TPS54218RTE - 2A, 6V, 2MHz Sync Buck Converter | TI
MPN： TPS54218RTE ✓ 啟用中TPS54218RTE 概覽
A synchronous buck converter is a type of DC-DC switching voltage regulator that steps a higher input voltage down to a lower output voltage using two integrated MOSFETs - a high-side and a low-side switch - instead of an external Schottky diode. This topology belongs to the broader power management IC family and delivers significantly higher efficiency than linear regulators, especially at large step-down ratios, making synchronous buck converters the workhorse of point-of-load power conversion in modern electronics.
Key features of the TPS54218 include two integrated n-channel MOSFETs, which reduce external component count and board area; constant-frequency peak current mode control, which simplifies external frequency compensation and reduces output capacitance requirements; and a wide supported switching frequency range starting from 200 kHz and adjustable up to 2 MHz, allowing designers to trade efficiency against solution size.
Architecturally, the peak current mode control scheme provides fast transient response to line and load changes, which is critical for powering DSPs, FPGAs, and microprocessors with dynamic load profiles. The internal MOSFETs minimize switching node parasitics for clean switching behavior, and the high frequency capability enables the use of small inductors and ceramic output capacitors for compact point-of-load designs.
Typical applications include 5 V or 3.3 V rail point-of-load conversion for DSPs such as the TMS320F2803x series, general-purpose 2 A core and I/O rails in industrial control, and distributed power in networking and test equipment where a low profile, high-frequency solution is required.
When designing with this device, ensure the input voltage stays within the 2.95 V to 6 V absolute operating window and select the RT-set frequency and inductance appropriate for your ripple current and transient targets.
This page synthesizes distributor data, verified datasheet parameters, alternative-part context, and practical design notes in one place - information not consolidated in the manufacturer datasheet alone.
直接替換替代品，適用於 TPS54218RTE — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TPS54218RTE （相同外形與佔位） — 差異在於 Package, Topology, RoHS Status.
TPS54218RTER
✅ 直接替換聯絡詢價
查看資料表 →TPS54218RTE 最大額定值與電氣特性
| 拓撲 | Synchronous Step-Down (Buck) Converter |
| 輸入電壓範圍 | 2.95 V to 6 V |
| 最大輸出電流 | 2 A |
| 輸出類型 | Adjustable |
| Minimum Adjustable Output Voltage | 0.803 V |
| Switching Frequency Range | 200 kHz to 2 MHz |
| Control Topology | Constant Frequency Peak Current Mode |
| Integrated FETs | Two n-channel MOSFETs (high-side and low-side) |
| 封裝 | 16-WQFN with Exposed Pad (RTE) |
| 安裝類型 | Surface Mount |
| Series | SWIFT (Step-Down with Integrated FET Technology) |
| Marking Code | 54218 |
| Outputs | 1 |
| Polarity | Positive |
TPS54218RTE 16-wqfn with exposed pad (rte) 腳位配置指南
TPS54218RTE（16-wqfn with exposed pad (rte) 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： TPS54218RTE.
請參閱 資料表 以查看完整腳位配置。
典型應用
TPS54218RTE 適用於 6 應用s: DSP and Microcontroller Point-of-Load Power, FPGA and ASIC Core Rails, Industrial Control and Automation, Networking and Communications Equipment, Test and Measurement Instrumentation, Battery-Powered and Portable Equipment.
DSP and Microcontroller Point-of-Load Power
The TPS54218 is well suited to powering DSP and microcontroller core rails from a 5 V or 3.3 V intermediate bus. Its constant frequency peak current mode control provides the fast load transient response needed when processors switch between idle and active modes, holding output regulation with minimal output capacitance. With an adjustable output down to 0.803 V and up to 2 A capability, it can supply cores of devices such as the TMS320F2803x C2000 series. The 2 MHz maximum switching frequency permits small inductors and all-ceramic output filters, allowing the converter to sit directly adjacent to the processor power pins, minimizing board area and improving dynamic performance. Designers should set the RT resistor for the frequency/efficiency trade-off appropriate to their thermal budget.
推薦
FPGA and ASIC Core Rails
FPGA and ASIC core rails demand tight regulation and high efficiency at moderate current, exactly the profile the TPS54218 addresses from a 2.95 V to 6 V input. The integrated high-side and low-side n-channel MOSFETs eliminate an external Schottky diode, boosting efficiency and reducing the solution footprint, while peak current mode control simplifies the compensation network to a small set of passive components. When powering rails in the 0.9 V to 1.2 V range at up to 2 A, the wide 200 kHz to 2 MHz frequency range lets the designer optimize inductor size against light-load efficiency. Placing the converter close to the device, with a carefully selected ceramic output capacitor bank, keeps output ripple and AC load-line deviation inside FPGA core tolerance windows.
推薦
Industrial Control and Automation
In industrial control systems, the TPS54218 converts 5 V and 3.3 V backplane rails into localized 2 A supplies for logic, analog front ends, and interface circuitry. Its constant on-time stable peak current mode architecture tolerates wide line and load variation typical of factory environments, while the integrated MOSFETs reduce component count and improve long-term reliability by minimizing solder joints and external parts. The exposed-pad 16-WQFN package dissipates heat efficiently through the PCB, supporting full 2 A loads at elevated ambient temperatures when adequate copper area is provided. The frequency-adjustability also helps designers avoid sensitive frequency bands in systems containing precision analog or communication circuitry susceptible to switching-spur pickup.
推薦
Networking and Communications Equipment
Networking line cards, switch fabrics, and optical modules often need multiple small, efficient point-of-load converters stepping 5 V or 3.3 V intermediate rails down to chip-level voltages. The TPS54218's high 2 MHz switching capability shrinks the power stage footprint, important in dense board layouts with limited vertical and lateral space. Its peak current mode control keeps output impedance low during bursty traffic-driven load steps on PHY and MAC supply rails. The integrated FET synchronous rectification improves light-load efficiency, reducing overall board thermal dissipation in enclosed equipment. Designers should follow the datasheet layout guidelines, keeping the switching loop tight and placing the BOOT capacitor close to pin 1 to minimize radiated EMI near high-speed signal routing.
推薦
Test and Measurement Instrumentation
Bench instruments, data acquisition modules, and sensor interfaces require low-noise, tightly regulated local supplies derived from a 5 V system rail. The TPS54218 provides up to 2 A of adjustable output down to 0.803 V with predictable, constant-frequency switching, allowing designers to place switching spurs away from sensitive measurement bands by selecting the RT-set frequency. The device's good line and load regulation from peak current mode control keeps ADC and amplifier reference rails stable during instrument mode changes. Its small 16-WQFN footprint integrates neatly into crowded analog boards, and the exposed pad thermal path supports conduction cooling through grounded copper pours, which also aids EMI containment in precision measurement front ends.
推薦
Battery-Powered and Portable Equipment
Portable and battery-operated instruments powered by single-cell Li-ion or multi-cell NiMH packs that regulate down to an intermediate 3.3 V to 5 V rail can use the TPS54218 for efficient final point-of-load conversion. The synchronous architecture with integrated MOSFETs delivers higher efficiency than non-synchronous alternatives across the load range, extending battery runtime. The 2 MHz capability allows very small magnetics for slim enclosures and handheld form factors, while low external component count reduces BOM cost and assembly complexity in compact designs. Because the input window starts at 2.95 V, the device continues operating as a Li-ion cell discharges toward its end-of-charge threshold, maximizing usable capacity before the system enters shutdown or low-battery handling.
推薦
推薦產品摘要
工程參考資料，適用於 TPS54218RTE — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS54218RTER |
|---|---|---|
| Package | 16-WQFN with Exposed Pad (RTE) | 16-WQFN with Exposed Pad (RTE) - same |
| Brand | Texas Instruments | Texas Instruments |
| Input Voltage Range | 2.95 V to 6 V | 2.95 V to 6 V |
| Output Current | 2 A | 2 A |
| Switching Frequency Range | 200 kHz to 2 MHz | 200 kHz to 2 MHz |
| Minimum Output Voltage | 0.803 V | 0.803 V |
| Control Scheme | Constant frequency peak current mode | Constant frequency peak current mode |
| Packaging Format | Cut tape (RTE suffix) | Tape and reel (RTER suffix) |
主要差異化特點
- True 2 MHz switching capability (對比TPS54622)
- Integrated synchronous MOSFETs (對比TPS54218RTER)
- Simplified compensation via peak current mode control (對比TPS54622)
設計說明
For the 16-WQFN exposed pad package, the thermal pad must be soldered to a grounded copper area on the PCB; this pad is the primary heat removal path and also the device ground reference. Place the input ceramic capacitor, BOOT capacitor, and inductor as close to the IC as possible, keeping the switch-node (SW) copper area compact to reduce parasitic inductance and radiated EMI. Follow the TI datasheet PCB layout example, which shows a tight input loop and star-grounded analog components.
Estimated: at VIN = 5 V, VOUT = 1.2 V, and full 2 A load, output power is 2.4 W; with typical synchronous buck efficiencies of roughly 85-90 percent in this range, input power is approximately 2.7-2.8 W and device dissipation is on the order of 0.3-0.4 W. The exposed-pad WQFN handles this with a modest copper pour, but verify junction temperature against your ambient conditions and airflow. These figures are estimates from the stated input values, not datasheet guarantees - confirm with the TI datasheet efficiency curves.
Respect the 2.95 V minimum input voltage - operating below this threshold from a deeply discharged Li-ion cell will cause the converter to drop out of regulation. Set the RT resistor for a switching frequency that balances efficiency and size; running at 2 MHz maximizes miniaturization but increases switching losses versus 500 kHz-1 MHz operation. Do not omit the BOOT capacitor between BOOT and SW pins, as the integrated high-side driver requires it for proper startup and operation.
合規資訊
Standard TI production part in RoHS-compliant lead-free WQFN packaging. REACH and halogen-free declarations should be confirmed from TI's environmental data on the official product page.
