Texas Instruments TLV1117-25IDCYR

Overview

TLV1117-25IDCYR 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 TLV1117-25IDCYR datasheet, TLV1117-25IDCYR pinout, TLV1117-25IDCYR application, or TLV1117-25IDCYR equivalent, key selection criteria include dropout performance at full load, thermal resistance (RθJA = 95.4°C/W), quiescent current (65 µA typ), UVLO thresholds (2.2 V rising / 1.9 V falling), and compatibility with 100 µF output capacitance for stability.

Technical Context

The TLV1117-25IDCYR implements a CMOS-based LDO architecture with an internal 1.25 V bandgap reference and PMOS pass transistor. Its fixed 2.5 V output is trimmed at wafer test, eliminating external feedback resistors and enabling compact PCB layout. The device uses a hybrid brick-wall/foldback current limit that transitions at 1.25 V (50% of nominal output), delivering 1.1–1.6 A current limit and 150–350 mA short-circuit current.

Thermal protection activates at 180°C junction temperature with 20°C hysteresis (reset at 160°C), and undervoltage lockout ensures clean enable/disable sequencing. Soft-start reduces inrush current during startup, allowing use of smaller input capacitors without compromising reliability under hot-swap or battery-powered conditions.

Key Specifications

Pinout & Package

TLV1117-25IDCYR is housed in a 4-pin SOT-223 (DCY) package with exposed thermal pad on the underside. Pin 1 is ADJ/GND, Pin 2 is OUTPUT, Pin 3 is INPUT, and Pin 4 is OUTPUT (tied internally to Pin 2). The dual-output pins reduce trace resistance and improve current handling and thermal conduction to the PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-25IDCYR, TLV1117-25IKVUR offers superior thermal dissipation in space-tolerant layouts, while TPS7A4700RGWR trades simplicity and cost for ultra-low noise and higher current - neither is pin-compatible, and both require PCB redesign for substitution.

Availability

TLV1117-25IDCYR is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, home theater audio DSP, and HVAC system controller applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV1117-25IDCYR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TLV1117 product line delivers cost-optimized, thermally robust LDOs for industrial, appliance, and building automation systems - designed to replace legacy 78xx regulators with lower dropout, tighter accuracy, and integrated protection.

FAQ

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

The TLV1117-25IDCYR requires a minimum input voltage of 3.9 V to sustain 2.5 V output at full 800 mA load, per Recommended Operating Conditions. At lighter loads, the dropout voltage decreases - e.g., 0.4 V typical at 100 mA - allowing operation as low as 2.9 V input in low-current scenarios. This value is specified for the new-chip revision and confirmed in Section 5.3 of the datasheet.

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

No, TLV1117-25IDCYR does not use the ADJ pin - it is a fixed-output variant where Pin 1 functions solely as GND. The ADJ pin is only active in adjustable versions (e.g., TLV1117). For TLV1117-25IDCYR, no external components are needed on Pin 1 beyond connection to a solid ground plane, and no minimum load current is required for regulation stability.

What thermal derating applies to TLV1117-25IDCYR at 85°C ambient temperature?

With RθJA = 95.4°C/W, TLV1117-25IDCYR's maximum allowable power dissipation at TA = 85°C is PD = (125°C − 85°C) / 95.4°C/W ≈ 0.42 W. At 2.5 V output and 800 mA load, power dissipation is (VIN − 2.5 V) × 0.8 A; thus, VIN must remain ≤ 3.03 V to stay within thermal limits - confirming need for careful input voltage selection in high-ambient environments.

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

Yes, TLV1117-25IDCYR supports ceramic output capacitors, but requires attention to ESR: the recommended range is 2–500 mΩ. Standard X7R/X5R MLCCs often fall below 2 mΩ and may cause instability; adding a small series resistor (e.g., 10–50 mΩ) or using specialty low-ESR tantalum hybrids ensures phase margin compliance per Section 7.3 of the datasheet.

Is TLV1117-25IDCYR qualified for automotive applications?

No, TLV1117-25IDCYR is not AEC-Q100 qualified. It is rated for industrial temperature range (–40°C to 125°C junction), but lacks automotive-specific stress testing, failure-in-time (FIT) reporting, and PPAP documentation. For automotive use, TI recommends the pin-compatible TLV76725DRVR (AEC-Q100 Grade 1) or TPS7B8725QDDARQ1.