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Infineon Technologies TLF4949EJXUMA1
- Part No.:
- TLF4949EJXUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
TLF4949EJXUMA1.pdf
- Description:
- IC REG LIN 5V 100MA 8DSO E-PAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
TLF4949EJXUMA1 from Infineon is a monolithic 5 V low-dropout linear voltage regulator with integrated reset circuit, voltage sense comparator, and preregulator output-designed for automotive microcontroller supply. It operates from 5.5 V to 28 V DC input, delivers up to 100 mA output current, maintains ±1% output accuracy (4.95–5.05 V at 25°C), and features <0.5 V dropout at 100 mA load.
For engineers reviewing the TLF4949EJXUMA1 datasheet, TLF4949EJXUMA1 pinout, TLF4949EJXUMA1 application, or TLF4949EJXUMA1 equivalent, key selection criteria include AEC-Q100 qualification, programmable reset delay via external capacitor, thermal shutdown protection, and exposed-pad PG-DSO-8 package for enhanced thermal performance in engine control units and body electronics.
Technical Context
The TLF4949EJXUMA1 integrates three functional blocks: a precision LDO regulator with bandgap reference, an undervoltage reset monitor with adjustable delay (via external capacitor on pin D), and a dedicated voltage sense comparator (SI/SO) for system-level supply monitoring. Its preregulator output (PRE) provides auxiliary 7 V/5 mA capability for biasing external circuits.
It operates across -40°C to +125°C junction temperature, supports transient input up to 40 V for <1 s, and includes foldback current limiting (120–400 mA), open-collector reset (RO) and sense (SO) outputs, and thermal shutdown at 165°C-enabling robust operation in automotive power domains where supply stability and fault resilience are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5 V ±1% (4.95–5.05 V at 25°C); ensures stable MCU core voltage under varying load and temperature |
| Dropout voltage | ≤0.5 V at 100 mA; enables regulation down to VIN = 5.5 V, critical for cold-crank automotive conditions |
| Quiescent current | 300 µA typical at 0.3 mA load; minimizes standby power loss in always-on vehicle modules |
| Reset delay | Programmable via external capacitor on pin D; allows precise POR timing alignment with MCU boot sequence |
| Thermal resistance | RthJC = 19 K/W (exposed pad); enables >1 W continuous dissipation with 300 mm² PCB copper area |
| Input voltage range | 5.5–28 V normal operation; supports 40 V transients (<1 s); meets ISO 7637-2 pulse 5a requirements |
| Sense comparator | VSI range: -30 to +40 V; monitors external rail (e.g., battery or pre-LDO stage) with fail-safe SO output |
Pinout & Package
TLF4949EJXUMA1 uses the PG-DSO-8 exposed pad package (8-pin, 6×4.9 mm, 0.65 mm pitch), with the exposed pad (EP) thermally and electrically connected to GND for improved heat dissipation and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Main input supply | Accepts 5.5–28 V DC; requires local 100 nF ceramic capacitor to GND for high-frequency decoupling |
| 2 SI | Voltage sense input | Monitors external rail (e.g., battery); threshold set internally; connects to OUT if unused |
| 3 PRE | Preregulator output | Provides 7 V/5 mA for biasing external circuits; not regulated-requires external filtering |
| 4 D | Reset delay capacitor node | Connects to GND via external capacitor (e.g., 100 nF → ~100 ms delay); sets POR timing window |
| 5 GND | Power and signal ground | Reference for all voltages; must be low-impedance connection to EP and system ground plane |
| 6 RO | Reset output | Open-collector; pulls low during undervoltage condition; requires external pull-up to MCU VDD |
| 7 SO | Sense output | Open-collector; asserts low when SI falls below threshold; enables dual-rail monitoring |
| 8 OUT | Regulated 5 V output | Delivers up to 100 mA; requires ≥4.7 µF output capacitor (ESR <10 Ω) for stability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (-40°C to +125°C), validated for automotive powertrain and chassis systems |
| Integrated reset with programmable delay | Eliminates external RC timing network; enables precise, repeatable power-on reset sequencing |
| Voltage sense comparator | Independent monitoring of secondary supply rail (e.g., 12 V battery) without loading it |
| Exposed thermal pad (EP) | Reduces RthJA to 52 K/W (vs. 116 K/W for non-exposed variant), enabling higher ambient operating temperature |
| Foldback current limiting | Reduces short-circuit power dissipation by lowering output current as VOUT collapses, improving fault survivability |
Applications
| Engine Control Unit (ECU) Power Supply | Body Control Module (BCM) Microcontroller Bias |
|---|---|
Use Scenario: Powers 32-bit MCU and CAN transceiver in gasoline/diesel engine management systems under cold-crank (5.5 V) and load-dump (40 V) conditions. IC Role / Device Role / Timing Role: Primary 5 V LDO with POR reset and battery sense; synchronizes MCU boot with stable VDD and validates main battery health before initialization. Use Value: ±1% output accuracy ensures ADC reference stability; 0.5 V dropout preserves regulation during cranking; sense comparator detects battery disconnection prior to MCU wake-up. | Use Scenario: Supplies door module MCU, LIN transceiver, and LED drivers in 12 V vehicle architecture with intermittent sleep/wake cycles. IC Role / Device Role / Timing Role: Always-on LDO with ultra-low IQ (300 µA) and programmable reset delay; holds MCU in reset until post-buck converter stabilizes. Use Value: Quiescent current <300 µA extends battery life in parked state; exposed pad enables 100% duty-cycle operation at 85°C ambient without derating. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Electric Power Steering (EPS) Motor Controller Logic Supply |
Use Scenario: Provides clean 5 V rail to image sensor ISP and real-time vision processor in front-facing camera module. IC Role / Device Role / Timing Role: Precision LDO with low noise and high PSRR; reset output triggers sensor reinitialization after brownout detection. Use Value: Output voltage tolerance ±1% prevents ISP clock jitter; SO output flags battery sag before image corruption occurs; thermal shutdown protects against enclosure overheating. | Use Scenario: Supplies gate driver logic and position sensor interface in EPS motor controller exposed to under-hood temperatures up to 125°C. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown and foldback current limit; PRE output biases isolated gate driver bias supply. Use Value: RthJC = 19 K/W sustains 100 mA output at Tj = 125°C; foldback limit prevents latch-up during MOSFET shoot-through faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO with reset and sense applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLF4949SJXUMA1 | No exposed thermal pad; RthJA = 116 K/W vs. 52 K/W; same electrical specs and pinout | Suitable for lower-power modules (<50 mA) or cooler ambient zones (e.g., cabin) | Select when thermal budget permits higher junction temperature rise and PCB space for heatsinking is limited |
| NCP1117ST50T3G | No reset, no sense, no preregulator; fixed 5 V output; only basic LDO functionality | Lacks system-monitoring features; requires external reset IC and voltage supervisor | Choose only for cost-sensitive non-safety-critical applications where full TLF4949 feature set is unnecessary |
Compared with TLF4949SJXUMA1, the TLF4949EJXUMA1 offers superior thermal performance for high-load automotive environments, while NCP1117ST50T3G omits critical safety and monitoring functions required for ASIL-B compliant designs-making TLF4949EJXUMA1 the only drop-in solution for reset-aware, thermally demanding ECUs.
Availability
TLF4949EJXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering logic supplies requiring stable component supply, AEC-Q100 compliance, and automotive-grade thermal reliability.
Supply support for TLF4949EJXUMA1 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 electronics, and security solutions, with global R&D and manufacturing infrastructure.
The OPTIREG™ linear product line delivers AEC-Q100-qualified voltage regulators optimized for automotive subsystems requiring high precision, fault resilience, and thermal robustness-including engine, chassis, and ADAS domains.
FAQ
What is the maximum allowable input voltage for continuous operation?
The TLF4949EJXUMA1 supports continuous operation from 5.5 V to 28 V DC input. Input voltages up to 40 V are permitted only as transients lasting less than 1 second-such as load dump events-and require careful thermal design to avoid exceeding the 165°C junction shutdown threshold.
How is the reset delay time configured?
The reset delay is set by connecting an external capacitor between pin D and GND. The delay time scales approximately linearly with capacitance-for example, a 100 nF capacitor yields ~100 ms delay. No resistor is needed; the internal current source charges the capacitor to generate the timed reset release.
Can the sense comparator (SI/SO) monitor a 12 V rail directly?
Yes-the SI pin accepts input voltages from -30 V to +40 V, allowing direct connection to a 12 V battery rail without attenuation. The internal comparator threshold is fixed; SO asserts low when SI falls below the trip point, enabling battery undervoltage detection independent of the 5 V output rail.
Is the exposed pad (EP) electrically connected to GND?
Yes-the exposed pad is internally bonded to the GND terminal and must be soldered to a PCB copper pour tied to system ground. This connection is mandatory for both thermal performance (RthJC = 19 K/W) and electrical stability; floating the pad degrades thermal resistance by >100% and may cause oscillation.
TLF4949EJXUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- OPTIREG™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 3.6 mA
- PSRR:
- -
- Control Features:
- Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-DSO-8
TLF4949EJXUMA1 FAQ
1.How can I place an order for TLF4949EJXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLF4949EJXUMA1 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 TLF4949EJXUMA1 reliable?
The price and inventory of TLF4949EJXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLF4949EJXUMA1 is usually 5 days.
3.What payment methods are accepted for TLF4949EJXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLF4949EJXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLF4949EJXUMA1?
TLF4949EJXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLF4949EJXUMA1 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 TLF4949EJXUMA1?
For technical support, including TLF4949EJXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLF4949EJXUMA1 requirements.
6.How does Aetrix verify that TLF4949EJXUMA1 is sourced from the original manufacturer or authorized distributors?
All TLF4949EJXUMA1 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 TLF4949EJXUMA1 meets industry standards.
7.What is the process for return or replacement of TLF4949EJXUMA1?
All TLF4949EJXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLF4949EJXUMA1, 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 TLF4949EJXUMA1 part is unused and in its original packaging.
Return procedure for TLF4949EJXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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