Texas Instruments TPS7A20185PDQNRM3

Overview

TPS7A20185PDQNRM3 from Texas Instruments is a 300mA ultra-low-noise, low-I_Q, high-PSRR LDO regulator in a 1mm × 1mm X2SON-4 package, delivering 1.85V output with ±1.5% tolerance, 7μV_RMS noise (no bypass cap required), and 95dB PSRR at 1kHz - designed for RF power supply filtering in battery-powered wearables and portable medical sensors.

For engineers reviewing the TPS7A20185PDQNRM3 datasheet, TPS7A20185PDQNRM3 pinout, TPS7A20185PDQNRM3 application, or TPS7A20185PDQNRM3 equivalent, key selection criteria include dropout voltage (140mV max @ 300mA), smart enable pulldown (500kΩ internal), stability with 1µF ceramic output capacitor, and thermal performance in ultra-compact X2SON packaging.

Technical Context

The TPS7A20185PDQNRM3 employs a precision bandgap reference and low-noise error amplifier architecture to achieve 7μV_RMS output noise without external bypass capacitance. Its high PSRR (95dB @ 1kHz) stems from multi-stage regulation and optimized internal compensation.

It integrates a smart enable input with an internal 500kΩ pulldown resistor that holds the device disabled when EN floats, eliminating external pull-down components. The LDO remains stable with ≥1µF ceramic output capacitors and features internal soft-start to limit inrush current during power-up.

Key Specifications

Pinout & Package

TPS7A20185PDQNRM3 uses the 1mm × 1mm X2SON-4 package (DQN), featuring wettable flank terminations for automated optical inspection and optimized thermal performance via exposed thermal pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A20185PDBVR and MCP1700T-1802E/MB, the TPS7A20185PDQNRM3 delivers superior noise performance (7 vs 17μV_RMS) and tighter output accuracy (±1.5% vs ±2%) in the smallest footprint, making it optimal for space-constrained, high-fidelity analog power domains.

Availability

TPS7A20185PDQNRM3 is available at Aetrix Electronics and suitable for wearable health monitors, portable medical sensors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant ultra-small packaging.

Supply support for TPS7A20185PDQNRM3 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 specializing in analog and embedded processing technologies, with over 90 years of innovation in power management, signal chain, and connectivity solutions.

The TPS7A20 family was engineered for ultra-low-noise, low-I_Q power delivery in space-constrained, battery-operated systems - targeting RF, medical, and industrial sensing applications demanding high PSRR and minimal solution size.

FAQ

What is the maximum output current capability of the TPS7A20185PDQNRM3?

The TPS7A20185PDQNRM3 delivers up to 300mA of continuous output current under recommended operating conditions. This rating is validated across temperature (–40°C to +125°C) and input voltage (1.6V to 6.0V). Internal current limiting activates at ~520mA (typical), providing robust short-circuit protection without external components. The TPS7A20185PDQNRM3 maintains regulation within ±1.5% output tolerance even at full 300mA load.

Does the TPS7A20185PDQNRM3 require an external noise-bypass capacitor?

No, the TPS7A20185PDQNRM3 does not require an external noise-bypass capacitor. Its proprietary low-noise architecture achieves 7μV_RMS output noise (10Hz–100kHz) inherently, eliminating the need for a dedicated 10nF–100nF bypass capacitor. This simplifies design, reduces bill-of-materials cost, and improves long-term reliability by removing a failure-prone passive component.

What is the dropout voltage specification for the TPS7A20185PDQNRM3 at full load?

The TPS7A20185PDQNRM3 has a maximum dropout voltage of 140mV at 300mA output current when regulating 3.3V, and 145mV for the DBV variant. For its configured 1.85V output, dropout is 200mV (max) at 300mA per datasheet Section 5.5. This enables operation from inputs as low as 2.05V, supporting extended runtime in single-cell Li-ion and 2-cell alkaline battery applications.

How does the smart enable function work on the TPS7A20185PDQNRM3?

The TPS7A20185PDQNRM3 features a smart enable input with an internal 500kΩ pulldown resistor. When the EN pin is left unconnected (floating), this resistor pulls EN low, ensuring the device remains disabled by default - preventing unintended power-up. Once driven above V_EN(HI) = 0.9V (min), the pulldown disconnects to minimize leakage, enabling the LDO with 750–1150μs start-up time to 95% of 1.85V.

Is the TPS7A20185PDQNRM3 stable with a 1µF ceramic output capacitor?

Yes, the TPS7A20185PDQNRM3 is explicitly characterized and guaranteed stable with a minimum 1µF ceramic output capacitor (X5R/X7R, ≤100mΩ ESR). This requirement is validated across all operating conditions (–40°C to +125°C, 1.6V–6.0V input, 0–300mA load). Using ≥1µF ensures adequate phase margin and transient response without needing larger or higher-ESR alternatives.