Infineon Technologies TLE46782LDXUMA1

Overview

TLE46782LDXUMA1 from Infineon Technologies is an automotive-grade monolithic low-dropout linear voltage regulator delivering a fixed 5 V ±2% output at up to 200 mA, featuring integrated reset and watchdog functions, reverse polarity protection, short-circuit and overtemperature shutdown, and operation across -40 °C to +150 °C junction temperature. It is designed for microcontroller power supply in engine control units, body electronics, and ADAS sensors.

For engineers reviewing the TLE46782LDXUMA1 datasheet, TLE46782LDXUMA1 pinout, TLE46782LDXUMA1 application, or TLE46782LDXUMA1 equivalent, key selection criteria include its programmable reset threshold (via RADJ), load-dependent watchdog activation (via WADJ), ultra-low dropout voltage, 45 V max input rating, and PG-TSON10 thermal performance with exposed pad.

Technical Context

The device integrates three core functional blocks: a precision 5 V LDO regulator with <1.2 V dropout at 200 mA, a voltage-sensing reset generator with adjustable delay (via capacitor on D pin) and switching threshold (via RADJ), and a positive-edge-triggered watchdog circuit with programmable activation current threshold (via WADJ). All protection features - reverse polarity, short-circuit, and thermal shutdown - are fully integrated and operate autonomously without external supervision.

Its PG-TSON10 package enables direct PCB heatsinking via the exposed pad, achieving R_thJA as low as 67 K/W with optimized 2s2p layout. The open-collector RO and WO outputs support flexible pull-up configurations to Q (5 V) or external rails, while WI accepts microcontroller watchdog pulses up to 1 MHz.

Key Specifications

Pinout & Package

Package: PG-TSON10 (3 mm × 3 mm, 0.65 mm pitch), thermally enhanced with exposed pad connected to GND for PCB heatsinking. RoHS-compliant, green product.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive LDO-with-supervision applications.

Compared with NCP380LSN33T2G and TLV70733PDQNR, TLE46782LDXUMA1 uniquely combines 5 V regulation, AEC-Q100 Grade 0 qualification, integrated programmable reset + watchdog, and -14 V to +45 V input tolerance - making it irreplaceable for safety-critical 5 V MCU power domains requiring autonomous fault detection.

Availability

TLE46782LDXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera ECUs requiring stable component supply under extended temperature and harsh electrical conditions.

Supply support for TLE46782LDXUMA1 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.

TLE46782LDXUMA1 belongs to Infineon's automotive power management portfolio, engineered specifically for robust, integrated power supply and supervision of microcontrollers in safety-critical vehicle subsystems.

FAQ

What is the minimum output capacitance required for stable operation?

The datasheet specifies a minimum 10 µF output capacitor with ≤3 Ω ESR at 10 kHz. This value accounts for worst-case ±30% capacitance tolerance and ensures phase margin >45° across temperature and load. Ceramic or low-ESR tantalum capacitors meeting these specs are recommended; aluminum electrolytics are not suitable due to ESR drift.

Can the watchdog function be disabled permanently?

Yes - connect WADJ (pin 5) directly to GND. This forces the watchdog into permanent disable mode regardless of load current. Alternatively, connecting WADJ to Q via a 270 kΩ resistor enables continuous watchdog operation. No configuration register or digital interface is involved; it is purely analog threshold-based.

Is external pull-up required on RO and WO pins?

No external pull-up is mandatory: both RO and WO have internal pull-up resistors to Q (5 V). However, an external pull-up to a higher voltage (e.g., 12 V) is permitted if interfacing with non-5 V logic. Leaving either pin unconnected is acceptable if the corresponding function is unused, as the open-collector structure prevents floating states.

How does reverse polarity protection operate?

Internal protection diodes block current flow when -14 V is applied to pin I, preventing damage to the regulator core. During reverse-battery events, the device draws <10 µA quiescent current and maintains zero output. No external components are needed - protection is inherent to the silicon design and validated per ISO 7637-2 Pulse 1 and Pulse 4a test profiles.