Texas Instruments TPS7A1411PYBKR

Overview

TPS7A1411PYBKR from Texas Instruments is a 1-A ultra-low-dropout linear regulator (LDO) designed for low-voltage, high-efficiency power delivery in space-constrained portable electronics. It operates with input voltage as low as 0.7 V, delivers fixed 1.1 V output at ±1% accuracy over –40°C to +125°C, and achieves 70 mV max dropout at 1 A (YBK package). Its dual-rail architecture uses IN (0.7–2.2 V) and BIAS (2.2–5.5 V) supplies to enable stable regulation in LILO (low-input, low-output) systems such as camera sensor rails.

For engineers reviewing the TPS7A1411PYBKR datasheet, TPS7A1411PYBKR pinout, TPS7A1411PYBKR application, or TPS7A1411PYBKR equivalent, this page delivers verified technical context, validated pin functions, real-world load transient performance (±20 mV step response), PSRR (80 dB @ 1 kHz), and design-meaningful alternatives - all specific to the YBK 6-bump WCSP package and 1.1 V fixed-output variant.

Technical Context

The TPS7A1411PYBKR implements a dual-supply LDO architecture: the IN pin carries the main power path (0.7–2.2 V), while the BIAS pin (2.2–5.5 V) powers internal reference and control circuitry - enabling operation when VIN is only 100 mV above VOUT. This decoupling allows high PSRR (80 dB @ 1 kHz, 500 mA load) and ultra-fast load transient response (±20 mV for 3 mA → 600 mA in 20 µs).

It features active output discharge via an internal pulldown resistor (36 Ω), global UVLO with independent thresholds on IN (603 mV typ.) and BIAS (1.42 V typ.), and foldback current limiting (ICL = 1.035–2.45 A, ISC = 600 mA). Thermal shutdown activates at 165°C with 25°C hysteresis, and the device supports SENSE feedback for remote voltage regulation.

Key Specifications

Pinout & Package

TPS7A1411PYBKR is packaged in a 0.71 mm × 1.16 mm, 6-bump wafer-chip-scale package (WCSP, YBK). The package has no exposed thermal pad and requires solder mask-defined pads per TI SZZA032.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1611DRVR and XC6210B112MR-G, the TPS7A1411PYBKR uniquely combines 1 A capacity, 0.71 mm × 1.16 mm WCSP size, active discharge, SENSE feedback, and dual-rail LILO operation - making it irreplaceable in high-density, battery-sensitive designs demanding both ultra-low VIN and precise output regulation.

Availability

TPS7A1411PYBKR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, smart watches, portable medical sensors, and SSD controller rails requiring stable component supply across high-mix, low-volume production and prototyping cycles.

Supply support for TPS7A1411PYBKR 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 focused on analog and embedded processing technologies, with decades of LDO design expertise and broad automotive, industrial, and personal electronics portfolio coverage.

The TPS7A14 family was engineered specifically for ultra-low-input, ultra-low-output battery-powered applications - prioritizing minimal dropout, high PSRR, compact packaging, and intelligent protection features for next-generation wearables and mobile imaging systems.

FAQ

What is the minimum input voltage required for TPS7A1411PYBKR to regulate 1.1 V output?

The TPS7A1411PYBKR requires VIN ≥ VOUT + VDO, where VDO is 70 mV (max) at 1 A and TJ ≤ +85°C. Thus, minimum functional VIN is 1.17 V under full-load, room-temperature conditions. At higher temperatures or lighter loads, VIN may be as low as 1.1 V, but guaranteed regulation starts at 1.17 V per datasheet specifications. The BIAS rail (≥2.2 V) must also be present for proper operation.

Does TPS7A1411PYBKR support remote voltage sensing, and how is it implemented?

Yes, TPS7A1411PYBKR supports remote sensing via the SENSE pin (B1). To implement, connect SENSE directly to the load's VDD point - not to the OUT pin - to compensate for voltage drop across PCB traces. This configuration ensures the regulated 1.1 V is maintained precisely at the load, improving accuracy beyond what OUT-to-load trace resistance would allow. The SENSE pin is internally connected to the error amplifier's feedback node.

What is the purpose of the BIAS pin on TPS7A1411PYBKR, and what happens if it's unconnected?

The BIAS pin (C2) supplies power to the internal reference, error amplifier, and control circuitry - enabling the TPS7A1411PYBKR to operate with VIN as low as 0.7 V. If left unconnected or below 2.2 V, the device remains disabled due to BIAS UVLO (1.42 V typical). Connecting BIAS to a stable 2.2–5.5 V source (e.g., battery or auxiliary rail) is mandatory for regulation; it does not carry output current and draws only 12–17 µA in normal operation.

How does the active discharge function work on TPS7A1411PYBKR, and what is its typical discharge time?

The TPS7A1411PYBKR integrates a 36 Ω pulldown resistor activated when EN is low, IN or BIAS falls below UVLO, or thermal shutdown triggers. Discharge time depends on COUT and parallel load resistance: for example, with 10 µF COUT and no load, t ≈ 0.35 × R × C = 126 µs. With 100 kΩ load, discharge slows significantly. The feature ensures predictable power-down sequencing without external components, critical for system-level reset integrity.

Can TPS7A1411PYBKR be used without the EN pin, and what is the recommended connection?

Yes, the EN pin (B2) can be omitted from active control. For always-on operation, connect EN directly to either the IN pin or the BIAS pin - both provide valid logic-high voltage (>0.6 V) to enable regulation. Do not leave EN floating, as leakage or noise could cause unintended disable. TI confirms this connection method in Section 5.1 of the datasheet and guarantees full functionality with EN tied high.