Texas Instruments TLV73311PDQNT

Overview

TLV73311PDQNT from Texas Instruments is a capacitor-free, 300-mA, low-dropout linear regulator (LDO) in a 1.0-mm × 1.0-mm X2SON-4 package, delivering 1.1 V output with 125 mV dropout at 300 mA, ±1.4% output accuracy, and 34 µA quiescent current. It serves as a primary power rail regulator for ultra-compact battery-powered systems requiring fast startup and active output discharge.

For engineers reviewing the TLV73311PDQNT datasheet, TLV73311PDQNT pinout, TLV73311PDQNT application, or TLV73311PDQNT equivalent, key selection criteria include capacitor-free stability, thermal shutdown behavior at 160°C, EN pin thresholds (VEN(HI) = 0.9 V, VEN(LO) = 0.35 V), and foldback current limiting during short-circuit events.

Technical Context

The TLV73311PDQNT uses a PMOS pass transistor architecture enabling true capacitor-free operation-stable with zero input or output capacitance-while maintaining load transient response via internal compensation. Its undervoltage lockout (UVLO) engages below 1.25 V (falling) and releases above 1.3 V (rising), preventing erratic startup under weak supply conditions.

Functional modes include normal regulation, dropout operation (where VOUT = VIN – VDO), and disabled state with active 120-Ω pull-down on OUT. Shutdown current is ≤1 µA at 25°C, and thermal shutdown activates at ~160°C with hysteresis reset at ~140°C.

Key Specifications

Pinout & Package

TLV73311PDQNT is housed in a 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with an exposed thermal pad electrically connected to GND. The compact footprint supports high-density PCB layouts in space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73311PDQNT, TLV73311PDBVR trades miniaturization for legacy package compatibility, while TPS7A05115PDQNR prioritizes quiescent current over dropout and capacitor freedom-making TLV73311PDQNT optimal for space- and efficiency-critical 1.1-V rail generation.

Availability

TLV73311PDQNT is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hub supply, industrial IoT edge node power, USB-C peripheral power, and compact medical device rails requiring stable component supply and full lifecycle support.

Supply support for TLV73311PDQNT 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 for portable and industrial applications.

The TLV733 series was designed specifically for ultra-small, capacitor-free LDO regulation in battery-powered consumer electronics-emphasizing minimal footprint, low IQ, and robust fault protection without external components.

FAQ

What is the minimum input voltage required for TLV73311PDQNT to regulate 1.1 V?

The TLV73311PDQNT requires a minimum input voltage of 1.4 V per recommended operating conditions. However, due to its 125 mV dropout at 300 mA, it can maintain regulation down to VIN = 1.225 V in practice-but below 1.4 V, undervoltage lockout (UVLO) disables the output. The UVLO falling threshold is 1.25 V, so sustained operation below that voltage is not functional. TLV73311PDQNT thus supports single-cell lithium systems down to ~2.7 V nominal, but not sub-1.4 V inputs.

Does TLV73311PDQNT require input or output capacitors for stability?

No, TLV73311PDQNT is explicitly designed for capacitor-free operation-stable with zero input or output capacitance. This eliminates inrush current at startup and reduces BOM count and PCB area. However, it remains stable if a ceramic output capacitor (e.g., 1 µF) is added for improved transient response or noise filtering. Input capacitance is optional but recommended for high-impedance sources.

How does the active output discharge function work in TLV73311PDQNT?

When TLV73311PDQNT is disabled via the EN pin, an internal 120-Ω pulldown resistor connects the OUT pin to GND. This actively discharges downstream capacitance-e.g., a 1-µF load discharges to <10% of VOUT in approximately 1.2 ms. The discharge time constant depends on COUT and parallel load resistance (τ ≈ 120 Ω × COUT). This feature ensures rapid rail collapse for safe power sequencing and prevents floating nodes in multi-rail systems.

What is the thermal shutdown behavior of TLV73311PDQNT?

TLV73311PDQNT triggers thermal shutdown at ~160°C junction temperature and resets at ~140°C, providing 20°C hysteresis. During shutdown, the output is disabled and the 120-Ω pull-down remains active. If the fault persists, the device cycles between shutdown and regulation-a condition indicating excessive power dissipation. For reliable operation, design must limit TJ to ≤125°C using the DQN package's RθJB = 164.9°C/W and adequate PCB copper area.

Can TLV73311PDQNT be used with a 1.2-V logic GPIO to control EN?

Yes. TLV73311PDQNT's EN pin has VEN(HI) = 0.9 V (min) and VEN(LO) = 0.35 V (max), making it fully compatible with 1.2-V CMOS GPIOs. A 1.2-V high signal exceeds the 0.9-V enable threshold with 300 mV margin, while a 0-V low signal falls well below the 0.35-V disable threshold. No level shifter is needed, and the EN pin draws only 0.01 µA, minimizing GPIO loading.