Texas Instruments TLV71715PDQNT

Overview

TLV71715PDQNT from Texas Instruments is a 150-mA, low-dropout linear regulator with 1.5-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 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 protection.

For engineers reviewing the TLV71715PDQNT datasheet, TLV71715PDQNT pinout, TLV71715PDQNT application, or TLV71715PDQNT equivalent, key selection considerations include its 1-mm × 1-mm X2SON (DQN) package, stability with ≥0.1-µF ceramic 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 TLV71715PDQNT uses a PMOS pass transistor architecture enabling very low dropout voltage and inherent reverse-current blocking. Its foldback current limit initiates near 350 mA and reduces output current as VOUT collapses, limiting power dissipation during shorts to ~40 mA typical.

It integrates undervoltage lockout (1.6 V rising threshold), active pulldown (120-Ω internal resistor), and operates across –40°C to +85°C junction temperature. Input voltage range is 1.7 V to 5.5 V, supporting single-cell Li-ion, Li-polymer, and multi-cell alkaline/battery systems.

Key Specifications

Pinout & Package

TLV71715PDQNT is housed in a 4-pin, 1.00 mm × 1.00 mm X2SON (DQN) package with an 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 low-dropout regulator applications.

Compared with TLS850F1L1VXUMA1 and MCP1804T-1502I/OT, TLV71715PDQNT uniquely combines ultra-low IQ (35 µA), active pulldown, foldback current limiting, and 1.7-V minimum input-making it the only choice for space- and energy-constrained portable systems needing comprehensive fault protection.

Availability

TLV71715PDQNT is available at Aetrix Electronics and suitable for smartphones, wearable sensors, industrial handheld terminals, and medical patch monitors requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TLV71715PDQNT 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 footprint, and robust fault protection-including foldback current limiting and active output discharge.

FAQ

What is the minimum input voltage required for TLV71715PDQNT to regulate 1.5 V output?

The TLV71715PDQNT requires a minimum input voltage of 1.715 V to maintain regulation at 150 mA load, based on its 215-mV dropout specification. Below this, the device enters dropout mode where VOUT ≈ VIN – VDO. The absolute minimum input before UVLO disables regulation is 1.6 V.

Does TLV71715PDQNT require an input capacitor for stability?

No, the TLV71715PDQNT does not require an input capacitor for stability, but Texas Instruments recommends a 0.1–1 µF low-ESR ceramic capacitor between IN and GND to improve transient response, reduce ripple, and counteract reactive source impedances-especially when the regulator is remote from the power source.

How does the foldback current limit function in TLV71715PDQNT during a short circuit?

During a short circuit, the TLV71715PDQNT's foldback current limit reduces output current to ~40 mA typical, rather than sustaining a fixed 150-mA limit. This lowers power dissipation [(VIN – VOUT) × I_LIMIT] in the PMOS pass element, preventing thermal damage and minimizing input supply droop.

Can TLV71715PDQNT be used with ceramic capacitors smaller than 1 µF?

Yes-TLV71715PDQNT is stable with an effective output capacitance of ≥0.1 µF. This allows use of smaller-case X5R/X7R ceramics (e.g., 0402 or 0603) that retain ≥0.1 µF under operating bias and temperature, enabling compact, cost-effective designs where 1-µF is unnecessary.

What is the purpose of the active pulldown circuit in TLV71715PDQNT?

The active pulldown circuit in TLV71715PDQNT provides a 120-Ω path from OUT to GND when the device is disabled (EN < 0.4 V). This rapidly discharges output capacitance, preventing floating voltages that could cause unintended wake-up, latch-up, or timing violations in downstream logic or analog circuitry.