Texas Instruments TPS7A10105PYKAR

Overview

TPS7A10105PYKAR from Texas Instruments is a 300-mA, ultra-low-dropout linear regulator (LDO) with dual-supply architecture (VIN + VBIAS), fixed 1.05-V output, 0.75-V minimum input voltage, 70-mV max dropout at 300 mA (YKA package), and ±1.5% output accuracy over –40°C to +125°C. It powers core rails in space-constrained, battery-operated devices such as smart wearables and camera modules.

For engineers reviewing the TPS7A10105PYKAR datasheet, TPS7A10105PYKAR pinout, TPS7A10105PYKAR application, or TPS7A10105PYKAR equivalent, key selection considerations include its dual-rail bias architecture, sub-1-V input capability, active output discharge (P-version), 1.6-µA VIN quiescent current, and 0.74-mm × 1.09-mm DSBGA-5 (YKA) package.

Technical Context

The TPS7A10105PYKAR uses a dedicated BIAS rail (1.7–5.5 V) to power internal circuitry while VIN supplies the output path-enabling stable regulation even when VIN is as low as 70 mV above VOUT. This architecture decouples control-loop power from the main power path, preserving ultra-low dropout and high PSRR (60 dB @ 1 kHz).

It integrates global UVLO with independent thresholds on VIN (675 mV rising) and VBIAS (1.54 V rising), thermal shutdown (160°C), and monotonic soft-start. The P-version includes an active pulldown circuit (120-Ω resistor) for controlled output discharge upon disable or thermal fault.

Key Specifications

Pinout & Package

TPS7A10105PYKAR is packaged in a 0.74-mm × 1.09-mm, 0.35-mm pitch, 5-pin DSBGA (YKA) package optimized for ultra-compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A10105PDSE, the TPS7A10105PYKAR offers superior board-area efficiency and lower thermal resistance to board (RθJB = 55.4°C/W), while TPS7A05105YKAR trades dual-supply capability for lower cost and simpler layout-making it viable only when ultra-low VIN operation is unnecessary.

Availability

TPS7A10105PYKAR is available at Aetrix Electronics and suitable for smart wearables, camera modules, and wireless earbuds requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS7A10105PYKAR 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 delivering analog, embedded processing, and connectivity solutions with broad industrial, automotive, and consumer reach.

The TPS7A10 family is designed specifically for ultra-low-voltage, ultra-low-power portable electronics-emphasizing sub-1-V input operation, dual-supply efficiency, and miniature packaging for next-generation wearables and IoT edge nodes.

FAQ

What is the minimum input voltage required for TPS7A10105PYKAR to regulate at 1.05 V?

The TPS7A10105PYKAR requires a minimum VIN of 0.75 V, but stable regulation at full 300-mA load demands VIN ≥ VOUT + VDO. With a maximum dropout of 70 mV at 300 mA, VIN must be ≥ 1.12 V for guaranteed operation. Below that, output current capability decreases progressively per the dropout vs. IOUT curve in the datasheet.

Does TPS7A10105PYKAR require external capacitors, and what values are recommended?

Yes, TPS7A10105PYKAR requires three external ceramic capacitors: CIN ≥ 2.2 µF (X5R/X7R, placed near IN), CBIAS ≥ 0.1 µF (placed near BIAS), and COUT = 2.2–22 µF (X5R/X7R, placed near OUT). These ensure stability, transient response, and PSRR performance-values outside this range may degrade regulation or cause oscillation.

How does the BIAS pin function in TPS7A10105PYKAR, and why is it necessary?

The BIAS pin powers the internal control circuitry independently of VIN, allowing the TPS7A10105PYKAR to operate with VIN as low as 0.75 V-even below the bandgap reference voltage. This separates regulation accuracy and PSRR from VIN headroom constraints, enabling efficient use of low-VIN sources like buck converters or partially discharged batteries.

Is active output discharge supported on TPS7A10105PYKAR, and how does it work?

Yes-TPS7A10105PYKAR is the "P" version and includes active output discharge. When EN is pulled low or thermal shutdown activates, an internal 120-Ω pulldown resistor connects OUT to GND, discharging COUT with a time constant τ ≈ 120·RL·COUT/(120 + RL). This ensures predictable, rapid VOUT decay without external components.

What are the UVLO thresholds for VIN and VBIAS on TPS7A10105PYKAR?

TPS7A10105PYKAR features independent UVLO: VIN rising threshold is 675 mV (±30 mV), falling threshold is 600 mV (±35 mV); VBIAS rising threshold is 1.54 V (±90 mV), falling threshold is 1.44 V (±90 mV). Both must exceed their rising thresholds before regulation begins-preventing partial startup during brownout conditions.