TPS2041BQDBVRQ1 - Automotive 0.5A USB Power Switch SOT-23-5 | TI
MPN： TPS2041BQDBVRQ1 ✓ 啟用中TPS2041BQDBVRQ1 概覽
A USB power-distribution switch is a high-side load switch that sits between a 5 V bus and a downstream USB port or peripheral. It protects the host system from short circuits and over-current events by combining an N-channel MOSFET pass element with built-in current-limit, thermal shutdown, and undervoltage lockout. When the host asserts the active-low enable input, the switch closes to deliver current; when disabled, it presents a high-impedance path to block back-feeding.
Key features include an accurate current limit at approximately 1 A, an integrated 105 mΩ N-channel MOSFET, thermal and short-circuit protection, an active-low logic enable input, and a flag output that asserts on fault. The SOT-23-5 footprint keeps board area minimal, making the part suitable for compact infotainment, telematics, and body-electronics modules where PCB real estate is constrained.
The TPS2041BQDBVRQ1 uses an N-channel MOSFET pass element driven by an internal charge pump to achieve true low-RDS(on) high-side switching. This architecture minimizes I²R conduction loss on the 5 V rail and keeps thermal rise modest at the 500 mA continuous rating. The fixed current limit prevents the upstream automotive bus from sagging during load transients, while the thermal-shutdown circuit latches the switch off on excessive junction temperature.
Typical applications include USB port power switching in automotive head units, body control modules, and rear-seat infotainment hubs. The device is also used to switch individual loads downstream of an LDO, providing fault isolation between branches. The wide input range (2.7 V to 5.5 V) tolerates cold-crank and load-dump conditions typical of 12 V automotive systems after regulation.
When designing with this device, ensure the input supply is well-decoupled with at least 1 µF of ceramic capacitance placed close to IN. Avoid continuous operation above 500 mA and verify thermal performance against the SOT-23-5 θJA. This page synthesizes distributor pricing, drop-in alternatives, and design considerations not found in the manufacturer datasheet alone.
直接替換替代品，適用於 TPS2041BQDBVRQ1 — 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。
TPS2041BDBVR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2042BQDBVRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2051BQDBVRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2041BQDBVRQ1G4
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS2041BQDBVRQ1 最大額定值與電氣特性
| Part Number | TPS2041BQDBVRQ1 |
| Switch Type | High-Side Power Distribution Switch |
| 輸出數量 | 1 |
| 輸入電壓範圍 | 2.7 V to 5.5 V |
| Continuous Load Current | 500 mA |
| On-Resistance (RDS(on)) | 105 mΩ (typical) |
| 電流限制 | 1 A (typical, factory-trimmed) |
| Enable Input | Active-Low |
| 過熱關機 | Yes (with auto-retry) |
| Short-Circuit Protection | Yes |
| Fault Flag Output | Yes (active-low OC) |
| 工作溫度 | -40 C to +125 C |
| 封裝 | SOT-23-5 (DBV) 2.90 mm x 1.60 mm |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 |
| Automotive Qualification | AEC-Q100 Qualified |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
TPS2041BQDBVRQ1 腳位配置
| 腳位 1 | IN — Input supply voltage (2.7 V to 5.5 V); connect to upstream 5 V rail with local decoupling |
| 腳位 2 | GND — Ground reference |
| 腳位 3 | IN — Input supply voltage (internally bonded to pin 1) |
| 腳位 4 | EN — Active-low enable input; drive low to turn the switch on, high to disable |
| 腳位 5 | OUT — Switched output to load (USB VBUS or downstream rail) |
典型應用
TPS2041BQDBVRQ1 適用於 6 應用s: Automotive Head Unit USB Port Power Switching, Body Control Module (BCM) Load Switching, Rear-Seat Infotainment USB Hub, Telematics Control Unit (TCU) Power Rail Switching, Industrial 5 V Load Protection, USB Charging Port Downstream of LDO.
Automotive Head Unit USB Port Power Switching
The TPS2041BQDBVRQ1 sits between the head unit's internal 5 V rail and each USB VBUS pin, providing per-port overcurrent protection and fault isolation. Its AEC-Q100 qualification and -40 C to +125 C operating range handle the temperature extremes of an in-dash infotainment environment, while the 105 mΩ RDS(on) limits full-load conduction loss to roughly 53 mW per port. The active-low enable input simplifies interface to common USB power controllers that assert low to enable downstream power, and the built-in fault flag can drive a GPIO interrupt for diagnostic reporting on USB overcurrent events.
推薦
Body Control Module (BCM) Load Switching
In body control modules, the TPS2041BQDBVRQ1 provides protected high-side switching for individual downstream loads, isolating faults between branches such as interior lighting controllers, door modules, or sensor rails. The 1 A current limit prevents upstream automotive bus sagging during a downstream short, while the integrated thermal shutdown protects the SOT-23-5 package from sustained fault currents. The 2.7 V to 5.5 V input range rides through cold-crank transients on 12 V battery systems after regulation, making it a robust choice for distributed BCM architectures.
推薦
Rear-Seat Infotainment USB Hub
Each USB port in a rear-seat entertainment hub can be protected by a dedicated TPS2041BQDBVRQ1, giving per-port current limiting and fault indication to the host processor. The device's small SOT-23-5 footprint allows multiple switches to be placed in tight spaces behind the rear-seat display panel. The 500 mA continuous rating matches the USB 2.0 standard port current, and the 1 A current limit accommodates brief inrush events from downstream device hot-plug without nuisance tripping, while still protecting the wiring harness in a sustained fault.
推薦
Telematics Control Unit (TCU) Power Rail Switching
Telematics modules often need to selectively power-down sub-circuits when the vehicle is parked to limit battery drain, and the TPS2041BQDBVRQ1 provides the controllable high-side switch for those rails. The active-low enable input allows the TCU's microcontroller to assert low during sleep mode to fully disconnect downstream 5 V loads, drawing essentially zero quiescent current from the switched rail. The AEC-Q100 qualification and wide temperature range suit the under-dash or roof-mounted TCU installation environment.
推薦
Industrial 5 V Load Protection
Beyond automotive, the TPS2041BQDBVRQ1 also fits industrial 5 V load-protection applications where its 105 mΩ RDS(on) and 1 A current limit provide efficient, fault-isolated power switching. PLCs, sensor hubs, and HMI panels benefit from the same per-port current-limit architecture used in USB designs. The wide 2.7 V to 5.5 V input range allows the device to operate directly from a regulated 5 V industrial bus or from the output of a 3.3 V LDO with margin.
推薦
USB Charging Port Downstream of LDO
The TPS2041BQDBVRQ1 can be placed between a 5 V LDO and a USB charging port to provide a second layer of fault isolation in addition to the LDO's current limit. This two-stage protection architecture allows the LDO to source average load while the TPS2041BQDBVRQ1 handles the instantaneous fault current and limits peak dissipation. The fault flag output can interrupt the system MCU to log or display the USB fault condition for service diagnostics.
推薦
推薦產品摘要
工程參考資料，適用於 TPS2041BQDBVRQ1 — 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 | TPS2041BDBVR | TPS2042BQDBVRQ1 | TPS2051BQDBVRQ1 | TPS2041BQDBVRQ1G4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Number of Channels | 1 | 1 | 2 | 1 | 1 |
| Continuous Load Current | 500 mA | 500 mA | 500 mA per channel | 500 mA | 500 mA |
| On-Resistance (typ) | 105 mΩ | 80 mΩ | 105 mΩ | 105 mΩ | 105 mΩ |
| Current Limit (typ) | 1 A | 0.9 A | 1 A per channel | 1 A | 1 A |
| Enable Polarity | Active-Low | Active-Low | Active-Low | Active-High | Active-Low |
| AEC-Q100 Qualified | Yes | No | Yes | Yes | Yes |
主要差異化特點
- AEC-Q100 qualified for automotive USB power switching (對比TPS2041BDBVR)
- Dual-channel option available in same footprint (對比TPS2042BQDBVRQ1)
- Active-low enable polarity for USB controller compatibility (對比TPS2051BQDBVRQ1)
設計說明
Estimated: At VIN=5 V, VOUT drop ~0.05 V (RDS(on)*I), and 500 mA continuous load, the steady-state power dissipation is roughly 0.13 W. The SOT-23-5 (DBV) package has a typical theta_JA around 220 C/W on a standard JEDEC 1-square-inch 2-oz copper test board, yielding a junction temperature rise of approximately 28 C above ambient at 500 mA. Confirm against the manufacturer's thermal curve in the datasheet for your specific PCB copper area; reduce load or improve copper pour if Tj approaches 125 C.
Place a low-ESR ceramic bypass capacitor of at least 1 µF as close as possible to the IN pin (pin 1 and pin 3, which are internally bonded). Add a 0.1 µF ceramic in parallel for high-frequency decoupling of the upstream 5 V rail. The OUT pin should also have a local bulk capacitor (typically 1 µF to 10 µF) to limit inrush currents when the switch closes into a capacitive load. Keep the GND trace short and wide to minimize ground bounce during load transients.
Do not drive the EN pin with a floating signal; if left open, the internal pull-up keeps the switch disabled, but a floating enable can pick up noise and cause intermittent turn-on. Verify that the upstream supply does not exceed 5.5 V during load-dump transients - this part is designed for post-regulator 5 V rails, not direct 12 V battery connection. Ensure the load capacitance on OUT does not exceed the datasheet's recommended maximum, otherwise the inrush current at switch turn-on can trip the current-limit circuit prematurely.
合規資訊
AEC-Q100 automotive qualified per TI -Q1 designation. RoHS and lead-free compliant per TI product page. REACH compliance not explicitly listed; treated as compliant by default under TI's standard declaration. Halogen-free status not stated in available data.
