Texas Instruments TPS7A20L28PDQNR

Overview

TPS7A20L28PDQNR from Texas Instruments is a 300mA, low-noise, ultra-low-quiescent-current LDO voltage regulator with fixed 2.8V output, 7μVRMS output noise, 95dB PSRR at 1kHz, and 6.5μA quiescent current. It operates from 1.6V to 6.0V input and delivers ±1.5% output accuracy over load, line, and temperature - designed for RF and precision analog power rails in space-constrained portable systems.

For engineers reviewing the TPS7A20L28PDQNR datasheet, TPS7A20L28PDQNR pinout, TPS7A20L28PDQNR application, or TPS7A20L28PDQNR equivalent, this device is selected for battery-powered applications requiring stable low-noise biasing of ADCs, RF transceivers, and sensor front-ends where minimal board area and shutdown current (<0.2μA) are critical.

Technical Context

The TPS7A20L28PDQNR integrates a precision bandgap reference and low-dropout pass element optimized for high PSRR across 100Hz–1MHz while maintaining stability with only 1µF ceramic output capacitance. Its smart enable circuit includes a 500kΩ internal pulldown resistor and 1.2V logic-compatible thresholds (VEN(HI) = 0.75V, VEN(LOW) = 0.43V), eliminating external pull-down components.

It features internal soft-start to limit inrush current, automatic output discharge via 150Ω pulldown during shutdown, and thermal shutdown at 165°C. Dropout voltage is 140mV max at 300mA (VOUT = 3.3V), scaling per output voltage - e.g., 200mV at 2.5V output - enabling efficient operation across its 0.8V–5.5V programmable range (though this variant is fixed at 2.8V).

Key Specifications

Pinout & Package

TPS7A20L28PDQNR uses the DQN package: a 4-pin, 1mm × 1mm X2SON with exposed thermal pad (Pin 5). The compact footprint supports high-density layouts in smartphones, wearables, and network cameras.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR (a driver array) and TPS7A0528PDBVR (a higher-noise, higher-IQ LDO), the TPS7A20L28PDQNR uniquely balances ultra-low noise (7μVRMS), ultra-low IQ (6.5μA), and miniature 1mm² X2SON packaging - making it the optimal choice for next-generation RF and precision analog subsystems where every microamp and microvolt matters.

Availability

TPS7A20L28PDQNR is available at Aetrix Electronics and suitable for smartphones and tablets, IP network cameras, portable medical equipment, and smart meters requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for TPS7A20L28PDQNR 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, signal chain, and high-reliability ICs.

The TPS7A20L series is engineered for ultra-low-noise, ultra-low-IQ power delivery in space-constrained, battery-operated systems - targeting RF infrastructure, portable medical, and industrial sensing applications demanding precision analog biasing.

FAQ

What is the output voltage tolerance of the TPS7A20L28PDQNR over temperature and load?

The TPS7A20L28PDQNR has a maximum output voltage tolerance of ±1.5% across –40°C to +125°C junction temperature, 1mA to 300mA load, and 1.6V to 6.0V input voltage - verified per TI's SBVS447 datasheet Section 5.5. This tight tolerance ensures reliable operation of 2.8V-specified analog ICs without external trimming or calibration in field-deployed TPS7A20L28PDQNR-based designs.

Does the TPS7A20L28PDQNR require an external noise-bypass capacitor?

No, the TPS7A20L28PDQNR does not require an external noise-bypass capacitor. Its 7μVRMS output noise (10Hz–100kHz) is achieved through internal design innovations, as confirmed in the "Features" section of the official datasheet. This eliminates a common external component, reducing solution size and improving reliability in TPS7A20L28PDQNR implementations.

What is the minimum output capacitance required for stability with the TPS7A20L28PDQNR?

The TPS7A20L28PDQNR is stable with a minimum 1µF ceramic output capacitor, as specified in Section 5.3 (Recommended Operating Conditions) and Section 5.5 (Electrical Characteristics) of the SBVS447 datasheet. Using ≥1µF X7R/X5R ceramic capacitors placed close to the OUT and GND pins ensures phase margin compliance and transient robustness in all TPS7A20L28PDQNR applications.

How does the enable input of the TPS7A20L28PDQNR interface with 1.2V logic?

The TPS7A20L28PDQNR enable input is explicitly 1.2V logic compatible, with VEN(HI) = 0.75V (min) and VEN(LOW) = 0.43V (max). This allows direct connection to 1.2V GPIO outputs from modern ultra-low-voltage MCUs and FPGAs without level shifters - a key feature validated in the "Pin Functions" table of the SBVS447 datasheet for the TPS7A20L28PDQNR.

What thermal performance can be expected from the TPS7A20L28PDQNR in the X2SON package?

In the 1mm × 1mm X2SON (DQN) package, the TPS7A20L28PDQNR has a junction-to-board thermal resistance (RθJB) of 110.6°C/W and junction-to-ambient (RθJA) of 166.1°C/W when mounted on a standard 2-layer JEDEC board. Connecting the thermal pad to a solid GND plane is essential to achieve these values and maintain safe operation below 125°C junction temperature under 300mA load - per Section 5.4 of the SBVS447 datasheet.