Texas Instruments TLV1117-25CDCYRG3

Overview

TLV1117-25CDCYRG3 from Texas Instruments is a fixed-output, 2.5 V, 800 mA low-dropout linear voltage regulator in a 4-pin SOT-223 (DCY) package. It operates from 3.9 V to 15 V input, delivers ±1.0% output accuracy at 25°C, features 0.8 V typical dropout at 800 mA (new chip), and integrates foldback current limit, thermal shutdown, UVLO, and internal soft-start - used in industrial power rails for microcontrollers and sensors.

For engineers reviewing the TLV1117-25CDCYRG3 datasheet, TLV1117-25CDCYRG3 pinout, TLV1117-25CDCYRG3 application, or TLV1117-25CDCYRG3 equivalent, key selection criteria include dropout performance at full load, thermal behavior in SOT-223, UVLO thresholds (2.2 V rising / 1.9 V falling), and compatibility with 100 µF tantalum or low-ESR ceramic output capacitors.

Technical Context

The TLV1117-25CDCYRG3 is a CMOS-based LDO with a P-channel pass transistor enabling low dropout. Its internal 1.25 V bandgap reference and error amplifier regulate output by comparing feedback (internal for fixed versions) against VREF. The new-chip architecture includes dedicated UVLO circuitry with 130 mV hysteresis and foldback current limiting triggered when VOUT drops below 1.25 V (50% of nominal 2.5 V).

Thermal management relies on junction-to-ambient resistance of 95.4°C/W (RθJA) in the DCY package, requiring PCB copper area for heat spreading. Soft-start reduces inrush current during startup, allowing smaller input capacitance; output pulldown (0.7–1.1 mA) ensures controlled discharge when disabled.

Key Specifications

Pinout & Package

TLV1117-25CDCYRG3 uses the 4-pin SOT-223 (DCY) package with exposed thermal pad (pin 4). Pin 1 is GND (for fixed-output variants), pin 2 is OUTPUT, pin 3 is INPUT, and pin 4 is thermal pad (internally connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Compared with TLV1117-25CDCYRG3, TLV1117-25IDCYR offers extended temperature capability without layout change, while TPS7A4700RGWR trades fault protection and wide-input flexibility for superior noise performance at lower current - making it unsuitable as a drop-in replacement in safety-critical or wide-VIN industrial designs.

Availability

TLV1117-25CDCYRG3 is available at Aetrix Electronics and suitable for industrial motor control, smart metering, HVAC sensor nodes, and home theater audio systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV1117-25CDCYRG3 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of LDO design heritage and broad industrial qualification.

The TLV1117 product line targets cost-sensitive, high-reliability industrial and consumer power management applications - delivering robust fixed/adjustable LDOs with integrated protection, optimized for PCB space and thermal constraints in SOT-223 and TO-252 packages.

FAQ

What is the minimum input voltage required for TLV1117-25CDCYRG3 to maintain regulation?

The TLV1117-25CDCYRG3 requires a minimum input voltage of 3.9 V per its Recommended Operating Conditions table. This accounts for worst-case dropout (up to 1.2 V at 800 mA, 125°C) plus the 2.5 V nominal output. At room temperature and light load, regulation may hold down to ~3.3 V, but 3.9 V is the guaranteed minimum for full-spec operation across temperature and load.

Does TLV1117-25CDCYRG3 require an external capacitor on the ADJ pin?

No - TLV1117-25CDCYRG3 is a fixed-output variant; the ADJ pin is internally connected to GND and functions solely as the ground terminal (Pin 1). No external components are needed on this pin. The datasheet confirms Pin 1 is labeled "ADJ/GND" and serves as GND for all fixed-output versions including TLV1117-25CDCYRG3.

Can TLV1117-25CDCYRG3 be used with ceramic output capacitors?

Yes, TLV1117-25CDCYRG3 supports ceramic output capacitors. The datasheet specifies a minimum 10 µF output capacitance with ESR between 2 mΩ and 500 mΩ. X7R or X5R 10–22 µF ceramics meet this requirement and improve transient response versus tantalum. Avoid NP0/C0G below 10 µF due to insufficient capacitance.

What thermal derating applies to TLV1117-25CDCYRG3 in SOT-223 without a heatsink?

In the DCY (SOT-223) package, TLV1117-25CDCYRG3 has RθJA = 95.4°C/W. With 25°C ambient and max TJ = 125°C, maximum continuous power dissipation is (125 – 25)/95.4 ≈ 1.05 W. At 2.5 V output and 800 mA load, power dissipation is (VIN – 2.5 V) × 0.8 A - so VIN must stay ≤ 3.8 V for full-load operation without forced cooling or PCB copper enhancement.

How does the foldback current limit behave during a short-circuit event on TLV1117-25CDCYRG3?

During a short circuit, TLV1117-25CDCYRG3 limits output current to 150–350 mA (ISC), scaling down from its 1.1–1.6 A brick-wall limit once VOUT falls below 1.25 V (50% of 2.5 V). This foldback reduces power dissipation [(VIN – 0) × ISC] versus constant-current limiting, delaying thermal shutdown and enabling safer fault recovery in industrial systems.