Texas Instruments TLV77318PDBVR

Overview

TLV77318PDBVR from Texas Instruments is a 300mA, fixed 1.8V output low-dropout linear regulator in SOT-23-5 package, featuring 80dB PSRR at 217Hz, 180mV dropout at 300mA (1.8V_OUT, DQN), and active output pulldown. It delivers high power-supply rejection and fast load transient response for noise-sensitive analog rails in portable consumer electronics.

For engineers reviewing the TLV77318PDBVR datasheet, TLV77318PDBVR pinout, TLV77318PDBVR application, or TLV77318PDBVR equivalent, key selection criteria include its 1.4V–5.5V input range, ±2% output accuracy over –40°C to +125°C, foldback current limiting, and compatibility with 0.47µF–40µF ceramic output capacitors without external compensation.

Technical Context

The TLV77318PDBVR employs a CMOS pass transistor architecture with internal soft-start and thermal shutdown protection. Its enable-controlled operation supports precise power sequencing, while the active pulldown circuit ensures rapid, controlled discharge of the output node during disable events.

It operates stably with small ceramic capacitors (≥0.47µF C_OUT) and requires no external compensation. The device implements hybrid brick-wall/foldback current limiting-maintaining 350–720mA current limit above VFOLDBACK and scaling down to 65mA short-circuit current near ground-to prevent thermal runaway during fault conditions.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint with exposed pad option; optimized for thermal performance in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F1BHTSA1 and MCP1700T-1802E/TT, the TLV77318PDBVR offers superior PSRR (80dB vs ≤65dB), integrated enable and pulldown, and smaller SOT-23-5 footprint-making it optimal for space- and noise-constrained portable electronics where precise sequencing and fast discharge are mandatory.

Availability

TLV77318PDBVR is available at Aetrix Electronics and suitable for smartphone baseband power, gaming console audio codec supply, and notebook Wi-Fi module core rail applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TLV77318PDBVR 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 and precision analog solutions.

The TLV773 family was designed for portable and battery-powered applications demanding ultra-small size, high PSRR, and low quiescent current-targeting next-generation smartphones, tablets, and wearables where board space and power efficiency are critical.

FAQ

What is the maximum input voltage rating for TLV77318PDBVR?

The absolute maximum input voltage for TLV77318PDBVR is 6.5V, but the recommended operating range is 1.4V to 5.5V. Exceeding 5.5V may cause permanent damage or degrade long-term reliability, even if within absolute maximum ratings. For sustained operation, maintain VIN ≤ 5.5V per TI's Recommended Operating Conditions table.

Does TLV77318PDBVR require an external output capacitor for stability?

Yes, TLV77318PDBVR requires an output capacitor between 0.47µF and 40µF for stability, with X7R or X5R ceramic dielectrics strongly recommended. The device is optimized for low-ESR MLCCs and does not need series resistance; using capacitors outside this range risks oscillation or poor transient response.

What is the purpose of the N/C pin on TLV77318PDBVR?

The N/C (No Connect) pin on TLV77318PDBVR has no internal electrical connection. Texas Instruments recommends connecting it to GND to improve thermal performance by enhancing heat transfer from the die to the PCB ground plane-this reduces junction temperature rise under load without affecting electrical functionality.

How does the active pulldown feature function in TLV77318PDBVR?

The active pulldown in TLV77318PDBVR engages automatically when the EN pin falls below 0.3V, connecting a 135Ω internal resistor between OUT and GND. This rapidly discharges residual charge on the output capacitor, ensuring a known low-voltage state during shutdown-critical for preventing latch-up or undefined logic states in downstream circuits.

Can TLV77318PDBVR operate with a 1.5V input supply?

No-TLV77318PDBVR cannot regulate 1.8V output from a 1.5V input. Its minimum input voltage is 1.4V, but dropout voltage at 300mA is 180mV; thus, minimum functional input is 1.98V (1.8V + 0.18V). At 1.5V input, the device enters dropout mode and output collapses toward the input level, failing to maintain regulation.