Texas Instruments TPS7A1128PYKAR

Overview

TPS7A1128PYKAR from Texas Instruments is a 500-mA, ultra-low dropout linear regulator (LDO) with dual-input architecture (IN + BIAS), supporting input voltages as low as 0.75 V and output voltages down to 0.5 V. It delivers 1.5% output accuracy over load, line, and temperature (–40°C to +125°C), features 110 mV max dropout at 500 mA in the YKA package, and draws only 1.6 µA typical quiescent current on the IN pin-enabling high-efficiency power delivery to core rails of wearables and ultra-low-power MCUs.

For engineers reviewing the TPS7A1128PYKAR datasheet, TPS7A1128PYKAR pinout, TPS7A1128PYKAR application, or TPS7A1128PYKAR equivalent, key selection criteria include its LILO (low-input/low-output) capability, bias-rail–enabled operation below 1 V, active output discharge, and compatibility with space-constrained DSBGA packaging for battery-powered edge devices.

Technical Context

The TPS7A1128PYKAR implements a dual-supply LDO architecture where the IN pin supplies power to the pass element while the BIAS pin powers internal control circuitry-enabling stable regulation even when VIN is only 110 mV above VOUT. Its global UVLO combines independent rising/falling thresholds on both IN (675 mV rise, 600 mV fall) and BIAS (1.54 V rise, 1.44 V fall) to ensure robust startup and shutdown sequencing.

It integrates foldback current limiting (920 mA typ. for YKA), thermal shutdown (160°C trip), and an active pulldown circuit (120 Ω) for controlled output discharge during disable. The device achieves 64 dB PSRR at 1 kHz and 93.9 µV_RMS output noise (10 Hz–100 kHz) with 2.2 µF C_OUT, optimized for analog-sensitive loads like image sensors and RF front-ends.

Key Specifications

Pinout & Package

TPS7A1128PYKAR is housed in a 0.74-mm × 1.09-mm, 5-pin DSBGA (YKA) package with 0.35-mm pitch and bottom-side ball layout. Thermal performance is enhanced via direct PCB copper exposure under the die area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1128PYKAR, the TPS7A1125PYKAR offers identical form-factor and efficiency for 2.5 V systems, while the TPS7A0528PDQNR trades ultra-low dropout and dual-rail flexibility for simplified single-supply operation and wider package availability-making it viable only where 250 mV dropout and 0.8 µA higher I_Q are acceptable.

Availability

TPS7A1128PYKAR 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 traceability.

Supply support for TPS7A1128PYKAR 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 and embedded processing technologies, with decades of LDO design expertise and broad automotive, industrial, and consumer qualification.

The TPS7A11 family was engineered specifically for ultra-low-power, space-constrained battery-operated devices-delivering LILO regulation, nanoscale packaging, and precision voltage accuracy where every millivolt and micron matters.

FAQ

What is the minimum input voltage required for TPS7A1128PYKAR to regulate 2.8 V output?

The TPS7A1128PYKAR requires a minimum input voltage of 2.91 V (2.8 V + 110 mV dropout) on the IN pin when delivering 500 mA. However, because it uses a separate BIAS rail (1.7–5.5 V), the IN pin can be supplied as low as 0.75 V-provided the BIAS rail remains active. For full regulation at rated current, VIN must exceed VOUT by the specified dropout voltage under load and temperature.

Does TPS7A1128PYKAR support active output discharge, and how does it work?

Yes, TPS7A1128PYKAR includes an active discharge circuit that engages when the EN pin is driven low or during thermal shutdown. An internal 120-Ω pulldown resistor connects the OUT pin to GND, discharging external capacitance. For example, with 2.2 µF C_OUT and no load, discharge time is ~264 µs. This ensures predictable power-down behavior critical for system reset integrity.

Can TPS7A1128PYKAR operate without the BIAS pin connected?

No-TPS7A1128PYKAR requires a valid BIAS supply (1.7–5.5 V) to power internal control circuitry. Leaving BIAS unconnected or below 1.46 V (UVLO threshold) disables regulation regardless of IN voltage. The BIAS rail must be present before or simultaneously with IN to ensure proper startup; TI recommends connecting BIAS to a stable system rail such as a 3.3 V LDO or battery monitor output.

What is the thermal performance of TPS7A1128PYKAR in its YKA package?

In the 0.74-mm × 1.09-mm DSBGA (YKA) package, TPS7A1128PYKAR has a junction-to-board thermal resistance (R_θJB) of 55.4°C/W and junction-to-ambient (R_θJA) of 169.4°C/W under standard JEDEC PCB conditions. With 200 mm² of 1-oz copper under the thermal pad, power dissipation up to 350 mW is sustainable at +85°C ambient-sufficient for 500 mA at 110 mV dropout (55 mW) with ample margin.

How does the global UVLO function in TPS7A1128PYKAR?

The TPS7A1128PYKAR implements two independent UVLO comparators-one on IN (675 mV rise, 600 mV fall) and one on BIAS (1.54 V rise, 1.44 V fall)-combined via internal AND logic. Regulation only begins when both rails exceed their rising thresholds; either rail falling below its respective threshold disables the output. This prevents partial operation during power sequencing or brownout events.