Texas Instruments TPS79101DBVRG4

Overview

TPS79101DBVRG4 from Texas Instruments is an adjustable-output, 100-mA ultra-low-noise LDO linear regulator in a 5-pin SOT-23 (DBV) package. It delivers 15 µV_RMS output noise with 0.1 µF bypass capacitance, 70 dB PSRR at 10 kHz, and 38 mV dropout at full load (TPS79147 variant), targeting RF-sensitive signal-chain power for VCOs and PLLs.

For engineers reviewing the TPS79101DBVRG4 datasheet, TPS79101DBVRG4 pinout, TPS79101DBVRG4 application, or TPS79101DBVRG4 equivalent, key selection criteria include its adjustable output range (1.22–5.2 V), fast 63 µs start-up time, stability with ≥1 µF ceramic output capacitor, and active-low enable with <0.7 V logic-low threshold.

Technical Context

The TPS79101DBVRG4 uses a proprietary BiCMOS process to achieve ultralow dropout voltage and high PSRR across 100 Hz–100 kHz. Its internal 1.2246 V reference feeds a precision feedback loop via external R1/R2 resistors, enabling programmable output from 1.22 V to 5.2 V.

It integrates UVLO (2.25–2.65 V threshold), thermal shutdown (~165°C trip), and current limiting (~400 mA). The BYPASS pin accepts an external capacitor to form a low-pass filter that reduces output spectral noise density-critical for analog/RF subsystems requiring clean bias rails.

Key Specifications

Pinout & Package

TPS79101DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and thermal performance (R_θJA = 192.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79101DBVRG4, TPS79101DBVRG4 offers proven SOT-23 integration and BYPASS-based noise filtering, while TPS79901DRVR provides superior noise and speed in a thermally enhanced package - choice depends on board space, thermal constraints, and noise budget.

Availability

TPS79101DBVRG4 is available at Aetrix Electronics and suitable for wireless transceiver power, VCO/PLL bias supply, and portable medical sensor node applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for TPS79101DBVRG4 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 expertise and broad automotive/industrial qualification.

The TPS791 family was engineered specifically for RF and precision analog signal chains - prioritizing ultralow noise, high PSRR, and fast transient response over raw current capacity or feature count.

FAQ

What output voltage range does the TPS79101DBVRG4 support?

The TPS79101DBVRG4 supports an adjustable output voltage range from 1.22 V to 5.2 V, set by an external resistor divider connected to the FB pin. Its internal 1.2246 V reference enables precise programming using standard 1% tolerance resistors. This flexibility allows one TPS79101DBVRG4 variant to replace multiple fixed-output LDOs in multi-rail systems.

How does the BYPASS pin function in the TPS79101DBVRG4?

The BYPASS pin on the TPS79101DBVRG4 connects to an external capacitor (0.001–0.1 µF) that forms a low-pass filter with an internal resistor, reducing output spectral noise density. With a 0.1 µF capacitor, TPS79101DBVRG4 achieves 15 µV_RMS integrated noise (100 Hz–100 kHz), making it ideal for powering noise-sensitive RF components like VCOs and PLLs.

What is the minimum input voltage required for the TPS79101DBVRG4 to regulate at 3.3 V output?

For the TPS79101DBVRG4 to regulate at 3.3 V output, the minimum input voltage is determined by dropout voltage plus V_OUT. At 100 mA load, dropout is ≤90 mV (per datasheet), so VIN(min) ≈ 3.3 V + 0.09 V = 3.39 V. However, the absolute minimum operating VIN is 2.7 V - meaning regulation at 3.3 V is only possible when VIN ≥ 3.39 V, per TPS79101DBVRG4 electrical specifications.

Does the TPS79101DBVRG4 require an output capacitor, and what type is recommended?

Yes, the TPS79101DBVRG4 requires a minimum 1 µF ceramic output capacitor for stability, as confirmed in the datasheet's "Stable With Any 1-µF Ceramic Capacitor" feature. X7R or X5R dielectrics are recommended for temperature stability. Larger values (e.g., 10 µF) improve transient response but are not mandatory for basic stability - unlike many older LDOs requiring specific ESR ranges.

What protection features are built into the TPS79101DBVRG4?

The TPS79101DBVRG4 integrates overcurrent limiting (~400 mA), thermal shutdown (~165°C trip), and undervoltage lockout (UVLO with 2.25–2.65 V threshold and 100 mV hysteresis). It also includes reverse-current protection via the PMOS pass transistor's intrinsic body diode. These features ensure robust operation in real-world conditions without external circuitry.