TPS54218RTER - 2A, 2MHz Sync Step-Down Buck | TI
料号： TPS54218RTER ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.39 | $0.39 |
| 10 | $0.37 | $3.70 |
| 100 | $0.34 | $34.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.29 | $290.00 |
TPS54218RTER 概述
A synchronous buck converter is a type of switching voltage regulator that steps a higher DC input voltage down to a lower regulated output voltage using two internal MOSFETs - a high-side control FET and a low-side synchronous rectifier - instead of an external Schottky diode. Within the power management hierarchy (DC-DC converter, switching regulator, power management IC), synchronous topologies improve efficiency at light and full load by eliminating diode conduction losses, which is why they dominate point-of-load designs in modern digital systems.
Key features include two integrated 30 mOhm (typical) MOSFETs delivering high efficiency at full 2A load, an externally synchronizable switching frequency from 200 kHz to 2 MHz for filter and footprint optimization, a precision 0.8V reference holding plus or minus 1 percent over temperature, and adjustable soft start with sequencing support. UV and OV power-good monitoring simplifies system supervision and fault reporting.
Architecturally, the TPS54218 belongs to TI's SWIFT family of point-of-load converters. The D-CAP-style adaptive on-time control approach delivers fast transient response with low output ripple while supporting ceramic output capacitors without complex compensation. The integrated FETs and compact 16-WQFN (RTE) exposed-pad package minimize the external component count and PCB area for space-constrained rails.
Typical applications include 5V or 3.3V point-of-load conversion for DSPs, FPGAs, and ASICs; DDR memory rail generation in networking and telecom equipment; and low-voltage rail powering in industrial and consumer systems where the narrow 2.95V to 6V input aligns with 3.3V and 5V intermediate bus rails.
When designing, select the inductor and output capacitor for the chosen switching frequency: at 2 MHz, smaller inductance values reduce solution size but increase ripple current, while operating near 200 kHz maximizes efficiency. Keep the PH and BOOT loops tight and use the exposed pad as the thermal ground.
This page synthesizes verified distributor pricing, drop-in alternative analysis, pinout guidance, and practical design notes not consolidated in the manufacturer datasheet.
直接替换替代料： TPS54218RTER ——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： TPS54218RTER （相同外形与封装尺寸） ——差异在于 Package, Topology, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
TPS54618QRLBRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS54426RSAR
✅ 直接替换📋 参考替代料（不在目录中）
TPS54218RTER 最大额定值与电气特性
| 拓扑 | Synchronous Step-Down (Buck) |
| 输入电压范围 | 2.95 V to 6 V |
| Output Voltage (Adjustable) | 0.803 V to 6 V (reference 0.8 V) |
| 最大输出电流 | 2 A |
| 开关频率 | 200 kHz to 2 MHz |
| Voltage Reference Accuracy | 0.8 V +/-1% over temperature |
| 高边 MOSFET 导通电阻 | 30 mOhm (typical) |
| 低边 MOSFET 导通电阻 | 30 mOhm (typical) |
| 输出数量 | 1 |
| Synchronization | External clock synchronization supported |
| 软启动 | Adjustable soft start / sequencing |
| Power Good | UV and OV power-good monitoring |
| 工作温度范围 | -40C to +150C (RTE) |
| 封装 | 16-WFQFN (RTE) with exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
TPS54218RTER 16-wfqfn (rte) with exposed pad 引脚配置指南
TPS54218RTER（16-wfqfn (rte) with exposed pad 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： TPS54218RTER.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS54218RTER 适用于 6 应用s: Point-of-Load Conversion for DSPs and FPGAs, DDR Memory Rail Generation, Networking and Telecom Equipment, Industrial Automation and Control, Battery-Powered Portable Systems, Test and Measurement Instrumentation.
Point-of-Load Conversion for DSPs and FPGAs
The TPS54218RTER fits point-of-load (POL) regulation for DSPs, FPGAs, and ASICs that are fed from a 3.3V or 5V intermediate bus. Its 0.8V reference held to plus or minus 1 percent over temperature meets the tight core-rail accuracy requirements of modern low-voltage silicon, while the 200 kHz to 2 MHz adjustable frequency lets designers run at 2 MHz to shrink the inductor below the footprint of dense processor clusters. The integrated 30 mOhm MOSFET pair sustains 2A continuous load with high efficiency, and the UV/OV power-good output gives the processor a rail-valid flag for sequencing and fault handling. Placed within millimeters of the load with tight PH and BOOT loops, it delivers fast transient response during core clock bursts without the ringback that external-diode designs often exhibit.
推荐
DDR Memory Rail Generation
Memory subsystems demand accurate, low-noise core and termination rails in a compact area, and the TPS54218RTER addresses both needs. The 0.8V plus or minus 1 percent voltage reference over temperature directly supports the accuracy windows of VDD rails for DDR3/DDR4-class devices, and the 2MHz capability permits small, low-profile inductors suitable for dense memory modules and mezzanine layouts. The adjustable soft-start controls inrush into large bulk capacitance banks common on memory boards, while the power-good signal lets the memory controller gate initialization until rails are valid. Efficiency at 2A from the integrated synchronous FETs limits local heating in enclosed memory compartments. Use a low-ESR ceramic output capacitor network to keep output ripple within the load's specification during burst read/write traffic.
推荐
Networking and Telecom Equipment
Line cards, switches, and small-cell radio units in networking and telecom equipment are built from 3.3V and 5V intermediate buses, exactly the 2.95V-6V window the TPS54218RTER is designed around. External clock synchronization allows hundreds of converters on a board to be locked to a single system clock, suppressing beat-frequency noise that can couple into high-speed SERDES and PHY rails. The 2A output covers PHY, microcontroller, and ASIC rails, and the wide frequency range lets designers tune each rail: high frequency for footprint-critical PHY supplies, low frequency for efficiency-critical always-on rails. Adjustable sequencing coordinates multi-rail power-up of processors and optics, improving field reliability in 24/7 telecom infrastructure.
推荐
Industrial Automation and Control
Industrial controllers, drives, and I/O modules frequently derive low-voltage logic rails from a 5V rail, and the TPS54218RTER provides a compact, efficient 2A step-down for this purpose. The -40C to +150C RTE package rating supports harsh cabinet environments, and the UV/OV power-good supervision provides early warning of brownout conditions on the factory floor. Synchronization to an external clock prevents low-frequency beat interference with sensitive analog front-ends such as current-sense amplifiers used in motor control. The adjustable soft-start supports graceful restart after fault clearing. Because the converter integrates both MOSFETs and operates from a fixed 5V bus, the external solution consists of just an inductor and a few ceramic capacitors, simplifying BOM management for high-volume industrial builds.
推荐
Battery-Powered Portable Systems
Single-cell lithium-ion systems regulated to about 3.3V-4.2V sit squarely inside the 2.95V-6V input range of the TPS54218RTER, making it a strong point-of-load choice for portable instruments, handheld testers, and battery-backed IoT gateways. Operating at 2 MHz keeps switching artifacts above sensitive signal bands and allows sub-millimeter-height inductors for thin enclosures. The synchronous topology's integrated 30 mOhm MOSFETs preserve battery runtime compared with external-diode buck designs, particularly at partial loads typical of duty-cycled radios. The enable and soft-start/sequencing pins support power-gating of subsystems to extend sleep time, while the power-good flag allows the host MCU to log rail health before shutdown during deep discharge events.
推荐
Test and Measurement Instrumentation
Bench and portable instruments need clean, accurate internal rails so that measurement accuracy is not corrupted by supply noise. The TPS54218RTER's 0.8V plus or minus 1 percent reference over temperature maintains rail accuracy across warm-up and environmental drift, while 2MHz operation places switching ripple far above the passband of low-speed analog sections, easing downstream LC filtering. External clock synchronization ties converter switching to the instrument's master clock, converting spurs into predictable, calibratable tones. The 2A output comfortably powers ADC, FPGA, and interface rails, and the power-good output supports the instrument's self-test diagnostics. Compact 16-WQFN (RTE) layout fits the crowded boards typical of handheld scopes and data loggers.
推荐
推荐产品汇总
工程参考数据： TPS54218RTER ——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 | TPS54618QRLBRQ1 | TPS54426RSAR |
|---|---|---|---|
| Package | 16-WFQFN (RTE) exposed pad | 16-pin QFN | 16-pin QFN class |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 2 A | 2 A | 4 A class |
| Reference in retrieved web data | ETEI comparison, IC-Components cross-ref list | Avaq comparison page | ETEI comparison page |
关键差异点
- Up to 2 MHz operation with external clock sync （对比 TPS54426RSAR)
- Automotive-qualified family option （对比 TPS54618QRLBRQ1)
- Integrated dual 30 mOhm MOSFETs at 2A （对比 TPS54120 / TPS54320 / TPS54620)
设计说明
Place the input capacitor, output capacitor, and inductor within a few millimeters of the RTE package. Keep the PH-to-inductor loop as short and wide as possible to minimize the high-frequency switching loop area, and route the BOOT capacitor directly from BOOT to PH. Solder the exposed pad to a solid ground pour with an array of thermal vias - the exposed pad is both the thermal path for 2A operation and the main grounding point for the device.
Choose the switching frequency based on the rail's priorities. At 2 MHz, a roughly 1 uH inductor keeps ripple manageable with very small solution size, but switching losses rise; near 200 kHz, a larger inductance (around 4.7 uH) improves efficiency for thermally constrained or battery-powered designs. Use low-ESR X5R/X7R ceramic output capacitors, which the device's control topology supports without elaborate compensation. Estimated: ripple current scales inversely with frequency and inductance, so halving the frequency roughly doubles required inductance for equal ripple.
Do not exceed the 6V maximum input - the TPS54218 is a narrow-input POL part, not a 12V-input converter; upstream transients on 5V rails can exceed 6V, so verify surge conditions or add input protection. Never leave SS/TR floating if a defined startup ramp is required, and route the RT/CLK pin per datasheet guidance when synchronizing to an external clock, since a poorly terminated sync line can cause frequency jitter and subharmonic behavior.
合规信息
RoHS compliant per distributor listings (DigiKey/Mouser) for the 16-WQFN (RTE) package. Commercial-grade part; use TPS54618QRLBRQ1 for AEC-Q100 automotive requirements. Obtain formal REACH and conflict-minerals declarations from TI's product page.
