Texas Instruments TPS79147DBVRQ1

Overview

TPS79147DBVRQ1 from Texas Instruments is an automotive-grade 4.7-V fixed-output, 100-mA low-dropout (LDO) linear regulator in a 5-pin SOT-23 (DBV) package. It delivers ultralow noise (15 µVRMS), high PSRR (70 dB at 10 kHz), fast start-up (63 µs), and stable operation with any 1-µF ceramic output capacitor - ideal for powering noise-sensitive RF circuits such as Bluetooth and wireless LAN transceivers.

For engineers reviewing the TPS79147DBVRQ1 datasheet, TPS79147DBVRQ1 pinout, TPS79147DBVRQ1 application, or TPS79147DBVRQ1 equivalent, key selection considerations include dropout voltage (38 mV at 100 mA), standby current (<1 µA), EN logic polarity (active-low), and automotive temperature range (−40°C to 125°C).

Technical Context

The TPS79147DBVRQ1 uses a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current protection via an integrated back diode. Its internal 250-kΩ resistor and BYPASS pin form a programmable RC filter to suppress reference noise - critical for achieving 15 µVRMS output noise with a 0.1-µF bypass capacitor.

It integrates UVLO (2.25 V threshold), thermal shutdown, and current limiting (~400 mA). The EN pin enables active-low control with <1 µA quiescent current in shutdown, while line/load transient response is optimized for battery-powered RF systems requiring rapid regulation recovery under dynamic load steps.

Key Specifications

Pinout & Package

TPS79147DBVRQ1 is housed in a RoHS-compliant, lead-free 5-pin SOT-23 (DBV) package (3.0 × 1.75 × 1.45 mm), qualified per AEC-Q100 for automotive use. Pin 1 is marked by a dot; device orientation follows JEDEC MO-178 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79147DBVRQ1, TPS79147DBVR lacks automotive qualification and thermal robustness, while TPS799475DBVRQ1 trades noise performance for lower quiescent current - making TPS79147DBVRQ1 the optimal choice for noise-critical automotive RF rails.

Availability

TPS79147DBVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS radar modules, and telematics systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS79147DBVRQ1 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 high-reliability power management solutions.

The TPS791-Q1 family was designed specifically for automotive noise-sensitive analog subsystems - delivering ultralow noise, fast transient response, and AEC-Q100 qualification in compact SOT-23 packages.

FAQ

What is the minimum input voltage required for TPS79147DBVRQ1 to regulate 4.7 V at 100 mA?

The minimum input voltage is calculated as VO + VDO = 4.7 V + 0.038 V = 4.738 V at TJ = 25°C. Per datasheet Section 4, VI(min) must also meet 2.7 V or VO + 1 V - whichever is greater - so 5.7 V is the absolute minimum for full-spec operation. However, at 4.738 V input, TPS79147DBVRQ1 maintains regulation with 38 mV dropout, confirmed in Electrical Characteristics Table (Dropout Voltage row, TPS79147, IO = 100 mA, TJ = 25°C).

Does TPS79147DBVRQ1 require an external feedback resistor network?

No. TPS79147DBVRQ1 is a fixed-output 4.7-V variant and does not use the FB pin. The FB terminal is absent in its 5-pin DBV package configuration - only the adjustable TPS79101DBVRQ1 (6-pin) requires external resistors. Pinout documentation confirms FB is N/A for fixed versions, and the functional block diagram for fixed devices omits the feedback divider entirely.

Can TPS79147DBVRQ1 operate with a 0.47-µF ceramic output capacitor?

Yes - the TPS79147DBVRQ1 is stable with a 0.47-µF ceramic output capacitor provided it has ≥75 mΩ ESR, as specified in Figure 29 (Typical Regions of Stability). However, the datasheet recommends ≥1 µF for guaranteed stability across all conditions, especially at temperature extremes and high load currents. Using 0.47 µF may marginally reduce transient response margin.

What is the purpose of the BYPASS pin on TPS79147DBVRQ1, and what capacitor value is recommended?

The BYPASS pin connects to the internal voltage reference through a 250-kΩ resistor, forming an RC low-pass filter that reduces reference noise. A 0.1-µF ceramic capacitor is recommended to achieve 15 µVRMS output noise (per Typical Characteristics Figure 6 and Application Information section). Larger values slow start-up due to increased RC time constant but further reduce noise; smaller values degrade noise performance.

Is TPS79147DBVRQ1 pin-compatible with other members of the TPS791xx-Q1 family?

TPS79147DBVRQ1 shares the same 5-pin SOT-23 (DBV) footprint with TPS79118DBVRQ1 and TPS79133DBVRQ1, but pin functions differ for the adjustable TPS79101DBVRQ1 (6-pin DBV). All fixed-output variants (1.8 V, 3.3 V, 4.7 V) use identical pinout: IN, GND, EN, OUT, BYPASS. No PCB redesign is needed when substituting between fixed-output voltages within the same package.