Texas Instruments TLV77328PDQNR

Overview

TLV77328PDQNR from Texas Instruments is a 300mA, fixed 2.8V output low-dropout linear regulator in a 1mm × 1mm X2SON-4 (DQN) package. It delivers high PSRR (72dB at 1kHz), 2% output voltage accuracy, and ultra-low dropout of 180mV at 300mA - enabling stable power for noise-sensitive analog and RF circuitry in space-constrained portable electronics.

For engineers reviewing the TLV77328PDQNR datasheet, TLV77328PDQNR pinout, TLV77328PDQNR application, or TLV77328PDQNR equivalent, key selection criteria include its 1.4V–5.5V input range, active output pulldown, foldback current limit, −40°C to +125°C junction temperature rating, and compatibility with 0.47µF–40µF ceramic output capacitors.

Technical Context

The TLV77328PDQNR employs a CMOS pass transistor architecture with internal soft-start and thermal shutdown (160°C trip, 140°C reset). Its enable input (VEN(HI) = 0.9V, VEN(LOW) = 0.3V) supports precise system-level power sequencing, while the active pulldown resistor (135Ω typical) ensures rapid, controlled output discharge during disable.

It operates stably with minimal external components: only a 1µF input capacitor and ≥0.47µF ceramic output capacitor are required. The device's 75 × VOUT µVRMS output noise (10Hz–100kHz) and 55dB PSRR at 1MHz support clean supply rails for ADCs, PLLs, and camera sensor interfaces.

Key Specifications

Pinout & Package

TLV77328PDQNR uses the 1mm × 1mm, 4-pin X2SON (DQN) package with exposed thermal pad. This ultra-compact footprint minimizes PCB area while enabling efficient heat dissipation via connection of the thermal pad to a ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850B2ELVSE and MCP1826T-2802E/DB, TLV77328PDQNR offers the smallest footprint (1mm²), integrated enable and active discharge, and optimal PSRR/noise performance for 2.8V portable electronics - making it the preferred choice where board space, sequencing control, and analog cleanliness are critical.

Availability

TLV77328PDQNR is available at Aetrix Electronics and suitable for smartphone camera modules, gaming console audio subsystems, industrial IoT sensor nodes, automotive infotainment displays, and portable media players requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for TLV77328PDQNR 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 leader specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability electronic components.

The TLV773 family is designed for space-constrained, battery-powered applications demanding high PSRR, low dropout, and robust thermal performance - targeting portable consumer electronics, industrial sensors, and automotive infotainment subsystems.

FAQ

What is the maximum input voltage rating for TLV77328PDQNR?

The absolute maximum input voltage for TLV77328PDQNR is 6.5V, but the recommended operating range is 1.4V to 5.5V. Exceeding 5.5V may trigger internal protection or degrade long-term reliability. Operation within the recommended range ensures full specification compliance, including 2% output accuracy and 180mV dropout at 300mA.

Does TLV77328PDQNR require an external pull-up resistor on the EN pin?

No, TLV77328PDQNR does not require an external pull-up resistor on the EN pin. Its enable input has CMOS-compatible thresholds (VEN(HI) = 0.9V, VEN(LOW) = 0.3V) and low leakage (<1µA), allowing direct connection to microcontroller GPIO pins. Internal biasing ensures defined startup behavior even with floating EN - though tying EN to VIN or a logic signal is recommended for deterministic control.

Can TLV77328PDQNR operate with a 0.47µF output capacitor?

Yes, TLV77328PDQNR is stable with a minimum 0.47µF ceramic output capacitor, as specified in the Recommended Operating Conditions table. This low minimum value enables use of tiny 0201 or 0402 MLCCs, supporting ultra-compact layouts. For improved load transient response, a 1µF–10µF X7R/X5R capacitor is recommended - but 0.47µF meets all stability requirements per TI's characterization.

What is the thermal performance of TLV77328PDQNR in the DQN package?

In the DQN package, TLV77328PDQNR achieves a junction-to-board thermal resistance (RθJB) of 180.8°C/W when the thermal pad is soldered to a 1-in² copper plane with six 12-mil vias. At 300mA and 3.3V input, power dissipation is ~150mW, resulting in ~27°C junction-to-ambient rise above board temperature - well within the −40°C to +125°C operating range when proper layout guidelines are followed.

How does the active pulldown resistor in TLV77328PDQNR function during shutdown?

When TLV77328PDQNR is disabled (VEN < 0.3V), an internal 135Ω MOSFET pulldown connects OUT to GND, actively discharging output capacitance. For a 4.7µF capacitor, this yields a time constant of ~635µs - achieving >99% discharge in under 3ms. This prevents residual voltage from holding downstream logic in indeterminate states and eliminates pop/click in audio paths during power-down sequences.