Texas Instruments TLV71736PDQNR

Overview

TLV71736PDQNR from Texas Instruments is a 150-mA, low-dropout linear regulator with active pulldown, foldback current limit, and 0.5% output accuracy. It delivers 3.6 V fixed output at up to 150 mA with 215 mV dropout (at 150 mA), 35 µA quiescent current, and stable operation using only 0.1 µF ceramic output capacitance. It targets power-sensitive portable electronics requiring fast discharge and high PSRR.

For engineers reviewing the TLV71736PDQNR datasheet, TLV71736PDQNR pinout, TLV71736PDQNR application, or TLV71736PDQNR equivalent, key selection criteria include dropout voltage at full load, enable threshold compatibility with low-voltage GPIOs, short-circuit foldback behavior, thermal performance in 1-mm × 1-mm X2SON, and stability with bias-derated capacitors in space-constrained designs.

Technical Context

The TLV71736PDQNR uses a PMOS pass transistor enabling ultra-low dropout and inherent reverse-current blocking via its integrated body diode. Its foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing power dissipation during faults. The device incorporates undervoltage lockout (UVLO = 1.6 V) and an active pulldown resistor (120 Ω) for rapid output discharge upon disable.

It operates across –40°C to +85°C junction temperature, supports input voltages from 1.7 V to 5.5 V, and maintains regulation with zero load. Its 70 dB PSRR at 1 kHz and 55 µV_RMS output noise (100 Hz–100 kHz) make it suitable for noise-sensitive RF and analog supply rails where headroom is limited.

Key Specifications

Pinout & Package

TLV71736PDQNR is housed in a 4-pin, 1.0 mm × 1.0 mm X2SON (DQN) package with exposed thermal pad connected to GND for enhanced thermal performance. The package is RoHS-compliant and optimized for automated assembly in high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESA1 and MCP1700T-3602E/MB, TLV71736PDQNR uniquely balances ultra-low dropout (215 mV), active pulldown, foldback current limiting, and 1-mm² footprint-making it optimal for consumer portable devices where size, fault safety, and efficiency under partial battery discharge are prioritized.

Availability

TLV71736PDQNR is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor node supply, industrial handheld terminals, and point-of-sale display backlight bias requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TLV71736PDQNR 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 delivering analog and embedded processing solutions, with leadership in power management ICs and precision analog components.

The TLV717P series was designed specifically for portable, battery-powered applications demanding low quiescent current, fast transient response, small footprint, and robust fault protection-including foldback current limiting and active output discharge.

FAQ

What is the minimum input voltage required for TLV71736PDQNR to regulate 3.6 V output at 150 mA?

The TLV71736PDQNR requires a minimum input voltage of 3.815 V to maintain regulation at 150 mA load, based on its 215 mV typical dropout voltage (V_DO = V_IN – V_OUT). Below this, the device enters dropout mode where output voltage drops linearly with input. This value is confirmed in the Electrical Characteristics table under "Dropout voltage" for V_OUT ≥ 1.8 V at I_OUT = 150 mA.

Does TLV71736PDQNR support zero-load operation, and what is its accuracy under no-load conditions?

Yes, TLV71736PDQNR regulates to specified accuracy with no output load. Its DC output accuracy is ±0.5% typical at +25°C and ±1.5% over –40°C to +85°C for V_OUT ≥ 1.2 V, including at 0 mA load. This is explicitly stated in the Electrical Characteristics table and confirmed in the Description section: "The devices regulate to specified accuracy with no output load."

How does the foldback current limit function in TLV71736PDQNR, and what is its practical benefit during a short-circuit event?

In TLV71736PDQNR, foldback current limit reduces output current as V_OUT decreases-initiating near 350 mA and dropping to ~40 mA at short-circuit (V_OUT ≈ 0 V). This lowers power dissipation [(V_IN – V_OUT) × I_LIMIT] in fault conditions, preventing thermal shutdown and enabling safer auto-recovery. The feature is detailed in Section 7.3.1 and Table 1 of the datasheet.

Can TLV71736PDQNR be used with a 0.1 µF output capacitor, and what does "effective capacitance" mean in this context?

Yes, TLV71736PDQNR is stable with an effective output capacitance of 0.1 µF or greater. "Effective capacitance" means the actual capacitance value present at the OUT pin under operating bias voltage and temperature-not the nominal rated value. For example, a 1-µF X7R MLCC may measure only 0.15 µF at 3.6 V bias and 85°C; TLV71736PDQNR requires that measured value to be ≥0.1 µF for stability.

What is the purpose and resistance value of the active pulldown circuit in TLV71736PDQNR, and when is it active?

The active pulldown circuit in TLV71736PDQNR is a 120 Ω internal resistor connecting OUT to GND. It activates automatically when the device is disabled (EN < 0.4 V) or during UVLO, rapidly discharging output capacitance to prevent floating voltages or unintended device wake-up. This is critical for power sequencing in multi-rail systems and is documented in Section 7.3.2 and the Pin Functions table.