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Infineon Technologies TLF50251ELXUMA2
- Part No.:
- TLF50251ELXUMA2
- Manufacturer:
- Infineon Technologies
- Package:
- 14-LSSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
TLF50251ELXUMA2.pdf
- Description:
- IC REG BUCK 5V 500MA SSOP-14-1
- Quantity:
- Payment:
- Shipping:
Inventory:2,256
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Product details
Overview
TLF50251ELXUMA2 from Infineon is a 2.2 MHz, 500 mA step-down DC/DC regulator with integrated PMOS power switch, fixed 5 V output (±2% tolerance), ultra-low quiescent current (<45 µA), and automotive-grade operation from −40°C to +150°C junction temperature. It delivers regulated 5 V power for engine management, dashboard, braking, and infotainment systems under wide 4.75–45 V input conditions.
For engineers reviewing the TLF50251ELXUMA2 datasheet, TLF50251ELXUMA2 pinout, TLF50251ELXUMA2 application, or TLF50251ELXUMA2 equivalent, this page provides verified functional identity, validated PG-SSOP-14 pin mapping, confirmed automotive qualification (AEC-Q100), real-world efficiency behavior in PFM/PWM modes, and exact reset threshold adjust and synchronization interface implementation details.
Technical Context
The TLF50251ELXUMA2 implements current-mode PWM regulation with internal compensation, enabling high line transient rejection and stable loop performance without external compensation components. Its 2.2 MHz switching frequency supports compact 3.3–22 µH inductors and 10–50 µF output capacitors with ESR ≤0.100 Ω.
It features dual operating modes: PWM for full-load efficiency and PFM for light-load optimization-where internal control circuitry powers down between pulses to achieve <45 µA quiescent current. The device includes cycle-by-cycle current limiting, overtemperature shutdown, input undervoltage lockout, and a dedicated open-collector reset output (RO) with adjustable threshold via RTADJ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - eliminates need for external feedback resistors; ensures stable MCU/peripheral supply across automotive load transients. |
| Max Output Current | 500 mA continuous - supports multiple automotive ECUs (e.g., sensor interfaces, CAN transceivers) from single buck stage. |
| Input Voltage Range | 4.75 V to 45 V - accommodates cold-crank (4.75 V) and load-dump (45 V) events without external protection. |
| Quiescent Current | <45 µA at nominal battery voltage - enables always-on functionality in body electronics with minimal battery drain. |
| Switching Frequency | 2.2 MHz nominal - allows use of small, low-profile inductors (≥3.3 µH) and reduces EMI filtering burden in space-constrained modules. |
| Shutdown Current | <2 µA - enables deep-sleep power gating in gateway or domain controllers during vehicle sleep mode. |
| Reset Output | Open-collector RO with adjustable threshold (via RTADJ) - provides system-level power-on reset timing synchronized to regulated 5 V rail. |
Pinout & Package
TLF50251ELXUMA2 is housed in a thermally enhanced PG-SSOP-14 package with exposed pad, optimized for automotive PCB layouts requiring low thermal resistance (RthJA = 47 K/W, 2s2p JEDEC standard).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RO | Reset Output | Open-collector signal indicating valid 5 V output; requires external pull-up to enable system reset assertion. |
| 2, 3, 8, 12 N.C. | No Connect | Internally unconnected; may be left floating or tied to GND per layout best practice. |
| 4 SYNC | Synchronization Input | Accepts external clock (≤2.2 MHz) to align switching frequency; disabled in PFM mode. |
| 5 FREQ | Frequency Adjustment | Resistor-to-GND sets nominal switching frequency; must be sized near sync frequency when SYNC is active. |
| 6 RTADJ | Reset Threshold Adjust | Resistor divider sets reset deassertion voltage; connect to VCC if reset function unused. |
| 7 FB | Feedback Input | Direct connection to output capacitor; also supplies internal bias - no external resistor divider needed. |
| 9, 10 GND | Ground | Dual low-inductance ground paths; require broad, low-impedance copper pour to minimize noise and thermal rise. |
| 11 SWO | Buck Switch Output | Drain of integrated PMOS; connects directly to catch diode cathode and inductor - critical high-di/dt node. |
| 13 VS | Supply Voltage Input | Primary input (4.75–45 V); requires local ceramic decoupling close to pin due to high dV/dt transients. |
| 14 EN | Enable Input | Active-high logic control; <2 µA shutdown current enables precise power sequencing in multi-rail systems. |
| Exposed Pad | Thermal & Electrical Ground | Mandatory connection to GND plane and heatsink area via multiple vias - essential for RthJC = 10 K/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PMOS Power Switch | Eliminates external high-side MOSFET and gate driver, reducing BOM count and layout complexity in 5 V power rails. |
| PFM Mode at Light Load | Reduces quiescent current to <45 µA by disabling internal regulators between switching pulses - extends battery life in always-on modules. |
| 100% Duty Cycle Capability | Enables dropout operation down to VOUT + VDS(on), supporting start-stop systems where input may dip near 5.5 V. |
| Internal Soft-Start | Controls inrush current during startup, preventing output overshoot and protecting downstream 5 V logic and analog circuits. |
| AEC-Q100 Qualified | Validated for automotive applications (Grade 0: −40°C to +150°C Tj) - meets reliability and stress-test requirements for engine bay placement. |
Applications
| Dashboard Cluster | Engine Control Unit (ECU) |
|---|---|
|
Use Scenario: Powering microcontroller, display drivers, and CAN transceivers in instrument clusters with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying core logic and communication peripherals. Use Value: 2.2 MHz switching minimizes filter size and radiated emissions; ±2% output tolerance ensures reliable ADC reference and flash programming voltage. |
Use Scenario: Providing stable 5 V supply to engine sensors (MAP, crankshaft), injector drivers, and diagnostic interfaces in high-temperature environments. IC Role / Device Role / Timing Role: Main system regulator delivering clean, fault-tolerant 5 V under cold-crank and load-dump conditions. Use Value: 4.75–45 V input range and AEC-Q100 qualification ensure uninterrupted operation during extreme battery transients and under-hood thermal stress. |
| Braking System ABS/ESC | Infotainment Head Unit |
|
Use Scenario: Supplying safety-critical microcontrollers and solenoid drivers in anti-lock braking and electronic stability control modules. IC Role / Device Role / Timing Role: Redundant or primary 5 V regulator with integrated reset generator for fail-safe power monitoring. Use Value: Open-collector RO output with adjustable threshold enables configurable reset timing aligned to system boot sequence and watchdog supervision. |
Use Scenario: Powering audio DSPs, touch controllers, and USB PHYs in head units requiring low-noise, always-on standby capability. IC Role / Device Role / Timing Role: Standby regulator maintaining 5 V rail during vehicle sleep mode with <2 µA shutdown current. Use Value: Ultra-low quiescent current (<45 µA active, <2 µA shutdown) prevents parasitic battery drain over extended parking periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V automotive buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3–17 V input, 3.3/5 V selectable output, 3 MHz switching, no integrated reset generator. | Lacks AEC-Q100 qualification and automotive thermal rating (Tj max = 85°C); suited for industrial, not under-hood automotive. | Select only for non-automotive designs requiring higher switching frequency and output flexibility - not drop-in for TLF50251ELXUMA2. |
| LMQ66430QRNXTQ1 | 3.3–36 V input, 5 V fixed output, 2.1 MHz, integrated FET, AEC-Q100 Grade 1 (−40°C to +125°C). | Lower max junction temperature (125°C vs. 150°C); lacks SYNC and RTADJ pins - less flexible for timing-critical or reset-configurable systems. | Consider for cost-sensitive automotive body applications where 125°C suffices and reset adjustment is unnecessary. |
Compared with TPS62130ARGTR and LMQ66430QRNXTQ1, the TLF50251ELXUMA2 uniquely combines AEC-Q100 Grade 0 qualification, 150°C operation, integrated reset with threshold adjust, and synchronization capability - making it the only choice for engine bay and safety-critical 5 V regulation where thermal margin and system-level timing control are mandatory.
Availability
TLF50251ELXUMA2 is available at Aetrix Electronics and suitable for dashboard cluster power supplies, engine control unit (ECU) auxiliary rails, and braking system ABS/ESC modules requiring stable component supply across automotive production lifecycles.
Supply support for TLF50251ELXUMA2 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 manufacturer specializing in power management, automotive ICs, and security solutions, with global manufacturing and automotive qualification infrastructure.
The TLF50251ELXUMA2 belongs to Infineon's TLF family of automotive-qualified DC/DC regulators, designed specifically for robust, low-quiescent-current 5 V power delivery in harsh under-hood and safety-critical electronic control units.
FAQ
What is the maximum allowable input voltage for continuous operation?
The TLF50251ELXUMA2 supports continuous operation up to 45 V input, validated for automotive load-dump conditions per ISO 7637-2 Pulse 5a. Absolute maximum rating is 45 V; exceeding this risks permanent damage. Operation above 45 V-even briefly-requires external clamping.
Does the device require external compensation components for stability?
No. The TLF50251ELXUMA2 uses an internally compensated current-mode control loop. Stability is guaranteed with standard output capacitors (10–50 µF, ESR ≤0.100 Ω) and inductors (3.3–22 µH); no external compensation network is needed or supported.
How is the reset threshold adjusted, and what is its default value?
The reset threshold is set via a resistor divider on RTADJ. With RTADJ tied to VCC, reset asserts when VOUT drops below 4.65 V (typical). Connecting a resistor divider to GND lowers the threshold linearly; full details are in Section 6.2 of the datasheet.
Can the SYNC pin be left unconnected, and what happens if it is?
Yes, the SYNC pin can be left unconnected (high-impedance), and the device operates at its nominal 2.2 MHz frequency. If driven externally, SYNC must be a clean CMOS-level clock ≤2.2 MHz; floating SYNC may cause frequency jitter or instability and is not recommended.
TLF50251ELXUMA2 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:
- 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SSOP-14-1
TLF50251ELXUMA2 FAQ
1.How can I place an order for TLF50251ELXUMA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLF50251ELXUMA2 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 TLF50251ELXUMA2 reliable?
The price and inventory of TLF50251ELXUMA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLF50251ELXUMA2 is usually 5 days.
3.What payment methods are accepted for TLF50251ELXUMA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLF50251ELXUMA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLF50251ELXUMA2?
TLF50251ELXUMA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLF50251ELXUMA2 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 TLF50251ELXUMA2?
For technical support, including TLF50251ELXUMA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLF50251ELXUMA2 requirements.
6.How does Aetrix verify that TLF50251ELXUMA2 is sourced from the original manufacturer or authorized distributors?
All TLF50251ELXUMA2 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 TLF50251ELXUMA2 meets industry standards.
7.What is the process for return or replacement of TLF50251ELXUMA2?
All TLF50251ELXUMA2 units undergo pre-shipment inspection (PSI). If there is an issue with TLF50251ELXUMA2, 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 TLF50251ELXUMA2 part is unused and in its original packaging.
Return procedure for TLF50251ELXUMA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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