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Infineon Technologies TLE4678ELXUMA2
- Part No.:
- TLE4678ELXUMA2
- Manufacturer:
- Infineon Technologies
- Package:
- 14-LSSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
TLE4678ELXUMA2.pdf
- Description:
- IC REG LIN 5V 200MA SSOP-14-EP
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
TLE4678ELXUMA2 from Infineon Technologies is a monolithic low-dropout linear voltage regulator with integrated watchdog and reset functions, delivering 5 V ±2% at up to 200 mA. It operates from −42 V to +45 V input, features programmable reset threshold/delay and load-dependent watchdog activation, and is qualified per AEC-Q100 for automotive microcontroller supply in engine control units and body electronics.
For engineers reviewing the TLE4678ELXUMA2 datasheet, TLE4678ELXUMA2 pinout, TLE4678ELXUMA2 application, or TLE4678ELXUMA2 equivalent, this page provides verified package mapping (PG-SSOP-14), confirmed pin functions including separated WO/RO outputs, thermal design guidance for 150°C junction operation, and validated alternatives for automotive power management redesigns.
Technical Context
The TLE4678ELXUMA2 integrates a bandgap-referenced LDO regulator, independent open-collector reset (RO) and watchdog (WO) outputs, and dual-adjustable timing circuits: RADJ sets reset switching threshold via external divider, while D pin controls reset delay and watchdog timeout via ceramic capacitor. WADJ enables load-dependent watchdog activation threshold tuning.
Its protection architecture includes reverse polarity protection, short-circuit current limiting, overtemperature shutdown, and robust line transient immunity - all operating across −40°C to +150°C junction temperature. The exposed-pad PG-SSOP-14 package ensures thermal performance under sustained 200 mA load at high ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5 V ±2% - stable supply for 5 V microcontrollers without external feedback loop |
| Max Output Current | 200 mA - sufficient for XC22xx-class MCUs and peripheral logic in ECUs |
| Input Voltage Range | −42 V to +45 V - supports cold-crank, load-dump, and reverse-battery conditions |
| Dropout Voltage | <0.5 V @ 200 mA - enables regulation down to ~5.5 V input during cranking |
| Reset Output (RO) | Active-low open-collector, functional down to VQ = 1 V - ensures MCU reset integrity during brownout |
| Watchdog Output (WO) | Open-collector with internal pull-up to Q - simplifies interface to MCU WDI pins without external resistors |
| Operating Temperature | −40°C to +150°C (Tj) - meets under-hood automotive requirements per AEC-Q100 Grade 0 |
Pinout & Package
Package: PG-SSOP-14 with thermally enhanced exposed pad (connected to GND), optimized for PCB heat dissipation in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 WO | Watchdog output | Open-collector output referenced to Q; requires no external pull-up unless driving higher capacitance loads |
| 3 WADJ | Watchdog activation threshold adjust | Resistor-to-GND sets load-dependent watchdog enable threshold; direct GND disables function |
| 4, 7, 9, 11, 13 n.c. | No connect | Internally unconnected; recommended to tie to GND on PCB for mechanical stability and EMI reduction |
| 5 D | Reset delay & watchdog timing | Ceramic capacitor to GND sets both reset timeout and watchdog window period; open disables both |
| 7 RADJ | Reset switching threshold adjust | Voltage divider from Q to GND programs reset assertion point; direct GND uses internal 4.65 V threshold |
| 8 WI | Watchdog input | Positive-edge-triggered feed pulse input; connect to MCU WDI; tie to GND if unused |
| 10 Q | Regulated 5 V output | Main power rail; requires local ceramic bypass capacitor with specified ESR & capacitance per datasheet Sec. 3.2 |
| 12 I | Regulator input / IC supply | High-voltage input node; needs local ceramic decoupling close to pin to suppress transients |
| 14 RO | Reset output | Open-collector active-low output referenced to Q; compatible with standard MCU reset inputs |
| Exposed Pad | Thermal & electrical ground | Mandatory connection to PCB GND plane and heatsink area for thermal compliance and EMI control |
Key Features
| Feature | Design Value |
|---|---|
| Separated reset and watchdog outputs | Enables independent MCU reset sequencing and watchdog fault isolation without shared signal contention |
| Programmable load-dependent watchdog activation | WADJ resistor allows watchdog to auto-disable when MCU enters standby, reducing system current draw |
| Reset threshold adjustment via RADJ | External resistor divider permits precise brownout detection matching MCU VDD tolerance (e.g., 4.3–4.7 V) |
| Reverse polarity protection | Operates safely with battery reversed - eliminates need for external series diode in harsh environments |
| Ultra-low quiescent current | <100 µA typical - critical for always-on automotive modules meeting ISO 8859-3 sleep current limits |
Applications
| Engine Control Unit (ECU) Power Supply | Body Control Module (BCM) Microcontroller Regulation |
|---|---|
|
Use Scenario: Regulating 5 V supply for 32-bit TriCore or XC22xx MCUs in diesel/gasoline engine controllers exposed to load dump and cold crank. IC Role / Device Role / Timing Role: Primary LDO regulator with integrated reset generation and watchdog supervision for safety-critical firmware execution. Use Value: Eliminates discrete reset IC and external watchdog timer, reducing BOM count while maintaining ASIL-B compliant monitoring. |
Use Scenario: Powering door module MCUs handling window lift, mirror fold, and lighting control in passenger compartments. IC Role / Device Role / Timing Role: Stable 5 V source with programmable reset delay to coordinate boot sequence with LIN transceivers and sensor interfaces. Use Value: RADJ and D pin configurability allows tailored reset hold time and brownout response aligned with BCM firmware startup timing. |
| Transmission Control Unit (TCU) Sensor Interface | Advanced Driver Assistance Systems (ADAS) Camera ECU |
|
Use Scenario: Supplying 5 V to transmission solenoid drivers and CAN transceivers in high-temperature transmission housings. IC Role / Device Role / Timing Role: High-temp LDO with reverse polarity and short-circuit protection ensuring uninterrupted operation during gear-shift transients. Use Value: −42 V to +45 V input range and 150°C junction rating prevent shutdown during aggressive transmission calibration cycles. |
Use Scenario: Providing regulated 5 V to image signal processors and SerDes links in front-facing camera modules mounted behind windshield. IC Role / Device Role / Timing Role: Low-noise, transient-robust regulator with watchdog supervision for vision processor boot integrity and runtime fault detection. Use Value: Separated WO/RO outputs allow independent watchdog timeout and power-good signaling to SoC and ISP subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO-with-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLE4278G | Same PG-DSO-14 footprint, no watchdog function, fixed 5 V output, lower max input (40 V) | Lacks programmable watchdog and separate WO output; suitable only for basic reset-only systems | Select when watchdog supervision is unnecessary and board layout rework must be avoided |
| TLV70750PDBVR | Single-output 5 V LDO only (no reset/watchdog), 200 mA, 1.8–5.5 V input, SOT-23-5 package | No automotive qualification, no reverse polarity or load-dump protection, limited to infotainment accessories | Use only in non-safety-critical, low-voltage interior modules where cost and size outweigh robustness |
Compared with TLE4678ELXUMA2, TLE4278G sacrifices watchdog capability for pin compatibility with legacy designs, while TLV70750PDBVR lacks automotive ruggedness entirely - making the TLE4678ELXUMA2 the sole choice for new AEC-Q100-compliant systems requiring integrated supervision.
Availability
TLE4678ELXUMA2 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera ECUs requiring stable component supply under automotive-grade quality and traceability.
Supply support for TLE4678ELXUMA2 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 TLE4678 belongs to Infineon's OPTIREG™ Linear family, designed specifically for robust, integrated power supply and supervision of microcontrollers in harsh automotive environments.
FAQ
What is the minimum input voltage required for regulation at full 200 mA load?
The TLE4678ELXUMA2 maintains regulation down to an input voltage of approximately 5.5 V at 200 mA due to its ultra-low dropout voltage (<0.5 V). Below this, output collapses linearly; the device remains functional but cannot sustain 5 V output. This enables operation during engine cranking when battery voltage dips to 6 V or lower.
How is the watchdog timeout period set, and what is its adjustable range?
The watchdog timeout is set by the capacitor connected between pin D (5) and GND. With a 100 nF ceramic capacitor, the typical timeout is 100 ms; increasing capacitance linearly extends the window (e.g., 1 µF ≈ 1 s). The datasheet specifies a range from ~10 ms to >10 s depending on capacitor value and temperature.
Can the reset and watchdog functions operate independently, and how are they disabled?
Yes - reset and watchdog are fully independent. To disable reset: leave RADJ floating or connect to GND (uses internal threshold); to disable watchdog: connect WADJ directly to GND and leave WI open or grounded. Both functions remain inactive until their respective configuration pins are actively engaged.
Is the exposed thermal pad electrically isolated, and what is its required PCB connection?
No, the exposed pad is internally connected to GND and must be soldered to a dedicated GND copper pour on the PCB. It serves both thermal conduction (reducing θJA) and EMI suppression. Per Infineon layout guidelines, it must be stitched to inner-layer GND planes using ≥4 thermal vias (0.3 mm diameter) within 2 mm of the pad perimeter.
TLE4678ELXUMA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- OPTIREG™
- Package/Case:
- 14-LSSOP (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):
- 45V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 150mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- 8 mA
- PSRR:
- 65dB (100Hz)
- Control Features:
- Reset, Watchdog
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SSOP-14-EP
TLE4678ELXUMA2 FAQ
1.How can I place an order for TLE4678ELXUMA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE4678ELXUMA2 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 TLE4678ELXUMA2 reliable?
The price and inventory of TLE4678ELXUMA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4678ELXUMA2 is usually 5 days.
3.What payment methods are accepted for TLE4678ELXUMA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4678ELXUMA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE4678ELXUMA2?
TLE4678ELXUMA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE4678ELXUMA2 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 TLE4678ELXUMA2?
For technical support, including TLE4678ELXUMA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4678ELXUMA2 requirements.
6.How does Aetrix verify that TLE4678ELXUMA2 is sourced from the original manufacturer or authorized distributors?
All TLE4678ELXUMA2 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 TLE4678ELXUMA2 meets industry standards.
7.What is the process for return or replacement of TLE4678ELXUMA2?
All TLE4678ELXUMA2 units undergo pre-shipment inspection (PSI). If there is an issue with TLE4678ELXUMA2, 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 TLE4678ELXUMA2 part is unused and in its original packaging.
Return procedure for TLE4678ELXUMA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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