Texas Instruments TPS79901DDCTG4

Overview

TPS79901DDCTG4 from Texas Instruments is a 200-mA, ultra-low-noise, high-PSRR low-dropout linear regulator in a 5-pin SOT-23-THIN package. It delivers fixed 3.0 V output with 2% total accuracy over load, line, and temperature (–40°C to +125°C), 40 μA quiescent current, 100 mV dropout at 200 mA, and 66 dB PSRR at 1 kHz - optimized for RF power supply filtering in portable wireless systems.

For engineers reviewing the TPS79901DDCTG4 datasheet, TPS79901DDCTG4 pinout, TPS79901DDCTG4 application, or TPS79901DDCTG4 equivalent, this page provides verified electrical specifications, validated SOT-23-THIN pin mapping, confirmed noise-reduction capacitor interface behavior, and real-world RF/analog supply use cases - all grounded in TI's SBVS056L production datasheet (Feb 2022).

Technical Context

The TPS79901DDCTG4 uses a PMOS pass element with precision 1.193-V internal reference and high-gain error amplifier to achieve 2% overall output accuracy and 100 mV dropout at full 200-mA load. Its architecture integrates inrush current limiting on EN toggle and active overshoot detection with pulldown resistor engagement above 5% VOUT deviation.

It features dedicated NR pin for external 0.01-μF noise-reduction capacitor, enabling 10.5 × VOUT μVRMS output noise (10 Hz–100 kHz) and improved PSRR across 100 Hz–1 MHz. Stability is guaranteed with ≥2.2-μF ceramic output capacitance (X5R/X7R, ESR < 1 Ω) and no minimum load requirement.

Key Specifications

Pinout & Package

TPS79901DDCTG4 is packaged in a 5-pin SOT-23-THIN (DDC) measuring 2.90 mm × 1.60 mm, with exposed pad not present. This thermally enhanced thin-outline package supports high-density PCB layouts in space-constrained handheld and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79901DBVR, the TPS79901DDCTG4 offers marginally better thermal performance and tighter board area fit; versus MCP1700T-3002E/MB, it delivers 23 dB higher PSRR and 10× lower output noise - essential for RF/analog signal integrity.

Availability

TPS79901DDCTG4 is available at Aetrix Electronics and suitable for base station RF power supplies, smartphone VCO bias rails, and wearable optical sensor AFEs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS79901DDCTG4 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 power management ICs, with decades of LDO design heritage and broad automotive/industrial qualification.

The TPS799 family was engineered for RF and precision analog applications demanding ultralow noise, high PSRR, and sub-100-mV dropout - targeting wireless infrastructure, handheld devices, and sensor signal chains.

FAQ

What is the exact output voltage tolerance of the TPS79901DDCTG4 across temperature and load?

The TPS79901DDCTG4 maintains ±2% output voltage accuracy over the full operating range: –40°C to +125°C junction temperature, 0.5–200 mA load, and input voltage from VOUT+0.3 V up to 6.5 V. This includes contributions from line regulation (0.02%/V), load regulation (0.002%/mA), and reference drift - all verified per TI's SBVS056L datasheet Section 6.5.

Does the TPS79901DDCTG4 require an external noise-reduction capacitor to achieve its specified 31.5 μVRMS output noise?

Yes - the 31.5 μVRMS output noise (10 Hz–100 kHz) is achieved only when a 0.01-μF ceramic capacitor is connected to the NR pin. Without CNR, output noise rises to 94 × VOUT = 282 μVRMS. The NR pin is high-impedance, so low-leakage X7R/X5R ceramics are mandatory for stable low-noise operation.

Can the TPS79901DDCTG4 be used with input voltages below 2.7 V?

No - the absolute minimum input voltage is 2.7 V per Recommended Operating Conditions (Section 6.3). Even though dropout is only 100 mV, the device incorporates undervoltage lockout (UVLO) that disables regulation until VIN exceeds 2.20 V (typical), and full functionality requires VIN ≥ 2.7 V to ensure internal biasing and reference stability.

What is the thermal resistance (RθJA) of the TPS79901DDCTG4 in its SOT-23-THIN package?

The junction-to-ambient thermal resistance (RθJA) for the TPS79901DDCTG4 in the DDC (SOT-23-THIN) package is 225.3°C/W, measured under standard JEDEC JESD51-2 conditions. This value assumes a 2-layer board with 1-in² copper pour; actual thermal performance improves with additional copper area or internal ground planes.

How does the enable (EN) pin behavior differ between active and shutdown states for the TPS79901DDCTG4?

When EN ≥ 1.2 V, the TPS79901DDCTG4 regulates normally with 40 μA ground current. When EN ≤ 0.4 V, it enters shutdown mode with 150 nA (typical) shutdown current and zero output current - verified in Section 6.5 Electrical Characteristics. EN is TTL/CMOS compatible and may be tied to IN if enable control is unnecessary.