Texas Instruments TLV71730PDQNT

Overview

TLV71730PDQNT from Texas Instruments is a 150-mA, low-dropout linear regulator with 3.0-V fixed output, 215-mV dropout at full load, 0.5% typical output accuracy, 35-µA quiescent current, and foldback current limiting. It delivers stable regulation for battery-powered portable electronics requiring ultra-low power consumption and compact footprint.

For engineers reviewing the TLV71730PDQNT datasheet, TLV71730PDQNT pinout, TLV71730PDQNT application, or TLV71730PDQNT equivalent, key selection criteria include dropout voltage under 150 mA load, active pulldown capability for fast output discharge, stability with ≥0.1 µF ceramic output capacitance, PSRR of 65 dB at 1 kHz, and operation across –40°C to +85°C junction temperature.

Technical Context

The TLV71730PDQNT employs a PMOS pass transistor architecture enabling very low dropout and inherent reverse-voltage protection via its body diode. Its foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing power dissipation during fault conditions.

It integrates undervoltage lockout (UVLO = 1.6 V), active-high enable logic with 0.9-V turn-on threshold, and an internal 120-Ω pulldown resistor for rapid output discharge during shutdown - all operating within a 1-mm × 1-mm X2SON (DQN) package optimized for space-constrained handheld designs.

Key Specifications

Pinout & Package

Package: X2SON (DQN), 4-pin, 1.00 mm × 1.00 mm body size, thermal pad on bottom connected to GND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC71730PDQNT, TLV71730PDQNT offers 20-µA lower IQ and integrated pulldown; compared with MCP1700T-3002E/MB, it provides 385-mV lower dropout and foldback protection - critical for compact, battery-fed systems with variable input and fault resilience requirements.

Availability

TLV71730PDQNT is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor nodes, industrial handheld terminals, and POS payment modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLV71730PDQNT 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 TLV717P series was designed specifically for portable, battery-powered applications demanding ultra-low quiescent current, minimal board area, and robust fault protection - targeting smartphones, wearables, and handheld industrial devices.

FAQ

What is the minimum input voltage required for TLV71730PDQNT to maintain regulation at 3.0 V output?

The TLV71730PDQNT requires a minimum input voltage of 3.215 V to maintain regulation at full 150-mA load, based on its 215-mV dropout specification. At lighter loads, dropout decreases - e.g., ~100 mV at 50 mA - allowing operation down to ~3.1 V. Input must also exceed the 1.6-V UVLO threshold for initial startup.

Does TLV71730PDQNT support reverse-voltage protection, and how is it implemented?

Yes, TLV71730PDQNT provides inherent reverse-voltage protection via the body diode of its internal PMOS pass transistor. When VOUT exceeds VIN, the body diode remains reverse-biased, blocking current flow from output to input. However, extended reverse-voltage operation (>5% of rated output current) is not recommended without external limiting per TI guidance.

How does the foldback current limit in TLV71730PDQNT improve system reliability compared to a fixed current limit?

The foldback current limit in TLV71730PDQNT reduces output current as VOUT collapses during overload, lowering power dissipation in the pass transistor. For example, at a short circuit, it limits current to 40 mA instead of sustaining 150 mA - cutting worst-case power loss from 450 mW to just 12 mW and preventing thermal runaway in confined PCB layouts.

Can TLV71730PDQNT operate without an input capacitor, and what are the trade-offs?

While TLV71730PDQNT is stable without an input capacitor, TI recommends a 0.1–1 µF low-ESR ceramic capacitor between IN and GND. Omitting it risks degraded transient response, increased ripple susceptibility, and potential instability if source impedance exceeds 2 Ω - especially during fast load steps or when the LDO is remote from its power source.

What is the purpose and behavior of the active pulldown resistor in TLV71730PDQNT during shutdown?

The active pulldown resistor (120 Ω typical) in TLV71730PDQNT engages automatically when EN is pulled low (<0.4 V), rapidly discharging the output capacitor and any attached load capacitance. This prevents floating voltages, avoids unintended wake-up of downstream logic, and ensures predictable reset sequencing - critical in systems with multiple power domains.