Texas Instruments TPS79228DBVTG4

Overview

TPS79228DBVTG4 from Texas Instruments is a fixed-output 2.8 V, 100 mA ultra-low-noise low-dropout linear regulator in SOT-23-5 package, featuring 55 mV typical dropout voltage, 69 µV_RMS output noise (new chip), and 64 dB PSRR at 100 kHz - designed for powering RF analog front-ends and precision ADCs in battery-operated portable electronics.

For engineers reviewing the TPS79228DBVTG4 datasheet, TPS79228DBVTG4 pinout, TPS79228DBVTG4 application, or TPS79228DBVTG4 equivalent, key selection criteria include verified 2.8 V output accuracy (±2%), fast 500 µs startup time (new chip), thermal shutdown and UVLO protection, and compatibility with 2.2 µF ceramic output capacitors without external compensation.

Technical Context

The TPS79228DBVTG4 implements a PMOS pass transistor architecture with internal bandgap reference, undervoltage lockout (UVLO) threshold of 1.32–1.6 V, and active-high enable logic. It operates across –40°C to +125°C junction temperature with input voltage range 2.7–5.5 V and supports stable regulation down to 2.7 V input for 2.8 V output.

This device delivers high power-supply rejection ratio (PSRR) - 72 dB at 100 Hz and 49 dB at 10 kHz under 100 mA load - and integrates foldback current limiting (320–460 mA I_CL) plus thermal shutdown at ~165°C. The new-chip variant replaces the legacy NR pin with NC and adds active discharge via internal pulldown MOSFET.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.9 mm × 2.8 mm footprint, 1.45 mm height, thermally enhanced bottom pad (GND-connected). Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NC/NR (no-connect for new chip), Pin 5 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79228DBVTG4, the TPS7A2028PDQNR offers superior noise performance at higher input voltage constraints, while the MCP1703T-2802E/MB trades noise and speed for broader input tolerance and lower unit cost - making TPS79228DBVTG4 the optimal balance of ultra-low noise, fast response, and 2.7 V battery compatibility.

Availability

TPS79228DBVTG4 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable audio systems, smartphone camera modules, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS79228DBVTG4 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 decades of expertise in precision power management ICs.

The TPS792xx family was engineered specifically for noise-critical, battery-powered RF and analog applications - prioritizing ultra-low output noise, high PSRR, and minimal dropout to extend runtime while preserving signal fidelity.

FAQ

What is the output voltage tolerance of the TPS79228DBVTG4 across temperature and load?

The TPS79228DBVTG4 delivers a fixed 2.8 V output with ±2% accuracy (2.744 V to 2.856 V) over the full operating junction temperature range (–40°C to +125°C) and output current range (0–100 mA), as specified in the Electrical Characteristics table for legacy and new chip variants. This tight tolerance ensures reliable biasing of 2.8 V analog circuits without external trimming.

Does the TPS79228DBVTG4 require an external noise-reduction capacitor?

No - the TPS79228DBVTG4 (new chip revision) does not use the NR pin; Pin 4 is designated NC (no-connect). Unlike the legacy version, it achieves 69 µV_RMS output noise without external bypass capacitors on the NR terminal. For optimal performance, TI recommends connecting Pin 4 to GND to improve thermal dissipation and reduce EMI susceptibility.

Can the TPS79228DBVTG4 operate from a single-cell Li-ion battery throughout its discharge curve?

Yes - the TPS79228DBVTG4 supports input voltages from 2.7 V to 5.5 V and features a 55 mV typical dropout voltage at 100 mA. With a nominal 2.8 V output, it remains functional down to ~2.855 V input, covering >90% of a standard 3.0–4.2 V Li-ion discharge profile. Its 1.32–1.6 V UVLO threshold also prevents erratic behavior during deep discharge.

How does the active discharge function work on the TPS79228DBVTG4?

When the EN pin is driven low, the TPS79228DBVTG4 activates an internal pulldown MOSFET that connects the OUT pin to GND through a defined resistance, rapidly discharging the output capacitor. This prevents floating voltage on downstream circuits during power-down sequencing and eliminates need for external bleed resistors in multi-rail systems using TPS79228DBVTG4.

What output capacitor value is required for stability with the TPS79228DBVTG4?

The TPS79228DBVTG4 is stable with a minimum 2.2 µF ceramic output capacitor (X5R or X7R dielectric) placed adjacent to the OUT and GND pins. For new-chip variants, the effective capacitance must be ≥0.47 µF; however, 2.2 µF is the recommended minimum for guaranteed phase margin and transient response across temperature and load. Larger values (up to 10 µF) further improve PSRR and load step recovery.