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Infineon Technologies TLE4278GXUMA3
- Part No.:
- TLE4278GXUMA3
- Manufacturer:
- Infineon Technologies
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLE4278GXUMA3.pdf
- Description:
- IC REG LINEAR 5V 200MA DSO14-30
- Quantity:
- Payment:
- Shipping:
Inventory:19,329
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Product details
Overview
TLE4278GXUMA3 from Infineon Technologies is a monolithic 5 V low-drop fixed-output linear voltage regulator delivering up to 200 mA, featuring integrated watchdog and reset functions with adjustable thresholds, ±2% output voltage tolerance, and operation across −40 °C to +150 °C for automotive microprocessor supply under harsh conditions.
For engineers reviewing the TLE4278GXUMA3 datasheet, TLE4278GXUMA3 pinout, TLE4278GXUMA3 application, or TLE4278GXUMA3 equivalent, key selection criteria include its dual open-collector outputs (WO/RO), external capacitor-adjustable reset delay (12–28 ms), load-dependent watchdog disable capability, and AEC-Q100 qualification for engine control and body electronics.
Technical Context
The TLE4278GXUMA3 integrates a bandgap-referenced control amplifier, thermal shutdown, reverse polarity protection, and short-circuit proofing within a single PG-DSO-14 package. Its functional architecture separates watchdog monitoring (WI/WO) from reset generation (RADJ/RO/D), enabling independent timing and threshold control.
It operates over 5.5–45 V input range with ≤0.5 V dropout at 150 mA, supports reset activation down to VQ = 1 V, and provides programmable watchdog timeout via WADJ resistor and reset delay via capacitor on pin D - all while maintaining <230 µA quiescent current at 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±2% (4.90–5.10 V @ 0–150 mA); ensures stable MCU core supply under line/load variation |
| Max Output Current | 200 mA continuous; sufficient for automotive MCUs, CAN transceivers, and sensor interfaces |
| Dropout Voltage | 0.25–0.5 V @ 150 mA; enables operation with low VIN margin in 12 V battery systems |
| Quiescent Current | 230 µA max @ 85 °C; critical for always-on vehicle modules with strict sleep-mode leakage limits |
| Reset Delay Range | 12–28 ms (with 47 nF capacitor); configurable power-on reset timing for deterministic MCU boot |
| Watchdog Input Threshold | Rising-edge triggered; supports pulse widths ≥1 µs for reliable microcontroller activity monitoring |
| Operating Temp Range | −40 °C to +150 °C junction; qualified per AEC-Q100 Grade 0 for under-hood applications |
Pinout & Package
Package: PG-DSO-14 (exposed thermal pad, RoHS-compliant, surface-mount).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WO) | Watchdog Output | Open-collector output pulled internally to VQ via 30 kΩ; signals watchdog timeout to MCU interrupt or status line |
| 2 (WADJ) | Watchdog Threshold Adjust | Resistor-to-GND sets load-current-dependent watchdog disable threshold; prevents spurious wake-up in sleep mode |
| 3,4,5,10,11,12 (GND) | Ground | Multiple low-inductance GND connections minimize noise coupling and improve thermal dissipation |
| 6 (D) | Reset Delay | Capacitor-to-GND sets reset assertion delay (12–28 ms); defines minimum power-rail stabilization time before MCU release |
| 7 (RADJ) | Reset Threshold Adjust | Voltage divider input to set custom reset activation point (e.g., 3.3 V MCU compatibility); overrides internal 4.65 V threshold |
| 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) for stability and transient response |
| 13 (I) | Input Voltage | Accepts 5.5–45 V; requires local ceramic decoupling directly at pin for EMI suppression and transient immunity |
| 14 (RO) | Reset Output | Open-collector reset signal pulled internally to VQ via 30 kΩ; asserts low during POR, UVLO, or delayed reset |
Key Features
| Feature | Design Value |
|---|---|
| Separated WO and RO outputs | Enables independent watchdog fault signaling and system reset control - avoids false resets during watchdog timeouts |
| Adjustable reset switching threshold | External voltage divider on RADJ allows reset activation at 3.0–4.8 V, supporting diverse MCU VDD requirements |
| Load-dependent watchdog disable | WADJ resistor configures automatic watchdog suspension when load current drops below threshold - eliminates wake-ups in MCU sleep |
| Reset operation down to VQ = 1 V | Ensures fail-safe reset assertion even during severe brown-out or battery sag conditions |
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full reliability testing - suitable for engine control, transmission, and ADAS modules |
Applications
| Engine Control Unit (ECU) Power Supply | Body Control Module (BCM) Regulation |
|---|---|
|
Use Scenario: Powers 32-bit MCU, CAN controller, and analog sensors in gasoline/diesel engine management systems exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Primary 5 V regulator with integrated POR, UVLO, and watchdog supervision - replaces discrete reset IC + LDO combo. Use Value: Reduces BOM count by consolidating regulation, reset, and watchdog into one AEC-Q100-qualified device; dropout <0.5 V maintains regulation during cranking (VIN ≈ 6 V). |
Use Scenario: Supplies door module microcontrollers and LIN transceivers in ambient cabin environments with intermittent battery disconnect events. IC Role / Device Role / Timing Role: Stable 5 V source with programmable reset delay and adjustable threshold - accommodates varying MCU startup timing and brown-out sensitivity. Use Value: RADJ pin enables reset at 3.6 V for 3.3 V MCUs; GND-connected RADJ defaults to 4.65 V for legacy 5 V logic - single SKU supports multiple designs. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Regulates image sensor and ISP in front-facing ADAS cameras mounted near windshield, subject to thermal cycling and ESD stress. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO with reverse polarity and short-circuit protection - safeguards downstream imaging circuitry. Use Value: 230 µA max Iq at 85 °C minimizes self-heating in sealed enclosures; ±2% VOUT tolerance ensures consistent ADC reference accuracy. |
Use Scenario: Powers torque and position sensor signal conditioners in EPS motor control units where EMI immunity and fault resilience are critical. IC Role / Device Role / Timing Role: Dual-function supervisor: WI monitors MCU health, WO triggers interrupt on fault; RO drives safety-critical reset line. Use Value: Separated WO/RO outputs allow diagnostic logging (via WO) without disrupting safety reset path (RO); meets ISO 26262 ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO with watchdog/reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDBVR | 3.3 V fixed output, no watchdog/reset features, SOT-23-5 package, 200 mA, 250 mV dropout | Basic regulation only; lacks integrated supervision - requires external reset IC and timer | Select when cost-sensitive, space-constrained designs need only clean 3.3 V supply without diagnostics |
| MAX6326US31D3+ | 3.08 V reset-only supervisor (no regulation), SOT-23-3, 1.25 % reset threshold accuracy, 200 ms min delay | Provides only reset functionality; must pair with separate LDO for power delivery | Choose when existing LDO design needs added reset supervision with tighter threshold tolerance than TLE4278G offers |
Compared with TLV70733PDBVR and MAX6326US31D3+, the TLE4278GXUMA3 uniquely integrates regulation, adjustable reset, and load-aware watchdog in one AEC-Q100-qualified PG-DSO-14 package - reducing board area, component count, and validation effort for new automotive ECUs.
Availability
TLE4278GXUMA3 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering requiring stable component supply with automotive-grade reliability and traceable sourcing.
Supply support for TLE4278GXUMA3 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 R&D infrastructure.
The OPTIREG™ Linear product line delivers AEC-Q100-qualified voltage regulators and supervisors engineered specifically for automotive subsystems demanding high reliability, thermal robustness, and integrated functional safety features.
FAQ
What is the purpose of the WADJ pin, and how is it configured?
The WADJ pin sets the load-current threshold at which the watchdog function automatically disables - preventing false timeouts during MCU sleep modes. It is configured with a single resistor from WADJ to GND; typical values range from 10 kΩ (disable ~5 mA load) to 100 kΩ (disable ~50 mA load), per Figure 16 in the datasheet.
Can the reset threshold be adjusted below 4.5 V, and what is the minimum supported value?
Yes, the reset threshold is adjustable via an external voltage divider on the RADJ pin. The datasheet confirms operation down to VRADJ = 1.28 V (min), corresponding to a reset activation point as low as ~3.0 V depending on divider ratio - enabling compatibility with 3.3 V MCUs that require reset assertion below the internal 4.65 V default.
Is the TLE4278GXUMA3 compatible with 42 V stop-start battery systems?
No - the absolute maximum input voltage is 45 V, but the functional input range is specified as 5.5–42 V only for transient conditions (e.g., load dump). Continuous operation above 28 V degrades line regulation (±20 mV) and increases thermal stress; sustained 42 V operation requires careful thermal design and derating per Rthj-a = 80 K/W.
How does the watchdog function behave when the WI pin receives no pulses?
When no rising edge is detected on WI within the programmed watchdog timeout period (set by WADJ resistor), the WO pin pulls low. This state persists until the next valid rising edge arrives - providing a latched fault signal usable as an MCU interrupt or diagnostic flag, independent of the reset output RO.
TLE4278GXUMA3 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:
- 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):
- 0.5V @ 150mA
- Current - Output:
- 200mA
- 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
TLE4278GXUMA3 FAQ
1.How can I place an order for TLE4278GXUMA3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE4278GXUMA3 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 TLE4278GXUMA3 reliable?
The price and inventory of TLE4278GXUMA3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4278GXUMA3 is usually 5 days.
3.What payment methods are accepted for TLE4278GXUMA3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4278GXUMA3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE4278GXUMA3?
TLE4278GXUMA3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE4278GXUMA3 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 TLE4278GXUMA3?
For technical support, including TLE4278GXUMA3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4278GXUMA3 requirements.
6.How does Aetrix verify that TLE4278GXUMA3 is sourced from the original manufacturer or authorized distributors?
All TLE4278GXUMA3 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 TLE4278GXUMA3 meets industry standards.
7.What is the process for return or replacement of TLE4278GXUMA3?
All TLE4278GXUMA3 units undergo pre-shipment inspection (PSI). If there is an issue with TLE4278GXUMA3, 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 TLE4278GXUMA3 part is unused and in its original packaging.
Return procedure for TLE4278GXUMA3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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