Texas Instruments TPS79650DRBR

Overview

TPS79650DRBR from Texas Instruments is a fixed-output 5.0 V, 1 A ultra-low-noise LDO linear regulator in an 8-pin VSON (DRB) package. It delivers 220 mV typical dropout at 1 A, 78 µV_RMS output noise (new chip), and 74 dB PSRR at 100 Hz/1 A - engineered for RF-sensitive analog circuits such as tuners and ADC front-ends in broadcast receivers.

For engineers reviewing the TPS79650DRBR datasheet, TPS79650DRBR pinout, TPS79650DRBR application, or TPS79650DRBR equivalent, key selection criteria include verified low-noise performance with 1 µF ceramic output capacitance, thermal shutdown at 170°C (new chip), and compatibility with fast load transient response in space-constrained 3 mm × 3 mm layouts.

Technical Context

The TPS79650DRBR uses a high-gain, high-bandwidth error amplifier to achieve excellent line and load regulation while maintaining high PSRR at low headroom (VIN – VOUT). Its internal bandgap reference (1.225 V) feeds a precision feedback loop, and the NR/FB pin supports external noise-reduction capacitor bypassing for legacy variants - though the new-chip revision replaces NR functionality with active discharge via integrated pulldown MOSFET.

This device implements undervoltage lockout (UVLO) with 1.28 V rising threshold and 130 mV hysteresis, plus hybrid brick-wall/foldback current limiting (ICL = 1.04–1.65 A, ISC = 550 mA) and thermal shutdown (trip at 170°C, reset at 155°C). All specifications are fully characterized from –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

TPS79650DRBR is housed in an 8-pin VSON (DRB) package measuring 3 mm × 3 mm × 0.9 mm, with exposed thermal pad on bottom for enhanced heat dissipation. R_θJA = 47.8°C/W (legacy chip), R_θJC(bot) = 12.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79650DRBR, TPS7A9101DRBR offers superior noise performance but insufficient current for 1 A loads, while TLV757P50DRVR provides compact size and lower cost at the expense of thermal robustness, PSRR, and protection features required in RF-critical systems.

Availability

TPS79650DRBR is available at Aetrix Electronics and suitable for TV tuner modules, high-speed ADC power rails, home theater audio DACs, and building automation sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS79650DRBR 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 TPS796 family was designed specifically for RF and high-fidelity analog applications demanding ultra-low noise, high PSRR, and fast transient response - targeting broadcast, test equipment, and industrial sensing markets.

FAQ

What is the maximum input voltage for the TPS79650DRBR?

The TPS79650DRBR supports a maximum input voltage of 6.0 V for the new-chip revision, as specified in its absolute maximum ratings. Exceeding this voltage risks permanent damage. Operation above 5.5 V requires verification of thermal margin due to increased power dissipation - especially at full 1 A load and elevated ambient temperatures.

Does the TPS79650DRBR require an external noise-reduction capacitor?

No - the TPS79650DRBR is a fixed-output variant of the new-chip revision, which does not use the NR pin for noise reduction. That function has been replaced by active output discharge. The NR/FB pin is internally connected to set the 5.0 V output; no external capacitor is needed or recommended for noise suppression.

Can the TPS79650DRBR operate with a 1 µF ceramic output capacitor?

Yes - the TPS79650DRBR is explicitly characterized and guaranteed stable with a minimum 1 µF ceramic output capacitor, as confirmed in Section 5.3 Recommended Operating Conditions and Figure 5-31–5-33 stability regions. This eliminates reliance on higher-ESR capacitors and simplifies design for compact layouts.

What is the purpose of the dual IN and OUT pins on the TPS79650DRBR DRB package?

The dual IN (Pins 1, 7) and dual OUT (Pins 2, 6) pins on the TPS79650DRBR reduce parasitic inductance and resistance in high-current paths. This improves high-frequency PSRR, lowers voltage drop under 1 A load, and enhances thermal spreading across the package - critical for maintaining regulation accuracy and junction temperature in dense PCB layouts.

How does the enable pin behavior differ between legacy and new-chip versions of the TPS79650DRBR?

The TPS79650DRBR is a new-chip revision, so its EN pin requires only 0.85 V minimum for logic-high recognition (vs. 1.7 V for legacy), and includes an internal 100 Ω pulldown resistor. When disabled, it actively discharges the output via this resistor - a feature absent in legacy versions. This enables cleaner power-down sequencing in modern low-voltage systems.