Texas Instruments TLV741285PDQNR

Overview

TLV741285PDQNR from Texas Instruments is a 2.85-V fixed-output, 150-mA low-dropout linear regulator (LDO) with foldback current limit, active output discharge, and 1% output accuracy. It operates from 1.4 V to 5.5 V input, delivers 230 mV dropout at 150 mA, consumes only 50 µA quiescent current, and is stable with 1-µF ceramic output capacitors - ideal for space-constrained battery-powered microcontroller power rails.

For engineers reviewing the TLV741285PDQNR datasheet, TLV741285PDQNR pinout, TLV741285PDQNR application, or TLV741285PDQNR equivalent, key selection criteria include its X2SON-4 package footprint, thermal shutdown (158°C), enable threshold (0.9 V), pulldown resistor (120 Ω), and foldback current limiting behavior under short-circuit conditions.

Technical Context

The TLV741285PDQNR uses a PMOS pass transistor enabling ultra-low dropout and reverse-current blocking via its intrinsic body diode. Its internal UVLO circuit disables regulation until VIN exceeds ~1.4 V, and its active pulldown circuit discharges the output through a 120-Ω resistor when disabled.

It implements foldback current limiting: output current reduces as VOUT collapses during overload, delivering ~40 mA into a short while limiting power dissipation. Thermal shutdown activates at 158°C and resets at 140°C, enabling fault cycling protection without external components.

Key Specifications

Pinout & Package

TLV741285PDQNR is packaged in a 4-pin X2SON (DQN) with 1.00 mm × 1.00 mm body size and exposed thermal pad electrically tied to GND. The thermal pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 174.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and MCP1702T-28502E/MB, TLV741285PDQNR uniquely balances 150-mA capability, 50-µA IQ, active discharge, foldback current limiting, and X2SON-4 footprint - making it optimal for compact, battery-powered systems requiring robust fault handling and rapid state transitions.

Availability

TLV741285PDQNR is available at Aetrix Electronics and suitable for wearable sensor nodes, industrial wireless transceivers, portable medical monitors, and edge AI microcontroller rails requiring stable component supply across production lifecycles.

Supply support for TLV741285PDQNR 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.

The TLV741P series was designed for ultra-low-power, space-constrained portable electronics - delivering high accuracy, low dropout, and integrated protection features in miniature packages like X2SON and SOT-23.

FAQ

What is the output voltage tolerance of TLV741285PDQNR over temperature?

The TLV741285PDQNR maintains ±1% output voltage accuracy across the full operating junction temperature range of –40°C to +125°C. This specification applies to all fixed-output versions including TLV741285PDQNR and ensures stable biasing for precision analog circuits and low-voltage logic without external trimming.

Does TLV741285PDQNR support active output discharge, and how does it work?

Yes, TLV741285PDQNR provides active output discharge via an internal 120-Ω pulldown resistor that engages when the EN pin falls below 0.4 V. This feature rapidly discharges the output capacitor, preventing residual voltage from causing unintended behavior in downstream circuitry - a key requirement in systems with strict power sequencing or safety reset protocols.

What is the minimum input voltage required for TLV741285PDQNR to regulate at full load?

At 150 mA output current and TJ ≤ 85°C, TLV741285PDQNR requires a minimum input voltage of 3.08 V (2.85 V + 230 mV dropout) to maintain regulation. Below this, the device enters dropout mode where VOUT tracks VIN minus R_DS(on) × IOUT - degrading PSRR and transient response.

Can TLV741285PDQNR be used with ceramic output capacitors smaller than 1 µF?

No - TLV741285PDQNR is specified and characterized for stable operation only with ≥1 µF ceramic output capacitance. Using smaller values risks oscillation or excessive overshoot during load transients. TI recommends X5R or X7R dielectrics for minimal ESR and temperature drift across the operating range.

How does the foldback current limit behave in TLV741285PDQNR during a short-circuit event?

During output short-circuit, TLV741285PDQNR reduces output current progressively as VOUT collapses - limiting peak power dissipation. At VOUT ≈ 0 V, it delivers ~40 mA (typical), significantly lower than its 150-mA rated output. This foldback behavior, combined with thermal shutdown at 158°C, prevents destructive overheating without requiring external current-sense circuitry.