Texas Instruments TLV717285PDQNR

Overview

TLV717285PDQNR from Texas Instruments is a 150-mA, low-dropout linear regulator with 2.85 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 such as smartphones and wearables where low quiescent current (35 µA) and foldback current limiting are critical.

For engineers reviewing the TLV717285PDQNR datasheet, TLV717285PDQNR pinout, TLV717285PDQNR application, or TLV717285PDQNR equivalent, key selection considerations 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 TLV717285PDQNR 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 (1.6 V rising threshold), active-pulldown circuitry (120 Ω internal resistor), and operates across –40°C to +85°C junction temperature. Stability is guaranteed with ≥0.1 µF effective ceramic output capacitance, supporting compact, cost-effective bias-tolerant capacitors.

Key Specifications

Pinout & Package

TLV717285PDQNR 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 LDO regulator applications.

Compared with TLS850F28V50 and TPS7A05285PDBVR, TLV717285PDQNR offers the smallest footprint (1 mm²), balanced IQ/dropout trade-off, and foldback current limiting-making it optimal for consumer portable designs where space, battery life, and robustness under intermittent faults are prioritized.

Availability

TLV717285PDQNR is available at Aetrix Electronics and suitable for smartphone power rails, wearable sensor subsystems, industrial handheld terminals, and point-of-sale peripherals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLV717285PDQNR 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 TLV717xx series was designed specifically for portable, battery-powered applications demanding ultra-low IQ, small size, and robust fault protection-enabling longer runtime and higher integration in space-constrained devices.

FAQ

What is the minimum output capacitance required for stable operation of TLV717285PDQNR?

The TLV717285PDQNR is stable with an effective output capacitance of 0.1 µF or greater. This refers to the capacitance value under actual operating bias voltage and temperature-not the nominal rated value. TI recommends using a 1-µF X5R or X7R ceramic capacitor for robust performance, but smaller 0.1-µF units may suffice if derating is accounted for. TLV717285PDQNR's ability to operate stably with such low capacitance enables use of compact, cost-effective capacitors in area-sensitive designs.

Does TLV717285PDQNR include reverse-current protection?

Yes, TLV717285PDQNR incorporates reverse-current protection via its PMOS pass transistor architecture, which inherently blocks current flow from OUT to IN when VOUT exceeds VIN. However, the internal body diode conducts uncontrolled current under extended reverse-voltage conditions, so TI recommends external current limiting to ≤5% of rated output current if sustained reverse bias is expected. This design feature prevents backfeeding and protects upstream supplies, making TLV717285PDQNR suitable for multi-rail systems.

What is the purpose of the active pulldown circuit in TLV717285PDQNR?

The active pulldown circuit in TLV717285PDQNR is a 120 Ω internal resistor that connects OUT to GND when the device is disabled (EN < 0.4 V). This rapidly discharges output capacitance, preventing floating voltages that could cause downstream ICs to latch up, generate false interrupts, or retain invalid states. In battery-powered systems, this feature ensures predictable shutdown behavior and eliminates residual charge that might delay system reset or increase leakage. TLV717285PDQNR's pulldown is integrated-no external components are needed.

How does the foldback current limit in TLV717285PDQNR differ from a fixed current limit?

TLV717285PDQNR's foldback current limit reduces output current as output voltage decreases-unlike a fixed limit that maintains constant current until shutdown. When the output is shorted, TLV717285PDQNR delivers ~40 mA instead of 150 mA, significantly lowering power dissipation [(VIN – VOUT) × ILIMIT] in fault conditions. This mitigates thermal stress on the die and PCB, improves reliability during accidental shorts, and avoids thermal shutdown cycling. Foldback behavior is intrinsic to TLV717285PDQNR's internal design and requires no external configuration.

Can TLV717285PDQNR be used with input voltages below 1.7 V?

No, TLV717285PDQNR has a specified minimum input voltage of 1.7 V per its Recommended Operating Conditions. Operation below this voltage violates the absolute minimum rating and may result in unpredictable behavior, including failure to regulate, erratic enable response, or violation of UVLO thresholds. The 1.6 V UVLO rising threshold ensures startup only above functional input levels, but sustained operation requires VIN ≥1.7 V. For sub-1.7 V inputs, alternative regulators such as the TPS7A02 series should be evaluated. TLV717285PDQNR is not rated or characterized for operation below 1.7 V.