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Infineon Technologies TLF44773LAXUMA1
- Part No.:
- TLF44773LAXUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- -
- Datasheet:
-
TLF44773LAXUMA1.pdf
- Description:
- OPTIREG LINEAR PG-TSON-14
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Inventory:4,990
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Product details
Overview
TLF44773LAXUMA1 from Infineon Technologies is a dual-channel automotive-grade LDO voltage regulator in PG-TSON-14 package, delivering up to 300 mA per channel with adjustable output (3–20 V), dropout voltage < 300 mV at 300 mA, and integrated current monitoring via CSO1/CSO2/CSOx pins. It powers infotainment active antennas and surround-view cameras under permanent battery connection.
For engineers reviewing the TLF44773LAXUMA1 datasheet, TLF44773LAXUMA1 pinout, TLF44773LAXUMA1 application, or TLF44773LAXUMA1 equivalent, this device supports independent enable (EN1/EN2), fault-status reporting (ST1/ST2), analog current-sense diagnostics (CSOxSel-selectable), reverse polarity protection, and AEC-Q100 qualified operation from –40°C to 150°C junction temperature.
Technical Context
The TLF44773LAXUMA1 integrates two independent linear regulators with PMOS pass transistors, each featuring adjustable output voltage via external resistor dividers on ADJ1/ADJ2 and programmable current limit via RCSO1/RCSO2. Its current monitor architecture converts output current into proportional analog voltage at CSOx pins with selectable channel routing via CSOxSel.
Fault detection includes overvoltage, overtemperature, and overcurrent conditions reported simultaneously through dedicated open-drain status pins ST1/ST2 and encoded analog levels at CSOx. Thermal shutdown activates at Tj ≥ 165°C with automatic recovery, and reverse current flow is blocked by internal circuitry during input reversal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 300 mA per channel - supports high-current camera sensors and antenna LNAs without external boost stages. |
| Input Voltage Range | 5.5 V to 40 V - accommodates wide automotive battery transients including load dump (up to 45 V absolute max). |
| Output Voltage Range | 3 V to 20 V, adjustable - enables flexible rail generation for diverse SoCs, image sensors, and RF front-ends. |
| Dropout Voltage | < 300 mV at 300 mA - maintains regulation during cold-crank (6.5 V battery) with 3.3 V or 5 V outputs. |
| Current Sense Accuracy | ±5% full-scale error - enables precise real-time load monitoring for diagnostic logging and predictive failure analysis. |
| Thermal Shutdown Threshold | 165°C (typical), auto-recovery - protects against sustained overload or poor PCB heatsinking without latch-up. |
| Quiescent Current | 45 µA (typical) per channel enabled - minimizes standby drain in always-on automotive modules. |
| Package Thermal Resistance | RthJA = 45 K/W (PCB-mounted, 2-layer, 200 mm² copper) - enables 300 mA operation at TA ≤ 85°C without forced air. |
Pinout & Package
TLF44773LAXUMA1 uses the thermally enhanced PG-TSON-14 (exposed pad) package, optimized for automotive under-hood thermal environments. The exposed pad must be soldered to a dedicated GND-connected copper pour for optimal heat dissipation and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Q1, Q2 | Regulator output | Low-impedance power outputs; require ≥1 µF ceramic capacitor with ESR ≤10 Ω placed within 3 mm of pin. |
| ADJ1, ADJ2 | Voltage adjust reference | Connect external resistor divider to set nominal output voltage; bias current < 100 nA enables high-impedance dividers. |
| EN1, EN2 | Enable control | Active-high logic; internal pull-down allows floating disable; compatible with 3.3 V/5 V microcontroller GPIOs. |
| CSO1, CSO2 | Dedicated current sense | Analog voltage proportional to respective channel's output current; requires RC filter (RCSO=1.7–10.2 kΩ, CCSO=1–4.7 µF). |
| CSOx | Shared current sense/status | Selectable between Q1/Q2 via CSOxSel; tri-state capable - enables multiplexed ADC monitoring of multiple devices. |
| CSOxSel | CSOx channel selector | Logic input: low → CSOx = Q1, high → CSOx = Q2, threshold voltage = 0.8 V / 2.0 V - supports direct MCU control. |
| ST1, ST2 | Fault status indicator | Open-drain outputs pulled low during overvoltage, overtemperature, or overcurrent - interface directly with 3.3 V logic inputs. |
| I | IC supply input | Primary power input for internal circuitry; decoupling capacitor required close to pin to suppress supply noise coupling. |
| GND | Ground reference | Common return for all analog/digital functions; connects to exposed pad for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel enable/disable | EN1/EN2 allow dynamic power gating of individual rails - reduces system standby current by >90% when one channel is inactive. |
| Adjustable current limit | Set per-channel current limit via external RCSO resistor - enables precise short-circuit protection tuning without firmware changes. |
| Reverse polarity protection | Internal blocking prevents damage during battery misconnection - eliminates need for external series diode or MOSFET. |
| Stable with 1 µF ceramic output cap | Eliminates bulk tantalum capacitors - reduces BOM cost, board area, and failure risk from capacitor aging or ripple stress. |
| Automotive qualification | AEC-Q100 Grade 0 (–40°C to +150°C Tj) - validated for engine bay, head unit, and ADAS ECU deployment without derating. |
| Diagnostic-ready current sensing | CSOxSel-multiplexed analog current output enables single ADC channel to monitor both regulators - saves MCU resources and PCB traces. |
Applications
| Infotainment Active Antenna Power | Surround-View Camera Module |
|---|---|
|
Use Scenario: Powers GPS/GNSS and cellular diversity antennas in head units with continuous battery connection and transient-heavy 12 V supply. IC Role / Device Role / Timing Role: Dual-rail LDO supplying 3.3 V to GNSS receiver and 5 V to LTE modem, with independent enable for sleep/wake sequencing. Use Value: Reverse polarity and load-dump tolerance eliminate external protection components; current monitoring detects antenna cable faults before ECU reset. |
Use Scenario: Supplies image sensor and ISP in 360° camera systems mounted in door mirrors and bumpers, operating across full vehicle temperature range. IC Role / Device Role / Timing Role: Provides stable 1.8 V and 2.8 V rails to CMOS image sensors while enabling synchronized power-up via EN1/EN2 controlled by domain controller. Use Value: Low dropout ensures regulation during cold-crank; thermal shutdown prevents thermal runaway in sealed mirror housings. |
| Always-On Telematics Control Unit | ADAS Radar Power Management |
|
Use Scenario: Powers CAN transceiver, secure MCU, and cellular modem in telematics control units requiring zero-power-loss wake-on-CAN capability. IC Role / Device Role / Timing Role: Delivers 3.3 V to MCU and 5 V to modem; quiescent current < 45 µA per channel enables multi-year battery backup operation. Use Value: ST1/ST2 status pins feed directly into MCU interrupt lines for immediate fault response; CSO monitoring logs long-term current drift for predictive maintenance. |
Use Scenario: Supplies low-noise 1.2 V and 1.8 V rails to millimeter-wave radar SoCs in front bumper modules exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Regulates radar processor core and I/O supplies with independent thermal monitoring per channel via CSOx and ST pins. Use Value: Exposed-pad TSON-14 package achieves RthJA = 45 K/W on minimal copper - sustains 300 mA at 105°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST33T3G | Single-channel, fixed 3.3 V output, no current monitoring or status pins, 1 A max, TO-220 package | Lacks dual-rail flexibility, diagnostics, and AEC-Q100 Grade 0 rating; suitable only for non-critical cabin modules | Use only if single-rail, fixed-voltage, and non-diagnostic operation is acceptable and thermal budget permits TO-220 mounting. |
| TPS7B8250QDGNRQ1 | Dual-channel, 300 mA, adjustable output, but no CSOx multiplexing, no reverse polarity protection, MSOP-10 package | Missing reverse polarity hardening and shared CSOx capability - requires additional discrete protection and more ADC channels | Prefer when space-constrained layout prioritizes smaller footprint over diagnostic integration and robustness. |
Compared with NCP1117ST33T3G and TPS7B8250QDGNRQ1, TLF44773LAXUMA1 uniquely combines dual-channel adjustability, integrated reverse polarity protection, CSOxSel-multiplexed diagnostics, and AEC-Q100 Grade 0 qualification - making it the only solution meeting full ASIL-B supporting requirements for safety-critical always-on domains.
Availability
TLF44773LAXUMA1 is available at Aetrix Electronics and suitable for infotainment active antenna power supply, surround-view camera power supply, and always-on telematics control units requiring stable component supply across extended automotive lifecycles.
Supply support for TLF44773LAXUMA1 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 automotive qualification infrastructure.
The OPTIREG™ linear product line delivers AEC-Q100-qualified voltage regulators designed specifically for demanding automotive subsystems including ADAS, body electronics, and infotainment - emphasizing reliability, diagnostics, and thermal resilience.
FAQ
What is the minimum input voltage required for regulation at 5 V output?
The TLF44773LAXUMA1 requires VI ≥ VQ + Vdr, where Vdr is the dropout voltage. At 5 V output and 300 mA load, Vdr < 300 mV, so minimum input is 5.3 V. Functional range specifies VI > 5.5 V to ensure margin across temperature and process variation - verified per datasheet Table 3.
Can CSOx monitor both channels simultaneously without external multiplexing?
No. CSOx is a single-pin, time-shared output: CSOxSel selects either Q1 or Q2 channel for monitoring, or places CSOx in high-impedance state. Simultaneous dual-channel analog monitoring requires separate CSO1 and CSO2 connections - confirmed in Datasheet Rev. 1.01 Section 2.2 and Figure 1 block diagram.
Is the exposed thermal pad electrically connected to GND internally?
Yes. The exposed pad is internally tied to GND and must be soldered to a GND plane for both thermal performance and EMI suppression. Datasheet Section 9 explicitly states "Connect the exposed pad to GND" and lists it as part of the GND terminal in Table 1 - no isolation or voltage biasing is permitted.
Does ST1/ST2 assert low during startup before regulation is established?
No. ST1 and ST2 remain high-impedance (open-drain, pulled high externally) until regulation is achieved and internal monitors stabilize. Fault assertion occurs only after valid output voltage is detected and monitored - specified in Section 6.5 "Status output signal" and validated in typical startup waveforms (Datasheet Fig. 22).
TLF44773LAXUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TLF44773LAXUMA1 FAQ
1.How can I place an order for TLF44773LAXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLF44773LAXUMA1 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 TLF44773LAXUMA1 reliable?
The price and inventory of TLF44773LAXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLF44773LAXUMA1 is usually 5 days.
3.What payment methods are accepted for TLF44773LAXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLF44773LAXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLF44773LAXUMA1?
TLF44773LAXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLF44773LAXUMA1 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 TLF44773LAXUMA1?
For technical support, including TLF44773LAXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLF44773LAXUMA1 requirements.
6.How does Aetrix verify that TLF44773LAXUMA1 is sourced from the original manufacturer or authorized distributors?
All TLF44773LAXUMA1 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 TLF44773LAXUMA1 meets industry standards.
7.What is the process for return or replacement of TLF44773LAXUMA1?
All TLF44773LAXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLF44773LAXUMA1, 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 TLF44773LAXUMA1 part is unused and in its original packaging.
Return procedure for TLF44773LAXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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