Texas Instruments TLV75509PDRVR

Overview

TLV75509PDRVR from Texas Instruments is a 500mA, low-quiescent-current (25μA typical), fixed 0.9V output low-dropout regulator in a 5-pin SOT-23-5 (DBV) package. It operates from 1.45V to 5.5V input, delivers ±1% output accuracy at 85°C, and features active output discharge, foldback current limiting, and stable operation with only 1µF ceramic output capacitance - ideal for powering ultra-low-voltage microcontroller cores in space-constrained portable electronics.

For engineers reviewing the TLV75509PDRVR datasheet, TLV75509PDRVR pinout, TLV75509PDRVR application, or TLV75509PDRVR equivalent, key selection criteria include its 238mV max dropout at 500mA (3.3VOUT), 46dB PSRR at 100kHz, thermal shutdown (165°C), and enable-controlled startup with monotonic VOUT rise - all validated for use in battery-powered IoT sensors and wearable MCU subsystems.

Technical Context

The TLV75509PDRVR employs a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 1kHz–1MHz. Its internal bandgap reference and error amplifier deliver 1% output accuracy over –40°C to +85°C, while the integrated soft-start circuit limits inrush current during power-up.

Functional safety features include undervoltage lockout (UVLO rising threshold 1.21–1.44V), foldback current limit (720mA typ at 3.3VOUT), and active pulldown (120Ω) on shutdown. The device enters thermal shutdown at 165°C and resets at 155°C, with junction temperature rated up to 125°C for continuous operation.

Key Specifications

Pinout & Package

TLV75509PDRVR uses the 5-pin SOT-23-5 (DBV) package: 2.9mm × 2.8mm body, 0.95mm height, gull-wing leads, JEDEC MO-178AC compliant. Thermal resistance R_θJA = 100.8°C/W (JEDEC standard PCB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESA1 and TPS7A0509PDBVR, TLV75509PDRVR uniquely balances 500mA capability, 0.9V output, 25μA IQ, and 1.45V minimum input - making it the only option among the three for high-efficiency, single-cell-powered 0.9V core regulation in consumer and medical edge devices.

Availability

TLV75509PDRVR is available at Aetrix Electronics and suitable for wearable sensor nodes, portable medical diagnostics, and ultra-low-power remote controls requiring stable component supply across long production lifecycles.

Supply support for TLV75509PDRVR 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 market presence.

The TLV755P series was engineered to address shrinking PCB real estate and battery life demands in portable electronics - delivering high-current, ultra-low-IQ, fixed-output LDOs in sub-3mm packages with minimal external components.

FAQ

What is the maximum input voltage rating for TLV75509PDRVR?

The absolute maximum input voltage for TLV75509PDRVR is 6.0V, but the recommended operating range is 1.45V to 5.5V. Exceeding 5.5V may trigger undervoltage lockout or cause reliability degradation; operation above 6.0V risks permanent damage per the datasheet's Absolute Maximum Ratings table. Always maintain VIN within 1.45V–5.5V for guaranteed performance and lifetime compliance.

Does TLV75509PDRVR require an input capacitor, and if so, what value?

Yes, TLV75509PDRVR requires a minimum 1µF ceramic capacitor between IN and GND. This capacitor stabilizes the input rail during load transients and reduces noise coupling into the regulator. X5R or X7R dielectrics are recommended for minimal capacitance shift over temperature and DC bias. Larger values (up to 10µF) improve line transient response but are not required for basic stability.

Can TLV75509PDRVR be used with output capacitance less than 1µF?

No - TLV75509PDRVR is only guaranteed stable with ≥1µF ceramic output capacitance. The datasheet specifies a minimum effective COUT of 0.47µF (with 50% derating), meaning a nominal 1µF capacitor is required to ensure ≥0.5µF effective capacitance under bias and temperature. Using smaller values risks oscillation, poor transient response, or failure to regulate.

What is the purpose of the NC pin on TLV75509PDRVR (DBV package)?

Pin 4 on TLV75509PDRVR's SOT-23-5 (DBV) package is designated NC (No Connection) - it has no internal bond wire or circuit connection. It must be left unconnected or tied to GND for mechanical stability; routing a signal or voltage to this pin provides no function and may compromise package integrity. This pin exists solely for package symmetry and manufacturability.

How does the active output discharge feature work in TLV75509PDRVR?

When TLV75509PDRVR is disabled via the EN pin, an internal 120Ω switch connects OUT to GND, actively discharging the output capacitor. This ensures rapid, predictable VOUT collapse - critical for avoiding undefined logic states in downstream digital ICs during power sequencing. Discharge time depends on COUT and parallel load resistance, per τ = (120·R_L)/(120+R_L)·C_OUT.