Texas Instruments TPS7A1118PYKAR

Overview

TPS7A1118PYKAR from Texas Instruments is a 500-mA, ultra-low dropout linear regulator (LDO) with dual-input architecture (IN and BIAS pins), fixed 1.8-V output, 0.75-V minimum input voltage, 110-mV maximum dropout at 500 mA (YKA package), and 1.5% total output accuracy over load, line, and temperature. It powers core rails in space-constrained, battery-operated devices such as camera modules and wireless earbuds.

For engineers reviewing the TPS7A1118PYKAR datasheet, TPS7A1118PYKAR pinout, TPS7A1118PYKAR application, or TPS7A1118PYKAR equivalent, key selection criteria include ultra-low VIN capability (down to 0.75 V), bias-rail efficiency optimization, active output discharge, thermal shutdown behavior, and DSBGA-5 footprint compatibility with sub-1-mm² board area.

Technical Context

The TPS7A1118PYKAR implements a dual-supply LDO architecture: 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 140 mV above VOUT. This decoupling allows operation with pre-regulated DC/DC outputs or partially discharged batteries.

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 typical), thermal shutdown (160°C), and an active pulldown circuit (120 Ω) for controlled output discharge during disable or fault conditions.

Key Specifications

Pinout & Package

TPS7A1118PYKAR uses the YKA package: 5-pin, 0.74-mm × 1.09-mm DSBGA with 0.35-mm ball pitch. Thermal performance relies on solder joint conduction; no exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and ADP125ARHZ-1.8-R7, the TPS7A1118PYKAR uniquely supports ultra-low VIN (0.75 V) via its BIAS pin, delivers identical 500-mA capability in a 75% smaller footprint than TSOT-5, and provides active discharge for deterministic power-down-making it irreplaceable in next-gen wearables and compact imaging systems.

Availability

TPS7A1118PYKAR is available at Aetrix Electronics and suitable for smart watches, wireless earbuds, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceability for Class II medical and consumer electronics programs.

Supply support for TPS7A1118PYKAR 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 connectivity technologies, with decades of LDO design expertise and broad automotive, industrial, and personal electronics qualification.

The TPS7A11 family was engineered specifically for ultra-low-voltage, ultra-low-power battery-operated systems-enabling reliable 0.5–3.0-V core regulation where traditional LDOs fail due to insufficient input headroom or excessive quiescent loss.

FAQ

What is the minimum input voltage required for TPS7A1118PYKAR to regulate 1.8 V?

The TPS7A1118PYKAR requires a minimum input voltage of 0.75 V on the IN pin, but stable regulation at 1.8 V demands VIN ≥ VOUT + VDO. With a maximum dropout of 110 mV at 500 mA (YKA package), the practical minimum VIN is 1.91 V. However, the BIAS pin (1.7–5.5 V) powers internal circuitry, allowing IN to operate as low as 0.75 V when paired with a pre-regulated source-so VIN can be just 140 mV above VOUT if BIAS is properly supplied. The TPS7A1118PYKAR thus achieves true LILO operation unattainable with conventional single-rail LDOs.

Does TPS7A1118PYKAR include active output discharge, and how does it function?

Yes, the TPS7A1118PYKAR includes an active output discharge circuit-available only in the P-version (denoted by "P" in the suffix, confirmed for TPS7A1118PYKAR). When the EN pin is driven low or thermal shutdown activates, an internal 120-Ω pulldown resistor connects OUT to GND. Discharge time depends on output capacitance (COUT) and parallel load resistance (RL), calculated as t = 120·RL/(120 + RL)·COUT. This ensures rapid, controlled VOUT collapse-critical for safe power sequencing in multi-rail systems. The TPS7A1118PYKAR's active discharge eliminates reliance on external bleed resistors, saving board space and power.

What are the absolute maximum ratings for the BIAS and IN pins of TPS7A1118PYKAR?

The absolute maximum voltage rating for both the BIAS and IN pins of the TPS7A1118PYKAR is –0.3 V to 6.0 V. Exceeding these limits-even momentarily-may cause permanent damage. The output pin (OUT) has a more restrictive absolute maximum: –0.3 V to (VIN + 0.3 V), capped at 3.6 V. These ratings are defined in Section 6.1 of the official datasheet (SBVS316B). For reliable operation, the recommended ranges are narrower: IN = 0.75–3.3 V, BIAS = 1.7–5.5 V, and VOUT = 1.8 V (fixed). Always observe derating guidelines and ensure proper decoupling to avoid voltage overshoot during hot-plug or load transients. The TPS7A1118PYKAR's robust UVLO and thermal protection help mitigate risk, but staying within recommended conditions is essential for long-term reliability.

How does the dual-rail architecture (IN + BIAS) improve efficiency in battery-powered designs using TPS7A1118PYKAR?

The dual-rail architecture of the TPS7A1118PYKAR separates power delivery (IN) from control circuitry supply (BIAS), enabling two distinct efficiency gains: First, IN can be sourced from a highly efficient, low-headroom DC/DC converter (e.g., buck output at 1.91 V), minimizing conduction loss across the pass element. Second, BIAS can be fed directly from a higher-voltage, less-depleted battery rail (e.g., 3.6 V Li-ion), ensuring stable internal biasing without forcing the IN rail to operate at elevated voltages. This decoupling reduces total system IQ-TI specifies 1.6 µA on IN and 6 µA on BIAS-extending battery life in always-on monitoring modes. In real-world use, this architecture allows the TPS7A1118PYKAR to sustain 1.8-V regulation longer than single-rail LDOs when battery voltage drops below 2.0 V, a key advantage in TPS7A1118PYKAR-based wearables and hearing aids.

Is TPS7A1118PYKAR pin-compatible with other members of the TPS7A11 family, such as the DRV-packaged variants?

No, the TPS7A1118PYKAR is not pin-compatible with DRV-packaged TPS7A11 variants (e.g., TPS7A1118PDRVR). The TPS7A1118PYKAR uses a 5-pin DSBGA (YKA) package with pinout A1(IN), A3(OUT), B2(GND), C1(BIAS), C3(EN), while the DRV variant uses a 6-pin WSON package with pinout IN(6), OUT(1), GND(5), BIAS(4), EN(3), NC(2). The DSBGA lacks the NC pin and reassigns ball positions-making direct PCB substitution impossible without layout revision. Additionally, thermal characteristics differ significantly: YKA has RθJA = 169.4°C/W vs. DRV's 77.3°C/W, requiring distinct thermal pad strategies. Therefore, the TPS7A1118PYKAR must be treated as a mechanically and thermally distinct variant-not a drop-in replacement-for DRV versions.