Texas Instruments TPS79428DGNRG4

Overview

TPS79428DGNRG4 from Texas Instruments is a 2.8 V fixed-output, 250 mA low-dropout linear regulator in HVSSOP-8 (DGN) package, featuring 155 mV typical dropout at full load, 60 dB PSRR at 10 kHz, and 33 µV_RMS output noise with 0.01 µF NR capacitor - deployed in noise-sensitive RF power rails for smartphones and connected peripherals.

For engineers reviewing the TPS79428DGNRG4 datasheet, TPS79428DGNRG4 pinout, TPS79428DGNRG4 application, or TPS79428DGNRG4 equivalent, key selection criteria include dropout voltage under 250 mA load, PSRR performance above 10 kHz, thermal derating in HVSSOP-8, and compatibility with 2.2 µF ceramic output capacitors without external compensation.

Technical Context

The TPS79428DGNRG4 implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its internal 1.225 V bandgap reference feeds a precision error amplifier that maintains output regulation across –40°C to +125°C junction temperature with ±3% initial accuracy and <10 mV load regulation.

It integrates undervoltage lockout (UVLO) with 1.32–1.6 V rising threshold (new chip), active-high enable with 0.425 V logic-low threshold, and foldback current limiting (320–460 mA I_CL, 175 mA I_SC) - all operating stably with only 2.2 µF ceramic C_OUT and no feed-forward capacitor required.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3 mm × 4.9 mm body with exposed thermal pad; optimized for high thermal conductivity on PCBs with 2-layer or greater copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79428DRVR and TPS7A2028PDQNR, the TPS79428DGNRG4 uniquely balances HVSSOP-8 footprint density, 250 mA delivery, 64 dB PSRR at 10 kHz, and proven RF noise performance - making it the preferred choice for space-constrained, noise-sensitive, medium-current applications.

Availability

TPS79428DGNRG4 is available at Aetrix Electronics and suitable for smartphone baseband power, USB peripheral bias rails, and home theater audio DAC supplies requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TPS79428DGNRG4 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.

The TPS794 family was engineered for noise-sensitive portable electronics - delivering ultra-low dropout, high PSRR, and fast transient response in compact packages for RF and audio signal chains.

FAQ

What is the maximum input voltage rating for the TPS79428DGNRG4?

The TPS79428DGNRG4 has an absolute maximum input voltage of 6.5 V for the new-chip revision. Operation above this level risks permanent damage. The recommended operating range is 2.7 V to 5.5 V, ensuring optimal dropout performance and thermal margin. Always verify VIN against the specific revision's datasheet section 5.1 Absolute Maximum Ratings before final design validation.

Does the TPS79428DGNRG4 require an external noise-reduction capacitor?

No - the TPS79428DGNRG4 is a new-chip revision where the NR/NC pin (Pin 4) is not internally connected. It does not require an external noise-reduction capacitor. For lowest output noise (33 µV_RMS), use a 0.01 µF capacitor on the legacy version only; the new chip achieves comparable noise without it, simplifying BOM and layout.

Can the TPS79428DGNRG4 be used with a 1 µF output capacitor?

Yes - the TPS79428DGNRG4 is stable with a minimum 1.0 µF ceramic output capacitor, though 2.2 µF is recommended for optimal transient response and PSRR. The device's internal compensation eliminates need for external feed-forward capacitors, and stability is maintained across 0.47 µF to 10 µF C_OUT values per section 5.3 Recommended Operating Conditions.

What is the shutdown current of the TPS79428DGNRG4 when EN = 0 V?

The TPS79428DGNRG4 draws 0.01 µA to 1 µA shutdown current when EN = 0 V and VIN is between 2.7 V and 5.5 V (new-chip specification). This ultra-low I_SHDN enables true "off" states in battery-backed systems, preserving energy during extended sleep modes without requiring external disconnect switches.

Is the TPS79428DGNRG4 pin-compatible with other TPS794 variants in HVSSOP-8?

Yes - all TPS794 variants in the DGN (HVSSOP-8) package share identical pinout, including TPS79428DGNRG4, TPS79430DGNRG4, and TPS79433DGNRG4. The only functional differences are fixed output voltage (2.8 V, 3.0 V, or 3.3 V) and minor parameter shifts (e.g., dropout, noise) tied to V_OUT; no PCB redesign is needed when swapping within the DGN family.