Texas Instruments TLV75729PDBVR

Overview

TLV75729PDBVR from Texas Instruments is a 1A, low-quiescent-current (25μA typical), fixed 2.9V output LDO regulator in SOT-23-5 (DBV) package. It operates from 1.45V to 5.5V input, delivers ±1% output accuracy, supports stable regulation with only 1µF ceramic output capacitor, and features built-in soft-start, active output discharge, and foldback current limit - ideal for powering MCU core rails in space-constrained portable electronics.

For engineers reviewing the TLV75729PDBVR datasheet, TLV75729PDBVR pinout, TLV75729PDBVR application, or TLV75729PDBVR equivalent, key selection considerations include dropout voltage at 1A (max 425mV @ 3.3VOUT, scaled per VOUT), thermal resistance (RθJA = 100.8°C/W for DBV), EN pin logic thresholds (VHI = 1V, VLO = 0.3V), and compatibility with low-ESR ceramic capacitors down to 0.47µF.

Technical Context

The TLV75729PDBVR uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (46dB @ 100kHz). Its internal bandgap reference and error amplifier deliver 1% output accuracy across –40°C to +125°C, while integrated UVLO (1.21–1.44V) and thermal shutdown (165°C trip) ensure robust operation under brownout and overload conditions.

Functional modes include normal regulation (VIN ≥ VOUT + VDO), dropout (VIN < VOUT + VDO, output tracks input), and disabled state (EN < VLO, active pulldown via 120Ω switch). The enable pin is independent of VIN but requires sequencing care when driven above VIN to avoid excess EN current.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint, no thermal pad, standard lead pitch. Suitable for high-density PCB layouts with minimal thermal relief area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGQDR and TPS7A0529PDQNR, TLV75729PDBVR uniquely combines 1A output, 2.9V fixed regulation, 25μA IQ, and SOT-23-5 packaging - making it the only direct fit for space-constrained, high-current 2.9V MCU core supplies requiring soft-start and active discharge.

Availability

TLV75729PDBVR is available at Aetrix Electronics and suitable for portable MCU power, USB-powered peripherals, industrial sensor nodes, and white goods control boards requiring stable component supply and long-term manufacturability.

Supply support for TLV75729PDBVR 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 solutions, with leadership in power management ICs and precision analog components.

The TLV757P family was designed for ultra-small, low-IQ, high-performance LDO applications in battery-powered and space-constrained systems - emphasizing minimal solution size, wide VIN range, and robust protection features.

FAQ

What is the maximum dropout voltage specification for TLV75729PDBVR at 1A load?

The TLV75729PDBVR has a maximum dropout voltage of 425mV at 1A load for 3.3V output. For its fixed 2.9V output, the datasheet specifies ≤375mV at 1A over –40°C to +85°C (based on interpolation from the 2.5V–3.3V bin and DYD/DBV package data). This ensures regulation remains stable down to VIN = 3.275V under worst-case conditions. The actual dropout is lower at room temperature and light loads.

Does TLV75729PDBVR require an input capacitor, and what value is recommended?

Yes, TLV75729PDBVR requires an input capacitor of ≥1µF ceramic (X5R/X7R) placed between IN and GND. This capacitor stabilizes the input rail during load transients and reduces high-frequency noise coupling. The datasheet specifies 1µF as the minimum nominal value, with derating accounted for - effective capacitance must remain ≥0.47µF at operating voltage and temperature. Larger values (up to 10µF) improve transient response but are not required for stability.

Can TLV75729PDBVR be used with output capacitance smaller than 1µF?

Yes - TLV75729PDBVR is stable with output capacitance as low as 0.47µF (nominal), provided it is an X5R or X7R ceramic type. The datasheet explicitly states "Make sure the nominal input and output capacitance are greater than 0.47µF" and confirms stability down to this value with 50% derating. However, 1µF is recommended for optimal transient performance and margin; using 0.47µF may reduce load-step immunity slightly.

How does the enable pin (EN) behave when driven above the input voltage (VIN) in TLV75729PDBVR?

When EN is driven above VIN in TLV75729PDBVR, the enable pin current increases significantly - reaching up to 10nA at VIN = 5.5V and EN = 5.5V, but rising further if EN exceeds VIN. This is due to internal ESD diode conduction. To avoid unintended current paths or timing skew, TI recommends either tying EN to VIN directly or sequencing EN after VIN reaches regulation. If independent control is needed, limit EN toggle frequency to <10kHz when EN > VIN.

What protection features are integrated into TLV75729PDBVR?

TLV75729PDBVR integrates undervoltage lockout (UVLO: 1.21–1.44V), thermal shutdown (trip at 165°C, reset at 155°C), foldback current limiting, and active output discharge. UVLO prevents erratic behavior during brownout; thermal shutdown safeguards against sustained overload; foldback current limit reduces power dissipation during shorts; and the 120Ω active pulldown ensures rapid, controlled discharge of the output node upon disable - eliminating residual voltage that could interfere with downstream logic states.