TLF51801ELVXUMA1 - 10A Synchronous Buck Controller, 45V, AEC-Q100 | Infineon
MPN: TLF51801ELVXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.65 | $2.65 |
| 10 | $2.45 | $24.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.71 | $1,710.00 |
| 2,500 | $1.55 | $3,875.00 |
TLF51801ELVXUMA1 Overview
A PWM step-down (buck) controller is a type of switching voltage regulator that uses external MOSFETs as the power switches, a controller IC to drive those switches, and an LC output filter to deliver a lower regulated output voltage. Within the broader power-management hierarchy, the buck controller sits above integrated buck converters (which embed the switches) and below point-of-load regulators; it is chosen when load current exceeds integrated-converter capability, here up to 10 A, while still requiring controller-grade flexibility for switching frequency, current sense, and protection thresholds.
Key features include a 700 kHz nominal switching frequency, adjustable current limit via R_DS(on) sensing on the high-side switch, integrated bootstrap gate drive for the high-side n-MOSFET, and a 99% duty cycle that enables low-dropout operation near the input rail. The controller uses voltage-mode control with an external compensation network and includes an enable input, power-good output, and soft-start capability.
The architecture is built on a bipolar / BiCMOS process with a precision internal reference, allowing tight load and line regulation across the automotive temperature range. Synchronous rectification eliminates the need for an external Schottky diode at high-side, raising efficiency at high load currents and reducing thermal stress in compact modules.
Typical applications include automotive body and chassis ECUs, LED driver front-ends, industrial 24 V sensor and actuator rails, and any point-of-load conversion above 3 A that demands automotive-grade reliability and wide input-voltage tolerance. A 45 V abs-max input allows operation directly from 12 V and 24 V automotive buses with substantial transient margin.
When designing with this controller, select external MOSFETs with adequate safe-operating-area margin at worst-case VIN = 45 V and programmed peak current; the PG-SSOP-14 EP package dissipates gate-drive losses but the high-side / low-side FETs carry switching loss, so thermal design of the FETs is the dominant concern, not the IC itself.
This page synthesizes distributor pricing, AEC-Q100 qualification status, drop-in same-package alternatives, and practical design notes that complement, rather than duplicate, the manufacturer datasheet.
Drop-in alternatives for TLF51801ELVXUMA1 β 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 TLF51801ELVXUMA1 (same form factor and footprint) β differing in Package, Input Voltage Range, Operating Temperature Range, Output Current Capability, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLF51801ELV
β Drop-Inπ Reference alternative (not in catalog)
TLD5191ESXUMA1
β Drop-Inβ In Stock
$3.25 / Unit
View Datasheet βTLE9471ESXUMA1
β Drop-Inπ Reference alternative (not in catalog)
TLE44773LAXUMA1
β Drop-Inπ Reference alternative (not in catalog)
TLE94110ESXUMA1
β Drop-Inβ In Stock
$2.45 / Unit
View Datasheet βTLF51801ELVXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) Controller |
| Input Voltage Range | 4.75 V to 45 V |
| Output Current Capability | 10 A (with external MOSFETs) |
| Maximum Duty Cycle | 99% |
| Switching Frequency | 700 kHz (nominal) |
| External Switch Type | n-channel / n-channel MOSFET pair |
| Current Sensing | R_DS(on) of high-side switch |
| Operating Junction Temperature | -40 C to +150 C |
| Package | PG-SSOP-14 with Exposed Pad |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| Output Voltage | Adjustable (external divider) |
| Soft Start | Yes |
| Power Good Output | Yes |
| RoHS / Lead-Free | Compliant |
TLF51801ELVXUMA1 Pin Configuration
| Pin 1 | VIN β Supply input voltage |
| Pin 2 | EN β Enable input (active high) |
| Pin 3 | BOOT β Bootstrap capacitor for high-side gate drive |
| Pin 4 | HG β High-side gate drive output |
| Pin 5 | SW β Switch node (connection point of high-side source and low-side drain) |
| Pin 6 | LG β Low-side gate drive output |
| Pin 7 | PGND β Power ground |
| Pin 8 | SGND β Signal ground |
| Pin 9 | FB β Feedback voltage input (to external divider) |
| Pin 10 | COMP β Compensation network connection |
| Pin 11 | SS β Soft-start capacitor connection |
| Pin 12 | PGOOD β Power-good indicator output |
| Pin 13 | NC β Not connected (per datasheet) |
| Pin 14 | EP β Exposed pad - thermal and ground |
Typical Applications
TLF51801ELVXUMA1 is suitable for 7 applications: Automotive Body Control Module (BCM) Power Rail, Automotive LED Front-End Driver Supply, Industrial 24 V Sensor and Actuator Rail, Point-of-Load Power for Automotive ADAS Domain Controller, Battery-Buffered Always-On Rail, Two-Wheeler and Powersports ECU, Truck and Heavy-Duty 24 V Telematics Power.
Automotive Body Control Module (BCM) Power Rail
The TLF51801ELVXUMA1 fits 12 V and 24 V automotive BCM rails because its 4.75 V to 45 V input range survives load-dump transients up to 35 V and cranking dips down to 6 V. Its 99% duty cycle maintains regulation at very low V_IN minus V_OUT margins, and the 10 A output headroom supplies multiple downstream LDOs and transceivers on the BCM. AEC-Q100 qualification at -40 C to +150 C junction removes qualification overhead for tier-1 suppliers.
Recommended
Automotive LED Front-End Driver Supply
The TLF51801ELVXUMA1 is well suited as the front-end converter that steps a 12 V or 24 V automotive battery down to an intermediate rail (for example, 5 V or 12 V) that subsequently feeds an LED buck driver. The 700 kHz switching frequency keeps the input inductor compact, while AEC-Q100 qualification allows direct placement near headlamp PCBs. With external n-MOSFETs the design scales to the high currents required by high-beam and DRL LED strings.
Recommended
Industrial 24 V Sensor and Actuator Rail
The TLF51801ELVXUMA1 supports industrial 24 V bus systems where a regulated 5 V, 12 V, or 15 V rail is needed for sensors, PLC I/O, and small actuators. Its 45 V abs-max input tolerates 24 V industrial transients and inductive kickback, and the controller's flexibility to select external MOSFETs lets the designer optimize efficiency versus cost for the specific load profile. The exposed pad aids thermal dissipation in sealed industrial housings.
Recommended
Point-of-Load Power for Automotive ADAS Domain Controller
The TLF51801ELVXUMA1's 10 A capability suits ADAS domain controllers that must power processors, FPGAs, and serializer/deserializer ICs from a 12 V battery. The 700 kHz switching frequency pushes the fundamental EMI energy above the AM radio band, simplifying automotive EMC compliance. AEC-Q100 qualification at 150 C junction enables placement near processors where ambient temperature is elevated. External MOSFETs allow the designer to size silicon for the specific load.
Recommended
Battery-Buffered Always-On Rail
The TLF51801ELVXUMA1 can generate an always-on 3.3 V or 5 V rail from a 12 V battery for automotive wake-up ECUs and keyless-entry systems. Its low quiescent current and enable input allow the rail to be shut down in sleep mode, and the wide 4.75 V to 45 V input tolerates cranking dips and load-dump events without latch-up. The 14-pin PG-SSOP footprint fits alongside small-signal components on the same PCB.
Recommended
Two-Wheeler and Powersports ECU
The TLF51801ELVXUMA1 fits powersports and two-wheeler ECUs where the electrical environment is harsher than a passenger car: higher vibration, wider temperature swings, and unregulated alternators that produce voltage spikes up to 60 V. The 45 V abs-max and -40 C to +150 C junction temperature give substantial margin, and the controller's R_DS(on) current sensing protects the small external MOSFETs against short-circuit faults on the harness.
Recommended
Truck and Heavy-Duty 24 V Telematics Power
The TLF51801ELVXUMA1 operates directly from a 24 V truck electrical system without an upstream pre-regulator, saving BOM cost in telematics, fleet management, and tachograph units. Its 45 V abs-max covers the doubled load-dump transients seen on 24 V networks, and the controller's efficiency at moderate loads preserves battery life during long parking periods. The PG-SSOP-14 EP package simplifies the production-line rework compared with larger DPAK-based alternatives.
Recommended
Recommended Products Summary
Engineering reference data for TLF51801ELVXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLF51801ELV | TLD5191ESXUMA1 | TLE9471ESXUMA1 | TLE44773LAXUMA1 | TLE94110ESXUMA1 |
|---|---|---|---|---|---|---|
| Package | PG-SSOP-14-EP | PG-SSOP-14-EP (same) | PG-SSOP-14-EP (same) | PG-SSOP-14-EP (same) | PG-SSOP-14-EP (same) | PG-SSOP-14-EP (same) |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Topology | Synchronous Buck Controller | Synchronous Buck Controller | Buck-Boost Controller | Buck Controller | Integrated Buck Converter | Half-Bridge Driver |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Junction Temperature | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C |
Key Differentiators
- 10 A capability with R_DS(on) current sensing in PG-SSOP-14 EP (vs TLE44773LAXUMA1)
- Wide 4.75 V to 45 V input range with 99% duty cycle (vs TLD5191ESXUMA1)
- Synchronous rectification eliminates external Schottky (vs Non-synchronous buck controllers)
- AEC-Q100 qualification at 150 C junction (vs Commercial-grade buck controllers)
Design Notes
Estimated: at V_IN = 24 V, V_OUT = 5 V, I_OUT = 10 A, switching frequency 700 kHz, and efficiency approximately 92%, the external high-side and low-side MOSFETs together dissipate about 4.3 W. The IC itself only handles gate-drive loss (typically <200 mW). The PG-SSOP-14 EP package has a junction-to-ambient thermal resistance of roughly 40 C/W on a 2 oz 4-layer PCB with 1 sq inch of copper pour on the EP; design the FET thermal layout, not the IC pad, to manage the bulk of the heat.
Route the high-di/dt loop (input capacitor, high-side FET, low-side FET, and PGND return) as tightly and symmetrically as possible to minimize parasitic inductance. Place the BOOT capacitor close to pins BOOT and SW with a wide trace; a 100 nF X7R ceramic is typical. Keep the SGND and PGND separated and join them only at the exposed pad. Use at least four vias on the EP for thermal and ground return.
The feedback trace from the output sense point to the FB pin must be a Kelvin connection that does not share return current with the SW node or the load. According to Infineon reference layouts, place the output divider resistors close to the IC with the bottom of the divider tied directly to SGND. Place the COMP network components away from the SW node to avoid noise injection into the compensation loop.
Do not exceed 45 V on VIN even transiently - the abs-max rating applies to all transient events including load-dump. The R_DS(on) current-sense method assumes a known FET on-resistance that varies with temperature; for accurate current limit across the automotive temperature range, either use a sense resistor instead or de-rate the programmed limit. The enable pin must not be left floating; tie it high through a resistor if always-on operation is desired.
Switching at 700 kHz places the fundamental and harmonics above the AM broadcast band but inside FM and DAB-III bands. Use a pi-filter on the input, minimize the SW-node copper area, and consider spread-spectrum or frequency-dithering if conducted emissions margins are tight. According to Infineon application notes, a snubber across the low-side FET reduces ringing that contributes to radiated EMI in ECU enclosures.
Compliance Information
AEC-Q100 qualified per Arrow and Mouser listings. RoHS and lead-free status per Infineon product page. Halogen-free status not stated explicitly in the verified web data and is set to unknown.
