Texas Instruments TLV75718PDYDR

Overview

TLV75718PDYDR from Texas Instruments is a 1A, low-quiescent-current (25μA typical), fixed 1.8V output LDO regulator in a thermally enhanced SOT-23-5 (DYD) package with exposed thermal pad. It operates from 1.45V to 5.5V input, delivers ≤1% output accuracy, and maintains regulation with only a 1µF ceramic output capacitor - enabling compact power delivery for MCU core rails and portable electronics.

For engineers reviewing the TLV75718PDYDR datasheet, TLV75718PDYDR pinout, TLV75718PDYDR application, or TLV75718PDYDR equivalent, key selection criteria include its 425mV max dropout at 1A (for 3.3VOUT), active output discharge, foldback current limit, and 60.3°C/W R_θJA thermal resistance - all critical for battery-powered systems requiring fast startup, low standby power, and robust fault handling.

Technical Context

The TLV75718PDYDR employs a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (46dB at 100kHz). Its internal soft-start ensures monotonic V_OUT rise and limits inrush current, while undervoltage lockout (UVLO) disables operation below 1.21V (rising) to prevent erratic behavior during brownout.

Functional modes include normal regulation (VIN ≥ V_OUT + V_DO, EN > V_HI), dropout (VIN < V_OUT + V_DO), and disabled state (EN < V_LO), with active pulldown (120Ω) discharging the output during shutdown - ensuring known power-up states in multi-rail systems.

Key Specifications

Pinout & Package

TLV75718PDYDR uses a 5-pin SOT-23-5 package (DYD) with 2.9mm × 1.6mm footprint and an exposed thermal pad internally connected to GND. The pad must be soldered to a large-area ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK, TLV75718PDYDR offers 1A output and lower dropout for higher efficiency in space-constrained designs, but lacks automotive qualification. Against MCP1703T-1802E/MB, it provides 6.7× higher current, enable control, and active discharge - essential for modern processors yet retains comparable PCB footprint via the DYD package.

Availability

TLV75718PDYDR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive camera modules, and smart home hub processors requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV75718PDYDR 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TLV757P family was engineered for ultra-small, low-I_Q power management in battery-powered and space-constrained electronics - emphasizing minimal solution size, fast transient response, and robust protection for modern microcontroller and sensor subsystems.

FAQ

What is the maximum input voltage rating for TLV75718PDYDR?

The absolute maximum input voltage for TLV75718PDYDR is 6.0V. However, the recommended operating range is 1.45V to 5.5V. Exceeding 5.5V may cause permanent damage or degrade reliability, even if within the absolute maximum rating. Always ensure VIN remains ≤5.5V in normal operation, especially when sourced from unregulated supplies like batteries or rectified AC.

Does TLV75718PDYDR require an external pull-up resistor on the EN pin?

No, TLV75718PDYDR does not require an external pull-up on EN. It has no internal pull-up; however, the EN pin is compatible with direct connection to VIN for always-on operation. If controlled by a microcontroller GPIO, ensure the driver can source ≥1V (V_HI) and sink <0.3V (V_LO). An external pull-down is unnecessary - the device draws only 10nA at EN when VIN = 5.5V.

Can TLV75718PDYDR operate stably with a 0.68µF output capacitor?

No. TLV75718PDYDR requires a minimum effective output capacitance of 0.47µF, but the datasheet specifies ≥1µF nominal value to account for 50% DC-bias derating of ceramic capacitors. A 0.68µF capacitor - even if rated - will likely fall below 0.47µF under 1.8V bias, risking instability, overshoot, or oscillation. Always use ≥1µF X5R/X7R ceramic with appropriate voltage rating (e.g., 6.3V).

What is the thermal pad connection requirement for TLV75718PDYDR?

The exposed thermal pad on TLV75718PDYDR is internally connected to GND and must be soldered to a dedicated, low-impedance ground plane using ≥4 thermal vias (0.3mm diameter) spaced evenly beneath the pad. Failure to connect the pad degrades R_θJA from 60.3°C/W to >92°C/W, limiting usable output current to ~400mA at 85°C ambient - compromising full 1A capability and reliability.

How does the foldback current limit behave during a short-circuit event on TLV75718PDYDR?

During a short circuit, TLV75718PDYDR initially delivers ~755mA (ISC), then folds back current as V_OUT drops below 0.4×1.8V = 0.72V. At 0V output, current reduces to ~300mA - lowering power dissipation [(VIN – 0V) × 300mA] and delaying thermal shutdown. This enables brief fault tolerance and safer auto-recovery once the short is removed, unlike brick-wall limiters that sustain full 1A indefinitely.