Texas Instruments TPS70928QDBVRQ1

Overview

TPS70928QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified ultra-low-quiescent-current LDO regulator delivering 2.8 V at up to 150 mA output, with 1 µA IQ, 2% output accuracy over –40°C to 125°C, reverse current protection, and thermal shutdown - designed for always-on battery-powered systems in infotainment and body control modules.

For engineers reviewing the TPS70928QDBVRQ1 datasheet, TPS70928QDBVRQ1 pinout, TPS70928QDBVRQ1 application, or TPS70928QDBVRQ1 equivalent, key selection criteria include ultra-low shutdown current (150 nA), input voltage range (2.7 V to 30 V), fixed 2.8 V output, SOT-23-5 package compatibility, and AEC-Q100 qualification for automotive ambient operation.

Technical Context

The TPS70928QDBVRQ1 implements a PMOS pass transistor architecture with precision band-gap reference and error amplifier, enabling stable regulation with only 1 µA quiescent current and dropout as low as 295 mV at 50 mA (for 3.3 V variant; 2.8 V variant exhibits comparable low-dropout behavior per family characterization). It integrates undervoltage lockout (UVLO), active-high enable logic with 0.9 V turn-on threshold, and always-active reverse current protection limiting OUT→IN leakage to 10 nA.

Functional modes include normal regulation, dropout operation (where VOUT = VIN – VDO), and disabled state triggered by EN < 0.4 V or junction temperature > 158°C. Thermal shutdown hysteresis (140°C reset) and internal current limit (≥200 mA min) ensure robust fault handling without external circuitry.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint with exposed thermal pad electrically tied to GND; optimized for space-constrained automotive PCBs and manual reworkability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70933QDBVRQ1, the TPS70928QDBVRQ1 provides precise 2.8 V output for low-voltage logic without level-shifting overhead; versus NCP1117ST28T3G, it delivers 6000× lower quiescent current and integrated reverse protection essential for modern automotive power architectures.

Availability

TPS70928QDBVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and camera power management requiring stable component supply with AEC-Q100 traceability and extended temperature support.

Supply support for TPS70928QDBVRQ1 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 automotive-grade power management and signal chain solutions.

The TPS709-Q1 product line was engineered specifically for ultra-low-power, always-on automotive subsystems - targeting infotainment, ADAS, and body electronics where quiescent current, reliability, and qualification are non-negotiable.

FAQ

What is the maximum input voltage rating for TPS70928QDBVRQ1?

The absolute maximum input voltage for TPS70928QDBVRQ1 is 32 V, with recommended operating range from 2.7 V to 30 V. This supports automotive cold-crank (down to ~4.5 V) and load-dump (clamped to ≤40 V) conditions. Exceeding 32 V risks permanent damage per Absolute Maximum Ratings. The TPS70928QDBVRQ1 maintains regulation across this full range when load and thermal conditions remain within spec.

Does TPS70928QDBVRQ1 require an external pull-up resistor on the EN pin?

No, TPS70928QDBVRQ1 features an internal pull-up on the EN pin, allowing it to operate continuously when the pin is left floating. An external pull-up is unnecessary unless specific noise immunity or controlled power-up sequencing is required. Driving EN low (<0.4 V) disables the device, reducing ground current to 150 nA - a key feature leveraged in vehicle sleep-mode strategies for the TPS70928QDBVRQ1.

What output capacitor value is required for stability with TPS70928QDBVRQ1?

TPS70928QDBVRQ1 requires a minimum 2.2 µF ceramic output capacitor (X5R or X7R dielectric) with ESR between 0 Ω and 0.2 Ω for guaranteed stability. The datasheet permits up to 47 µF. Using less than 2.2 µF may cause oscillation or poor transient response; tantalum or aluminum electrolytics are not recommended due to ESR and aging limitations. This capacitor requirement directly impacts the reliability of the TPS70928QDBVRQ1 in automotive environments.

Is reverse current protection active in shutdown mode for TPS70928QDBVRQ1?

Yes, reverse current protection in TPS70928QDBVRQ1 is always active - independent of EN pin state or output voltage level above 1.8 V. When VOUT exceeds VIN, the internal circuit places the power path in high-impedance mode, limiting reverse current to 10 nA typical. This prevents battery discharge in multi-supply systems and remains fully functional whether the TPS70928QDBVRQ1 is enabled or in 150 nA shutdown.

What thermal performance can be expected from TPS70928QDBVRQ1 in SOT-23-5 package?

In the DBV (SOT-23-5) package, TPS70928QDBVRQ1 has RθJA = 210.9°C/W (JEDEC standard board) and RθJB = 39.4°C/W when the thermal pad is soldered to a 1-in² GND plane. At 150 mA load and 30 V input, worst-case power dissipation is ~4.0 W, requiring careful thermal design. For continuous 125°C ambient operation, a minimum 200 mm² copper pour under the thermal pad is recommended to keep junction temperature within the 150°C absolute max limit for the TPS70928QDBVRQ1.