Infineon Technologies TLS805B1SJVXUMA1

Overview

TLS805B1SJVXUMA1 from Infineon Technologies is an AEC-Q100 qualified adjustable linear voltage regulator for automotive battery-connected systems, delivering 50 mA output current with ultra-low 5 µA quiescent current, 100 mV typical dropout at full load, and operation down to 2.75 V input-enabling cranking-mode functionality in transceiver, sensor, and gateway supplies.

For engineers reviewing the TLS805B1SJVXUMA1 datasheet, TLS805B1SJVXUMA1 pinout, TLS805B1SJVXUMA1 application, or TLS805B1SJVXUMA1 equivalent, key selection criteria include ultra-low IQ for always-on systems, wide 2.75–42 V input range, enable-controlled off-state (<1 µA), thermal shutdown, and ADJ-pin-based output voltage configuration requiring external resistor divider.

Technical Context

The TLS805B1SJVXUMA1 implements a bandgap-referenced feedback loop with adjustable output via external resistive divider on the ADJ pin, supporting precise output setting across temperature and load. Its regulation architecture maintains stability with only 1 µF ceramic output capacitor (ESR ≤ 100 Ω), eliminating need for large electrolytics.

Internal protection includes foldback current limiting that reduces output voltage during overcurrent events and thermal shutdown that disables the pass transistor above 150°C junction temperature-restarting automatically after cooldown. The EN pin features integrated pull-down and accepts TTL/CMOS-compatible logic levels.

Key Specifications

Pinout & Package

Delivered in PG-DSO-8 package (exposed thermal pad, RoHS-compliant, AEC-Q100 qualified), with 8-pin SOIC footprint optimized for automotive thermal and reliability requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable automotive LDO applications.

Compared with TLV73350PDBVR and MAX1725EUT+T, TLS805B1SJVXUMA1 uniquely combines AEC-Q100 qualification, adjustable output, 5 µA IQ, and cranking-capable 2.75 V start-up-making it the sole choice for next-generation automotive always-on subsystems requiring flexibility and longevity.

Availability

TLS805B1SJVXUMA1 is available at Aetrix Electronics and suitable for automotive infotainment, body electronics, and chassis control systems requiring stable component supply under extended temperature, cranking, and load-dump conditions.

Supply support for TLS805B1SJVXUMA1 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 leader specializing in power management, automotive ICs, and security solutions, with global manufacturing and automotive qualification expertise.

The OPTIREG™ linear regulator product line targets automotive power systems requiring AEC-Q100 compliance, ultra-low IQ, and robust transient performance-designed specifically for battery-connected always-on ECUs.

FAQ

What is the minimum input voltage required for regulation?

The TLS805B1SJVXUMA1 begins regulation at 2.75 V input-enabling operation during engine cranking when battery voltage collapses to ~4.5 V or lower. Below this threshold, output tracks input minus dropout until reaching zero. This extended low-input capability is confirmed in Functional Range Table 3 of the official Infineon datasheet Rev. 1.21.

How is output voltage set, and what reference voltage is used?

Output voltage is set externally using a resistor divider between Q (output), ADJ, and GND. The internal reference voltage at the ADJ pin is 1.25 V ±1.5%, so V_OUT = 1.25 V × (1 + R1/R2). This configuration allows precise adjustment to 3.3 V, 5.0 V, or other values while maintaining ±2% total accuracy over temperature and load.

Does the device require an input capacitor for stability?

No input capacitor is required for loop stability, but a 100 nF ceramic capacitor placed close to the I pin is recommended to suppress high-frequency line noise and transients-especially when connected directly to the vehicle battery rail. This recommendation is specified in Pin Definition Table 1 and Application Information Section 5.2.1 of the datasheet.

What thermal derating applies at elevated ambient temperatures?

Derating follows R_thJA = 114 K/W (2s2p board). At 85°C ambient, maximum continuous power dissipation is ~0.57 W before reaching 150°C junction limit. For 50 mA output at 42 V input (worst-case ΔV = 37 V), power dissipation reaches 1.85 W-requiring either reduced load, forced air, or PCB copper area expansion per Thermal Resistance Table 4.