Texas Instruments TLV743285PDQNR

Overview

TLV743285PDQNR from Texas Instruments is a 300-mA, ultra-low-quiescent-current low-dropout (LDO) regulator in a 4-pin X2SON package, delivering fixed 2.85 V output with 1.4% maximum accuracy, 125 mV dropout at 300 mA (3.3 V version), and active output discharge - designed for power rail regulation in space-constrained portable electronics.

For engineers reviewing the TLV743285PDQNR datasheet, TLV743285PDQNR pinout, TLV743285PDQNR application, or TLV743285PDQNR equivalent, key selection criteria include its 34 µA quiescent current, 1-µF ceramic capacitor stability, foldback overcurrent protection, and thermal shutdown behavior across –40°C to +125°C junction temperature range.

Technical Context

The TLV743285PDQNR uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-voltage blocking via its body diode. Its UVLO circuit (1.25 V falling / 1.3 V rising) prevents erratic startup below valid input range, while the active pulldown resistor (120 Ω) ensures rapid output discharge during disable.

It implements foldback current limiting - reducing output current as VOUT collapses - and thermal shutdown (160°C trip, 140°C reset) to protect against sustained overload. The device operates stably with only 1 µF output capacitance and achieves 50 dB PSRR at 1 kHz under 300 mA load.

Key Specifications

Pinout & Package

TLV743285PDQNR is housed in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with exposed thermal pad electrically tied to GND. This ultra-compact footprint targets high-density PCB layouts in smartphones and compact modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F28TAV50 and AP7361D-2850G-7, TLV743285PDQNR delivers superior efficiency (34 µA IQ), faster transient response (1-µF stability), and safer fault behavior (foldback + active discharge), making it optimal for portable and space-constrained designs where thermal and sequencing integrity are prioritized over automotive qualification or lowest unit cost.

Availability

TLV743285PDQNR is available at Aetrix Electronics and suitable for smartphone power management, wearable health sensor hubs, automotive infotainment displays, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.

Supply support for TLV743285PDQNR 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 high-reliability signal chain solutions.

The TLV743P series was developed to address ultra-low-power, space-constrained applications in portable consumer electronics - emphasizing minimal quiescent current, small-footprint packaging, and robust protection features without sacrificing regulation accuracy.

FAQ

What is the output voltage tolerance of TLV743285PDQNR over temperature and load?

The TLV743285PDQNR maintains ±1.4% output voltage accuracy across the full operating junction temperature range (–40°C to +125°C) and output load current (0 to 300 mA). This specification is verified per TI's SBVS310C datasheet Section 6.5, ensuring predictable performance in thermally dynamic environments such as handheld devices and automotive cabins. The 2.85 V nominal output remains within 2.811 V to 2.889 V under worst-case conditions.

Does TLV743285PDQNR require an external pull-up resistor on the EN pin?

No, TLV743285PDQNR does not include an internal pull-up or pull-down on the EN pin. An external pull-up to VIN or a controlled GPIO is required to ensure reliable startup and shutdown sequencing. The EN pin thresholds are V_EN(HI) = 0.9 V (enable) and V_EN(LO) = 0.35 V (disable), making it compatible with 1.8 V logic without level shifters. Leaving EN floating may cause unpredictable operation.

Can TLV743285PDQNR operate with input voltage lower than 2.85 V?

Yes - TLV743285PDQNR supports input voltages as low as 1.4 V, but regulation is only maintained when VIN exceeds VOUT + VDO. At 300 mA load, dropout is 270 mV for 2.5–3.3 V outputs; thus, minimum functional VIN is ~3.12 V for 2.85 V output. Below that, the device enters dropout mode (VOUT ≈ VIN – VDO) or disables entirely if VIN falls below UVLO (1.25 V falling threshold).

What is the purpose of the thermal pad on TLV743285PDQNR's X2SON package?

The exposed thermal pad on TLV743285PDQNR is electrically connected to GND and must be soldered to a PCB ground plane to achieve specified thermal performance. It reduces junction-to-board thermal resistance to 164.9°C/W, enabling safe 300 mA operation at elevated ambient temperatures. Omitting thermal pad connection risks exceeding 125°C max junction temperature under sustained load, triggering thermal shutdown.

How does the foldback current limit behave during a short-circuit event on TLV743285PDQNR?

During output short-circuit, TLV743285PDQNR reduces current to ~170 mA (at 3.3 V output) - significantly lower than its 300 mA rated output - to limit power dissipation and delay thermal shutdown. Unlike constant-current limiting, foldback further decreases current as VOUT collapses, protecting the PMOS pass transistor. Recovery occurs after thermal shutdown resets at ~140°C, provided the fault is removed.