Texas Instruments TLV1117-18CDCYG3

Overview

TLV1117-18CDCYG3 from Texas Instruments is a fixed-output, 1.8 V, 800 mA low-dropout linear voltage regulator in a 4-pin SOT-223 (DCY) package. It operates from 3.2 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 motor drive power rails and smart meter analog subsystems.

For engineers reviewing the TLV1117-18CDCYG3 datasheet, TLV1117-18CDCYG3 pinout, TLV1117-18CDCYG3 application, or TLV1117-18CDCYG3 equivalent, key selection criteria include dropout performance at full load, quiescent current in shutdown (1.5 µA typ.), thermal resistance (R_θJA = 95.4°C/W), and compatibility with 10 µF minimum output capacitance for stability.

Technical Context

The TLV1117-18CDCYG3 implements a CMOS-based LDO architecture with an internal 1.25 V reference and precision error amplifier. Its pass transistor uses a low-R_DS(on) design enabling 0.8 V dropout at 800 mA, and its foldback current limit activates below 50% of nominal output (0.9 V), reducing short-circuit dissipation.

It includes undervoltage lockout with 2.2 V rising threshold and 130 mV hysteresis, thermal shutdown at 180°C with 20°C hysteresis, and internal output pulldown (0.7–1.1 mA) to discharge VOUT during disable - all optimized for reliable operation in unregulated industrial input environments.

Key Specifications

Pinout & Package

TLV1117-18CDCYG3 is housed in a 4-pin SOT-223 (DCY) package with exposed thermal pad. The package measures 6.5 mm × 7 mm and provides moderate thermal performance suitable for board-level convection cooling without heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-18IDCYR, the TLV1117-18CDCYG3 offers identical electrical performance at lower cost for commercial-temperature applications, while the TPS7A2018PDQNR trades current capacity and thermal robustness for size and quiescent power - making TLV1117-18CDCYG3 optimal for cost-sensitive, thermally moderate 800 mA designs.

Availability

TLV1117-18CDCYG3 is available at Aetrix Electronics and suitable for motor drives, smart meters, HVAC controls, and home theater audio systems requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TLV1117-18CDCYG3 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 ICs, with decades of expertise in high-reliability linear regulators and industrial-grade power solutions.

The TLV1117 family was designed for cost-sensitive, high-volume industrial and consumer applications requiring robust fixed- and adjustable-output LDOs with integrated protection features and wide input voltage tolerance.

FAQ

What is the minimum input voltage required for TLV1117-18CDCYG3 to maintain regulation?

The TLV1117-18CDCYG3 requires a minimum input voltage of 3.2 V under recommended operating conditions. This accounts for its typical 0.8 V dropout at 800 mA load, ensuring stable 1.8 V output. At lighter loads, dropout decreases - e.g., 0.4 V at 500 mA - allowing operation down to ~2.2 V input, though 3.2 V is the guaranteed minimum per datasheet specifications for full-load regulation.

Does TLV1117-18CDCYG3 require an external capacitor on the ADJ pin?

No - the TLV1117-18CDCYG3 is a fixed-output variant and does not use the ADJ pin. Pin 1 is internally connected as GND. Unlike adjustable versions (e.g., TLV1117-ADJ), this part has no external feedback network; its 1.8 V output is set by internal resistor ratios, eliminating need for external resistors or capacitors on the ADJ terminal.

Can TLV1117-18CDCYG3 be used with ceramic output capacitors?

Yes - TLV1117-18CDCYG3 supports ceramic output capacitors, but requires careful ESR consideration. The new-chip version specifies a maximum output capacitor ESR of 500 mΩ. Standard X7R/X5R MLCCs (typically <10 mΩ ESR) are compatible when paired with a small series resistor (~100 mΩ) or used with ≥2.2 µF capacitance and proper layout to ensure phase margin and avoid oscillation.

What protection features are integrated into TLV1117-18CDCYG3?

The TLV1117-18CDCYG3 integrates four key protections: (1) foldback current limit (activates below 0.9 V output), (2) thermal shutdown (180°C trip, 160°C reset), (3) undervoltage lockout (2.2 V enable threshold with 130 mV hysteresis), and (4) internal output pulldown (0.7–1.1 mA) to discharge VOUT when disabled - all implemented without external components.

Is TLV1117-18CDCYG3 pin-compatible with older TLV1117 variants in SOT-223?

Yes - TLV1117-18CDCYG3 uses the standard 4-pin SOT-223 (DCY) footprint and pinout (GND–OUTPUT–INPUT–OUTPUT/tab) shared across TLV1117 fixed-output variants. It replaces legacy parts like TLV1117-18CDCY without PCB changes, while delivering improved dropout, lower IQ, and added protections inherent to the "new chip" silicon revision.