Texas Instruments TLV71721PDQNT

Overview

TLV71721PDQNT from Texas Instruments is a 150-mA, low-dropout linear regulator with 2.1-V fixed output voltage, 215-mV dropout at full load, 0.5% typical accuracy, and active pulldown for rapid output discharge. It delivers stable regulation in portable electronics where ultra-low quiescent current (35 µA) and foldback current limiting (40 mA short-circuit limit) are critical for battery life and fault safety.

For engineers reviewing the TLV71721PDQNT datasheet, TLV71721PDQNT pinout, TLV71721PDQNT application, or TLV71721PDQNT equivalent, key selection criteria include its 1-mm × 1-mm X2SON (DQN) package, 0.1-µF minimum stable output capacitance, 70-dB PSRR at 1 kHz, UVLO threshold of 1.6 V, and enable logic compatible with low-voltage GPIOs (EN high = ≥0.9 V).

Technical Context

The TLV71721PDQNT uses a PMOS pass transistor architecture enabling very low dropout and inherent reverse-current blocking via the body diode. Its foldback current limit initiates near 350 mA and reduces output current as VOUT collapses, limiting power dissipation during shorts to ~16 mW (40 mA × 0.4 V).

It integrates undervoltage lockout (1.6 V rising threshold), active pulldown (120-Ω resistor), and operates across –40°C to +85°C junction temperature. The device regulates with zero load and maintains 1.5% accuracy over temperature and line/load variations.

Key Specifications

Pinout & Package

Package: X2SON (DQN), 4-pin, 1.00 mm × 1.00 mm body size, thermal pad on bottom 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 TLS850F21TAV50 and MCP1703T-2102E/MB, the TLV71721PDQNT uniquely balances ultra-small footprint (1 mm²), sub-40-µA IQ, foldback protection, and 70-dB PSRR-making it optimal for space- and power-constrained portable electronics where reliability under fault conditions is non-negotiable.

Availability

TLV71721PDQNT is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, industrial handheld terminals, and medical point-of-care monitors requiring stable component supply with consistent parametric performance across production lots.

Supply support for TLV71721PDQNT 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 ICs and precision analog solutions.

The TLV717P series was designed specifically for portable, battery-powered applications demanding ultra-low quiescent current, small form factor, and robust fault protection-including foldback current limiting and active output discharge.

FAQ

What is the minimum input voltage required for TLV71721PDQNT to regulate 2.1 V at 150 mA?

The TLV71721PDQNT requires a minimum input voltage of 2.315 V to maintain regulation at 150 mA, calculated as VOUT + VDO = 2.1 V + 215 mV. Below this, the device enters dropout mode where output voltage tracks input minus dropout, degrading transient response and PSRR performance.

Does TLV71721PDQNT require an external pull-up resistor on the EN pin?

No, TLV71721PDQNT does not require an external pull-up on EN. Its enable input has CMOS-compatible thresholds (EN high ≥0.9 V, EN low ≤0.4 V) and draws only 0.01 µA leakage. For default-on operation, connect EN directly to IN; for controlled sequencing, drive EN from a GPIO or dedicated enable signal.

Can TLV71721PDQNT be used with a 0.1-µF output capacitor, and what type is recommended?

Yes, TLV71721PDQNT is stable with a 0.1-µF effective output capacitance. TI recommends X5R or X7R ceramic capacitors rated ≥6.3 V, placed within 2 mm of the OUT and GND pins. Ensure the effective capacitance-after accounting for DC bias and temperature derating-remains ≥0.1 µF; a 1-µF 0402 capacitor is commonly used to guarantee margin.

How does the foldback current limit in TLV71721PDQNT improve system reliability compared to a fixed current limit?

The foldback current limit in TLV71721PDQNT reduces output current as VOUT decreases during overload, limiting peak power dissipation in the PMOS pass element. At short-circuit (VOUT ≈ 0 V), it delivers only 40 mA instead of 150 mA-cutting worst-case power from 225 mW to 16 mW. This prevents thermal runaway and enables safe operation without external current-limiting components.

Is TLV71721PDQNT compatible with lead-free reflow profiles, and what is its MSL rating?

Yes, TLV71721PDQNT is RoHS-compliant and qualified for standard lead-free reflow. Its X2SON (DQN) package carries an MSL Level 1 rating per JEDEC J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to unlimited floor life-no baking required prior to assembly.