Infineon Technologies TLF2931GV33XUMA1

Overview

TLF2931GV33XUMA1 from Infineon Technologies is an AEC-Q100 qualified low-dropout linear voltage regulator delivering 3.3 V ±3% output at up to 100 mA, with dropout voltage as low as 0.85 V at 100 mA and quiescent current ≤1 mA at 10 mA load. It features reverse-battery protection, overtemperature shutdown, and mirror-image insertion tolerance in PG-DSO-8 package. Used for automotive body control modules requiring stable 3.3 V supply under cold-crank conditions.

For engineers reviewing the TLF2931GV33XUMA1 datasheet, TLF2931GV33XUMA1 pinout, TLF2931GV33XUMA1 application, or TLF2931GV33XUMA1 equivalent, key selection criteria include dropout performance at 100 mA, reverse-polarity robustness to –30 V, thermal resistance (R_thJA = 96 K/W), and AEC-Q100 qualification for under-hood deployment.

Technical Context

The TLF2931GV33XUMA1 implements a bandgap-referenced error amplifier driving a PNP pass transistor with saturation control logic. Its protection architecture integrates dedicated temperature sensing, current-limit foldback, and reverse-voltage blocking via internal diode structure - not external components.

Functional range requires input voltage between 4.4 V and 26 V for 3.3 V output regulation, with guaranteed operation across –40 °C to +125 °C junction temperature. Dropout behavior is specified at 100 mV output deviation, and PSRR remains ≥80 dB at 120 Hz ripple frequency.

Key Specifications

Pinout & Package

TLF2931GV33XUMA1 is housed in PG-DSO-8 (8-pin exposed-pad SOIC) package, with pins 2,3,6,7 internally bonded to GND and thermally connected to the exposed pad for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TLF2931GV50XUMA1, the TLF2931GV33XUMA1 provides tighter output tolerance for modern 3.3 V MCUs, while MAX1725EUT33+T trades automotive ruggedness for ultra-low I_q - making it unsuitable for under-hood use despite superior dropout.

Availability

TLF2931GV33XUMA1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument clusters, door modules, and telematics control units requiring stable component supply under AEC-Q100 compliance and extended temperature operation.

Supply support for TLF2931GV33XUMA1 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 TLF2931 product line delivers AEC-Q100-compliant linear regulators optimized for automotive subsystems needing high fault tolerance, reverse-battery resilience, and low-quiescent-current standby operation.

FAQ

What is the minimum input voltage required for regulation at full 100 mA load?

The TLF2931GV33XUMA1 requires a minimum input voltage of 4.4 V to maintain 3.3 V output regulation at 100 mA load, as defined in its functional range. Below this, dropout occurs and output voltage drops linearly with input. This threshold ensures reliable operation during automotive cold-crank events down to 6 V battery voltage.

Does the device require an external capacitor on the IN pin?

Yes - a capacitor of ≥1 µF ceramic placed between IN (pin 8) and GND (pins 2/3/6/7) within 5 mm of the IC is mandatory for stability and transient response. The datasheet recommends low-ESR types and specifies that omission causes oscillation or startup failure under load-step conditions.

Can TLF2931GV33XUMA1 be used without the exposed thermal pad soldered?

No - the PG-DSO-8 package's exposed pad is electrically and thermally connected to GND and serves as the primary heat conduction path. Leaving it unsoldered increases R_thJA beyond 96 K/W, causing junction temperature to exceed 125 °C at >30 mA load, triggering thermal shutdown and violating AEC-Q100 thermal requirements.

Is the "n.c." marking on pins 4 and 5 absolute, or can they be grounded?

Pins 4 and 5 are unconnected internally - no bond wire, no circuit node. Grounding them creates parasitic capacitance and may induce noise coupling into adjacent GND paths. The datasheet explicitly prohibits connection; doing so risks instability, increased EMI, and invalidates AEC-Q100 test coverage for ESD and latch-up immunity.