TLF11251LDXUMA1 - 2.5A Half-Bridge Gate Driver for AURIX | Infineon
MPN: TLF11251LDXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.75 | $17.50 |
| 100 | $1.45 | $145.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $0.98 | $980.00 |
TLF11251LDXUMA1 Overview
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.
Drop-in alternatives for TLF11251LDXUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLF11251LDXUMA1 (same form factor and footprint) — differing in Package, Operating Temperature Range, Function, Input Logic Compatibility, Automotive Qualification.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLF11251EPXUMA1
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →2ED21844S06JXUMA1
✅ Drop-In✓ In Stock
$1.68 / Unit
View Datasheet →1EDN7126GXTMA1
✅ Drop-In✓ In Stock
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View Datasheet →TLF11251LDXUMA1 Maximum Ratings & Electrical Characteristics
| Function | Half-Bridge Gate Driver |
| Output Configuration | Half-Bridge (1 high-side + 1 low-side) |
| Output Type | Non-Inverting |
| Peak Output Current | 2.5 A (source/sink) |
| Rise Time | 60 ns (typical) |
| Fall Time | 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) |
| Operating Temperature | -40 C to +125 C (AEC-Q100 Grade 1) |
| Package | PG-TSON-10-2 (10-pin TSON with exposed pad) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| RoHS Status | Compliant |
| Protection Features | Shoot-through protection, UVLO |
TLF11251LDXUMA1 Pin Configuration
| Pin 1 | GND — Ground reference |
| Pin 2 | IN — PWM logic input (non-inverting) |
| Pin 3 | VCC — Driver supply voltage (3.5 V to 7 V) |
| Pin 4 | NC — Not connected |
| Pin 5 | NC — Not connected |
| Pin 6 | BST — Bootstrap supply for high-side driver |
| Pin 7 | SW — Switching node (connected to high-side source) |
| Pin 8 | HO — High-side gate-drive output |
| Pin 9 | LO — Low-side gate-drive output |
| Pin 10 | EP — Exposed thermal pad (connect to GND) |
Typical Applications
TLF11251LDXUMA1 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for TLF11251LDXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Purpose-built for AURIX TC38x/TC39x + TLF35584/85 ecosystems (vs IRS2004STRPBF)
- Integrated shoot-through protection in half-bridge configuration (vs 2ED21844S06JXUMA1)
- Smallest PCB footprint in PG-TSON-10-2 for 2.5 A drive (vs 1EDN7126GXTMA1)
Design Notes
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.
Compliance Information
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.
