Texas Instruments TLV717185PDQNT

Overview

TLV717185PDQNT from Texas Instruments is a 150-mA, low-dropout linear regulator with 1.85 V fixed output, 215 mV dropout at full load, 0.5% typical accuracy, 35 µA quiescent current, and foldback current limiting. It delivers stable power to RF-sensitive subsystems in portable electronics where low noise and minimal input-output headroom are critical.

For engineers reviewing the TLV717185PDQNT datasheet, TLV717185PDQNT pinout, TLV717185PDQNT application, or TLV717185PDQNT equivalent, key selection criteria include dropout voltage at 150 mA, PSRR performance at 1 kHz/1 MHz, output stability with 0.1 µF ceramic capacitors, active pulldown functionality, and operation across –40°C to +85°C junction temperature.

Technical Context

The TLV717185PDQNT uses a PMOS pass transistor architecture enabling ultra-low dropout (215 mV at 150 mA for VOUT ≥ 1.8 V) and inherent reverse-voltage protection via the body diode. Its foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing thermal stress during faults.

It integrates undervoltage lockout (UVLO = 1.6 V), an active-high enable pin (VIH = 0.9 V, VIL = 0.4 V), and an internal 120 Ω pulldown resistor for rapid output discharge during shutdown - all operating within a –40°C to +85°C junction temperature range.

Key Specifications

Pinout & Package

TLV717185PDQNT is housed in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with wettable flanks and an exposed thermal pad connected to GND for enhanced thermal dissipation in compact PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV717185PDQNT, TPS7A05185PDBVR offers lower dropout (170 mV) and quiescent current (25 µA) in identical footprint, while TPL7407LPGQ serves a fundamentally different function as a driver IC and cannot replace the LDO's regulation capability.

Availability

TLV717185PDQNT is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth Low Energy modules, and industrial wireless nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLV717185PDQNT 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 IQ, fast transient response, and robust fault protection - targeting smartphones, wearables, and IoT edge devices.

FAQ

What is the minimum input voltage required for TLV717185PDQNT to regulate 1.85 V at 150 mA?

The TLV717185PDQNT requires a minimum input voltage of 2.065 V to maintain regulation at 150 mA, calculated as VOUT + VDO = 1.85 V + 0.215 V. Below this, the device enters dropout mode where output voltage drops linearly with input.

Does TLV717185PDQNT require an external pull-up resistor on the EN pin?

No, TLV717185PDQNT does not require an external pull-up on EN. Its enable threshold is VIH = 0.9 V (min), compatible with 1.8 V GPIO logic levels. If left unconnected, EN floats high internally due to weak pull-up - but TI recommends tying EN to IN for default-on operation.

Can TLV717185PDQNT operate with a 0.1 µF output capacitor, and what dielectric type is recommended?

Yes, TLV717185PDQNT is stable with a minimum 0.1 µF effective output capacitance. TI recommends X5R or X7R ceramic capacitors due to their stable capacitance and low ESR over temperature and bias voltage - essential to maintain the specified 0.1 µF effective value.

What is the purpose of the active pulldown resistor in TLV717185PDQNT, and what is its nominal value?

The active pulldown resistor (120 Ω nominal) in TLV717185PDQNT rapidly discharges the output capacitor when the device is disabled via EN, preventing floating voltages that could cause unintended behavior in downstream circuitry. This feature eliminates need for external discharge components.

How does the foldback current limit in TLV717185PDQNT improve system reliability compared to a fixed current limit?

The foldback current limit in TLV717185PDQNT reduces output current as output voltage collapses during overload, lowering power dissipation in the pass transistor. At short-circuit, it limits current to 40 mA (typ), reducing worst-case power loss by >90% versus a fixed 150 mA limit - significantly improving thermal safety and board-level reliability.