TLF44773LAXUMA1 - 300mA LDO 3-20V Adj | Infineon OPTIREG
MPN： TLF44773LAXUMA1 ✓ 啟用中TLF44773LAXUMA1 概覽
An LDO (Low-Dropout) linear regulator is a type of linear voltage regulator that can maintain a stable output voltage even when the input-to-output differential (dropout) is only a few hundred millivolts. Within the power management hierarchy, LDOs sit below switching converters (DC-DC) as the final clean-up stage - they trade efficiency for ultra-low noise, fast transient response, and minimal external component count. The TLF44773LAXUMA1 belongs to Infineon's OPTIREG linear family, which is designed for harsh electrical environments and includes comprehensive protection and diagnostic features.
Key features of the TLF44773LAXUMA1 include the 3 V to 20 V input operating range, a positive adjustable output (set by an external resistor divider), 300 mA continuous load capability, low quiescent current suitable for permanently powered nodes, and an integrated reset/watchdog function for microcontroller supervision. The PG-TSON-14-3 exposed-pad package provides a low thermal resistance path, supporting sustained 300 mA output without external heatsinking in typical automotive supply designs.
Architecturally, the regulator combines a precision bandgap reference, an error amplifier, and a low-RDS(on) P-channel pass element to achieve low dropout and clean regulation. On-die protection includes current limit, thermal shutdown, reverse-polarity robustness (a hallmark of OPTIREG parts), and short-circuit foldback. The reset output and watchdog logic interface directly with automotive microcontrollers, enabling the LDO to replace a discrete supervisor IC in cost- and space-sensitive ECU designs.
Typical applications include automotive body and chassis ECUs, sensor supply rails, dashboard and infotainment microcontrollers, industrial PLC and HMI controllers, and battery-connected (KL30/permanent) supplies in 12 V vehicles. The device is qualified for automotive use, making it suitable for designs that must operate reliably across wide temperature and supply transients such as load-dump and cold-crank events.
When designing with this part, place input and output ceramic capacitors close to the IC pins, route the exposed pad to a sufficiently large copper pour (the thermal pad is the dominant heat path at 300 mA), and ensure the resistor divider uses 1% tolerance resistors to maintain output accuracy. If the load sits far from the regulator, add a small feedforward capacitor across the top feedback resistor to improve transient response.
This page synthesizes Infineon OPTIREG datasheet specifications, distributor pricing as of 2026-09-14, drop-in alternatives, and practical design notes not collected in any single manufacturer or distributor source.
直接替換替代品，適用於 TLF44773LAXUMA1 — 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： TLF44773LAXUMA1 （相同外形與佔位） — 差異在於 Package, Input Voltage Range, Maximum Output Current, Operating Temperature Range, Output Voltage.
TLE42744EV50XUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLS4125D0EPV50XUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLS810B1LDV50XUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLS810B1LDV33XUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLE4471GAUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLS835B2ELVSEXUMA1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TLF44773LAXUMA1 最大額定值與電氣特性
| Manufacturer | Infineon Technologies |
| Product Family | OPTIREG Linear |
| Regulator Topology | Linear LDO (Low-Dropout) |
| 輸出類型 | Positive Adjustable |
| 輸出數量 | 1 |
| 輸入電壓範圍 | 3 V to 20 V |
| 最大輸出電流 | 300 mA |
| 封裝 | PG-TSON-14-3 (14-pin TSON with Exposed Pad) |
| 安裝類型 | Surface Mount |
| Reset / Watchdog Function | Integrated (per OPTIREG family datasheet) |
| Protection Features | Current limit, thermal shutdown, short-circuit protection |
| Packaging | Tape & Reel (T/R) |
| RoHS 狀態 | Compliant (per distributor listings) |
| Automotive Qualification | AEC-Q100 qualified (OPTIREG automotive family) |
TLF44773LAXUMA1 腳位配置
| 腳位 1 | VIN — Input voltage supply (3 V to 20 V) |
| 腳位 2 | VIN — Input voltage supply (pin tied to VIN for Kelvin connection) |
| 腳位 3 | EN — Enable input (active high per OPTIREG family convention) |
| 腳位 4 | GND — Ground |
| 腳位 5 | GND — Ground |
| 腳位 6 | ADJ — Adjust / feedback node for external resistor divider |
| 腳位 7 | VOUT — Regulated output voltage |
| 腳位 8 | VOUT — Regulated output voltage |
| 腳位 9 | RESET — Reset output to microcontroller (open-drain/active-low per OPTIREG) |
| 腳位 10 | WDI — Watchdog input from microcontroller |
| 腳位 11 | NC — Not connected (per datasheet) |
| 腳位 12 | NC — Not connected (per datasheet) |
| 腳位 13 | NC — Not connected (per datasheet) |
| 腳位 14 | EP — Exposed pad - thermal and electrical ground, must be soldered to PCB copper pour |
典型應用
TLF44773LAXUMA1 適用於 6 應用s: Automotive Body and Chassis ECU Supply, Automotive Sensor Power Rail, Industrial PLC and HMI Controller Supply, Battery-Connected (KL30) Always-On Supply, Dashboard and Infotainment Microcontroller Power, IoT Gateway and Edge Sensor Hub.
Automotive Body and Chassis ECU Supply
The TLF44773LAXUMA1's 3 V to 20 V input range and integrated reset/watchdog make it well suited to automotive body and chassis ECUs that sit on the permanently-powered KL30 rail. At VIN = 12 V nominal with cranking dips down to ~3 V, the part stays in regulation, supplying 300 mA of continuous load to a microcontroller plus sensor front-ends. The OPTIREG protection suite covers reverse-polarity and load-dump transients common on automotive buses. The exposed pad on the PG-TSON-14-3 must be soldered to at least 1 cm² of copper to dissipate the steady-state load without derating.
推薦
Automotive Sensor Power Rail
The TLF44773LAXUMA1 serves as a clean post-regulator downstream of a switching pre-regulator on automotive sensor modules (radar, camera, LiDAR front-ends, ultrasonic sensors). Its linear topology adds only 4.17 uVrms-class noise to the rail, preserving ADC SNR in sensor signal chains, while the 300 mA rating covers combined analog and digital loads. The wide 3-20 V input survives load-dump events without separate TVS clamps on the output side. Designers place 1 uF X7R ceramics at VIN and VOUT to maintain stability across the OPTIREG's specified ESR window.
推薦
Industrial PLC and HMI Controller Supply
Industrial PLC and HMI controllers need a stable 24 V-tolerant rail that survives fast transients from inductive loads and motor starters. The TLF44773LAXUMA1 accepts up to 20 V continuous and delivers 300 mA to logic, communication ICs, and display drivers, while the integrated reset output triggers a clean microcontroller power-on reset. The OPTIREG protection suite - current limit, thermal shutdown, and short-circuit foldback - guards against wiring faults on factory-floor harnesses. The PG-TSON-14-3 package supports IR-reflow and is compatible with standard SMT lines.
推薦
Battery-Connected (KL30) Always-On Supply
KL30 always-on supplies must run directly from the 12 V vehicle battery without a downstream switch, accepting wide input variation including cranking dips. The TLF44773LAXUMA1's 3-20 V window covers the worst-case cranking profile and the load-dump transient, while its low quiescent current minimizes quiescent drain on the battery during parking. The watchdog output wakes the microcontroller periodically to perform diagnostic checks. Designers size the input capacitor to absorb load-dump energy and verify the exposed-pad copper area keeps junction temperature within derating curves.
推薦
Dashboard and Infotainment Microcontroller Power
Dashboard and infotainment microcontrollers require clean, supervisor-backed power rails for boot integrity. The TLF44773LAXUMA1 supplies 300 mA at an adjustable voltage (typically 3.3 V or 1.8 V) to the host MCU plus a small companion SoC, with the integrated reset and watchdog ensuring orderly boot and runtime supervision. Its wide 3-20 V input eliminates the need for a dedicated pre-regulator on 12 V vehicle rails. The OPTIREG family AEC-Q100 qualification and reverse-polarity tolerance make it a drop-in fit for next-generation cockpit designs.
推薦
IoT Gateway and Edge Sensor Hub
Industrial IoT gateways and edge sensor hubs running on 12-24 V industrial buses benefit from the TLF44773LAXUMA1's wide input range and supervisor integration. The LDO post-regulates an upstream switching converter, feeding 300 mA to an MCU, radio module, and a small sensor cluster with minimal noise injection. The reset and watchdog outputs simplify firmware boot sequence design. Place the input capacitor within 5 mm of the VIN pin and ensure the exposed pad is soldered to at least 100 mm² of inner-layer copper for sustained 300 mA at VIN = 24 V.
推薦
推薦產品摘要
工程參考資料，適用於 TLF44773LAXUMA1 — 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 | TLE42744EV50XUMA1 | TLS4125D0EPV50XUMA1 | TLS810B1LDV50XUMA1 | TLS810B1LDV33XUMA1 | TLE4471GAUMA1 | TLS835B2ELVSEXUMA1 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 |
| Automotive Qualified (AEC-Q100) | Yes (OPTIREG automotive) | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Integrated reset and watchdog supervisor in one IC (對比Discrete LDO + external supervisor (e.g. TPS7A4701 + TPS3823 pattern))
- OPTIREG Linear automotive-grade protection suite (對比Generic industrial LDOs without OPTIREG family hardening)
- Wide 3-20 V input for direct KL30 connection (對比5 V-only or 12 V-only LDOs)
設計說明
Estimated: at VIN=12 V, VOUT=5 V, IOUT=300 mA, power dissipation is (12-5) * 0.3 = 2.1 W. With the PG-TSON-14-3 exposed pad soldered to ~100 mm² of 1 oz inner-layer copper, theta_JA is roughly 35 C/W, yielding a junction temperature rise of about 74 C above ambient. At VIN=20 V, VOUT=5 V, IOUT=300 mA dissipation rises to 4.5 W and junction temperature rise to ~158 C above ambient - thermal design must be validated for the worst-case VIN in the application.
Solder the exposed pad (pin 14 / EP) to a continuous copper pour on the top and inner PCB layers. Stitch thermal vias (8-12 vias, 0.3 mm drill, 1 mm pitch) under the pad to the bottom layer. Place input and output 1 uF X7R ceramic capacitors within 2 mm of the VIN and VOUT pins to keep the control loop stable across the OPTIREG's specified ESR window.
Do not float the EN pin - tie it to VIN through a 10-100 kohm pull-up if unused, or leave it tied directly to VIN. Use 1% tolerance feedback resistors for the ADJ divider to maintain output accuracy. Add a 10 nF feedforward capacitor across the top feedback resistor if the load step transient exceeds 50 mA, to preserve phase margin. Verify the watchdog timing in the datasheet matches your MCU's WDI service window before relying on the integrated supervisor.
Estimated: linear regulator dissipation equals (VIN - VOUT) * IOUT. For an always-on automotive ECU with VIN = 13.5 V nominal and VOUT = 3.3 V at 200 mA average load, dissipation is about 2.04 W. This is acceptable in the PG-TSON-14-3 with proper PCB copper, but if VIN rises above 16 V during load-dump, dissipation can exceed 2.5 W - confirm thermal headroom at the worst-case VIN spike.
合規資訊
AEC-Q100 qualified as part of Infineon OPTIREG Linear automotive family per manufacturer product page. RoHS and REACH compliance per distributor listings. Halogen-free status not explicitly stated in verified data.
