Texas Instruments TPS7A1011PDSER

Overview

TPS7A1011PDSER from Texas Instruments is a 300-mA, ultra-low-dropout linear regulator (LDO) with dual-rail architecture (VIN + VBIAS), supporting input as low as 0.75 V and output down to 0.5 V. It delivers ±1.5% output accuracy over –40°C to +125°C, 70 mV max dropout at 300 mA (YKA package), and 1.6 µA typical VIN quiescent current - optimized for powering ultra-low-voltage cores in battery-constrained wearables and sensor nodes.

For engineers reviewing the TPS7A1011PDSER datasheet, TPS7A1011PDSER pinout, TPS7A1011PDSER application, or TPS7A1011PDSER equivalent, key selection criteria include its LILO (low-input/low-output) capability, BIAS-rail efficiency boost, active output discharge (P-version), and WSON-6 package compatibility with space-limited PCB layouts.

Technical Context

The TPS7A1011PDSER uses a dual-supply architecture: VIN supplies the pass element while VBIAS (1.7–5.5 V) powers internal control circuitry, enabling stable regulation even when VIN is only 70 mV above VOUT. Its global UVLO requires both VIN > 675 mV (rising) and VBIAS > 1.54 V (rising) before enabling regulation.

It integrates a monotonic soft-start, thermal shutdown (160°C trip), and - in the P-suffix variant - an active pulldown circuit (120 Ω) on OUT during disable or fault. PSRR reaches 60 dB at 1 kHz (VIN and VBIAS paths), and output noise is 87.6 µVRMS (10 Hz–100 kHz, VOUT = 1.0 V).

Key Specifications

Pinout & Package

TPS7A1011PDSER is packaged in a 1.50-mm × 1.50-mm, 6-pin WSON (DSE) package with wettable flanks, optimized for automated optical inspection (AOI) and thermal performance (RθJA = 188.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6216D112MR-G and ADP125ARHZ-1.1-R7, the TPS7A1011PDSER uniquely enables sub-1V operation with dual-rail efficiency, delivers tighter accuracy and lower noise, and provides active discharge - making it the only viable choice for next-gen wearables demanding LILO performance and nanoscale packaging.

Availability

TPS7A1011PDSER is available at Aetrix Electronics and suitable for smart wearables, ultra-low-power sensors, camera modules, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS7A1011PDSER 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and high-reliability solutions.

The TPS7A10 family was designed specifically for ultra-low-voltage, ultra-low-power battery-operated systems - targeting wearables, hearables, and miniaturized IoT endpoints where LILO operation, nanoscale packaging, and sub-µA quiescent current are mandatory.

FAQ

What is the minimum input voltage required for TPS7A1011PDSER to regulate a 0.5-V output?

The TPS7A1011PDSER requires VIN ≥ 0.75 V minimum per datasheet, regardless of VOUT. For a 0.5-V output, VIN must be ≥ 0.75 V and ≥ VOUT + VDO (where VDO ≤ 70 mV at 300 mA in YKA). Thus, 0.75 V satisfies both conditions. The BIAS rail (1.7–5.5 V) independently powers control circuitry, enabling this ultra-low VIN capability. TPS7A1011PDSER achieves this via its dual-rail architecture - not possible with conventional single-rail LDOs.

Does TPS7A1011PDSER support active output discharge, and how does it work?

Yes - the "P" suffix in TPS7A1011PDSER denotes the active discharge version. When EN is driven low or thermal shutdown activates, an internal 120-Ω pulldown MOSFET connects OUT to GND, discharging external capacitance. Discharge time depends on COUT and parallel load resistance (τ ≈ 120·RL·COUT/(120 + RL)). This ensures predictable power-down behavior and prevents floating outputs in sequenced systems.

What are the UVLO thresholds for VIN and VBIAS on TPS7A1011PDSER?

TPS7A1011PDSER implements global UVLO: VIN rising threshold is 675 mV (typical), falling threshold is 600 mV (typical), with 75 mV hysteresis. VBIAS rising threshold is 1.54 V (typical), falling threshold is 1.44 V (typical), with 80 mV hysteresis. Both rails must exceed their rising thresholds simultaneously for enable; either rail falling below its threshold disables regulation - preventing partial or unstable operation.

Can TPS7A1011PDSER be used with a 2.2-µF output capacitor, and is it stable?

Yes - TPS7A1011PDSER is specified for stability with 2.2 µF to 22 µF ceramic output capacitors (X5R/X7R, ≤250 mΩ ESR). A 2.2-µF capacitor meets the minimum requirement and provides optimal transient response for loads up to 300 mA. Larger values (e.g., 10–22 µF) improve ripple suppression but increase start-up time and physical footprint. Stability is guaranteed across temperature and process variation when using recommended capacitor types and layout practices.

How does the BIAS pin improve efficiency compared to traditional LDOs?

The BIAS pin on TPS7A1011PDSER powers internal control circuitry separately from VIN, allowing VIN to operate near VOUT (e.g., 0.75 V input for 0.5 V output) without starving bias current. In contrast, traditional LDOs draw all quiescent current from VIN, forcing VIN ≥ ~1.2 V for sub-1V outputs. This dual-rail architecture reduces total power loss - especially critical in battery-powered systems - and enables true LILO operation impossible with single-rail regulators.