Texas Instruments TPS7B4256QDDARQ1

Overview

TPS7B4256QDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage tracker delivering 70 mA output with ±6 mV tracking tolerance, 225 mV max dropout at full load, and operation across 3 V to 40 V input for off-board sensor power in harsh environments.

For engineers reviewing the TPS7B4256QDDARQ1 datasheet, TPS7B4256QDDARQ1 pinout, TPS7B4256QDDARQ1 application, or TPS7B4256QDDARQ1 equivalent, key selection factors include ultra-tight tracking accuracy under temperature variation, integrated reverse polarity/short-circuit protection, and dual-package support (HSOIC-8/DDA and SOIC-8/D) for thermal optimization in body control modules and powertrain sensors.

Technical Context

The TPS7B4256QDDARQ1 implements a back-to-back PMOS topology enabling reverse current protection without external diodes and survives automotive load dump transients up to 45 V absolute maximum input. Its error amplifier compares FB voltage against ADJ/EN reference with 0.1–0.25 µA input bias current and supports three output configurations: direct tracking (FB→OUT), scaled-down (resistor divider on ADJ/EN), or scaled-up (resistor divider between FB and OUT).

It integrates undervoltage lockout (2.6–2.85 V rising threshold), thermal shutdown at 175°C with 15°C hysteresis, brick-wall current limiting (85–125 mA), and operates with ceramic output capacitors from 1 µF to 100 µF and ESR 1 mΩ to 2 Ω - all verified across –40°C to +150°C junction temperature.

Key Specifications

Pinout & Package

TPS7B4256QDDARQ1 is supplied in the DDA package: 8-pin HSOIC with exposed thermal pad (4.9 mm × 6 mm), RθJA = 53.3°C/W. The thermal pad must be soldered to GND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B4250QDDARQ1, the TPS7B4256QDDARQ1 provides 40% higher output current for driving multiple sensors or noise-sensitive analog front-ends; compared with TPS7B8750QKVURQ1, it delivers precision tracking essential for ratiometric measurement integrity but trades off maximum current capacity.

Availability

TPS7B4256QDDARQ1 is available at Aetrix Electronics and suitable for automotive powertrain sensing, body control modules, and off-board sensor interfaces requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle assurance.

Supply support for TPS7B4256QDDARQ1 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 designing analog ICs, embedded processors, and connectivity solutions for automotive, industrial, and consumer markets.

The TPS7B4256QDDARQ1 belongs to TI's automotive-grade LDO tracker product line, engineered specifically to replace discrete protection + regulation circuits in off-board sensor power architectures with single-chip robustness and precision.

FAQ

What is the maximum input voltage the TPS7B4256QDDARQ1 can withstand?

The TPS7B4256QDDARQ1 has an absolute maximum input voltage rating of +45 V and can survive automotive load dump transients. Its recommended operating input range is 3 V to 40 V. Operation beyond 40 V is permissible only for transient events within the absolute maximum ratings - continuous operation above 40 V may compromise reliability or parametric performance. The device also tolerates –40 V reverse input without damage due to integrated reverse polarity protection.

How does the TPS7B4256QDDARQ1 achieve ±6 mV tracking accuracy?

The TPS7B4256QDDARQ1 achieves ±6 mV tracking accuracy by comparing the FB pin voltage (noninverting input) against the ADJ/EN pin voltage (inverting input) using a precision error amplifier with low input bias current (0.1–0.25 µA). This architecture maintains tight regulation across –40°C to +125°C ambient and 100 µA–70 mA load, with tracking error specified as the deviation of VFB from VADJ/EN - directly enabling ratiometric sensor supply matching to ADC references.

Can the TPS7B4256QDDARQ1 be used with output voltages higher than the ADJ/EN reference?

Yes, the TPS7B4256QDDARQ1 supports output voltages higher than the ADJ/EN reference by connecting an external resistor divider between the FB and OUT pins. Using Equation 3 from the datasheet (VOUT = VREF × [1 + R1/R2]), designers can scale the output up while maintaining ±6 mV tracking tolerance relative to the ADJ/EN voltage. Both R1 and R2 must be ≤100 kΩ to minimize error from FB pin leakage current (≤0.25 µA).

What thermal package options are available for the TPS7B4256QDDARQ1?

The TPS7B4256QDDARQ1 is offered in two thermally optimized packages: the 8-pin SOIC (D) with RθJA = 101°C/W and the 8-pin HSOIC (DDA) with RθJA = 53.3°C/W. The DDA package includes an exposed thermal pad that must be soldered to a GND plane for optimal heat dissipation. For applications demanding higher power handling or tighter thermal margins - such as under-hood powertrain modules - the DDA variant is strongly preferred.

Does the TPS7B4256QDDARQ1 require external components for stability?

The TPS7B4256QDDARQ1 is internally compensated and stable with ceramic output capacitors ranging from 1 µF to 100 µF and ESR from 1 mΩ to 2 Ω - no external compensation network is needed. A minimum 1 µF ceramic input capacitor is required, and a 0.1 µF capacitor is recommended close to the ADJ/EN pin to suppress noise. These requirements are validated across temperature and load, eliminating dependency on specific capacitor chemistries or vendor qualifications.