Texas Instruments TPS79425DGNR

Overview

TPS79425DGNR from Texas Instruments is a 2.5V fixed-output, 250mA low-dropout linear regulator in HVSSOP-8 package, featuring 155mV typical dropout at full load, 60dB PSRR at 10kHz, and fast 50µs startup - deployed in noise-sensitive analog rails for smartphones and TV power management.

For engineers reviewing the TPS79425DGNR datasheet, TPS79425DGNR pinout, TPS79425DGNR application, or TPS79425DGNR equivalent, this page delivers verified electrical specs, thermal metrics, enable-controlled shutdown behavior, and real-world transient response data for LDO selection in portable RF and consumer electronics.

Technical Context

The TPS79425DGNR implements a PMOS pass transistor architecture with internal 1.225V bandgap reference, undervoltage lockout (UVLO) threshold of 1.32–1.6V (new chip), and active discharge via internal pulldown MOSFET upon EN deactivation. It operates stably with only 2.2µF ceramic output capacitance.

Its feedback loop supports fixed-output configuration (no external resistor divider), while the NR/NC pin is unconnected internally - requiring GND tie for thermal enhancement but offering no noise reduction function in this variant. The device enforces foldback current limiting (320–460mA ICL) and thermal shutdown at ~165°C.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3mm × 4.9mm body with exposed PowerPad for enhanced thermal dissipation; JEDEC MSOP-8 footprint with thermal pad soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79425DGNR, TPS7A2025PDQNR trades 50mA output headroom and active discharge for nanoamp quiescent current, while MCP1700T-2502E/MB sacrifices PSRR bandwidth, enable control, and dropout performance for lower unit cost in static loads.

Availability

TPS79425DGNR is available at Aetrix Electronics and suitable for smartphone power management, TV audio subsystems, building automation sensor nodes, and connected printer designs requiring stable component supply and long-term production continuity.

Supply support for TPS79425DGNR 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 LDO design expertise and broad automotive, industrial, and consumer qualification.

The TPS794 family was engineered for noise-sensitive analog power domains in portable electronics - prioritizing PSRR, low dropout, and fast transient response over ultra-low I_Q, targeting RF front-ends, audio codecs, and precision sensor interfaces.

FAQ

What is the maximum input voltage for TPS79425DGNR?

The TPS79425DGNR supports a maximum input voltage of 6.5V under recommended operating conditions. Absolute maximum rating is 6.5V for new-chip versions; exceeding this risks permanent damage. Always maintain VIN ≤ 6.5V and ensure sufficient margin above 2.5V output to sustain regulation - minimum VIN is 2.65V (2.5V + 155mV dropout).

Does TPS79425DGNR require an external noise reduction capacitor?

No, the TPS79425DGNR does not use the NR/NC pin for noise reduction - it is internally unconnected in the new-chip revision. While tying NR/NC to GND improves thermal performance, it provides no PSRR or noise benefit. For lower-noise alternatives with functional NR pins, consider legacy TPS794xx variants or TPS7A20 series.

Can TPS79425DGNR be used without connecting the EN pin?

Yes, TPS79425DGNR operates continuously when EN is tied directly to IN (i.e., pulled high to VIN). This configuration disables shutdown capability but simplifies layout in always-on applications. If power sequencing or low-quiescent operation is required, drive EN with a logic signal meeting V_EN(HI) ≥ 0.85×VIN and V_EN(LOW) ≤ 0.425V.

What thermal resistance values apply to TPS79425DGNR in HVSSOP-8 package?

For TPS79425DGNR in DGN (HVSSOP-8) package, R_θJA is 51.9°C/W (new chip, with PowerPad soldered), R_θJC(bot) is 7.6°C/W, and R_θJB is 25.3°C/W. These values assume 2-in² 2-oz copper on bottom layer connected to PowerPad. Derate power dissipation accordingly: P_D(max) = (125°C – T_A) / R_θJA.

Is TPS79425DGNR compatible with ceramic output capacitors smaller than 2.2µF?

Yes - the new-chip TPS79425DGNR is stable with a minimum effective output capacitance of 0.47µF (X5R/X7R ceramic), though TI recommends ≥2.2µF for optimal transient response and PSRR. Using <2.2µF may reduce load-step immunity and increase output voltage deviation during 250mA transients; verify stability per Figure 6-33/34 in datasheet.