TLE4678GMXUMA2 - 5V 200mA LDO w/ Reset | Infineon OPTIREG
MPN： TLE4678GMXUMA2 ✓ 啟用中TLE4678GMXUMA2 概覽
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 — 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 ±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 µF minimum on VOUT, and ensure PCB copper area under the exposed pad is sufficient to keep junction temperature below 150 °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.
直接替換替代品，適用於 TLE4678GMXUMA2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TLE4678GMXUMA2 （相同外形與佔位） — 差異在於 Output Voltage, Package, Product Family, RoHS Status.
TLE4678ELXUMA2
✅ 直接替換聯絡詢價
查看資料表 →TLE4278
✅ 直接替換📋 參考替代品（不在目錄中）
TLE4678GM
✅ 直接替換📋 參考替代品（不在目錄中）
TLE4278G
✅ 直接替換📋 參考替代品（不在目錄中）
TLE4678ELXUMA2
✅ 直接替換聯絡詢價
查看資料表 →TLE4678GMXUMA2 最大額定值與電氣特性
| 輸出類型 | Fixed (5 V) |
| 輸出電壓 | 5 V nominal |
| Output Voltage Tolerance | ±2 % |
| 最大輸出電流 | 200 mA |
| 輸入電壓範圍 | Up to 45 V |
| 壓降電壓 | 350 mV typical at 200 mA (PDSO14 datasheet figure) |
| Reset Function | Integrated power-on reset with adjustable delay |
| Watchdog Function | Integrated window watchdog |
| 電流限制 | Foldback current limit |
| 過熱關機 | Yes |
| Operating Temperature (Junction) | -40 °C to +150 °C |
| 封裝 | PG-DSO-14 (GM variant, 14-pin SOIC) |
| 安裝類型 | Surface Mount |
| Pin Compatibility | Pin-compatible with TLE4278 in PG-DSO-14 |
| Product Family | OPTIREG Linear (TLE4678 family) |
| RoHS 狀態 | Compliant (per Infineon product page) |
TLE4678GMXUMA2 腳位配置
| 腳位 1 | VIN — Input voltage supply (up to 45 V) |
| 腳位 2 | RADJ — Reset delay adjustment (external capacitor) |
| 腳位 3 | NC — Not connected (per datasheet) |
| 腳位 4 | NC — Not connected (per datasheet) |
| 腳位 5 | NC — Not connected (per datasheet) |
| 腳位 6 | NC — Not connected (per datasheet) |
| 腳位 7 | GND — Ground |
| 腳位 8 | VOUT — Regulated 5 V output |
| 腳位 9 | WADJ — Watchdog timing adjustment (external capacitor) |
| 腳位 10 | RO — Reset output (active low) |
| 腳位 11 | NC — Not connected (per datasheet) |
| 腳位 12 | EN — Enable input |
| 腳位 13 | NC — Not connected (per datasheet) |
| 腳位 14 | WD — Watchdog trigger input |
典型應用
TLE4678GMXUMA2 適用於 6 應用s: 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 °C to +150 °C junction rating it tolerates under-hood thermal stress; the PG-DSO-14 pinout eases migration from older TLE4278 designs.
推薦
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.
推薦
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.
推薦
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 °C to +150 °C junction range suits unheated cabinet installations. Pin compatibility with TLE4278 eases retrofit.
推薦
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.
推薦
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 — critical for door-latch safety functions.
推薦
推薦產品摘要
工程參考資料，適用於 TLE4678GMXUMA2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 θJA) | Standard SOIC | Standard SOIC | Standard SOIC | Exposed-pad SSOP (lower θJA) |
主要差異化特點
- Single-chip LDO + reset + watchdog integration (對比TLE4278)
- Pin-compatible family migration to thermally enhanced package (對比TLE4278 (legacy only))
- 45 V load-dump transient rating with reverse-polarity protection (對比Generic 5V/200mA LDOs)
設計說明
Estimated: at VIN=12 V, VOUT=5 V, and 200 mA continuous load, the TLE4678GMXUMA2 dissipates approximately 1.4 W (Pdiss = (VIN − VOUT) × IOUT). Using a standard PG-DSO-14 with θJA near 100 °C/W on a 1 oz 2-layer board, junction temperature rises roughly 140 °C above 25 °C ambient — exceeding the 150 °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 (≥ 1 µF low-ESR ceramic or 10 µF tantalum) within 5 mm of the VIN pin to suppress automotive load-dump transients. The output capacitor requires a minimum 1 µF low-ESR ceramic with < 100 mΩ 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 — 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 — tie to VIN through a 100 kΩ resistor if unused.
合規資訊
AEC-Q100 qualified for automotive applications per Infineon OPTIREG Linear datasheet. RoHS and REACH compliant. Halogen-free per Infineon product page.
