Texas Instruments TPS7A1309PYCKR

Overview

TPS7A1309PYCKR from Texas Instruments is a 300-mA ultra-low-dropout (ULDO) linear regulator optimized for battery-powered systems with sub-1-V logic rails. It operates from 0.7 V to 2.2 V input, delivers fixed 0.9 V output with ±1% accuracy over load/line/temperature, and achieves only 65 mV dropout at 300 mA - enabling use with DC/DC pre-regulators in space-constrained wearables and mobile SoC power domains.

For engineers reviewing the TPS7A1309PYCKR datasheet, TPS7A1309PYCKR pinout, TPS7A1309PYCKR application, or TPS7A1309PYCKR equivalent, this page provides verified functional context, validated pin-level design meaning, confirmed transient response metrics (20 mV load step), real-world thermal derating guidance (R_θJA = 148.5°C/W), and direct alternative part comparisons for low-voltage LDO selection.

Technical Context

The TPS7A1309PYCKR employs a dual-rail architecture: the IN pin supplies the main power path (down to V_OUT + 50 mV), while the BIAS pin (2.2–5.5 V) independently powers internal reference and control circuitry - decoupling efficiency from input voltage headroom. This enables stable regulation even when VIN is as low as 0.7 V.

It integrates global UVLO (IN and BIAS monitored via AND logic), active output discharge (RPULLDOWN = 36 Ω), foldback current limiting (ICL = 320–750 mA, ISC = 177 mA), and thermal shutdown (TSD = 165°C with 25°C hysteresis). Its high PSRR (80 dB @ 1 kHz) and low 7.2 µV_RMS noise support noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

TPS7A1309PYCKR uses a 6-pin, 0.35-mm pitch DSBGA (YCK) package measuring 0.71 mm × 1.0 mm. The bump layout is top-view with A1–C2 grid orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1309PYCKR, the TPS7A1310PYCKR offers identical performance at 1.0 V - ideal for voltage-scaling flexibility - while the NCP163AMX090TBG lacks BIAS support and larger footprint, limiting its use in next-gen ultra-low-voltage portable designs.

Availability

TPS7A1309PYCKR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, and smart watches requiring stable component supply, tight voltage tolerance, and ultra-small packaging for high-density PCB layouts.

Supply support for TPS7A1309PYCKR 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 technologies, with decades of LDO innovation for portable and industrial applications.

The TPS7A13 family was designed specifically for ultra-low-voltage, high-efficiency point-of-load regulation in battery-powered consumer electronics - addressing the demand for sub-1-V core rails with minimal dropout and exceptional transient immunity.

FAQ

What is the minimum input voltage required for TPS7A1309PYCKR to regulate 0.9 V output?

The TPS7A1309PYCKR requires a minimum input voltage of 0.7 V on the IN pin, but full regulation at 0.9 V is guaranteed only when VIN ≥ VOUT + 100 mV (i.e., ≥1.0 V) and VBIAS ≥ VOUT + 1.4 V (i.e., ≥2.3 V). Below 1.0 V VIN, the device enters dropout mode and output tracks input.

Can TPS7A1309PYCKR operate without an external BIAS supply?

No - the TPS7A1309PYCKR requires a valid BIAS voltage between 2.2 V and 5.5 V to power its internal reference and control circuitry. If no separate BIAS rail exists, a local LDO or charge pump generating ≥2.2 V from system VCC is necessary; the device will not regulate with BIAS unconnected or below UVLO threshold.

How does the SENSE pin improve regulation accuracy in TPS7A1309PYCKR?

The SENSE pin on TPS7A1309PYCKR provides remote feedback by connecting directly to the load's power input node. This compensates for voltage drop across PCB traces between the OUT pin and load, maintaining ±1% output accuracy at the point-of-load - critical for high-current, low-voltage digital cores where even 10 mΩ trace resistance causes significant error.

What is the purpose of the active discharge function in TPS7A1309PYCKR?

The active discharge function in TPS7A1309PYCKR uses an internal 36-Ω pulldown resistor activated when EN is low, during UVLO, or at thermal shutdown. It rapidly discharges the output capacitor to 0 V, preventing unintended wake-up of downstream circuits and ensuring deterministic power-down sequencing in multi-rail systems.

Is TPS7A1309PYCKR compatible with ceramic output capacitors smaller than 1 µF?

No - the TPS7A1309PYCKR requires a minimum 1-µF ceramic capacitor from OUT to GND for stability, as specified in the datasheet. Using smaller values risks oscillation or poor transient response. For best performance, TI recommends ≥2.2 µF X7R/X5R ceramic capacitors placed adjacent to the OUT pin.