Texas Instruments TPS79913DDCT

Overview

TPS79913DDCT from Texas Instruments is a 200-mA, low-quiescent-current (40 μA), ultralow-noise (10.5 × V_OUT μV_RMS), high-PSRR (66 dB at 1 kHz) low-dropout linear regulator in a 5-pin SOT-23-THIN package delivering a fixed 1.3-V output. It features 100-mV typical dropout at full load, ±2% total output accuracy over line/load/temperature, and stable operation with ≥2-μF ceramic output capacitance. It serves as a precision power source for RF analog circuitry such as VCOs and WLAN front-ends.

For engineers reviewing the TPS79913DDCT datasheet, TPS79913DDCT pinout, TPS79913DDCT application, or TPS79913DDCT equivalent, key selection criteria include its 1.3-V fixed output, 40-μA quiescent current, 100-mV dropout at 200 mA, noise-reduction (NR) pin capability, and compatibility with compact 2.90 mm × 1.60 mm SOT-23-THIN layouts in space-constrained portable systems.

Technical Context

The TPS79913DDCT employs a PMOS pass element with an advanced BiCMOS process to achieve ultralow dropout and high PSRR across wide frequency bands. Its high-gain, high-bandwidth error amplifier enables excellent line and load transient response while maintaining 40-μA ground current - critical for battery-powered RF subsystems.

It integrates inrush current protection triggered by EN toggle activation and overshoot detection that engages a pulldown resistor if V_OUT exceeds nominal by >5%. The NR pin allows external 0.01-μF capacitor bypassing of the internal bandgap reference, reducing output noise to 10.5 × V_OUT μV_RMS (BW = 10 Hz–100 kHz).

Key Specifications

Pinout & Package

The TPS79913DDCT is housed in a 5-pin SOT-23-THIN package (2.90 mm × 1.60 mm, 0.95-mm height), optimized for high-density portable PCBs. Pin 1 is IN; Pin 2 is GND; Pin 3 is EN; Pin 4 is NR; Pin 5 is OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79912DDCT, the TPS79913DDCT provides 83 mV higher output for margin-sensitive analog biasing; compared with TPS7A2013PDQNR, it delivers superior noise suppression via the NR pin but consumes slightly more quiescent current and occupies larger board area.

Availability

TPS79913DDCT is available at Aetrix Electronics and suitable for RF power management, portable wireless connectivity, and precision analog supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS79913DDCT 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 designing analog and embedded processing chips for industrial, automotive, and communications markets.

The TPS799 product line delivers ultralow-noise, high-PSRR LDOs specifically engineered for powering sensitive RF and precision analog circuits in battery-constrained and thermally demanding environments.

FAQ

What is the maximum input voltage rating for the TPS79913DDCT?

The TPS79913DDCT has an absolute maximum input voltage of 7.0 V. However, its recommended operating input range is 2.7 V to 6.5 V. Operation above 6.5 V risks exceeding safe junction temperature or violating absolute maximum ratings, especially under load. For reliable 1.3-V output regulation, minimum input must be ≥1.4 V (1.3 V + 100 mV dropout), and typical use cases operate between 2.7 V and 5.5 V to maintain PSRR and thermal performance. Always observe derating curves in the datasheet for extended temperature operation.

Does the TPS79913DDCT require an external noise-reduction capacitor to achieve its specified output noise?

Yes, the TPS79913DDCT achieves its ultralow 13.65 μV_RMS output noise (10.5 × V_OUT) only when a 0.01-μF ceramic capacitor is connected between the NR pin and ground. Without this capacitor, output noise rises to approximately 94 × V_OUT (122.2 μV_RMS). The NR pin is high-impedance, so low-leakage X7R or COG ceramics are required. This capacitor also improves PSRR at high frequencies and must be placed close to the NR pin per layout guidelines in the datasheet.

Can the TPS79913DDCT be used without connecting the EN pin?

Yes, the TPS79913DDCT can be used with EN tied directly to IN, enabling the device permanently. This configuration draws 40 μA quiescent current continuously and eliminates external control, simplifying designs where always-on operation is acceptable. However, doing so forfeits shutdown capability (which reduces current to 0.15 μA) and inrush current protection triggered by controlled EN toggling. If power sequencing or low-power sleep modes are required, EN must be driven by a microcontroller GPIO or system supervisor.

What output capacitor value and type does the TPS79913DDCT require for stability?

The TPS79913DDCT is stable with a minimum 2.2-μF ceramic output capacitor, and X5R or X7R dielectrics are strongly recommended due to their stable capacitance and low ESR (<1.0 Ω) over temperature. Tantalum or aluminum electrolytic capacitors are not recommended. Larger values (e.g., 10 μF) improve transient response but increase start-up time; the datasheet confirms stability up to at least 10 μF. A 2.2-μF 0603 X7R capacitor placed within 2 mm of the OUT and GND pins satisfies all stability, noise, and thermal requirements for standard applications.

Is the TPS79913DDCT pin-compatible with other members of the TPS799 family in the same SOT-23-THIN package?

Yes, all TPS799 fixed-output variants in the DDC (SOT-23-THIN) package - including TPS79912DDCT, TPS79915DDCT, TPS79918DDCT, and TPS799285DDCT - share identical pinout (IN, GND, EN, NR, OUT), footprint, and thermal characteristics. This enables drop-in voltage scaling across designs without PCB revision. Adjustable versions (e.g., TPS79901DDCT) differ only in pin 4 (FB instead of NR) but retain the same 5-pin layout, allowing reuse of board space with minor schematic changes.