Texas Instruments TPS79601DRBT

Overview

TPS79601DRBT from Texas Instruments is a 1A ultra-low-noise, high-PSRR, fast-transient LDO linear regulator in an 8-pin VSON (3mm × 3mm) package. It delivers 1.225V fixed output with ±2.5% accuracy over –40°C to +125°C, 220mV typical dropout at 1A, and 78μVRMS output noise (new chip). It powers noise-sensitive RF analog stages in portable transceivers and precision data converters.

For engineers reviewing the TPS79601DRBT datasheet, TPS79601DRBT pinout, TPS79601DRBT application, or TPS79601DRBT equivalent, key selection criteria include verified 78μVRMS noise performance, 74dB PSRR at 100Hz/1A, stable operation with 1μF ceramic output capacitor, and thermal shutdown at 170°C - all confirmed for the DRB-package TPS79601 variant.

Technical Context

The TPS79601DRBT implements a high-gain, high-bandwidth error amplifier architecture enabling excellent line/load transient response and high PSRR even at low headroom (VIN – VOUT). Its internal 1.225V bandgap reference feeds a PMOS pass transistor with integrated UVLO (1.28V rising threshold), thermal shutdown (170°C trip), and hybrid brick-wall/foldback current limiting (ICL = 1.04–1.65A, ISC = 550mA).

Unlike legacy versions, the TPS79601DRBT (new chip) features active discharge via internal pulldown MOSFET (RPULLDOWN = 100Ω), soft-start for inrush control, and revised NR/FB pin functionality - the NR pin is repurposed as NC/FB in the DRB package per Figure 4-5, eliminating external noise-reduction capacitor dependency while retaining low-noise performance.

Key Specifications

Pinout & Package

TPS79601DRBT uses an 8-pin VSON (DRB) package measuring 3mm × 3mm with exposed thermal pad. Pin 1 is EN; pins 2 and 7 are IN; pins 3 and 6 are OUT; pin 4 is GND; pin 5 is FB/NC; pin 8 is N/C. The package supports high-power density PCB layouts with low thermal resistance (RθJC(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 TPS79601DRBT, TPS7A9101DRBR offers superior noise performance but demands higher output capacitance and occupies more PCB area, while LP5907MFX-1.2/NOPB trades current capability for ultra-compact size and lower noise - making TPS79601DRBT the optimal balance of 1A delivery, 78μVRMS noise, and 3mm × 3mm footprint for RF/analog hybrid designs.

Availability

TPS79601DRBT is available at Aetrix Electronics and suitable for TV applications, building automation systems, and home theater equipment requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for TPS79601DRBT 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 power management technologies with over 90 years of innovation in high-reliability IC design.

The TPS796 family was engineered specifically for RF and precision analog applications demanding ultra-low noise, high PSRR, and fast transient response - targeting portable communications, medical imaging, and test equipment markets.

FAQ

What is the confirmed output voltage tolerance of TPS79601DRBT over temperature?

The TPS79601DRBT has a guaranteed output voltage tolerance of ±2.5% across the full operating junction temperature range of –40°C to +125°C, as specified in Section 5.5 Electrical Characteristics of the official TI datasheet SLVS351R. This applies specifically to the new-chip DRB-package variant and ensures reliable biasing of 1.2V-domain analog circuits in harsh environments.

Does TPS79601DRBT require an external noise-reduction capacitor?

No, the TPS79601DRBT (new chip) does not require an external noise-reduction capacitor. Per Figure 4-5 and Section 6.3.1, the NR pin is repurposed as FB/NC in the DRB package, and low-noise performance (78μVRMS) is achieved internally. Adding an external capacitor provides no benefit and may impair stability.

What is the minimum input voltage required for TPS79601DRBT to regulate at full 1A load?

The minimum input voltage for TPS79601DRBT to maintain regulation at 1A is 1.445V - calculated as VOUT + VDO = 1.225V + 0.220V (typical dropout). However, the absolute minimum VIN specification is 2.7V per Section 5.3 Recommended Operating Conditions, meaning the device is not rated for operation below 2.7V regardless of dropout margin.

How does the active discharge feature function in TPS79601DRBT?

The TPS79601DRBT integrates an internal pulldown MOSFET with 100Ω effective resistance that connects VOUT to GND when EN is low. This actively discharges the output capacitor within microseconds, preventing backfeed into upstream supplies and enabling safe hot-swap operation - a capability absent in legacy TPS796 variants.

Is TPS79601DRBT pin-compatible with other TPS796 DRB-package variants?

Yes, all TPS796xxDRBT parts share identical 8-pin VSON (DRB) pinout and footprint per Figure 4-4 and Figure 4-5. However, pin functions differ: TPS79601DRBT uses Pin 5 as FB/NC (no connection required), while adjustable versions use it as FB. Always verify pin function mapping in the specific variant's datasheet section "Pin Functions".