Texas Instruments TLV1117-15CDCYR

Overview

TLV1117-15CDCYR from Texas Instruments is a fixed-output, 1.5 V, 800 mA low-dropout linear voltage regulator in a 4-pin SOT-223 (DCY) package. It operates from 2.9 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 power rails for microcontrollers and sensors in industrial control modules.

For engineers reviewing the TLV1117-15CDCYR datasheet, TLV1117-15CDCYR pinout, TLV1117-15CDCYR application, or TLV1117-15CDCYR equivalent, this page provides verified electrical specs, thermal metrics, functional block context, and real-world design implications - including dropout behavior under load, UVLO hysteresis, and pulldown capability during disable.

Technical Context

The TLV1117-15CDCYR implements a CMOS-based LDO architecture with an internal 1.25 V reference and error amplifier driving a P-channel pass transistor. Its new-chip design enables operation down to a 1.5 V input-to-output differential and incorporates undervoltage lockout (UVLO rising threshold 2.2–2.4 V, hysteresis 130 mV) and thermal shutdown (trip at 180°C, reset at 160°C).

This variant is a fixed 1.5 V output version with no ADJ pin function - the Pin 1 terminal serves as GND. It uses foldback current limiting (ICL = 1.1–1.6 A, ISC = 150–350 mA) and features 65–110 µA quiescent current at zero load, dropping to ~1.5 µA in shutdown - enabling efficient standby operation in battery-backed systems.

Key Specifications

Pinout & Package

TLV1117-15CDCYR is housed in a 4-pin SOT-223 (DCY) package with exposed thermal pad (pin 4). The package measures 6.5 mm × 7 mm and uses standard SOT-223 PCB footprint with thermal via recommendations per TI SLVA388.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TES/V2 and MCP1703T-1502E/MB, TLV1117-15CDCYR uniquely balances 800 mA drive, integrated fault protection (UVLO, thermal shutdown, foldback), and industrial-grade thermal performance in a cost-effective SOT-223 package - making it optimal for non-automotive embedded systems demanding both current headroom and reliability.

Availability

TLV1117-15CDCYR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart meter sensor subsystems, HVAC controller mainboards, and home theater audio DSP cores requiring stable component supply with long-term manufacturability.

Supply support for TLV1117-15CDCYR 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 connectivity technologies, with decades of expertise in power management ICs.

The TLV1117 family targets cost-sensitive, high-reliability industrial and consumer power rails - delivering robust LDO performance with integrated protection features in compact packages for space-constrained designs.

FAQ

What is the minimum input voltage required for TLV1117-15CDCYR to maintain 1.5 V regulation at full 800 mA load?

The TLV1117-15CDCYR requires a minimum input voltage of 2.3 V to sustain regulation at 800 mA, based on its typical 0.8 V dropout voltage (V_DO) at that load. At higher temperatures or worst-case process corners, the maximum dropout may reach 1.2 V, so 2.7 V input is recommended for margin. This enables compatibility with single-cell LiFePO₄ batteries and low-voltage DC bus derivatives.

Does TLV1117-15CDCYR require an external resistor divider or adjustment components?

No, TLV1117-15CDCYR is a fixed-output variant - Pin 1 functions solely as GND, not ADJ. It contains internal feedback resistors set for 1.5 V output and requires no external components for voltage setting. Unlike adjustable TLV1117 versions, it eliminates layout complexity and resistor tolerance errors, simplifying design for dedicated 1.5 V rails.

How does the foldback current limit in TLV1117-15CDCYR protect the device during a short-circuit event?

During a short, TLV1117-15CDCYR transitions from brick-wall current limiting (1.1–1.6 A) to foldback mode when V_OUT drops below 0.75 V (50% of 1.5 V nominal). It then reduces output current to 150–350 mA, lowering power dissipation [(V_IN – V_OUT) × I_SC] and preventing thermal runaway. This allows safe, sustained short-circuit operation until fault clearance or thermal shutdown intervenes.

Can TLV1117-15CDCYR be used with ceramic output capacitors, and what ESR range is supported?

Yes, TLV1117-15CDCYR supports ceramic output capacitors. For stability, the datasheet specifies a maximum ESR of 500 mΩ (typical) and recommends ≥10 µF capacitance. Low-ESR MLCCs (e.g., 22 µF X5R 0805) are preferred; if using higher-ESR types (e.g., tantalum), adding a parallel 1 µF ceramic improves high-frequency transient response and phase margin.

What is the purpose of the output pulldown feature in TLV1117-15CDCYR, and when does it activate?

The output pulldown (0.7–1.1 mA sink) activates when TLV1117-15CDCYR is disabled - specifically when input voltage falls below the UVLO falling threshold (~1.9 V). It actively discharges the V_OUT node to GND, preventing floating voltages that could bias downstream FET gates or cause undefined logic states in powered-off subsystems - critical for clean power sequencing in multi-rail systems.