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Infineon Technologies TLE4678GM
- Part No.:
- TLE4678GM
- Manufacturer:
- Infineon Technologies
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLE4678GM.pdf
- Description:
- IC REG LINEAR 5V 200MA DSO14
- Quantity:
- Payment:
- Shipping:
Inventory:4,982
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Product details
Overview
TLE4678GM from Infineon Technologies is a monolithic low-dropout linear voltage regulator with integrated watchdog and reset functions, delivering a stable 5 V ±2% output at up to 200 mA. It operates across -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 TLE4678GM datasheet, TLE4678GM pinout, TLE4678GM application, or TLE4678GM equivalent, this page provides verified technical context, exact pin definitions for PG-DSO-14, functional differences versus TLE4278 and TLE4678EL, thermal design guidance, and automotive-grade supply chain support.
Technical Context
The TLE4678GM integrates a bandgap-referenced LDO regulator, independent open-collector reset (RO) and watchdog (WO) outputs, and dual adjustable thresholds: RADJ sets reset switching point via external resistor divider, while WADJ configures watchdog activation based on load current. Timing for both functions is controlled by capacitor D connected to GND.
It includes reverse polarity protection, short-circuit shutdown, overtemperature protection, and maintains reset output functionality down to VQ = 1 V. The IC supports ultra-low quiescent current in standby and exhibits excellent line transient robustness under automotive load dump conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5 V ±2% - Stable regulation for MCU core/logic supply requiring tight tolerance. |
| Max Output Current | 200 mA - Sufficient for mid-complexity automotive microcontrollers (e.g., XC22xx series). |
| Input Voltage Range | -42 V to +45 V - Withstands automotive load dump, cold crank, and reverse battery connection. |
| Dropout Voltage | Typ. 250 mV @ 200 mA - Enables operation with minimal headroom, critical in 5 V rail derivation from 12 V systems. |
| Watchdog Activation | Load-dependent threshold - Disables watchdog automatically when MCU enters standby, reducing system power. |
| Reset Output Low Limit | Active down to VQ = 1 V - Ensures reliable reset assertion even during severe brown-out conditions. |
| Operating Temperature | -40°C to +150°C junction - Validated for under-hood applications including engine control modules. |
Pinout & Package
Package: PG-DSO-14 (thermally enhanced SOIC-14 with exposed pad), RoHS-compliant, pin-compatible with TLE4278.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WO) | Watchdog output | Open-collector output pulled internally to Q; requires external pull-up if interfacing with non-5 V logic. |
| 2 (WADJ) | Watchdog activation threshold adjust | Resistor-to-GND sets current threshold; direct GND disables watchdog, 270 kΩ to Q enables permanent activation. |
| 3,4,5,10,11,12 (GND) | IC ground / thermal pad connection | Multiple GND pins must be interconnected and tied to PCB heat sink area for thermal performance. |
| 6 (D) | Reset delay & watchdog timing | Ceramic capacitor to GND sets timing for both reset delay and watchdog timeout; open disables both. |
| 7 (RADJ) | Reset switching threshold adjust | Voltage divider from Q to GND programs reset threshold; direct GND uses internal 4.65 V default. |
| 8 (WI) | Watchdog input | Positive-edge triggered; connects to MCU watchdog feed signal; tie to GND if unused. |
| 9 (Q) | Regulated 5 V output | Must be decoupled with low-ESR capacitor near IC; ESR < 1 Ω required for stability. |
| 13 (I) | Regulator input / IC supply | Accepts -42 V to +45 V; requires local ceramic capacitor to suppress transients and noise. |
| 14 (RO) | Reset output | Open-collector output pulled internally to Q; active-low reset asserted when VQ drops below threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated watchdog with load-dependent disable | Eliminates need for external watchdog IC and enables automatic power-down coordination with MCU sleep modes. |
| Programmable reset threshold & delay | Allows precise brown-out detection tuning and avoids spurious resets during transient dips using RADJ and D pins. |
| Reverse polarity protection | Withstands -42 V input without external diode, simplifying front-end protection in battery-connected circuits. |
| Reset output functional down to 1 V | Guarantees deterministic system recovery during deep undervoltage events common in automotive cranking. |
| AEC-Q100 qualified | Validated for Grade 0 (-40°C to +150°C) operation, enabling use in safety-critical engine and transmission ECUs. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering 32-bit microcontroller (e.g., Infineon XC2267) and CAN transceiver in gasoline/diesel engine management. IC Role / Device Role / Timing Role: Primary 5 V LDO with integrated reset/watchdog for MCU supervision and fault-safe shutdown. Use Value: Eliminates discrete reset IC and reduces BOM count while maintaining AEC-Q100 compliance and load-dump resilience. |
Use Scenario: Supplying door module MCU, LIN transceiver, and LED drivers in vehicle access systems. IC Role / Device Role / Timing Role: Regulated 5 V source with programmable reset delay to avoid false triggers during ignition-on transients. Use Value: RADJ and D pins enable tailored reset behavior matching BCM wake-up timing and power sequencing requirements. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance System (ADAS) Camera ECU |
|
Use Scenario: Providing stable 5 V rail to transmission MCU and solenoid driver interface ICs in automatic gearboxes. IC Role / Device Role / Timing Role: High-reliability LDO with reverse polarity and overtemperature protection for harsh under-hood environments. Use Value: -42 V to +45 V input range and 150°C junction rating ensure uninterrupted operation during gear-shifting load dumps. |
Use Scenario: Powering image sensor interface and vision processor in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Supervised 5 V regulator with watchdog input (WI) tied to processor heartbeat signal for fail-safe monitoring. Use Value: WI pin enables synchronous watchdog feeding without additional level-shifting, reducing latency and component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO-with-supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLE4278G | Same PG-DSO-14 package and pinout; lacks watchdog function and has fixed 4.85 V reset threshold. | No load-dependent watchdog disable; less flexible for MCU sleep mode integration. | Select when watchdog is unnecessary and cost optimization is prioritized over supervision flexibility. |
| TLE4678EL | PG-SSOP-14 package with exposed thermal pad; identical electrical specs but different pin assignment (e.g., WI at pin 8 vs. pin 8 in DSO-14). | Superior thermal resistance (RthJA = 50 K/W vs. 65 K/W); requires PCB layout redesign. | Select for higher-power-density designs where board space is constrained and thermal performance is critical. |
Compared with TLE4278G, TLE4678GM adds programmable watchdog and reset functions essential for modern low-power automotive MCUs; compared with TLE4678EL, it offers drop-in compatibility with legacy TLE4278 layouts while trading some thermal performance for mechanical interchangeability.
Availability
TLE4678GM is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for TLE4678GM 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 OPTIREG™ Linear product line delivers highly integrated, AEC-Q100-qualified voltage regulators with embedded supervision functions specifically for automotive microcontroller power domains.
FAQ
What is the minimum input voltage required for regulation?
The TLE4678GM regulates down to VI = -42 V, but functional regulation begins when input exceeds output voltage plus dropout (i.e., >5.25 V typical). Below that, output follows input minus dropout until dropout condition is violated. Reverse polarity operation is supported only for protection-not regulation.
Can the reset and watchdog functions operate independently?
Yes. Reset is triggered solely by output voltage (VQ) falling below the RADJ-set threshold, while watchdog activation depends on load current crossing the WADJ-defined threshold and WI edge timing. Pin D controls timing for both, but disabling one function (e.g., tying WADJ to GND) leaves the other fully operational.
Is an external capacitor required on the Q pin?
Yes. A ceramic capacitor (minimum 2.2 µF, ESR < 1 Ω) must be placed directly between Q and GND, adjacent to the IC. This ensures loop stability, suppresses high-frequency noise, and meets transient response requirements specified in Section 3.2 of the datasheet.
Does TLE4678GM support hot-swap or inrush current limiting?
No. The device lacks built-in inrush limiting or soft-start circuitry. External solutions-such as an NTC thermistor or series MOSFET with gate control-are required to manage inrush current during power-up in high-capacitance loads.
TLE4678GM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- OPTIREG™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-DSO-14
TLE4678GM FAQ
1.How can I place an order for TLE4678GM through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE4678GM 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 TLE4678GM reliable?
The price and inventory of TLE4678GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4678GM is usually 5 days.
3.What payment methods are accepted for TLE4678GM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4678GM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE4678GM?
TLE4678GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE4678GM 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 TLE4678GM?
For technical support, including TLE4678GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4678GM requirements.
6.How does Aetrix verify that TLE4678GM is sourced from the original manufacturer or authorized distributors?
All TLE4678GM 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 TLE4678GM meets industry standards.
7.What is the process for return or replacement of TLE4678GM?
All TLE4678GM units undergo pre-shipment inspection (PSI). If there is an issue with TLE4678GM, 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 TLE4678GM part is unused and in its original packaging.
Return procedure for TLE4678GM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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