TLE4678GMXUMA2 - 5V 200mA LDO w/ Reset | Infineon OPTIREG
MPN: TLE4678GMXUMA2 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.66 | $1.66 |
| 10 | $1.52 | $15.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.02 | $1,020.00 |
TLE4678GMXUMA2 Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable, low-ripple output voltage even when the input voltage approaches the output voltage, by using a pass element (typically a PNP bipolar or PMOS transistor) operating in the linear region. Within the broader power-management hierarchy, LDOs sit beneath switching converters as a final-stage clean-up regulator β supplying noise-sensitive analog, microcontroller, and sensor loads directly from a higher, often noisy, intermediate bus. The TLE4678GM specifically targets automotive body, chassis, and powertrain ECUs where a single-chip 5 V rail plus supervisory functions reduces board area and BOM cost compared with a discrete LDO plus reset/watchdog IC.
Key features include Β±2 % output voltage accuracy, integrated power-on reset with adjustable delay, window watchdog, current-limit foldback, thermal shutdown, and an enable input. The reset and watchdog thresholds are factory-trimmed for 5 V systems, simplifying firmware bring-up. The wide input range up to 45 V also tolerates 24 V industrial transients and clamped load-dump pulses typical of automotive electrical systems.
Technically, the TLE4678GM uses a vertical PNP pass transistor architecture with a bandgap reference, achieving low quiescent current (typically under 5 mA at light load) and excellent line/load transient response. The exposed-pad (PG-SSOP-14) version lowers thermal resistance for continuous high-current operation; the PG-DSO-14 GM version is pin-compatible with the older TLE4278 for easy migration.
Typical applications include automotive body control modules, instrument clusters, HVAC controllers, and industrial PLCs requiring a regulated 5 V rail with microprocessor supervision. The reset and watchdog outputs free designers from adding an external supervisor IC.
When designing with this device, place the input bulk capacitor close to VIN, use a low-ESR 1 Β΅F minimum on VOUT, and ensure PCB copper area under the exposed pad is sufficient to keep junction temperature below 150 Β°C at maximum dissipation. Watchdog timing capacitor selection must follow the datasheet's RC table to avoid spurious resets.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and practical PCB design guidance not found in the bare manufacturer datasheet.
Drop-in alternatives for TLE4678GMXUMA2 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLE4678GMXUMA2 (same form factor and footprint) β differing in Output Voltage, Package, Product Family, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLE4678ELXUMA2
β Drop-Inβ In Stock
$1.15 / Unit
View Datasheet βTLE4278
β Drop-Inπ Reference alternative (not in catalog)
TLE4678GM
β Drop-Inπ Reference alternative (not in catalog)
TLE4278G
β Drop-Inπ Reference alternative (not in catalog)
TLE4678ELXUMA2
β Drop-Inβ In Stock
$1.15 / Unit
View Datasheet βTLE4678GMXUMA2 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed (5 V) |
| Output Voltage | 5 V nominal |
| Output Voltage Tolerance | Β±2 % |
| Maximum Output Current | 200 mA |
| Input Voltage Range | Up to 45 V |
| Dropout Voltage | 350 mV typical at 200 mA (PDSO14 datasheet figure) |
| Reset Function | Integrated power-on reset with adjustable delay |
| Watchdog Function | Integrated window watchdog |
| Current Limit | Foldback current limit |
| Thermal Shutdown | Yes |
| Operating Temperature (Junction) | -40 Β°C to +150 Β°C |
| Package | PG-DSO-14 (GM variant, 14-pin SOIC) |
| Mounting Type | Surface Mount |
| Pin Compatibility | Pin-compatible with TLE4278 in PG-DSO-14 |
| Product Family | OPTIREG Linear (TLE4678 family) |
| RoHS Status | Compliant (per Infineon product page) |
TLE4678GMXUMA2 Pin Configuration
| Pin 1 | VIN β Input voltage supply (up to 45 V) |
| Pin 2 | RADJ β Reset delay adjustment (external capacitor) |
| Pin 3 | NC β Not connected (per datasheet) |
| Pin 4 | NC β Not connected (per datasheet) |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | NC β Not connected (per datasheet) |
| Pin 7 | GND β Ground |
| Pin 8 | VOUT β Regulated 5 V output |
| Pin 9 | WADJ β Watchdog timing adjustment (external capacitor) |
| Pin 10 | RO β Reset output (active low) |
| Pin 11 | NC β Not connected (per datasheet) |
| Pin 12 | EN β Enable input |
| Pin 13 | NC β Not connected (per datasheet) |
| Pin 14 | WD β Watchdog trigger input |
Typical Applications
TLE4678GMXUMA2 is suitable for 6 applications: Automotive Body Control Module (BCM), Instrument Cluster MCU Power Supply, HVAC Control Unit Power, Industrial PLC Logic Supply, Sensor Module Power (Automotive), Door Module / Window Lift ECU.
Automotive Body Control Module (BCM)
The TLE4678GMXUMA2's 5 V / 200 mA regulated output and 45 V load-dump transient rating make it ideal for body control modules that switch lighting, wipers, and door locks while powering an MCU. Its integrated reset and watchdog supervise the microcontroller without an external supervisor IC, reducing PCB area in space-constrained BCM housings. With -40 Β°C to +150 Β°C junction rating it tolerates under-hood thermal stress; the PG-DSO-14 pinout eases migration from older TLE4278 designs.
Recommended
Instrument Cluster MCU Power Supply
Instrument clusters require a stable 5 V rail for the display driver MCU and stepper motors with low EMI. The TLE4678GMXUMA2's linear regulation adds zero switching noise to the analog gauge signals, while its reset function guarantees clean MCU startup across cold-crank events dropping the bus to 6 V. The watchdog catches firmware lockups in safety-critical cluster applications, and its small PG-DSO-14 footprint fits behind the cluster LCD.
Recommended
HVAC Control Unit Power
Automotive HVAC head units combine a microcontroller, LCD, and relay drivers that all need clean 5 V from a noisy 12 V bus. The TLE4678GMXUMA2's 45 V transient rating survives compressor inrush clamp spikes, and its integrated reset ensures the MCU boots cleanly after crank events. The 350 mV dropout keeps regulation through cold starts, and the watchdog timer guards against firmware hang in climate-control algorithms.
Recommended
Industrial PLC Logic Supply
Industrial 24 V PLCs benefit from the TLE4678GMXUMA2's wide 45 V input tolerance, which absorbs switching transients on factory bus rails. The 5 V / 200 mA output powers logic ICs and small MCU subsystems without needing an additional switching regulator stage. Integrated reset provides deterministic PLC startup, and the wide -40 Β°C to +150 Β°C junction range suits unheated cabinet installations. Pin compatibility with TLE4278 eases retrofit.
Recommended
Sensor Module Power (Automotive)
Sensor modules such as parking assist, TPMS receivers, and rain/light sensors draw <50 mA and need a small, robust 5 V supply directly from the 12 V vehicle bus. The TLE4678GMXUMA2 fits in a tiny PG-DSO-14 package with integrated reset eliminating the supervisor IC. Its load-dump tolerance protects against alternator transients, and the watchdog can supervise the sensor's local MCU for diagnostic data integrity.
Recommended
Door Module / Window Lift ECU
Door modules drive window motors and mirror heaters while controlling an MCU over LIN or CAN. The TLE4678GMXUMA2's 200 mA output powers the MCU plus a small CAN transceiver from a 12 V bus exposed to motor back-EMF spikes. The 45 V input rating and reverse-battery protection guard against wiring faults during service, and the integrated watchdog resets the MCU if field firmware locks up β critical for door-latch safety functions.
Recommended
Recommended Products Summary
Engineering reference data for TLE4678GMXUMA2 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE4678ELXUMA2 | TLE4278 | TLE4678GM | TLE4278G | TLE4678EL |
|---|---|---|---|---|---|---|
| Package | PG-DSO-14 | PG-SSOP-14 (exposed pad) | PG-DSO-14 | PG-DSO-14 | PG-DSO-14 | PG-SSOP-14 (exposed pad) |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Output Voltage | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed |
| Output Current | 200 mA | 200 mA | 200 mA | 200 mA | 200 mA | 200 mA |
| Maximum Input Voltage | 45 V | 45 V | 45 V | 45 V | 45 V | 45 V |
| Integrated Watchdog | Yes (window watchdog) | Yes (window watchdog) | No | Yes (window watchdog) | No | Yes (window watchdog) |
| Integrated Reset | Yes (power-on reset, adjustable delay) | Yes | Yes | Yes | Yes | Yes |
| Thermal Package | Standard SOIC | Exposed-pad SSOP (lower ΞΈJA) | Standard SOIC | Standard SOIC | Standard SOIC | Exposed-pad SSOP (lower ΞΈJA) |
Key Differentiators
- Single-chip LDO + reset + watchdog integration (vs TLE4278)
- Pin-compatible family migration to thermally enhanced package (vs TLE4278 (legacy only))
- 45 V load-dump transient rating with reverse-polarity protection (vs Generic 5V/200mA LDOs)
Design Notes
Estimated: at VIN=12 V, VOUT=5 V, and 200 mA continuous load, the TLE4678GMXUMA2 dissipates approximately 1.4 W (Pdiss = (VIN β VOUT) Γ IOUT). Using a standard PG-DSO-14 with ΞΈJA near 100 Β°C/W on a 1 oz 2-layer board, junction temperature rises roughly 140 Β°C above 25 Β°C ambient β exceeding the 150 Β°C limit. For continuous 200 mA operation, either use the thermally enhanced PG-SSOP-14 (TLE4678ELXUMA2) variant or increase PCB copper area under the exposed pad. Always consult Figure 4 (derating curve) in the Infineon datasheet for the specific board profile.
Place the input bulk capacitor (β₯ 1 Β΅F low-ESR ceramic or 10 Β΅F tantalum) within 5 mm of the VIN pin to suppress automotive load-dump transients. The output capacitor requires a minimum 1 Β΅F low-ESR ceramic with < 100 mΞ© ESR for regulator stability; use X7R dielectric for temperature stability. Keep reset (RO) and watchdog (WD) traces away from switching nodes to avoid false triggering; the RADJ and WADJ capacitor grounds must return directly to the IC GND pin.
Do not exceed 45 V on VIN even transiently β the device has internal clamp but sustained overvoltage will trigger thermal shutdown. The reset delay capacitor (RADJ) must be sized per the timing equation in the datasheet; values below 1 nF produce unstable reset pulses, while values above 470 nF delay MCU boot excessively. Watchdog timing must be configured longer than the worst-case MCU firmware loop time, otherwise spurious resets occur. Avoid leaving EN floating β tie to VIN through a 100 kΞ© resistor if unused.
Compliance Information
AEC-Q100 qualified for automotive applications per Infineon OPTIREG Linear datasheet. RoHS and REACH compliant. Halogen-free per Infineon product page.
