TPS2054AD - Quad 500mA USB Power Distribution Switch | TI
MPN： TPS2054AD ✓ 啟用中TPS2054AD 概覽
A power-distribution switch, also called a high-side load switch or USB power switch, is a power management IC that sits between a supply rail and a load, turning the load on and off with a logic-level enable signal while protecting the upstream supply from faults. Within the power management hierarchy, it belongs to the power-distribution switch and load-driver class, complementing voltage regulators and hot-swap controllers in multi-port systems.
Key features include independent enable inputs (CMOS- and TTL-compatible, active-high) for each channel pair, a per-channel current limit with independent thermal and short-circuit protection, and a shared fault-report logic output that flags overcurrent conditions to a host controller. A 2.5 ms typical output rise time limits inrush current when switching heavy capacitive loads, and undervoltage lockout keeps the outputs off until the input rail is valid.
Architecturally, each N-channel MOSFET switch is driven by an internal charge-pump gate driver, which keeps on-resistance low at only 80 mOhm and minimizes voltage drop at full 500 mA load. Response to short circuits is fast, protecting the input rail from brownout during fault events.
Typical applications include USB host and hub port power switching, hot-plug power distribution in set-top boxes and peripherals, and multi-rail power sequencing in industrial systems where heavy capacitive loads and short circuits are likely.
A key design consideration: at 5.5 V input and full load on all four channels, estimate conduction loss as 4 x I^2 x RDS(on) = 4 x 0.25 x 0.08 = 80 mW (estimated), which the SOIC-16 package dissipates without a heatsink, but PCB copper around pins still aids thermal relief.
This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing, drop-in same-brand alternatives (TPS2054BD, TPS2054DG4), and practical design notes for power-distribution switching designs.
直接替換替代品，適用於 TPS2054AD — 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： TPS2054AD （相同外形與佔位） — 差異在於 Switch Type, Package, Category, Fault Reporting, On-Resistance.
TPS2054BDR
✅ 直接替換聯絡詢價
查看資料表 →TPS2054BDR
✅ 直接替換聯絡詢價
查看資料表 →TPS2054DG4
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2054AD 最大額定值與電氣特性
| 拓撲 | 4 high-side switches (2 enable inputs / 4 outputs) |
| Switch Type | N-Channel MOSFET, high-side 1:1 |
| 輸入電壓範圍 | 2.7 V to 5.5 V |
| Continuous Output Current | 500 mA per channel |
| 電流限制 | 0.9 A (minimum) |
| On-Resistance | 80 mOhm |
| Output Rise Time | 2.5 ms typical |
| Enable Inputs | Active-high, CMOS- and TTL-compatible |
| Fault Reporting | Overcurrent logic output, active-low |
| Protection Features | Independent thermal shutdown and short-circuit protection per channel, undervoltage lockout |
| 封裝 | 16-SOIC (0.154 in, 3.90 mm width) |
| 安裝類型 | Surface Mount |
| 類別 | Power Management (PMIC) - Power Distribution Switches, Load Drivers |
TPS2054AD 16-soic (0.154 in, 3.90 mm width) 腳位配置指南
TPS2054AD（16-soic (0.154 in, 3.90 mm width) 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： TPS2054AD.
請參閱 資料表 以查看完整腳位配置。
典型應用
TPS2054AD 適用於 6 應用s: USB Host and Hub Port Power Switching, Hot-Swap Power Distribution in Set-Top Boxes and Peripherals, Industrial Multi-Rail Power Sequencing, Battery-Powered and Portable Equipment Load Switching, Point-of-Load Power Gating in Networking Equipment, Test and Measurement Instrumentation Power Distribution.
USB Host and Hub Port Power Switching
The TPS2054AD is purpose-built for USB port power distribution: its 500 mA per-channel rating matches legacy USB VBUS current budgets, the 2.7 V to 5.5 V input range accepts both 3.3 V and 5 V system rails, and the 0.9 A current limit protects the upstream supply from overloaded or shorted downstream ports. The 2.5 ms typical rise time suppresses hot-plug inrush current when a device with large bulk capacitance is connected. Because the part provides four switches with independent enables and per-channel thermal and short-circuit protection in one SOIC-16 package, a hub designer can power-switch four downstream ports with a single IC and one fault output to the hub controller. The trade-off versus a discrete MOSFET solution is roughly 40 mV of dropout per port at full load, which must be budgeted within the VBUS droop requirement.
推薦
Hot-Swap Power Distribution in Set-Top Boxes and Peripherals
In set-top boxes, printers, and multi-function peripherals, several sub-systems are powered from a shared 5 V rail, and the TPS2054AD lets each sub-system be switched and protected independently. The device is, per TI documentation, intended for applications where heavy capacitive loads and short circuits are likely to be encountered, which describes hot-plug peripherals precisely. Its controlled 2.5 ms soft-start avoids the input-rail brownout that a hard-switched MOSFET would cause when a board with large input capacitors is inserted. The per-channel fault-report output gives the main processor visibility into which load misbehaved, enabling graceful recovery instead of a full-system reset. With 80 mOhm on-resistance, conduction loss is only about 20 mW per channel at 500 mA (estimated), so the SOIC-16 package needs no heatsink at typical loads.
推薦
Industrial Multi-Rail Power Sequencing
Industrial controllers frequently need several 5 V or 3.3 V loads switched in a defined order during power-up. The TPS2054AD supports this with two CMOS/TTL-compatible active-high enable inputs controlling four switch outputs, letting a microcontroller GPIO sequence rails with simple logic. Undervoltage lockout keeps all outputs off until the input rail is valid, preventing partially-powered operation during brownout. Because each channel has independent thermal and short-circuit protection, a fault on one actuator or sensor rail does not disable the remaining channels - important in factory equipment where uptime matters. The 2.7 V minimum input also supports 3.3 V-only logic boards. Designers should verify that total continuous load across four channels stays within the package thermal capability, which at moderate currents is not restrictive (estimated under 100 mW total at 500 mA per channel).
推薦
Battery-Powered and Portable Equipment Load Switching
Portable instruments and battery accessories running from 3.3 V or 5 V supplies use the TPS2054AD to disconnect idle loads and extend battery life. The N-channel MOSFET switches with 80 mOhm on-resistance present minimal series loss (about 20 mV dropout at 250 mA, estimated), preserving scarce voltage headroom on 3.3 V rails. TTL-compatible enables can be driven directly from low-voltage logic or a pushbutton debounce circuit, and the fault output can wake a supervisory MCU when a shorted accessory is detected. The quad configuration allows one IC to power-switch a display backlight, sensor front end, radio module, and memory card separately. Compared with discrete load-switch ICs with quiescent-current budgets that vary, this family was specifically characterized for USB-class portable power distribution per the TI datasheet.
推薦
Point-of-Load Power Gating in Networking Equipment
Routers, switches, and line cards often gate power to removable or optional modules such as SFP cages, fan trays, and management interfaces. The TPS2054AD provides four independently enabled, current-limited switches from one SOIC-16 footprint, reducing BOM count versus four discrete MOSFET-and-driver circuits. The 0.9 A minimum current limit is fast-acting enough to protect the backplane 5 V rail from a shorted module, and the fault-report line can route to the system CPLD or microcontroller for hot-swap event logging. The 2.5 ms soft-start is well matched to module input capacitance in the tens of microfarads. Because the part is available in the same footprint as the 70 mOhm TPS2054BD, high-availability designs can second-source within the family without any PCB change, which is a meaningful supply-chain benefit for long-life networking hardware.
推薦
Test and Measurement Instrumentation Power Distribution
Bench instruments and modular test fixtures use the TPS2054AD to power-gate DUT supplies, probe accessories, and interface boards independently. The precise 0.9 A current limit doubles as a coarse electronic fuse, protecting both the instrument supply and the device under test during accidental shorts - a common event in fixture debugging. Independent per-channel protection means a shorted DUT channel does not interrupt the others, so multi-site testing can continue. The fault output gives test software immediate overcurrent visibility for pass/fail logging. The SOIC-16 package hand-solders and reflows easily for fixture prototypes, and the 2.7 V to 5.5 V input range covers common lab rail voltages. At the modest currents typical of instrumentation loads, dropout of roughly 20-40 mV per channel is negligible against typical 5 V supply accuracy requirements (estimated).
推薦
推薦產品摘要
工程參考資料，適用於 TPS2054AD — 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 | TPS2054BDR | TPS2054BD | TPS2054DG4 |
|---|---|---|---|---|
| Package | 16-SOIC (D) | 16-SOIC (D) - same | 16-SOIC (D) - same | 16-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| On-Resistance | 80 mOhm | 70 mOhm | 70 mOhm | 80 mOhm |
| Continuous Current per Channel | 500 mA | 500 mA | 500 mA | 500 mA |
| Current Limit | 0.9 A (min) | 0.9 A (min) | 0.9 A (min) | 0.9 A (min) |
| Input Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Fault Report Output | Yes | Yes | Yes | Yes |
| Output Rise Time | 2.5 ms typical | 2.5 ms typical | 2.5 ms typical | 2.5 ms typical |
主要差異化特點
- Lower conduction loss option available on identical footprint (對比TPS2054BDR)
- Quad channels with independent protection in one package (對比Discrete MOSFET solutions)
- Controlled 2.5 ms soft-start (對比Plain high-side MOSFET switches)
設計說明
Estimated: with all four channels at 500 mA continuous from a 5 V input, conduction loss is 4 x I^2 x RDS(on) = 4 x 0.25 A^2 x 0.08 Ohm = 80 mW total, which the 16-SOIC package handles without a heatsink. If loads approach the 0.9 A current limit continuously, per-channel loss rises to about 65 mW each (estimated), so provide solid ground copper around the SOIC-16 pads and verify junction temperature against the datasheet thermal impedance for your board stackup.
Place a low-ESR ceramic input capacitor (typical practice for this TI family is on the order of 1 uF to 10 uF, confirm the datasheet typical-application circuit) close to the VDD pin, and add output capacitance at each channel near the load connector to absorb hot-plug transients. Keep the fault-report trace routed to the host controller with a pull-up to a valid logic rail, since it is an open-style logic output. Power and ground traces for the switch outputs should be sized for 500 mA continuous per channel.
Do not drive loads above the 500 mA continuous rating - the 0.9 A current limit is a protection threshold, not an operating point; sustained operation near the limit triggers thermal cycling of the affected channel. Ensure enable inputs are not left floating during power-up; tie them to ground if unused, since undervoltage lockout alone does not define pin states before the input rail stabilizes. Also remember the 2.5 ms rise time: very small output capacitance with light loads is fine, but do not add series inductance (long cables) without reviewing inrush behavior against the current limit.
合規資訊
Compliance status not explicitly stated in the provided web data. Verify RoHS/REACH status on the official TI product page at ti.com/product/TPS2054 before production use.
