Texas Instruments TLV71318PDBVR

Overview

TLV71318PDBVR from Texas Instruments is a capacitor-free, 150-mA, low-dropout linear regulator with fixed 1.8-V output, 1% accuracy, 230-mV dropout at full load, and active output discharge. It operates from 1.4 V to 5.5 V input and delivers stable power to ultra-low-power microcontrollers and RF modules in space-constrained portable devices.

For engineers reviewing the TLV71318PDBVR datasheet, TLV71318PDBVR pinout, TLV71318PDBVR application, or TLV71318PDBVR equivalent, key selection criteria include its foldback current limit, 50-µA quiescent current, capacitor-free stability, thermal shutdown at 158°C, and compatibility with battery-powered systems requiring fast output discharge on disable.

Technical Context

The TLV71318PDBVR implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its internal foldback current limit reduces thermal stress during overload by lowering output current as voltage collapses - critical for Li-ion battery protection.

Unlike traditional LDOs, it achieves stability without an output capacitor via internal compensation, while remaining compatible with external COUT up to 100 µF. The P-suffix variant integrates a 120-Ω pulldown resistor on the OUT pin for rapid discharge of downstream capacitance upon shutdown.

Key Specifications

Pinout & Package

TLV71318PDBVR uses the 5-pin SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, thermal pad connected to GND. Pin 4 is NC (no internal connection); thermal pad must be soldered to PCB ground plane for optimal thermal performance (R_θJB = 76.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F2EJV50 and MCP1804T-1802I/OT, TLV71318PDBVR uniquely combines capacitor-free stability, active output discharge, and 50-µA IQ in a 1.8-V 150-mA LDO - making it the only option meeting all three requirements for space- and battery-constrained portable electronics.

Availability

TLV71318PDBVR is available at Aetrix Electronics and suitable for wearable health sensors, BLE wireless modules, industrial edge node controllers, and portable diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLV71318PDBVR 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, signal chain, and connectivity solutions.

The TLV713 series was designed specifically for portable, battery-powered applications demanding ultra-low IQ, small solution size, and robust protection - targeting PDAs, handheld audio, PC add-on cards, and modern IoT endpoints.

FAQ

What is the maximum input voltage rating for TLV71318PDBVR?

The absolute maximum input voltage for TLV71318PDBVR is 6 V, but the recommended operating range is 1.4 V to 5.5 V. Exceeding 6 V risks permanent damage per the Absolute Maximum Ratings table. For reliable operation with Li-ion batteries, VIN should remain below 4.35 V during charging cycles to avoid overstress.

Does TLV71318PDBVR require an output capacitor to operate stably?

No, TLV71318PDBVR is explicitly designed for capacitor-free operation and remains stable with zero output capacitance. This eliminates the need for COUT in minimal-footprint designs. However, adding a 1-µF ceramic capacitor improves transient response and reduces output noise - especially beneficial in noise-sensitive analog applications.

How does the foldback current limit function in TLV71318PDBVR during a short circuit?

During a short circuit, TLV71318PDBVR reduces output current from 180 mA (current limit threshold) to approximately 40 mA as VOUT collapses toward 0 V. This foldback behavior lowers power dissipation in the pass device, preventing thermal runaway and allowing safe sustained operation until the fault clears - unlike constant-current limiters that would overheat.

What is the purpose of the NC pin (Pin 4) on TLV71318PDBVR in the SOT-23 package?

Pin 4 on TLV71318PDBVR is designated NC (No Connection) - it has no internal bond wire or circuit connection. Per TI's layout guidelines, this pin may be left floating or connected to GND to improve mechanical stability and thermal conduction, but it must never be used as a signal or power path. Incorrect routing here does not affect functionality.

Can TLV71318PDBVR be used with a 1.2-V enable signal from a microcontroller?

Yes, TLV71318PDBVR's enable threshold is specified as V_EN(HI) ≥ 0.9 V and V_EN(LO) ≤ 0.4 V, making it fully compatible with 1.2-V GPIOs. At 1.2 V, EN is solidly above the turn-on threshold, and the EN pin draws only 0.01 µA - eliminating loading concerns even on weak-drive microcontroller outputs.