Texas Instruments TLV71328PDQNR

Overview

TLV71328PDQNR from Texas Instruments is a capacitor-free, 150-mA low-dropout linear regulator with fixed 2.8-V output, 1% accuracy, 230-mV dropout at full load, 50-µA quiescent current, and foldback overcurrent protection-designed for space-constrained portable devices requiring stable low-noise power delivery.

For engineers reviewing the TLV71328PDQNR datasheet, TLV71328PDQNR pinout, TLV71328PDQNR application, or TLV71328PDQNR equivalent, key selection considerations include its X2SON-4 package footprint, capacitor-less stability, thermal shutdown at 158°C, active discharge capability (P suffix), and compatibility with 1.4–5.5-V input rails in battery-powered systems.

Technical Context

The TLV71328PDQNR implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking without external diodes. Its internal foldback current limit reduces power dissipation during overload by lowering output current as voltage collapses-critical for Li-ion battery protection.

It features an enable input with 0.9-V logic-high threshold and 0.4-V logic-low threshold, integrated thermal shutdown (trip at 158°C, hysteresis 18°C), and stable operation with zero output capacitance-eliminating mandatory COUT while remaining compatible with up to 100-µF ceramic capacitors for enhanced transient response.

Key Specifications

Pinout & Package

TLV71328PDQNR uses the 1.0 mm × 1.0 mm, 4-pin X2SON (DQN) package with wettable flank terminations for automated optical inspection. The thermal pad is internally connected to GND and must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 208.2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F2BHTSA1 and MCP1702T-2802E/MB, TLV71328PDQNR uniquely balances ultra-low IQ, capacitor-free operation, active discharge, and foldback protection in a 1-mm² footprint-making it optimal for space- and battery-life-constrained portable electronics where all four features are concurrently required.

Availability

TLV71328PDQNR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, industrial handheld scanners, and smart wearable trackers requiring stable component supply with guaranteed long-term availability.

Supply support for TLV71328PDQNR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies with over 90 years of innovation in power management and signal chain solutions.

The TLV713 series was developed specifically for portable, battery-powered applications demanding minimal board area, ultra-low quiescent current, and robust protection features-targeting wearables, IoT endpoints, and handheld consumer electronics.

FAQ

What is the minimum input voltage required for TLV71328PDQNR to maintain regulation?

The TLV71328PDQNR requires a minimum input voltage of 2.8 V + dropout voltage. At 150 mA and TJ ≤ 85°C, dropout is 230 mV, so VIN(min) = 3.03 V. Over temperature (–40°C to 125°C), worst-case dropout rises to 540 mV, requiring VIN ≥ 3.34 V for full-load regulation. Below these thresholds, output voltage drops linearly with input.

Does TLV71328PDQNR require an output capacitor to operate stably?

No, TLV71328PDQNR is designed for stable operation with 0 µF output capacitance-enabling capacitor-free designs. However, adding a 1-µF ceramic capacitor between OUT and GND improves load transient response and reduces output voltage deviation during step-load changes, especially above 50 mA.

What does the 'P' in TLV71328PDQNR signify?

The 'P' suffix in TLV71328PDQNR indicates inclusion of an active pulldown circuit on the OUT pin. When EN is driven low, an internal 120-Ω resistor connects OUT to GND, discharging any attached capacitance rapidly-critical for power sequencing, avoiding floating voltages, and meeting strict reset timing in multi-rail systems.

How does the foldback current limit function in TLV71328PDQNR during a short circuit?

Under short-circuit conditions, TLV71328PDQNR reduces output current progressively as output voltage collapses-limiting peak power dissipation. For example, at VOUT ≈ 0.5 V, current drops to ~40 mA (ISC), preventing thermal runaway and allowing safe recovery once the fault is removed, unlike constant-current limiters that sustain high power.

Can TLV71328PDQNR be used with a 1.8-V input supply?

No. TLV71328PDQNR has a minimum input voltage specification of 1.4 V, but its dropout voltage at 150 mA is ≥230 mV. With a 1.8-V input, maximum sustainable output is 1.8 V – 0.23 V = 1.57 V-insufficient to regulate 2.8 V. It requires VIN ≥ 3.03 V (at room temperature) to deliver rated 2.8-V output at full load; TLV71318PDQNR would be appropriate for 1.8-V output.