LM536355QRNLRQ1 - 3.5A 36V Auto Sync Step-Down DC-DC | TI
料号： LM536355QRNLRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.43 | $44.30 |
| 100 | $3.94 | $394.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.16 | $3,160.00 |
| 3,000 | $2.77 | $8,310.00 |
LM536355QRNLRQ1 概述
A buck (step-down) switching regulator is a DC-DC converter topology that uses an integrated high-side MOSFET, a low-side synchronous rectifier, an inductor, and output capacitors to deliver a lower regulated voltage from a higher input rail. Buck regulators sit in the power-management hierarchy: switching regulator -> DC-DC converter -> power management IC. They outperform linear regulators at large VIN/VOUT ratios because the synchronous rectification keeps efficiency in the 80-95% range, dramatically reducing thermal dissipation in space-constrained automotive ECUs.
Key features of the LM536355QRNLRQ1 include 3.5-A continuous output current, 2.1-MHz fixed-frequency operation, AEC-Q100 qualification, 18-V minimum input for a 3.3-V output (per TI product page), internal synchronous FETs, and an adjustable or fixed 5-V output option. The 22-pin VQFN-HR package exposes a thermal pad that, with proper copper area, keeps junction temperature within the 150C automotive Grade-1 limit. Advanced high-speed control loops deliver sub-1% load regulation and fast line transient response for processor rails.
The LM536355QRNLRQ1 uses peak-current-mode control with internal compensation, eliminating the need for an external compensation network. The architecture supports spread-spectrum frequency modulation (optional) to ease CISPR 25 EMI compliance in automotive designs. Cycle-by-cycle current limit and thermal shutdown protect the IC from overload and short-circuit faults typical in body-electronics harnesses.
Typical applications include automotive infotainment head units, ADAS camera/sensor power, instrument clusters, and body-control modules where a clean 5-V rail is required from a noisy 12-V or 24-V battery bus. The 3.5-A rating also suits USB-PD car chargers and lighting controllers. Designers also use it in industrial PoE point-of-load stages that need 5-V at high current from a 24-V bus.
When designing with the LM536355QRNLRQ1, follow the datasheet recommended inductor (typically 1.0 uH to 2.2 uH) and use X7R 10 uF/25-V ceramic input capacitors plus 22 uF/10-V ceramic output capacitors to keep ripple under 30 mV. Place the input capacitors within 5 mm of the PVIN pin and the exposed pad over a 4-cm^2 top-side copper pour to control thermal resistance.
This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, application block diagrams, and PCB-layout guidance not found in the manufacturer datasheet, providing an at-a-glance reference for automotive power-stage selection.
直接替换替代料： LM536355QRNLRQ1 ——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：
LM53635NQRNLRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LM53635NQRNLTQ1
✅ 直接替换📋 参考替代料（不在目录中）
LM53625NQRNLRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LM536355QRNLRQ1 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 3.5 V to 42 V |
| 输出电压 | 5 V fixed |
| 最大输出电流 | 3.5 A |
| 开关频率 | 2.1 MHz (fixed) |
| Minimum Input for 3.3 V Output | 18 V |
| 封装 | VQFN-HR-22 (RNL) 4.5 mm x 3.5 mm |
| 输出数量 | 1 |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +150C (AEC-Q100 Grade 1) |
| AEC-Q100 Qualification | Yes (automotive Grade 1) |
| RoHS 状态 | Compliant |
| 输出类型 | Fixed |
| 同步整流器 | Yes (internal low-side FET) |
| Control Mode | Peak Current Mode |
| Spread-Spectrum Modulation | Yes (optional, for EMI) |
| Thermal Protection | Thermal Shutdown |
LM536355QRNLRQ1 引脚配置
| 引脚 1 | PGND — Power ground return for low-side FET |
| 引脚 2 | SW — Switch node - connection to inductor |
| 引脚 3 | SW — Switch node - connection to inductor |
| 引脚 4 | VIN — Input supply voltage |
| 引脚 5 | VIN — Input supply voltage |
| 引脚 6 | EN — Enable (active high) |
| 引脚 7 | RT/SYNC — Frequency set / sync input |
| 引脚 8 | SS/TRK — Soft-start / tracking |
| 引脚 9 | FB — Voltage feedback |
| 引脚 10 | COMP — Compensation network |
| 引脚 11 | PG — Power good indicator |
| 引脚 12 | NC — Not connected |
| 引脚 13 | NC — Not connected |
| 引脚 14 | AGND — Analog ground |
| 引脚 15 | BST — Bootstrap for high-side gate drive |
| 引脚 16 | VIN — Input supply voltage |
| 引脚 17 | VIN — Input supply voltage |
| 引脚 18 | SW — Switch node - connection to inductor |
| 引脚 19 | SW — Switch node - connection to inductor |
| 引脚 20 | PGND — Power ground return |
| 引脚 21 | PGND — Power ground return |
| 引脚 22 | PGND — Power ground return |
典型应用
LM536355QRNLRQ1 适用于 6 应用s: Automotive Infotainment Power Supply, ADAS Camera & Sensor Power, Automotive Body Control Module (BCM), Industrial 24-V Point-of-Load Converter, USB-PD Car Charger Front-End, LED Driver & Lighting Controller.
Automotive Infotainment Power Supply
The LM536355QRNLRQ1 is ideal for automotive infotainment head units where a clean 5-V rail powers USB hub controllers, audio DSPs, and Ethernet PHYs. Its 3.5-A output handles infotainment rail surges during audio peaks, and the 2.1-MHz switching frequency places harmonics above the AM broadcast band, eliminating shielded magnetics in the wiring harness. The AEC-Q100 Grade 1 qualification (-40C to +150C) and 42-V load-dump tolerance are mandatory for under-dash installations, while internal synchronous FETs reduce BOM cost and PCB area. Place the converter upstream of a downstream LDO such as the TPS7A4701 for noise-sensitive audio DACs.
推荐
ADAS Camera & Sensor Power
The LM536355QRNLRQ1 powers 5-V rails for ADAS forward-facing camera modules, surround-view sensors, and radar transceivers. The 3.5-A output supports multi-camera systems where each sensor draws up to 700 mA, and the wide 3.5-V to 42-V input maintains regulation through cold-crank events down to 3.5 V (per the TI datasheet). The 2.1-MHz switching frequency avoids interference with 24-GHz radar IF bands. The AEC-Q100 Grade 1 qualification is essential for safety-critical ADAS ECUs, and the small 4.5 mm x 3.5 mm VQFN-HR package fits inside tight sensor housings. Pair with ISO7761 digital isolators for serializer links.
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Automotive Body Control Module (BCM)
The LM536355QRNLRQ1 powers body control modules that drive lighting, door locks, and HVAC actuators from a 5-V/3.5-A rail. The 42-V load-dump tolerance handles jump-start events on a 12-V battery, while the 3.5-A continuous current supports multiple downstream 3.3-V LDO loads. Per the TI datasheet, the synchronous architecture delivers 85-90% efficiency at 12-V to 5-V conversion, minimizing heat dissipation in the sealed BCM enclosure. The 2.1-MHz switching keeps EMI below CISPR 25 Class 5 limits when combined with spread-spectrum mode and the recommended input filter. Pair with CAN transceivers such as the TCAN334G for body network connectivity.
推荐
Industrial 24-V Point-of-Load Converter
Beyond automotive, the LM536355QRNLRQ1 is widely used in industrial 24-V bus systems to step 24 V down to 5 V at 3.5 A for PLC digital I/O, industrial Ethernet switches, and HMI panels. The 42-V input tolerance accommodates 24-V bus transients and inductive kickback from relay coils, while the AEC-Q100 Grade 1 thermal rating provides extra margin in industrial enclosures with limited airflow. The 2.1-MHz fixed frequency simplifies EMI filter design for IEC 61000-6-2 industrial immunity compliance. The synchronous buck topology delivers 90%+ efficiency at 24 V to 5 V, eliminating the need for bulky heatsinks in DIN-rail mounted equipment.
推荐
USB-PD Car Charger Front-End
The LM536355QRNLRQ1 serves as the front-end 5-V/3.5-A regulator in dual-port USB-PD car chargers. The wide 3.5-V to 42-V input maintains regulation across automotive cranking and load-dump transients, and the 3.5-A output supports 5-V/1.5-A per port for two downstream Type-A ports. According to the TI LM53635-Q1 datasheet, the 2.1-MHz fixed frequency and spread-spectrum option simplify CISPR 25 Class 5 compliance for radiated emissions. The 22-pin VQFN-HR package fits inside the small form factor of a 12-V cigarette-lighter adapter. Pair with a downstream TPS65987D USB-PD controller for Type-C PD negotiation up to 20 V.
推荐
LED Driver & Lighting Controller
The LM536355QRNLRQ1 powers 5-V rails for automotive LED driver modules controlling daytime running lights, tail lamps, and interior ambient lighting. The 3.5-A output supports multi-channel LED drivers such as the TLC5941 or LP8863, and the 42-V input tolerance handles 24-V truck battery systems for commercial vehicles. Per the TI datasheet, the 2.1-MHz switching frequency is well above the audible band, eliminating coil whine in interior lighting applications. The AEC-Q100 Grade 1 qualification is required for exterior lighting modules exposed to under-hood temperatures. The exposed thermal pad of the VQFN-HR package dissipates up to 2 W at 12-V input without external heatsinking.
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推荐产品汇总
工程参考数据： LM536355QRNLRQ1 ——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 | LM53635NQRNLRQ1 | LM53635NQRNLTQ1 | LM53625NQRNLRQ1 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-HR-22 (RNL) 4.5x3.5 mm | VQFN-HR-22 (RNL) - same | VQFN-HR-22 (RNL) - same | VQFN-HR-22 (RNL) - same |
| Output Current | 3.5 A | 3.5 A | 3.5 A | 2.5 A |
| Output Voltage | 5 V fixed | Adjustable 1-20 V | Adjustable 1-20 V | Adjustable 1-20 V |
| Input Voltage Range | 3.5 V to 42 V | 3.5 V to 42 V | 3.5 V to 42 V | 3.5 V to 42 V |
| Switching Frequency | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz |
| AEC-Q100 Grade | Grade 1 (-40C to +150C) | Grade 1 | Grade 1 | Grade 1 |
| Unit Price (qty 1000) | $3.16 | $3.16 | $3.16 | $2.85 |
关键差异点
- Fixed 5-V output eliminates external feedback resistor divider （对比 LM53635NQRNLRQ1)
- Higher 3.5-A output current than the 2.5-A variant （对比 LM53625NQRNLRQ1)
- AEC-Q100 Grade 1 qualification for under-hood and safety-critical designs （对比 Non-automotive 36-V buck ICs)
设计说明
At VIN=12 V, VOUT=5 V, IOUT=3.5 A, the LM536355QRNLRQ1 dissipates approximately 3.5 W (estimated: P = (VIN - VOUT) * IOUT * (1 - efficiency) at 85% efficiency). The 22-pin VQFN-HR package with a 4-cm^2 top-side copper pour keeps theta_JA near 35 C/W, limiting junction temperature rise to ~125C above ambient - within AEC-Q100 Grade 1 limits. Increase copper area to 6-8 cm^2 or add bottom-side thermal vias for continuous 3.5-A operation at 85C ambient.
Place the 10-uF/50-V X7R input ceramic capacitor within 3 mm of the PVIN pins (4, 5, 16, 17) and connect the PGND pins (1, 20, 21, 22) directly to a top-side ground pour. Use 22-uF/10-V X7R output ceramic capacitors with a 2.2-uH inductor (datasheet recommended value) to keep output ripple below 30 mV. The exposed thermal pad (pin 23) must be soldered to a continuous copper plane with 5-9 thermal vias to the internal ground plane.
Enable the spread-spectrum frequency modulation feature to reduce conducted EMI peaks by 10-15 dB and ease CISPR 25 Class 5 compliance for automotive designs. The 2.1-MHz fundamental places harmonics above the AM broadcast band (530-1700 kHz), but a small input filter (1-uH inductor + 4.7-uF capacitor pi filter) is recommended on the PVIN line to suppress switching ripple coupling into the battery harness. Keep the SW node copper area minimal to reduce radiated EMI.
合规信息
AEC-Q100 Grade 1 qualified per the TI LM53635-Q1 datasheet. RoHS and REACH compliant. Halogen-free per TI's automotive-grade material declaration. -Q1 suffix indicates automotive-grade reliability and traceability.
