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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Infineon Technologies TLF50281ELXUMA3

Name: TLF50281ELXUMA3
Brand: Infineon Technologies
SKU: TLF50281ELXUMA3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLF50281ELXUMA3

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 14-LSSOP (0.154", 3.90mm Width) Exposed Pad

Datasheet:: TLF50281ELXUMA3.pdf

Description:: IC REG BUCK 5V 500MA SSOP-14

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TLF50281ELXUMA3 from Infineon is a 2.2 MHz automotive-grade buck regulator with integrated PMOS switch, delivering 500 mA at 5 V output (±2% tolerance), ultra-low quiescent current (<45 µA), and operation across 4.75–45 V input range. It integrates soft-start, reset generator, watchdog, synchronization input, and PFM/PWM dual-mode control for engine management and dashboard power rails.

For engineers reviewing the TLF50281ELXUMA3 datasheet, TLF50281ELXUMA3 pinout, TLF50281ELXUMA3 application, or TLF50281ELXUMA3 equivalent, key selection criteria include its AEC-Q100 qualification, 100% duty cycle capability, exposed-pad PG-SSOP-14 thermal performance, and integrated protection features (UVLO, overtemperature shutdown, cycle-by-cycle current limit).

Technical Context

The TLF50281ELXUMA3 implements current-mode PWM regulation with internal compensation, enabling fast line transient rejection and stable loop behavior without external compensation components. Its oscillator supports fixed 2.2 MHz operation or external synchronization via SYNC pin, while frequency adjustment is achieved through resistor-connected FREQ pin.

It embeds dual safety functions: a programmable reset generator (threshold adjustable via RTADJ) and a configurable watchdog (fast/slow mode selectable via WMSEL, with WI input and WO/RO open-drain outputs). All protections-including undervoltage lockout and thermal shutdown-are designed for continuous automotive ambient operation from −40°C to +150°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5.0 V ±2% - tightly regulated rail for MCU core/logic supply in automotive ECUs.
Max output current	500 mA - sufficient for mid-power infotainment subsystems or sensor clusters without external boost.
Input voltage range	4.75 V to 45 V - accommodates cold-crank (4.75 V) and load-dump (45 V) transients per ISO 7637-2.
Quiescent current	<45 µA - enables always-on functionality in body control modules with battery longevity.
Switching frequency	2.2 MHz (nominal) - permits use of ≤10 µH inductors and compact 1206/0805 MLCCs, reducing board area by >40% vs. 500 kHz designs.
Shutdown current	<2 µA - meets automotive "sleep mode" leakage requirements for gateway and telematics units.
Operating junction temp	−40°C to +150°C - qualified per AEC-Q100 Grade 0, supporting under-hood placement near engine control units.

Pinout & Package

TLF50281ELXUMA3 is housed in a thermally enhanced PG-SSOP-14 package with exposed pad (EP), optimized for high-power-density automotive PCB layouts. The EP must be soldered to a large copper pour connected to GND for effective heat dissipation (R_thJA = 47 K/W, 2s2p JEDEC condition).

Pin/Terminal	Circuit Role	Design Meaning
1 RO	Reset Output	Open-drain output; requires external pull-up; asserts low during V_OUT undervoltage or startup delay.
2 WO	Watchdog Output	Open-drain output; pulses low on watchdog timeout unless refreshed via WI; shares logic domain with RO.
3 WI	Watchdog Input	Edge-triggered refresh signal; falling edge resets watchdog timer; left floating → connect to GND.
4 SYNC	Synchronization Input	Accepts external clock (1.5–2.8 MHz); overrides internal oscillator; disabled in PFM mode.
5 FREQ	Frequency Adjustment	Resistor-to-GND sets nominal f_SW; value selected per Figure 12 in datasheet; not used if SYNC active.
6 RTADJ	Reset Threshold Adjust	Resistor divider from V_OUT to GND sets reset threshold (typically 4.65 V); connect to V_OUT if unused.
7 FB	Feedback Input	Direct connection to output capacitor; senses V_OUT for regulation; also powers internal bias circuitry.
8 WMSEL	Watchdog Mode Select	High = slow mode (≈1.6 s timeout); low = fast mode (≈200 ms); default to GND for EMC robustness.
9,10 GND	Ground	Dual low-inductance ground pins; require wide, short traces to thermal pad and system GND plane.
11 SWO	Buck Switch Output	Drain of integrated PMOS; connects to inductor and catch diode cathode; carries high di/dt switching current.
12 N.C.	Not Connected	No internal connection; may be left floating or tied to GND for mechanical stability.
13 VS	Supply Voltage Input	Main input rail (4.75–45 V); requires local 100 nF ceramic + bulk capacitor; feeds internal LDO for bias.
14 EN	Enable Input	Active-high logic; ≥2.0 V enables regulator; <0.8 V disables with <2 µA shutdown current.

Key Features

Feature	Design Value
Integrated PMOS power switch	Eliminates need for external high-side MOSFET and gate driver, reducing BOM count and layout complexity.
PFM mode at light load	Extends battery runtime in standby by disabling internal regulators between switching pulses, cutting I_Q to sub-µA levels.
100% duty cycle operation	Maintains regulation down to V_IN = V_OUT, critical for cold-crank scenarios where input drops to 4.75 V.
Programmable reset & watchdog	Configurable thresholds/timings via RTADJ and WMSEL/WI allow tailoring to ECU boot sequence and fault recovery logic.
Thermal shutdown with hysteresis	Shuts down at T_j ≥165°C and restarts at ≈150°C, preventing latch-up during sustained overload or poor heatsinking.

Applications

Dashboard Cluster Power

Engine Control Unit (ECU) Core Supply

Use Scenario: Powering TFT LCD drivers, microcontroller cores, and CAN transceivers in digital instrument clusters.

IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying noise-sensitive analog and digital domains with low ripple and fast transient response.

Use Value: 2.2 MHz switching minimizes conducted EMI in proximity to RF receivers; ±2% tolerance ensures reliable ADC reference stability.

Use Scenario: Providing stable 5 V rail to 32-bit MCU, flash memory, and sensor interface circuits in gasoline/diesel ECUs.

IC Role / Device Role / Timing Role: Main system regulator with integrated reset and watchdog for functional safety compliance (ASIL-B capable).

Use Value: AEC-Q100 Grade 0 rating and −40°C to +150°C operation enable direct mounting on ECU PCB near combustion chamber.

Braking System ABS Module

Automotive Infotainment Head Unit

Use Scenario: Generating 5 V for ABS controller MCU, solenoid drivers, and wheel speed sensor interfaces.

IC Role / Device Role / Timing Role: Safety-critical power stage with UVLO, thermal shutdown, and watchdog supervision for fail-safe operation.

Use Value: Cycle-by-cycle current limiting prevents damage during solenoid short-circuit faults; <2 µA shutdown current preserves battery during vehicle park mode.

Use Scenario: Powering audio DSP, touch controller, and display backlight drivers in head units with always-on connectivity.

IC Role / Device Role / Timing Role: High-efficiency intermediate regulator converting 12 V battery to clean 5 V for low-noise analog sections.

Use Value: PFM mode extends idle battery life; soft-start prevents inrush-induced brownout on shared 12 V bus during ignition-on transition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54560QPWPRQ1	4.5–60 V input, 500 mA, 2.2 MHz, no integrated watchdog/reset; uses external compensation.	Lacks safety monitors; requires additional ICs for ASIL-B systems; better suited for non-safety-critical body electronics.	Select when cost sensitivity outweighs functional safety integration and board space is less constrained.
MAX20004AATP+T	3.5–36 V input, 600 mA, 2.2 MHz, integrated reset but no watchdog; RoHS-compliant, AEC-Q100 Grade 1 (−40°C to +125°C).	Lower max junction temperature limits under-hood deployment; reset only-no independent watchdog channel.	Choose for cabin-mounted modules where ambient temperature stays below 125°C and watchdog is implemented externally.

Compared with TPS54560QPWPRQ1 and MAX20004AATP+T, the TLF50281ELXUMA3 uniquely combines AEC-Q100 Grade 0 operation, integrated watchdog *and* reset, and 100% duty cycle capability-making it optimal for space-constrained, safety-critical under-hood applications requiring single-chip power + monitoring.

Availability

TLF50281ELXUMA3 is available at Aetrix Electronics and suitable for automotive dashboard clusters, engine control units, braking system modules, and infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLF50281ELXUMA3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor leader specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and AEC-Q100 validation infrastructure.

The TLF50281ELXUMA3 belongs to Infineon's TLF automotive power regulator family, engineered specifically for harsh-environment ECU power conversion where integration of regulation, monitoring, and protection is mandatory.

FAQ

What is the purpose of the RTADJ pin, and how is it configured?

The RTADJ pin adjusts the reset threshold voltage via an external resistor divider from V_OUT to GND. For standard 5 V operation, a 100 kΩ resistor from RTADJ to V_OUT and 1.24 kΩ from RTADJ to GND sets a 4.65 V reset point. If unused, RTADJ must be tied to V_OUT to disable reset functionality and prevent floating node instability.

Can the TLF50281ELXUMA3 operate without external frequency-setting components?

Yes-the device operates at its nominal 2.2 MHz switching frequency without any external components on the FREQ pin. The FREQ pin is only required when fine-tuning f_SW (e.g., to avoid EMI bands) or when synchronizing to an external clock via the SYNC pin, in which case the FREQ resistor must be sized near the sync frequency.

How does the watchdog function interact with the reset generator?

The watchdog (WI/WO/WMSEL) and reset generator (RTADJ/RO) operate independently: the watchdog monitors software execution timing, while reset responds to V_OUT undervoltage or startup conditions. Their outputs (WO and RO) are both open-drain and may be wire-OR'd to a common system reset line, but their triggers and timeouts are electrically separate.

Is the exposed pad of the PG-SSOP-14 package required to be connected to GND?

Yes-the exposed pad is internally connected to GND and must be soldered to a large, low-thermal-resistance GND copper area on the PCB. Leaving it unconnected degrades thermal performance (R_thJA increases by >20 K/W) and risks thermal shutdown under 500 mA load at high ambient temperatures.

TLF50281ELXUMA3 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 14-LSSOP (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4.75V

Voltage - Input (Max):: 45V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 500mA

Frequency - Switching:: 2.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SSOP-14

TLF50281ELXUMA3 FAQ

1.How can I place an order for TLF50281ELXUMA3 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLF50281ELXUMA3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLF50281ELXUMA3 reliable?

The price and inventory of TLF50281ELXUMA3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLF50281ELXUMA3 is usually 5 days.

3.What payment methods are accepted for TLF50281ELXUMA3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLF50281ELXUMA3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLF50281ELXUMA3?

TLF50281ELXUMA3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLF50281ELXUMA3 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLF50281ELXUMA3?

For technical support, including TLF50281ELXUMA3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLF50281ELXUMA3 requirements.

6.How does Aetrix verify that TLF50281ELXUMA3 is sourced from the original manufacturer or authorized distributors?

All TLF50281ELXUMA3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLF50281ELXUMA3 meets industry standards.

7.What is the process for return or replacement of TLF50281ELXUMA3?

All TLF50281ELXUMA3 units undergo pre-shipment inspection (PSI). If there is an issue with TLF50281ELXUMA3, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLF50281ELXUMA3 part is unused and in its original packaging.

Return procedure for TLF50281ELXUMA3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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