TLF11251LDXUMA1 - 2.5A Half-Bridge Gate Driver for AURIX | Infineon
MPN: TLF11251LDXUMA1 ✓ Hoạt độngTLF11251LDXUMA1 Tóm tắt
A half-bridge gate driver is a power-management IC that translates low-current logic-level PWM signals from a microcontroller into the high-current gate-drive signals required to switch the high-side and low-side MOSFETs of a synchronous buck or boost converter. In the broader power-management hierarchy, the TLF11251 sits between the microcontroller (control layer) and the discrete power MOSFETs (switching layer), making it a critical glue device in DC-DC converter sub-systems. Without a dedicated driver, a microcontroller GPIO pin cannot directly charge and discharge a power MOSFET gate fast enough for efficient high-frequency switching.
Key specifications include a 3.5 V to 7 V supply range, 2.5 A peak output drive, 60 ns propagation delay matching between high-side and low-side channels, and integrated shoot-through protection that prevents both MOSFETs from conducting simultaneously. The non-inverting input logic simplifies PWM signal routing, and the exposed thermal pad keeps junction temperature low during continuous switching. The driver is qualified to AEC-Q100 for automotive under-hood and chassis applications.
The TLF11251 is specifically engineered to pair with Infineon's AURIX TC38x and TC39x 32-bit TriCore microcontrollers, providing the gate-drive stage for downstream buck converters that power the MCU core, ADC, and communication peripherals. The tight propagation-delay matching supports the dead-time control required by the OPTIREG TLF35584/85 PMIC family. Internal shoot-through protection and under-voltage lockout (UVLO) on the driver supply safeguard the power stage during cold-crank and load-dump transients typical of 12 V automotive electrical systems.
Typical applications include 12 V automotive DC-DC converters, AURIX TC38x/TC39x ECU power stages, body-control modules, ADAS sensor power rails, and industrial 24 V buck regulators. The 2.5 A drive strength is sufficient for switching most sub-100 V N-channel MOSFETs commonly used in point-of-load converters up to approximately 10 A load.
When designing with this part, place the bootstrap capacitor for the high-side channel as close as possible to the BST and SW pins to minimize switching losses. The exposed pad must be soldered to a sufficiently large copper pour to keep junction temperature within the -40 C to +125 C automotive grade-A operating range. This page synthesizes distributor pricing, parametric comparisons, and practical PCB-layout guidance not collected in a single Infineon document.
Bộ thay thế dễ dàng lắp đặt cho TLF11251LDXUMA1 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TLF11251LDXUMA1 (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature Range, Function, Input Logic Compatibility, Automotive Qualification.
TLF11251EPXUMA1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →2ED21844S06JXUMA1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →1EDN7126GXTMA1
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Xem tài liệu →TLF11251LDXUMA1 Tỷ lệ tối đa & tính chất điện
| Chức năng | Half-Bridge Gate Driver |
| Cấu hình đầu ra | Half-Bridge (1 high-side + 1 low-side) |
| Kiểu đầu ra | Non-Inverting |
| Peak Output Current | 2.5 A (source/sink) |
| Thời gian tăng lên | 60 ns (typical) |
| Thời gian giảm dần | 60 ns (typical) |
| Supply Voltage Range | 3.5 V to 7 V |
| Number of Drivers | 1 (half-bridge) |
| Input Logic Compatibility | CMOS / TTL (non-inverting) |
| Nhiệt độ hoạt động | -40 C to +125 C (AEC-Q100 Grade 1) |
| Hộp | PG-TSON-10-2 (10-pin TSON with exposed pad) |
| Kiểu lắp đặt | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| Trạng thái RoHS | Compliant |
| Protection Features | Shoot-through protection, UVLO |
Cấu hình chân TLF11251LDXUMA1
| Chân 1 | GND — Ground reference |
| Chân 2 | IN — PWM logic input (non-inverting) |
| Chân 3 | VCC — Driver supply voltage (3.5 V to 7 V) |
| Chân 4 | NC — Not connected |
| Chân 5 | NC — Not connected |
| Chân 6 | BST — Bootstrap supply for high-side driver |
| Chân 7 | SW — Switching node (connected to high-side source) |
| Chân 8 | HO — High-side gate-drive output |
| Chân 9 | LO — Low-side gate-drive output |
| Chân 10 | EP — Exposed thermal pad (connect to GND) |
Ứng dụng tiêu biểu
TLF11251LDXUMA1 phù hợp cho 6 Áp dụngs: AURIX TC38x/TC39x ECU Power Stage, 12 V Automotive Buck DC-DC Converter, Body Control Module Power Supply, ADAS Sensor Power Rail, Industrial 24 V Buck Regulator, Electric Power Steering (EPS) Auxiliary Rail.
AURIX TC38x/TC39x ECU Power Stage
The TLF11251LDXUMA1 is engineered as the companion gate driver for Infineon AURIX TC38x and TC39x 32-bit TriCore microcontrollers used in automotive ECUs. Its 2.5 A peak output current and 60 ns rise/fall times switch the high-side and low-side N-channel MOSFETs of the 12 V buck converter that powers the MCU core rail, ADC supply, and CAN/LIN transceivers. The tight propagation-delay matching between the two channels (typically within 5 ns) prevents shoot-through current, which is critical when the converter operates near the 2 MHz switching frequency demanded by AURIX power-sequencing requirements. AEC-Q100 Grade 1 qualification ensures reliable operation across cold-crank and load-dump transients.
Được đề xuất
12 V Automotive Buck DC-DC Converter
In a synchronous buck converter powered directly from the 12 V automotive battery, the TLF11251LDXUMA1 drives the high-side and low-side MOSFETs to deliver 3.3 V or 5 V rails for body-control modules. The driver's 3.5 V to 7 V supply range is well-matched to a 5 V regulated intermediate rail, and its integrated UVLO protects the power stage during cold-crank events when the battery voltage sags below 6 V. The 2.5 A drive strength supports load currents up to roughly 10 A using sub-30 V MOSFETs, while the exposed thermal pad of the PG-TSON-10-2 package keeps junction temperature within automotive limits at sustained switching frequencies of 200 kHz to 500 kHz.
Được đề xuất
Body Control Module Power Supply
Body control modules (BCMs) require multiple low-voltage rails to drive lighting, door locks, mirror actuators, and HVAC blower motors. The TLF11251LDXUMA1 provides the half-bridge switching stage for the main BCM buck converter that generates the 5 V standby rail from the 12 V battery. Its AEC-Q100 Grade 1 qualification and -40 C to +125 C operating range match the harsh thermal environment inside the cabin or door-pillar-mounted BCM enclosure. The driver's non-inverting input logic simplifies firmware generation on the BCM host microcontroller, while integrated shoot-through protection eliminates the risk of cross-conduction that could otherwise damage the power MOSFETs during PWM edge transitions.
Được đề xuất
ADAS Sensor Power Rail
Advanced Driver Assistance Systems (ADAS) such as radar, lidar, and forward-facing cameras demand low-noise, deterministic power rails to preserve signal integrity. The TLF11251LDXUMA1 drives the buck converter that generates the clean 3.3 V or 1.8 V supply for the radar MMIC and the high-speed SERDES links. Because the driver operates from a fixed 5 V supply rail with tight propagation-delay matching, the resulting switching node stays predictable, minimizing EMI that could couple into the radar receiver frontend. AEC-Q100 Grade 1 qualification is mandatory for ADAS modules, and the PG-TSON-10-2 package's small footprint fits within the size-constrained sensor housing.
Được đề xuất
Industrial 24 V Buck Regulator
Beyond automotive, the TLF11251LDXUMA1 can drive industrial 24 V PLC and factory-automation power supplies where its 7 V absolute-maximum supply rating is enforced by an external LDO or bootstrap regulator. Its 2.5 A peak drive handles power MOSFETs up to 100 V breakdown, supporting point-of-load converters that step 24 V down to 5 V or 3.3 V at 5-8 A load. The exposed thermal pad simplifies PCB thermal design in sealed IP67 enclosures where convection cooling is limited. Engineers should add a TVS diode on the supply rail to meet industrial surge standards such as IEC 61000-4-5.
Được đề xuất
Electric Power Steering (EPS) Auxiliary Rail
Electric power steering systems require redundant power conversion for the safety microcontroller and torque sensor. The TLF11251LDXUMA1 provides the half-bridge stage for an auxiliary buck converter that generates the isolated 5 V rail from the 12 V chassis bus. Its integrated shoot-through protection and UVLO are essential safety features that meet ASIL-B functional-safety targets when paired with the AURIX TC38x safety MCU. The driver's small PG-TSON-10-2 footprint is valuable in EPS units where PCB area is constrained by the steering-column mechanical envelope.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TLF11251LDXUMA1 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TLF11251EPXUMA1 | 2ED21844S06JXUMA1 | 1EDN7126GXTMA1 | IRS2004STRPBF | IRS2101STRPBF | IRS2104STRPBF |
|---|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TSON-10-2 | PG-TSON-10-2 (same) | PG-TSON-10-2 (same family) | PG-TSON-10-2 (same) | SOIC-8 | SOIC-8 | SOIC-8 |
| Configuration | Half-Bridge | Half-Bridge | Half-Bridge | Single Low-Side | Half-Bridge | Half-Bridge | Half-Bridge |
| Automotive Grade | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 | AEC-Q100 | Industrial | Industrial | Industrial |
| AURIX Pairing | TC38x / TC39x optimized | TC38x / TC39x optimized | Generic automotive | Generic automotive | Not automotive | Not automotive | Not automotive |
Bảo phân biệt quan trọng
- Purpose-built for AURIX TC38x/TC39x + TLF35584/85 ecosystems (vsIRS2004STRPBF)
- Integrated shoot-through protection in half-bridge configuration (vs2ED21844S06JXUMA1)
- Smallest PCB footprint in PG-TSON-10-2 for 2.5 A drive (vs1EDN7126GXTMA1)
Ghi chú thiết kế
Place the bootstrap capacitor (typically 100 nF X7R) for the high-side channel as close as possible to the BST and SW pins, keeping the loop area below 5 mm^2 to minimize switching losses. The exposed thermal pad must be soldered to a continuous copper pour of at least 25 mm^2 on the top layer, with thermal vias (0.3 mm drill, 1.0 mm pitch) connecting to inner-layer ground planes to keep junction temperature within the -40 C to +125 C AEC-Q100 Grade 1 envelope. Estimated: with 25 mm^2 of 1 oz copper, theta_JA is approximately 45 C/W; at 0.5 W dissipation the junction rises 22 C above ambient.
The TLF11251LDXUMA1 supply pin (VCC) must be decoupled with a 1 uF X7R ceramic capacitor placed within 2 mm of the pin, plus a 10 uF bulk capacitor on the 5 V rail. Internal UVLO disables the outputs when VCC falls below approximately 3.0 V, protecting the power MOSFETs from insufficient gate-drive voltage. Do not exceed 7 V on VCC or 7 V on BST-to-SW; add a TVS clamp (e.g., SMAJ5.0CA) on the supply rail if load-dump transients above 35 V are expected on the upstream 12 V battery rail.
A common mistake is routing the PWM logic signal directly above the SW switching node - this injects high dv/dt noise into the input and can cause double-pulsing. Keep the IN trace on the opposite side of the package from the SW node, surrounded by a ground guard ring. Also verify that the bootstrap diode (typically BAV99 or Schottky) is a fast-recovery type with reverse recovery below 50 ns; slow diodes cause the high-side gate to droop during long low-side ON times.
Estimated: at a 5 V supply, 200 kHz switching frequency, and 2.5 A peak gate current with 60 ns rise/fall times, the average power dissipation in the driver itself is approximately 0.15 W. With theta_JA of 45 C/W (assuming a standard JEDEC 4-layer test board with 25 mm^2 copper pour), the junction temperature rises only 7 C above ambient - well within the 125 C automotive limit. For continuous operation above 1 MHz switching frequency, expect dissipation to increase by approximately 3x and rerun the thermal calculation.
Thông tin tuân thủ
RoHS and REACH compliant per Infineon product page. AEC-Q100 Grade 1 qualified for automotive applications. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020.
