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Infineon Technologies TLE4278GNT
- Part No.:
- TLE4278GNT
- Manufacturer:
- Infineon Technologies
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLE4278GNT.pdf
- Description:
- IC REG LINEAR 5V 150MA DSO14-30
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
TLE4278GNT from Infineon Technologies is a monolithic 5 V low-drop fixed linear voltage regulator delivering up to 200 mA, featuring integrated watchdog and reset functions with adjustable thresholds, ±2% output voltage tolerance, and AEC-Q100 qualification for automotive microprocessor supply under harsh conditions.
For engineers reviewing the TLE4278GNT datasheet, TLE4278GNT pinout, TLE4278GNT application, or TLE4278GNT equivalent, key selection considerations include its dual open-collector outputs (RO/WO), programmable reset delay via external capacitor, adjustable reset threshold via RADJ voltage divider, and watchdog disable capability based on load current - all critical for robust ECU power management design.
Technical Context
The TLE4278GNT implements a bandgap-referenced control amplifier with thermal shutdown, reverse polarity protection, and short-circuit proofing. Its functional range supports input voltages from 5.5 V to 45 V and junction temperatures from −40 °C to +150 °C, meeting automotive-grade reliability requirements.
It integrates two independent supervision circuits: a reset generator with user-adjustable threshold (via RADJ) and delay (via capacitor on D), and a rising-edge-triggered watchdog (WI) with externally programmable timeout (via WADJ resistor) and separate open-collector output (WO), enabling flexible microcontroller monitoring without coupling reset behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±2% (4.90–5.10 V at 0–150 mA); ensures stable MCU core/logic supply within automotive voltage tolerances. |
| Max Output Current | 200 mA continuous; sufficient for small microcontrollers, CAN transceivers, and sensor interfaces in body control modules. |
| Drop Voltage | 0.25 V typical at 150 mA; enables operation down to VI = 5.5 V, supporting cold-crank scenarios in 12 V systems. |
| Quiescent Current | 180 µA typical at 25 °C, 210 µA at 85 °C; minimizes standby power loss in always-on vehicle domains. |
| Reset Threshold | 4.65 V typical (adjustable 4.5–4.8 V via RADJ); guarantees clean MCU reset before brownout-induced corruption. |
| Watchdog Timeout | Programmable via external resistor on WADJ; allows tailoring of fault detection window to specific firmware execution cycles. |
| Thermal Resistance | Rthj-a = 80 K/W (PCB-mounted); defines heatsinking requirement for sustained 200 mA operation at Tj ≤ 150 °C. |
Pinout & Package
The TLE4278GNT is housed in a PG-DSO-14 (14-pin exposed pad SOIC) package, optimized for thermal dissipation in automotive PCB layouts with internal GND plane connection via exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WO) | Watchdog Output | Open-collector output pulled internally to Q (5 V) via 30 kΩ; asserts low on watchdog timeout - usable as MCU interrupt or wake-up signal. |
| 2 (WADJ) | Watchdog Threshold Adjust | Resistor-to-GND sets watchdog activation threshold; enables load-current-dependent watchdog disable or timer-mode wake-up. |
| 3,4,5,10,11,12 (GND) | Ground | Multiple low-inductance GND connections reduce noise coupling and improve thermal conduction to PCB ground plane. |
| 6 (D) | Reset Delay | Capacitor-to-GND sets reset assertion delay (12–28 ms with 47 nF); prevents premature MCU startup during input ramp-up. |
| 7 (RADJ) | Reset Threshold Adjust | Voltage divider from Q to GND sets reset trigger point (down to 4.5 V); supports MCUs with extended low-voltage operation. |
| 8 (WI) | Watchdog Input | Rising-edge-triggered input; monitors MCU heartbeat pulses - missing edge within programmed window triggers WO low. |
| 9 (Q) | 5 V Output | Main regulated output; requires ≥10 µF ceramic capacitor (ESR ≤ 5 Ω) directly at pin for stability and transient response. |
| 13 (I) | Input Voltage | Accepts 5.5–45 V; requires local ceramic decoupling capacitor directly at pin to suppress high-frequency noise and transients. |
| 14 (RO) | Reset Output | Open-collector reset output pulled internally to Q (5 V) via 30 kΩ; asserts low on power-on or under-voltage condition. |
Key Features
| Feature | Design Value |
|---|---|
| Separated RO and WO outputs | Enables independent handling of system reset and watchdog events - avoids spurious resets during MCU sleep modes. |
| Adjustable reset switching threshold | Configurable via external voltage divider on RADJ, allowing compatibility with MCUs requiring reset below 4.65 V nominal. |
| Load-dependent watchdog disable | Automatic deactivation when load current drops below threshold (set by WADJ resistor), eliminating false timeouts during low-power states. |
| Integrated overtemperature & short-circuit protection | Thermal shutdown activates at Tj > 150 °C; current limiting engages during overload - no external components needed for basic fault safety. |
| AEC-Q100 qualified | Validated for Grade 1 (−40 °C to +125 °C ambient) and Grade 0 (−40 °C to +150 °C junction), ensuring reliability in engine bay and transmission control units. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Power Sequencing |
|---|---|
Use Scenario: Regulating 5 V supply for LIN transceivers, door lock actuators, and interior lighting controllers in modern BCMs. IC Role / Device Role / Timing Role: Primary 5 V LDO with integrated reset supervision and watchdog monitoring of BCM microcontroller. Use Value: Eliminates need for discrete reset IC and external watchdog timer; reduces BOM count while maintaining AEC-Q100 compliance. | Use Scenario: Providing sequenced 5 V power and reliable reset signaling during engine start/stop cycles with wide input voltage variation (5.5–45 V). IC Role / Device Role / Timing Role: System power supervisor and voltage regulator with programmable reset delay and cold-crank tolerant drop voltage. Use Value: Ensures deterministic MCU initialization after battery voltage recovery, preventing erratic behavior during cranking transients. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Sensor Hub |
Use Scenario: Supplying 5 V to solenoid drivers and position sensors in automatic transmission control systems operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: High-temperature-stable LDO with overtemperature protection and watchdog-enabled firmware health monitoring. Use Value: Maintains regulation up to 150 °C junction temperature and provides fail-safe watchdog feedback to prevent stuck solenoid conditions. | Use Scenario: Powering radar preprocessing MCU and CAN interface in compact ADAS domain controllers where board space and thermal margin are constrained. IC Role / Device Role / Timing Role: Compact, thermally efficient 5 V regulator with dual supervision outputs for concurrent reset and interrupt signaling. Use Value: Reduces footprint vs. discrete regulator + reset IC + watchdog solution; exposed pad enhances thermal performance in sealed enclosures. |
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 |
|---|---|---|---|
| TLV70733PDRVR | 3.3 V fixed output, 200 mA, no integrated watchdog or reset; only basic LDO functionality. | Lacks supervision features - requires external reset IC and watchdog circuit for equivalent functionality. | Select only if system already implements discrete supervision and 3.3 V (not 5 V) rail is required. |
| MAX6715AATA+T | 5 V supervisory IC (reset only), no regulation; requires external 5 V source and cannot supply load current. | Provides precise reset timing but zero power delivery - must be paired with separate LDO or DC/DC converter. | Choose when existing power stage needs only enhanced reset accuracy, not integrated regulation. |
Compared with TLV70733PDRVR and MAX6715AATA+T, the TLE4278GNT uniquely combines 5 V regulation, 200 mA drive, and dual programmable supervision (reset + watchdog) in one AEC-Q100-qualified package - eliminating three discrete components and simplifying layout, thermal design, and qualification effort.
Availability
TLE4278GNT is available at Aetrix Electronics and suitable for body control modules, engine control units, transmission control units, and ADAS sensor hubs requiring stable component supply across automotive production lifecycles.
Supply support for TLE4278GNT 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 industrial control ICs, with leadership in AEC-Q100-qualified analog and mixed-signal solutions.
The TLE4278GNT belongs to Infineon's OPTIREG™ Linear family, engineered specifically for automotive power supply and system supervision tasks - emphasizing robustness, integration density, and seamless compatibility with microcontroller-based ECUs.
FAQ
What is the minimum input voltage required for regulation?
The TLE4278GNT maintains regulation down to 5.5 V input, with a typical drop voltage of 0.25 V at 150 mA. This enables reliable operation during automotive cold-crank events where battery voltage may dip to 6 V, ensuring uninterrupted 5 V supply to connected microcontrollers and peripherals.
How is the reset delay time set, and what capacitor value achieves ~20 ms?
The reset delay is set by an external capacitor connected between pin D and GND. With a 47 nF capacitor, the delay is 12–28 ms (typical 20 ms) across temperature and process variation. The capacitor must be ceramic with low ESR to ensure accurate timing and avoid instability in the internal RC network.
Can the watchdog and reset outputs be used together without conflict?
Yes - RO and WO are electrically isolated open-collector outputs with separate internal pull-ups to Q. They can be tied together externally if combined signaling is desired, or kept separate to allow independent MCU handling of reset events (e.g., RO for hard reset, WO for software interrupt). No internal contention occurs.
Is the exposed pad on the PG-DSO-14 package required to be soldered to GND?
Yes - the exposed thermal pad must be soldered to a PCB GND plane with adequate copper area (≥6 cm² recommended). It serves as both thermal conduction path and electrical GND connection; omitting this compromises thermal performance and may cause premature thermal shutdown under sustained 200 mA load.
TLE4278GNT 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):
- 0.5V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- 12 mA
- PSRR:
- -
- 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-14-30
TLE4278GNT FAQ
1.How can I place an order for TLE4278GNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE4278GNT 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 TLE4278GNT reliable?
The price and inventory of TLE4278GNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4278GNT is usually 5 days.
3.What payment methods are accepted for TLE4278GNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4278GNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE4278GNT?
TLE4278GNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE4278GNT 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 TLE4278GNT?
For technical support, including TLE4278GNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4278GNT requirements.
6.How does Aetrix verify that TLE4278GNT is sourced from the original manufacturer or authorized distributors?
All TLE4278GNT 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 TLE4278GNT meets industry standards.
7.What is the process for return or replacement of TLE4278GNT?
All TLE4278GNT units undergo pre-shipment inspection (PSI). If there is an issue with TLE4278GNT, 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 TLE4278GNT part is unused and in its original packaging.
Return procedure for TLE4278GNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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