Infineon Technologies TLF4277ELXUMA1

Overview

TLF4277ELXUMA1 from Infineon Technologies is an AEC-Q100 qualified automotive-grade low-dropout linear voltage regulator with integrated current monitor, adjustable 5–12 V output, 200 mA load capability, 40 V max input, and reverse-polarity protection-designed specifically for active antenna power in car infotainment systems.

For engineers reviewing the TLF4277ELXUMA1 datasheet, TLF4277ELXUMA1 pinout, TLF4277ELXUMA1 application, or TLF4277ELXUMA1 equivalent, key selection considerations include its diagnostic current-sense output (CSO), adjustable overcurrent limit, overvoltage detection, thermal shutdown behavior, and PG-SSOP14 EP package thermal performance under automotive ambient conditions.

Technical Context

The TLF4277ELXUMA1 integrates a precision bandgap reference, adjustable linear regulator stage, and dual-path current monitoring: one path senses shunt voltage across external RCS1 for load current measurement, another monitors CS2–CS1 differential voltage for fault detection. Its enable-controlled startup and shutdown sequence supports battery-permanent automotive subsystems.

Protection logic combines analog comparators for overvoltage (VQ > 13.5 V), overtemperature (Tj > 160 °C), and short-circuit conditions, all signaled via the open-drain CSO pin. The ADJ pin interfaces with a two-resistor divider to set output voltage, while EN provides TTL-compatible control with internal pull-down.

Key Specifications

Pinout & Package

TLF4277ELXUMA1 uses the PG-SSOP14 EP (exposed paddle) package-a thermally enhanced 14-pin SSOP variant with 0.65 mm pitch and integrated thermal pad for PCB heat sinking. The exposed paddle must be soldered to a dedicated GND-connected copper area for R_thJA ≤ 55 K/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLF4277ELXUMA1, TLF4935D0EJXUMA1 trades adjustability and monitoring for lower cost and quiescent current, while MAX16922ATP+T adds digital configurability at the expense of analog diagnostic simplicity and package compatibility.

Availability

TLF4277ELXUMA1 is available at Aetrix Electronics and suitable for automotive sensor supply, active antenna modules, and battery-permanent peripheral power applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for TLF4277ELXUMA1 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 TLF4277ELXUMA1 belongs to Infineon's OPTIREG™ linear regulator product line-designed explicitly for robust, diagnostic-capable power delivery in automotive infotainment and telematics subsystems.

FAQ

What is the minimum input voltage required for regulation at 12 V output?

The TLF4277ELXUMA1 requires a minimum input voltage of 12.3 V to maintain 12 V output at 200 mA load, based on its typical 300 mV dropout voltage. At lighter loads, regulation is possible down to 12.1 V input. Below this, output voltage drops linearly with input.

How is the current limit adjusted, and what is its accuracy?

The output current limit is set by the external resistor RCS1 connected between CS1 and CS2; values from 100 Ω to 1000 Ω configure limits from ~150 mA to ~250 mA. The limit has ±15% tolerance over temperature and process variation, as specified in the datasheet's electrical characteristics table.

Can the CSO pin drive an LED directly for fault indication?

No-the CSO pin is an open-drain analog output with ±5% gain accuracy and 0–5 V output swing. It requires an external pull-up resistor and an op-amp or comparator to drive an LED; direct LED connection would distort the diagnostic voltage and violate CSO's 5 V absolute maximum rating.

Is the exposed thermal pad electrically isolated from other pins?

Yes-the exposed paddle (PAD, pin 14) is internally connected only to GND. It must be soldered exclusively to a GND copper pour and must not contact any other net. Electrical isolation is confirmed in Infineon's package drawing PG-SSOP14 EP and thermal test reports.