Texas Instruments TLV71325PDBVR

Overview

TLV71325PDBVR from Texas Instruments is a capacitor-free, 150-mA, low-dropout linear regulator with active output discharge, fixed 2.5-V output, 1% accuracy at 25°C, 230 mV dropout at 150 mA, and 50 µA quiescent current-designed for power-sensitive portable devices such as handheld audio players and WLAN add-on cards.

For engineers reviewing the TLV71325PDBVR datasheet, TLV71325PDBVR pinout, TLV71325PDBVR application, or TLV71325PDBVR equivalent, key selection criteria include foldback current limiting, capacitor-free stability, active pulldown capability, input voltage range (1.4 V to 5.5 V), and thermal performance in the 1-mm × 1-mm X2SON package.

Technical Context

The TLV71325PDBVR implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent capacitor-free stability across load and temperature. Its internal foldback current limit reduces output current during overloads to minimize power dissipation and thermal stress.

It integrates an enable-controlled startup sequence with inrush current control and features an active pulldown circuit (enabled only in 'P' variants) that discharges the output via a 120-Ω internal resistor when disabled-critical for systems requiring fast, controlled power-down sequencing.

Key Specifications

Pinout & Package

TLV71325PDBVR is housed in a 4-pin, 1.0 mm × 1.0 mm X2SON package with exposed thermal pad electrically tied to GND. The compact footprint minimizes PCB area while enabling efficient heat transfer to the ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850C2TE/V33 and MCP1700T-2502E/MB, TLV71325PDBVR uniquely balances capacitor-free operation, active discharge, foldback protection, and ultra-small X2SON packaging-making it optimal for consumer portables where size, safety, and dynamic load behavior are critical.

Availability

TLV71325PDBVR is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE audio dongles, industrial sensor nodes, and smart home motion detectors requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TLV71325PDBVR 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, signal chain solutions, and high-reliability components.

The TLV713 series was designed specifically for portable, battery-powered devices demanding ultra-low IQ, capacitor-free simplicity, and robust fault handling-targeting PDAs, handheld audio, and PC add-on cards where board space and power efficiency are constrained.

FAQ

Does TLV71325PDBVR require an output capacitor to operate stably?

No, TLV71325PDBVR is explicitly designed for capacitor-free operation and remains stable with zero external output capacitance. This eliminates BOM cost and PCB area for C_OUT. However, adding a 1-µF ceramic capacitor improves load transient response and is recommended for systems with rapidly varying current demands. The TLV71325PDBVR datasheet confirms stability across all conditions without C_OUT.

What is the purpose of the active pulldown feature in TLV71325PDBVR?

The active pulldown feature in TLV71325PDBVR engages a 120-Ω internal resistor between OUT and GND when the EN pin is driven low, rapidly discharging the output node. This prevents floating voltages or unintended biasing of downstream circuitry during power-down sequences. It is exclusive to 'P' variants like TLV71325PDBVR and is confirmed in the Electrical Characteristics table under RPULLDOWN parameter.

How does the foldback current limit function in TLV71325PDBVR during a short circuit?

In TLV71325PDBVR, the foldback current limit reduces output current from 150 mA to approximately 40 mA under short-circuit conditions (V_OUT ≈ 0 V). This nonlinear reduction lowers power dissipation in the pass element, preventing thermal shutdown and enabling safe, self-limiting fault operation. The behavior is documented in Figure 16 and Table 6.5 (ISC = 40 mA) of the TLV71325PDBVR datasheet.

Can TLV71325PDBVR be used with a 1.8-V input supply?

Yes, TLV71325PDBVR supports input voltages as low as 1.4 V, making it fully compatible with a 1.8-V source. However, with V_IN = 1.8 V and V_OUT = 2.5 V, regulation is impossible-the device requires V_IN ≥ V_OUT + V_DO. At 150 mA, V_DO = 230 mV, so minimum valid V_IN is 2.73 V. Therefore, TLV71325PDBVR cannot regulate from 1.8 V, but functions correctly from ≥2.73 V inputs such as single-cell Li-ion (3.0–4.2 V).

What is the thermal performance of TLV71325PDBVR in its X2SON package?

TLV71325PDBVR in the 4-pin X2SON package has a junction-to-board thermal resistance (R_θJB) of 208.2°C/W when the thermal pad is soldered to a 1-in² copper pour. Its maximum junction temperature is 125°C, and thermal shutdown activates at 158°C. These values are specified in Section 6.4 (Thermal Information) of the TLV71325PDBVR datasheet and assume proper PCB layout per TI's layout guidelines in Section 10.