Texas Instruments TLV75509PDQNR

Overview

TLV75509PDQNR from Texas Instruments is a 500mA, low-quiescent-current (25μA typical), fixed 0.9V output LDO regulator in a 1mm × 1mm X2SON-4 package. It operates from 1.45V to 5.5V input, delivers ±1.2% output accuracy over –40°C to +85°C, and maintains regulation with only a 1µF ceramic output capacitor. It serves as a core voltage supply for ultra-low-power microcontrollers in space-constrained portable electronics.

For engineers reviewing the TLV75509PDQNR datasheet, TLV75509PDQNR pinout, TLV75509PDQNR application, or TLV75509PDQNR equivalent, key selection criteria include its 238mV max dropout at 500mA (3.3VOUT), active output discharge, foldback current limit, 46dB PSRR at 100kHz, and thermal shutdown with 165°C trip point - all critical for battery-powered system stability and startup reliability.

Technical Context

The TLV75509PDQNR implements a PMOS pass transistor architecture with precision band-gap reference and error amplifier, enabling 1% typical output accuracy and low line/load regulation (≤2mV line reg, ≤0.036V/A load reg for DQN package). Its internal soft-start ensures monotonic VOUT rise and limits inrush current during power-up.

Functional safety features include undervoltage lockout (1.21–1.44V rising threshold), active pulldown (120Ω) during shutdown, foldback current limiting (720mA typ short-circuit current), and thermal shutdown (165°C trip, 155°C reset). These are integrated without external components, supporting robust operation across –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

TLV75509PDQNR uses the 1mm × 1mm X2SON-4 (DQN) package with wettable flank leads for automated optical inspection. Thermal pad is internally connected to GND and must be soldered to a PCB ground plane for optimal thermal performance (R_θJA = 168.4°C/W per JEDEC standard).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGQ and TPS7A0509PDBVR, TLV75509PDQNR uniquely combines 500mA capability, 0.9V fixed output, active discharge, and 238mV dropout in X2SON-4 - making it the only direct fit for space-constrained, high-burst-current 0.9V MCU applications.

Availability

TLV75509PDQNR is available at Aetrix Electronics and suitable for wearable health sensors, ultra-low-power MCU subsystems, smart home motion detectors, and industrial wireless sensor nodes requiring stable component supply across long production lifecycles.

Supply support for TLV75509PDQNR 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 and embedded processing technologies, with decades of LDO design expertise and broad automotive, industrial, and personal electronics qualification.

The TLV755P family was engineered for ultra-small, battery-sensitive applications demanding high efficiency, low noise, and guaranteed stability with minimal external components - targeting next-generation wearables, IoT endpoints, and portable medical devices.

FAQ

What is the maximum input voltage rating for TLV75509PDQNR?

The absolute maximum input voltage for TLV75509PDQNR is 6.0V. However, the recommended operating range is 1.45V to 5.5V. Exceeding 6.0V risks permanent damage per the Absolute Maximum Ratings table. For reliable operation, keep VIN ≤ 5.5V and ensure transient spikes remain within the 6.0V limit using appropriate input filtering.

Does TLV75509PDQNR require an input capacitor, and what value is recommended?

Yes, TLV75509PDQNR requires a minimum 1µF ceramic input capacitor connected between IN and GND. This capacitor stabilizes the input rail, reduces high-frequency noise, and supports transient response during load steps. X5R or X7R dielectrics are recommended for stable capacitance across temperature and DC bias.

How does the active output discharge function in TLV75509PDQNR during shutdown?

When TLV75509PDQNR is disabled via the EN pin, an internal 120Ω switch actively pulls the OUT pin to GND. This discharges the output capacitor quickly, ensuring a defined low-voltage state before the next power-up cycle. Discharge time depends on C_OUT and parallel load resistance, per τ = (120·R_L)/(120 + R_L)·C_OUT.

Can TLV75509PDQNR operate with a 0.47µF output capacitor?

No - TLV75509PDQNR requires a minimum of 1µF ceramic output capacitor for guaranteed stability across all operating conditions. While the datasheet notes 0.47µF as the *effective* minimum after derating, the nominal capacitor must be ≥1µF (X5R/X7R) to ensure >0.47µF effective capacitance under DC bias and temperature extremes.

What is the thermal resistance (R_θJA) of TLV75509PDQNR in its X2SON-4 package?

The JEDEC-standard R_θJA for TLV75509PDQNR in the DQN (X2SON-4) package is 168.4°C/W. This value assumes a 2-layer PCB with no thermal vias. Real-world performance improves significantly with proper thermal pad soldering to a large internal or external GND plane - enabling reliable 500mA operation up to +70°C ambient.