Texas Instruments TLV71728PDQNR3

Overview

TLV71728PDQNR3 from Texas Instruments is a 150-mA, low-dropout linear regulator with 2.8 V fixed output, 215 mV dropout at full load, 0.5% typical output accuracy, and active pulldown for rapid output discharge. It delivers stable regulation in space-constrained portable electronics where low quiescent current (35 µA) and foldback current limiting are critical.

For engineers reviewing the TLV71728PDQNR3 datasheet, TLV71728PDQNR3 pinout, TLV71728PDQNR3 application, or TLV71728PDQNR3 equivalent, key selection criteria include dropout performance under 150 mA load, PSRR at 1 kHz (65 dB), stability with ≥0.1 µF ceramic output capacitance, enable threshold compatibility with low-voltage GPIOs, and thermal resistance (RθJA = 393.3°C/W) in the 1-mm × 1-mm X2SON package.

Technical Context

The TLV71728PDQNR3 uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing power dissipation during faults.

It integrates undervoltage lockout (UVLO = 1.6 V), an active-high enable pin with 0.9 V turn-on threshold, and an internal 120 Ω pulldown resistor that discharges the output when disabled - all operating across –40°C to +85°C junction temperature.

Key Specifications

Pinout & Package

TLV71728PDQNR3 is housed in a 4-pin, 1.0 mm × 1.0 mm X2SON (DQN) package with exposed thermal pad connected to GND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV71728PDQNR3, TPS7A0528PDQNR offers lower dropout and IQ but sacrifices foldback current limiting and active output discharge - making it less suitable for battery-powered systems requiring fault resilience and precise power sequencing.

Availability

TLV71728PDQNR3 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hub supply, and industrial handheld terminal applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLV71728PDQNR3 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The TLV717P series was developed specifically for portable electronics requiring ultra-small footprint, low IQ, and robust fault handling - targeting battery-powered devices where efficiency, size, and reliability are co-prioritized.

FAQ

What is the maximum input voltage rating for TLV71728PDQNR3?

The absolute maximum input voltage for TLV71728PDQNR3 is 6 V, but the recommended operating range is 1.7 V to 5.5 V. Exceeding 6 V risks permanent damage per the Absolute Maximum Ratings table. For reliable operation in battery-powered systems, keep VIN ≤ 5.5 V - especially important when using fully charged 2-cell Li-ion packs or unregulated wall adapters.

Does TLV71728PDQNR3 require an input capacitor?

While TLV71728PDQNR3 is stable without an input capacitor, Texas Instruments recommends a 0.1 µF to 1 µF low-ESR ceramic capacitor between IN and GND. This improves transient response, reduces noise coupling from upstream sources, and prevents instability when source impedance exceeds 2 Ω - common in long PCB traces or high-impedance DC/DC outputs.

How does the foldback current limit function in TLV71728PDQNR3?

In TLV71728PDQNR3, foldback current limiting reduces output current as V_OUT drops - initiating near 350 mA and tapering to ~40 mA under short-circuit conditions. This behavior lowers power dissipation in the PMOS pass element during faults, preventing thermal runaway. Unlike fixed current limits, foldback maintains safer junction temperatures during sustained overloads or output shorts.

Can TLV71728PDQNR3 operate with a 0.1 µF output capacitor?

Yes - TLV71728PDQNR3 is explicitly designed to be stable with an effective output capacitance of ≥0.1 µF, including derating due to DC bias and temperature. However, TI recommends a 1 µF X5R/X7R ceramic capacitor for typical designs to ensure margin. A 0.1 µF rated capacitor may fall below 0.1 µF effective value under bias and thus fail to guarantee stability.

What is the purpose of the thermal pad on the TLV71728PDQNR3 DQN package?

The exposed thermal pad on the TLV71728PDQNR3's X2SON package must be soldered to a PCB ground plane to improve thermal performance. It reduces RθJA from 393.3°C/W (no pad connection) to ~330°C/W (with proper pad-to-plane connection), enabling higher continuous output current in thermally constrained layouts - essential for sustained 150 mA operation in sealed enclosures.