Texas Instruments TPS7A2128PYWDJ

Overview

TPS7A2128PYWDJ from Texas Instruments is a 500-mA, ultra-low-noise, low-I_Q LDO voltage regulator in a 0.602-mm × 0.602-mm DSBGA package, delivering 2.8 V output with ±1.5% tolerance over line/load/temperature, 7.7 µV_RMS noise, and 91 dB PSRR at 1 kHz - optimized for RF power supplies in space-constrained portable electronics.

For engineers reviewing the TPS7A2128PYWDJ datasheet, TPS7A2128PYWDJ pinout, TPS7A2128PYWDJ application, or TPS7A2128PYWDJ equivalent, this page provides verified electrical specs, validated DSBGA-4 pin functions, confirmed RF/analog use cases, and two documented alternative LDOs with explicit functional and application-level differences.

Technical Context

The TPS7A2128PYWDJ integrates a precision bandgap reference and low-pass RC noise filter (–3-dB at ~0.1 Hz) to achieve 7.7 µV_RMS output noise without external bypass capacitors. Its smart EN circuit includes a 440-kΩ internal pulldown resistor that disconnects during enable to minimize I_Q, supporting reliable startup even from weak-drive logic sources.

It employs a CMOS pass transistor with R_DS(ON) scaled to deliver ≤175 mV dropout at 500 mA (for V_OUT ≥ 2.5 V), while foldback current limiting (ICL = 740–1500 mA, ISC = 325 mA) and thermal shutdown (T_J = 165°C rise) protect against sustained overload and short-circuit faults.

Key Specifications

Pinout & Package

TPS7A2128PYWDJ uses a 4-pin, 0.602 mm × 0.602 mm DSBGA (YWD) package with bottom-side ball layout. Thermal performance is characterized by R_θJA = 197.1°C/W and R_θJB = 52.4°C/W, requiring minimal PCB copper for handheld thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2128PYWDJ, TPS7A2028PDQNR trades current capacity and thermal headroom for minimal size, while MCP1826-2802E/DB offers lower cost at the expense of noise/PSRR performance - making TPS7A2128PYWDJ the only option meeting simultaneous 500-mA, <10-µV_RMS, and >90-dB PSRR requirements in sub-0.36-mm² area.

Availability

TPS7A2128PYWDJ is available at Aetrix Electronics and suitable for RF power supplies, wearable sensor biasing, IP camera image sensors, smart meter analog front-ends, and portable medical equipment requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS7A2128PYWDJ 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, embedded processing, and connectivity technologies, with decades of LDO design heritage focused on precision, efficiency, and reliability.

The TPS7A21 product line delivers ultra-low-noise, low-I_Q LDOs for RF, medical, and portable applications where power integrity directly impacts signal fidelity and battery lifetime.

FAQ

What is the maximum output current and dropout voltage specification for TPS7A2128PYWDJ?

The TPS7A2128PYWDJ delivers up to 500 mA output current with a maximum dropout voltage of 175 mV at that load for V_OUT ≥ 2.5 V. This allows reliable 2.8-V regulation from a 3.0-V input source across temperature, supporting battery-powered designs with tight voltage margins. The dropout is confirmed in TI's SBVS398A datasheet Section 6.5.

Does TPS7A2128PYWDJ require an external noise bypass capacitor?

No, the TPS7A2128PYWDJ does not require an external noise bypass capacitor. Its integrated low-pass RC filter (–3-dB at ~0.1 Hz) achieves 7.7 µV_RMS output noise (10 Hz–100 kHz) without added components - a key differentiator confirmed in the Features and Detailed Description sections of the official datasheet.

What is the function of the EN pin on TPS7A2128PYWDJ, and what happens when it is left unconnected?

The EN pin on TPS7A2128PYWDJ is an active-high enable input with an internal 440-kΩ pulldown resistor. When left unconnected, the pulldown holds EN below V_EN(LOW) (0.3 V), ensuring the device remains disabled by default - eliminating the need for external pull-down resistors in space-constrained layouts.

Can TPS7A2128PYWDJ be used with small ceramic output capacitors, and what is the minimum recommended value?

Yes, TPS7A2128PYWDJ is stable with ceramic output capacitors from 1 µF to 200 µF. The minimum effective capacitance is 0.4 µF across all operating conditions (voltage and temperature), as specified in Section 6.3 of the datasheet. A 1-µF X7R ceramic capacitor placed close to the OUT and GND pins meets both stability and size requirements.

What thermal protection features are built into TPS7A2128PYWDJ?

The TPS7A2128PYWDJ includes thermal shutdown (TSD) that disables the output when junction temperature reaches 165°C (rising threshold), with hysteresis to 140°C (falling threshold). This protects against sustained overload or poor PCB thermal design. The device automatically recovers once cooled, as documented in Section 6.5 Electrical Characteristics.