Texas Instruments TPS7A1105PYKAR

Overview

TPS7A1105PYKAR from Texas Instruments is a 500-mA ultra-low dropout LDO regulator with dual-rail input architecture (IN + BIAS), supporting 0.5 V to 3.0 V fixed output in 50-mV steps, 1.5% accuracy over load/line/temperature, 110 mV max dropout at 500 mA (YKA package), and 1.6 µA typical IN quiescent current. It powers core rails of ultra-low-voltage MCUs and analog sensors in space-constrained portable electronics.

For engineers reviewing the TPS7A1105PYKAR datasheet, TPS7A1105PYKAR pinout, TPS7A1105PYKAR application, or TPS7A1105PYKAR equivalent, key selection criteria include LILO (low-input/low-output) operation capability, BIAS-supplied internal circuitry enabling sub-0.75 V effective VIN, active output discharge timing control, and DSBGA-5 thermal performance under 125°C junction conditions.

Technical Context

The TPS7A1105PYKAR implements a dual-supply LDO architecture where the IN pin delivers power to the pass element while the BIAS pin independently powers internal control circuitry - enabling stable regulation even when VIN is as low as 0.75 V (e.g., 0.5 V output + 0.25 V headroom). This decoupling allows operation with VIN < VBIAS and supports battery-backed bias supplies.

It features global UVLO with independent rising/falling thresholds on both IN (675 mV / 600 mV) and BIAS (1.54 V / 1.44 V), foldback current limiting (920 mA typ), thermal shutdown (160°C), and active pulldown via 120-Ω switch for controlled output discharge during disable - all integrated in a 0.74 mm × 1.09 mm, 5-ball DSBGA package with 0.35-mm pitch.

Key Specifications

Pinout & Package

TPS7A1105PYKAR is housed in a 0.74-mm × 1.09-mm, 5-ball DSBGA (YKA) package with 0.35-mm pitch and bottom-side solder connections. Thermal performance is optimized via direct PCB copper exposure under the die pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1105DRVR, the TPS7A1105PYKAR offers 2.3× smaller footprint and superior thermal resistance to board (RθJB = 55.4°C/W), making it essential for miniaturized wearables; versus TPS7A0505PDBVR, its dual-rail architecture uniquely supports true LILO operation - enabling 0.5 V output from 0.75 V input where single-rail LDOs fail.

Availability

TPS7A1105PYKAR is available at Aetrix Electronics and suitable for smart wearables, wireless audio devices, and portable medical sensors requiring stable component supply with guaranteed long-term manufacturability and full TI production data status.

Supply support for TPS7A1105PYKAR 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 expertise and broad automotive, industrial, and consumer qualification.

The TPS7A11 family was engineered specifically for ultra-low-voltage, ultra-low-power portable applications - delivering LILO regulation, sub-2 µA quiescent current, and DSBGA packaging to meet aggressive size and efficiency targets in next-generation wearables and IoT edge nodes.

FAQ

What is the minimum input voltage required for TPS7A1105PYKAR to regulate 0.5 V output?

The TPS7A1105PYKAR requires a minimum 0.75 V on the IN pin to regulate 0.5 V output, enabled by its dual-rail architecture where the BIAS pin (supplied ≥1.7 V) powers internal circuitry independently. This LILO capability allows operation with only 250 mV headroom - significantly lower than conventional LDOs needing ≥300 mV dropout plus control overhead.

Does TPS7A1105PYKAR support active output discharge, and how is it implemented?

Yes, TPS7A1105PYKAR includes active output discharge via an internal 120-Ω pulldown switch activated when EN is driven low or during thermal shutdown. Discharge time depends on COUT and parallel load resistance per t = 120·RL/(120+RL)·COUT. The feature ensures deterministic power-down sequencing in multi-rail systems without external components.

Can TPS7A1105PYKAR be used without connecting the BIAS pin?

No - the BIAS pin must be connected to a 1.7–5.5 V supply. It powers the internal bandgap reference, error amplifier, and UVLO comparators. Leaving BIAS unconnected prevents regulation, as the control circuitry lacks biasing. If only one supply is available, connect both IN and BIAS to that rail - provided it meets both voltage ranges.

What is the thermal performance difference between TPS7A1105PYKAR (YKA) and TPS7A1105DRVR (DRV)?

TPS7A1105PYKAR in YKA package has RθJB = 55.4°C/W and RθJA = 169.4°C/W, while TPS7A1105DRVR in DRV package has RθJB = 41.1°C/W and RθJA = 77.3°C/W. Though DRV offers better junction-to-board conduction, YKA's ultra-small size limits copper area - making it more sensitive to layout. Both require proper thermal vias and ground plane coupling for rated 500 mA operation at 125°C TJ.

How does the global UVLO function in TPS7A1105PYKAR, and what are its thresholds?

TPS7A1105PYKAR uses two independent UVLO comparators - one on IN (rising threshold 675 mV, hysteresis 75 mV) and one on BIAS (rising threshold 1.54 V, hysteresis 80 mV). Their outputs feed an AND gate; regulation only enables when both rails exceed their respective rising thresholds. This prevents partial turn-on and ensures robust startup in battery-powered systems with asymmetric rail ramp rates.