Texas Instruments TPS79101DBVRQ1

Overview

TPS79101DBVRQ1 from Texas Instruments is an automotive-grade adjustable low-dropout (LDO) linear voltage regulator in a 6-pin SOT-23 package, delivering up to 100 mA output current with 38 mV dropout at full load, 15 µV_RMS output noise, and 70 dB PSRR at 10 kHz - designed for powering noise-sensitive RF analog circuits in automotive infotainment and telematics systems.

For engineers reviewing the TPS79101DBVRQ1 datasheet, TPS79101DBVRQ1 pinout, TPS79101DBVRQ1 application, or TPS79101DBVRQ1 equivalent, key selection criteria include its adjustable output (1.22 V to 5.2 V), EN-controlled shutdown (<1 µA standby current), BYPASS pin for noise filtering, stability with ≥1 µF ceramic output capacitor, and AEC-Q100 qualification for −40°C to 125°C operation.

Technical Context

The TPS79101DBVRQ1 implements a PMOS pass transistor architecture with internal bandgap reference, UVLO (2.25–2.65 V), thermal shutdown, and current limiting (~400 mA). Its feedback loop uses an external resistor divider on the FB pin to set output voltage, with internal 250 kΩ resistor on the BYPASS pin enabling RC-based noise suppression.

It achieves fast start-up (63 µs with 0.001 µF bypass capacitor) and maintains ultralow noise performance via dedicated bypass filtering, while supporting stable operation across input voltages from 2.7 V to 5.5 V and output loads from 0 to 100 mA - all within automotive ambient temperature limits.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.9 mm × 1.6 mm × 1.45 mm body, 0.95 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79133DBVRQ1, the TPS79101DBVRQ1 trades pin count and simplicity for output voltage flexibility and FB-based precision trimming; versus TLV70733PDQNR, it delivers superior noise/PSRR and full automotive qualification at the expense of current capability.

Availability

TPS79101DBVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, RF telematics, and body control units requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for TPS79101DBVRQ1 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 automotive electronics, with decades of expertise in power management IC design and automotive qualification.

The TPS791-Q1 product line delivers high-performance, low-noise LDO regulators engineered specifically for automotive applications demanding robustness, precision, and ultra-low interference in RF and analog signal chains.

FAQ

What is the minimum input voltage required for TPS79101DBVRQ1 to regulate a 3.3 V output?

The minimum input voltage for TPS79101DBVRQ1 to regulate 3.3 V is VO + V_DO(max), where V_DO(max) is 90 mV at 100 mA per datasheet. Thus, VI(min) = 3.3 V + 0.09 V = 3.39 V. At lighter loads, dropout decreases - e.g., 50 mV at 10 mA yields VI(min) = 3.35 V. The device also enforces a hard minimum of 2.7 V regardless of output setting.

Can TPS79101DBVRQ1 operate with a 0.47 µF output capacitor?

Yes - TPS79101DBVRQ1 is stable with a 0.47 µF ceramic output capacitor provided it has ≥75 mΩ ESR. However, the datasheet recommends ≥1 µF for guaranteed stability across all conditions and temperatures. Using 0.47 µF may reduce phase margin marginally and is only validated for specific ESR ranges; 1 µF ceramic remains the robust default choice.

How does the BYPASS pin on TPS79101DBVRQ1 reduce output noise?

The BYPASS pin connects internally to the bandgap reference through a 250 kΩ resistor. An external capacitor (e.g., 0.1 µF) forms an RC low-pass filter that attenuates reference voltage noise before it modulates the output. This reduces integrated output noise from ~32 µV_RMS (no bypass) to 15 µV_RMS, directly improving RF signal integrity in TPS79101DBVRQ1 applications.

Is TPS79101DBVRQ1 pin-compatible with other TPS791-Q1 variants?

No - TPS79101DBVRQ1 uses a 6-pin SOT-23 (DBV) package with pins IN, GND, EN, BYPASS, FB, and OUT. Fixed-output variants like TPS79133DBVRQ1 use a 5-pin DBV package (IN, GND, EN, OUT, BYPASS) and omit the FB pin. PCB layout and footprint must be redesigned to accommodate the extra FB pin and different pinout.

What is the maximum junction temperature limit for continuous operation of TPS79101DBVRQ1?

The maximum recommended junction temperature for continuous operation of TPS79101DBVRQ1 is 125°C. While absolute maximum rating is 150°C, sustained operation above 125°C risks thermal shutdown activation and accelerated parametric drift. Thermal design must ensure PD ≤ (125°C − TA)/R_θJA, where R_θJA = 256°C/W (low-K board) or 178.3°C/W (high-K board).