Texas Instruments TPS7A1028PDSER

Overview

TPS7A1028PDSER from Texas Instruments is a 300-mA, ultra-low-dropout linear regulator (LDO) with dual-supply architecture (VIN + VBIAS), fixed 2.8-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 low-voltage cores in battery-constrained wearables and sensor nodes.

For engineers reviewing the TPS7A1028PDSER datasheet, TPS7A1028PDSER pinout, TPS7A1028PDSER application, or TPS7A1028PDSER equivalent, key selection criteria include its LILO (low-input/low-output) capability, BIAS-rail efficiency optimization, active output discharge (P-version), and WSON-6 package compatibility with space-limited PCB layouts.

Technical Context

The TPS7A1028PDSER implements a dual-rail LDO architecture where VIN supplies power to the pass element while VBIAS (1.7–5.5 V) powers internal control circuitry-enabling stable regulation even when VIN is as low as 70 mV above VOUT. This decoupling minimizes quiescent current: 1.6 µA from VIN and 6 µA from VBIAS at TJ = 25°C.

It integrates global UVLO (with independent thresholds for VIN and VBIAS), thermal shutdown (160°C trip), and - in the P-version - an active pulldown circuit (120-Ω resistor) for monotonic output discharge upon disable. PSRR reaches 60 dB at 1 kHz, and output noise is 87.6 µVRMS (10 Hz–100 kHz, VOUT = 1.0 V).

Key Specifications

Pinout & Package

TPS7A1028PDSER is packaged in a 1.50-mm × 1.50-mm, 6-pin WSON (DSE) package with wettable flanks, optimized for automated optical inspection 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 TPS7A0528PDQNR and MCP1826-2802E/DB, the TPS7A1028PDSER uniquely delivers 300 mA at ≤70-mV dropout with dual-rail architecture-enabling reliable 2.8-V regulation from inputs as low as 2.87 V while maintaining µA-level quiescent consumption.

Availability

TPS7A1028PDSER is available at Aetrix Electronics and suitable for smart wearables, wireless audio devices, camera modules, and portable medical sensors requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS7A1028PDSER 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 for portable and industrial applications.

The TPS7A10 product line is designed for ultra-low-power, ultra-small-footprint battery-powered systems-specifically targeting LILO (low-input/low-output) regulation where traditional LDOs fail due to insufficient VIN headroom.

FAQ

What is the minimum input voltage required for TPS7A1028PDSER to regulate 2.8 V?

The TPS7A1028PDSER requires a minimum VIN of 2.87 V (2.8 V + 70 mV dropout) to sustain 300 mA output. However, its dual-rail architecture allows VIN as low as 0.75 V when VBIAS ≥1.7 V powers the control circuitry-making it viable for sub-bandgap input scenarios where only the pass element needs headroom.

Does TPS7A1028PDSER support active output discharge, and how is it implemented?

Yes, the TPS7A1028PDSER (P-version) includes active output discharge. When EN is driven low or thermal shutdown activates, an internal 120-Ω pulldown resistor connects OUT to GND. Discharge time depends on COUT and parallel load resistance per τ = 120·RL/(120 + RL)·COUT - enabling predictable reset behavior without external components.

How does the global UVLO function in TPS7A1028PDSER?

The TPS7A1028PDSER uses two independent UVLO circuits-one on VIN (rising threshold 675 mV) and one on VBIAS (rising threshold 1.54 V)-combined via internal AND logic. Both rails must exceed their respective thresholds before regulation begins, preventing partial startup and ensuring robust power sequencing in multi-rail battery systems.

What is the recommended output capacitor for TPS7A1028PDSER, and why?

Texas Instruments specifies a minimum 2.2-µF ceramic output capacitor (X5R/X7R, ≤250 mΩ ESR) for TPS7A1028PDSER stability. Larger values (up to 22 µF) improve load transient response and reduce output noise-critical for noise-sensitive analog circuits like camera ISPs or medical ADCs powered by this device.

Can TPS7A1028PDSER operate without connecting the BIAS pin?

No. The BIAS pin must be connected to a valid supply (1.7–5.5 V) for proper operation. Leaving BIAS unconnected disables internal control circuitry, preventing regulation regardless of VIN or EN state. If a dedicated BIAS rail is unavailable, TI recommends using the TPS7A05 series instead - though with higher dropout and IQ penalties.