brownouts common in factory environments. Designers can use TI's WEBENCH Power Designer to optimize the inductor and capacitor selection for each PLC subsystem.
推荐
Factory Automation Sensor Nodes
Sensor nodes in factory automation benefit from the LMR36015FBRNXT's wide input range and small 12-pin VQFN-HR footprint. The 60 V continuous input tolerates long cable runs from 24 V or 48 V power buses where inductive kickback and switching transients are common. The 1.5 A output current is sufficient to power multi-sensor hubs including analog front ends, digital isolators, and RS-485 transceivers. The 400 kHz switching frequency enables small inductor and capacitor selection, fitting the converter into space-constrained M12 sensor connector housings. The exposed thermal pad and -40 C to +150 C junction range support operation in high-temperature factory cabinets. Internal OCP and OTP simplify IEC 61131-2 compliance.
推荐
Building Security Camera Systems
The LMR36015FBRNXT is well-suited for outdoor PoE-powered or 24 V AC-powered security camera systems. Its 60 V transient tolerance (66 V per IEC 61000-4-5 surge testing) protects against lightning-induced transients on outdoor cable runs without external TVS components. The 1.5 A output supports camera image sensor, ISP, and heater element power needs simultaneously. The internal soft-start and power-good output enable coordinated power-up sequencing with downstream PMICs, critical for proper image sensor initialization. With 400 kHz switching and a 12-pin VQFN-HR package, the design fits inside IP66-rated camera housings alongside the image sensor board. The wide temperature range supports outdoor deployment in extreme climates.
推荐
Grid-Tied Energy Metering
Energy metering equipment in grid-tied solar inverters and smart meter applications benefits from the LMR36015FBRNXT's 60 V continuous input, which handles rectified 48 V photovoltaic panel output or rectified mains input. The 1.5 A output current is sufficient to power metering ICs, isolated communication modems, and display drivers. The internal peak current-mode control with internal compensation eliminates compensation network tuning, reducing time-to-market for new meter designs. The functional safety-capable documentation supports designs targeting IEC 61850 or similar smart grid safety standards. The exposed thermal pad allows PCB bottom-side cooling in sealed meter enclosures where airflow is limited.
推荐
Motor Control Auxiliary Rails
The LMR36015FBRNXT powers auxiliary rails in motor control systems, where 24 V or 48 V DC bus voltages are common. Its 60 V input range with 66 V transient tolerance handles regenerative braking voltage spikes on the DC bus that would damage lower-voltage converters. The 1.5 A output can power gate driver supplies, encoder interfaces, and communication isolated links alongside the main motor drive. The compact 12-pin VQFN-HR package fits on the auxiliary supply section of the motor control PCB, separated from the high-power switching stage. Internal OCP and OTP protect against motor stall-induced voltage transients. The 400 kHz switching frequency avoids interference with PWM motor drive frequencies through careful frequency selection.
推荐
Automotive Body Electronics
The LMR36015AQRNXTQ1 (the AEC-Q100 qualified variant of the LMR36015 family) serves automotive body electronics including LED lighting drivers, HVAC control modules, and body control modules. Operating from 12 V or 24 V automotive bus voltages, the converter handles load-dump transients up to 60 V without external protection. The 1.5 A output supports multiple downstream loads from a single buck stage, reducing PCB area in space-constrained body modules. The AEC-Q100 Grade 1 qualification supports -40 C to +125 C ambient operation under the hood or in cabin environments. Functional safety-capable documentation aids ISO 26262 ASIL-B system design. The 400 kHz switching and internal compensation minimize the BOM count critical for cost-sensitive automotive designs.
推荐
推荐产品汇总
工程参考数据： LMR36015FBRNXT ——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 | LMR36015AQRNXTQ1 | LMR36015FBRNXR | LMR36006RNXR | LMR33630ARNXR | LMR33620ARNXR |
|---|---|---|---|---|---|---|
| Package | VQFN-HR-12 (RNX) | VQFN-HR-12 (RNX) - same | VQFN-HR-12 (RNX) - same | VQFN-HR-12 (RNX) - same | VQFN-HR-12 (RNX) - same | VQFN-HR-12 (RNX) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 4.2 V to 60 V | 4.2 V to 60 V | 4.2 V to 60 V | 4.2 V to 60 V | 4 V to 36 V (-40%) | 4 V to 36 V (-40%) |
| Output Current | 1.5 A | 1.5 A | 1.5 A | 0.6 A (-60%) | 3 A (+100%) | 2 A (+33%) |
| Switching Frequency | 400 kHz | 400 kHz | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Output Voltage Range | 1 V to 57 V | 1 V to 58 V | 1 V to 57 V | 1 V to 57 V | 1 V to 34 V | 1 V to 34 V |
| Automotive Grade (AEC-Q100) | No | Yes (AEC-Q100) | No | No | Q1 variant available | Q1 variant available |
| Junction Temperature Range | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C |
关键差异点
- Wide 60 V continuous / 66 V transient input voltage range （对比 LMR33630ARNXR)
- Pin-compatible with multiple TI buck converter families （对比 LMR36006RNXR)
- Internal peak current mode control with internal compensation （对比 LMR33620ARNXR)
- Functional Safety-Capable documentation for ISO 26262 systems （对比 LMR36015FBRNXR (reel variant))
设计说明
The 12-pin VQFN-HR package relies on the exposed thermal pad for heat dissipation. At 60 V to 5 V conversion at 1.5 A, the LMR36015FBRNXT dissipates approximately 0.5 W typical, but at higher duty cycles this can exceed 1 W. Solder the exposed pad to a ground copper pour of at least 50 mm squared on the top or bottom PCB layer. Avoid thermal vias-only designs; use direct copper attachment with vias placed in a grid pattern for best thermal transfer. For continuous 1.5 A operation above 50 C ambient, calculate junction temperature rise as: Delta_T_J = P_dissipation * theta_JA where theta_JA is approximately 35 C/W on a standard JEDEC 4-layer test board.
Place the input ceramic capacitor (4.7 uF minimum, X7R, 100 V rating) as close as possible to the VIN and PGND pins, within 2 mm trace length. The bootstrap capacitor (0.1 uF, X7R, 16 V) between SW and BST must also be placed close to the IC. Keep the SW node traces short and away from sensitive analog feedback traces to minimize noise coupling. Use a ground plane on the second layer with the PGND and AGND connected at a single point near the IC's exposed pad. The feedback resistor divider should connect to the output at the point-of-load, not at the inductor output, to avoid IR drop in the trace.
Do not exceed 60 V continuous input voltage or 66 V transient voltage. Under-voltage lockout (UVLO) prevents operation below 4.0 V typical. The RT/SS pin capacitor value (typically 10 nF to 100 nF) controls soft-start time; do not leave it floating or use a value larger than 1 uF which can cause startup issues. The EN pin has an internal pull-up to VIN through a 1 Mohm resistor, but external noise can trigger enable; add a 10 nF bypass capacitor if the input source has high impedance. Do not use the LMR36015 in floating output configurations without a feedback path - the converter requires a continuous feedback loop to regulate. Output capacitor ESR affects loop stability; use ceramic X7R capacitors or low-ESR tantalum capacitors rated for the switching frequency.
合规信息
RoHS and REACH compliant per TI product page. AEC-Q100 qualification NOT applicable to this part number - choose LMR36015AQRNXTQ1 for automotive grade. Functional Safety-Capable documentation available for ISO 26262 system design.
