Texas Instruments TPS79328DBVRG4

Overview

TPS79328DBVRG4 from Texas Instruments is a fixed-output 2.8 V, 200-mA low-dropout linear regulator optimized for noise-sensitive RF and analog circuits. It delivers 32 µV_RMS output noise (with 0.1 µF NR capacitor), 70 dB PSRR at 10 kHz, and 120–200 mV dropout at 200 mA - enabling stable power for VCOs, ADCs, and Bluetooth® transceivers in portable battery-powered systems.

For engineers reviewing the TPS79328DBVRG4 datasheet, TPS79328DBVRG4 pinout, TPS79328DBVRG4 application, or TPS79328DBVRG4 equivalent, key selection criteria include ultralow noise performance, SOT-23-6 package compatibility, fast 50 µs startup with 0.001 µF bypass capacitor, and support for stable operation with only 2.2 µF ceramic output capacitance.

Technical Context

The TPS79328DBVRG4 uses a PMOS pass transistor architecture with integrated bandgap reference, undervoltage lockout (UVLO), and thermal shutdown. Its proprietary BiCMOS process enables 112–200 mV dropout across load and temperature while maintaining sub-1 µA shutdown current.

It features a dedicated Noise Reduction (NR) pin that accepts an external capacitor to suppress internal bandgap noise, directly improving PSRR and reducing output spectral noise density - critical for RF signal chains where supply-induced phase noise degrades VCO performance.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm footprint, 1.3 mm height, surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F28-DBVR and LP5907MFX-2.8/NOPB, the TPS79328DBVRG4 uniquely combines 32 µV_RMS noise, 70 dB PSRR at 10 kHz, and a configurable NR pin - making it the only option among the three capable of meeting stringent phase-noise budgets in 2.4 GHz VCO applications.

Availability

TPS79328DBVRG4 is available at Aetrix Electronics and suitable for RF front-end modules, portable audio subsystems, and precision ADC reference designs requiring stable component supply across industrial temperature ranges (–40°C to +125°C).

Supply support for TPS79328DBVRG4 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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability, low-noise power solutions.

The TPS793 family was designed specifically for noise-sensitive, battery-powered RF and portable analog systems - emphasizing ultralow noise, high PSRR, fast transient response, and minimal external component count in compact wafer-level and SOT packages.

FAQ

What is the minimum input voltage required for stable 2.8 V output from the TPS79328DBVRG4?

The TPS79328DBVRG4 requires VIN ≥ 3.0 V for stable 2.8 V output at 200 mA, based on its maximum dropout voltage of 200 mV. At lighter loads, dropout decreases - e.g., 120 mV at 200 mA implies VIN ≥ 2.92 V minimum under nominal conditions. Always maintain VIN ≥ VOUT + VDO(max) across temperature and load extremes per datasheet Section 6.5.

Can the TPS79328DBVRG4 operate without the NR (Noise Reduction) capacitor?

Yes, the TPS79328DBVRG4 functions without the NR capacitor, but output noise increases significantly: from 32 µV_RMS (with 0.1 µF NR) to 55 µV_RMS (with 0.001 µF NR). PSRR also degrades - especially above 1 kHz - due to loss of bandgap noise filtering. For RF or high-precision analog use, TI specifies 0.001–0.1 µF on NR as mandatory for achieving rated noise and PSRR performance.

Is the TPS79328DBVRG4 pin-compatible with other TPS793 variants in SOT-23-6?

Yes - all fixed-output TPS793x DBV variants (e.g., TPS79318, TPS79330, TPS79333) share identical SOT-23-6 pinout and footprint. Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NR, Pin 5 = NC, Pin 6 = OUT. This allows drop-in voltage replacement across the family without PCB redesign, provided thermal and layout constraints remain valid.

What is the recommended output capacitor for the TPS79328DBVRG4, and why is ESR important?

TI specifies a minimum 2.2 µF ceramic capacitor (X5R/X7R dielectric) for C_OUT, with ESR ≤ 30 mΩ. Low ESR ensures loop stability and fast transient response - high-ESR capacitors (e.g., aluminum electrolytic) cause oscillation or excessive overshoot during load steps. The 2.2 µF value is validated for stability across –40°C to +125°C; larger values (up to 10 µF) improve transient suppression but do not affect stability.

Does the TPS79328DBVRG4 include thermal shutdown and current limiting protection?

Yes, the TPS79328DBVRG4 integrates both thermal shutdown (trips at ~165°C junction, re-enables at ~140°C) and foldback current limiting (~285–600 mA). These protections prevent damage during overload or poor heatsinking. However, continuous thermal cycling degrades reliability - TI specifies max TJ = 125°C for continuous operation. Designers must verify junction temperature using R_θJA = 225.1°C/W and actual power dissipation.