Texas Instruments TPS65300QPWPRQ1

Overview

TPS65300QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating a 5.3-V/1.2-A synchronous buck regulator, a fixed 5-V linear regulator, and two external-transistor linear regulator controllers (3.3 V and 1.234 V). It features voltage supervision of all three regulated outputs, programmable power-on-reset delay via external capacitor, and 2–3 MHz switching frequency for compact magnetics. It powers TMS570 microcontrollers in engine control units.

For engineers reviewing the TPS65300QPWPRQ1 datasheet, TPS65300QPWPRQ1 pinout, TPS65300QPWPRQ1 application, or TPS65300QPWPRQ1 equivalent, key selection criteria include its 5.6–40 V input range, integrated 45-V high-side MOSFET, ±1.5% reference accuracy on 1.234 V output, IGN_EN high-voltage enable (up to 40 V), and thermal shutdown at 150°C junction temperature.

Technical Context

The TPS65300QPWPRQ1 implements a voltage-mode asynchronous buck controller with internal 45-V/1.2-A peak-current switch and integrated bootstrap LDO (BOOT_LDO) for gate drive. Its error amplifier (COMP) accepts external compensation to optimize transient response across load and line variations.

It embeds three independent regulation paths: a fixed 5-V LDO (5V pin), a 3.3-V linear regulator controller (3.3VDRIVE/3.3VSENSE) driving an external NPN transistor, and a 1.234-V linear regulator controller (1.2VDRIVE/1.2VSENSE) for CPU core supply. All three outputs are monitored by a single voltage supervisor that asserts nRST if any falls below 90% of nominal.

Key Specifications

Pinout & Package

TPS65300QPWPRQ1 is packaged in a thermally enhanced 24-pin HTSSOP (PWP) with exposed PowerPAD™, measuring 7.80 mm × 4.40 mm. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 14.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive multi-rail power management applications.

Compared with TPS65300QPWPRQ1, TPS65381AQ1 offers higher integration but sacrifices the precision 1.234 V controller needed for TMS570 core regulation, while LM66100Q1 lacks both buck conversion and voltage supervision - making neither a drop-in replacement, but both viable for simplified or modular power architectures.

Availability

TPS65300QPWPRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for TPS65300QPWPRQ1 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies for automotive, industrial, and communications markets.

The TPS65300-Q1 product line delivers AEC-Q100-compliant power management solutions optimized for real-time microcontrollers in safety-critical automotive ECUs, with emphasis on robustness under battery transients and precise multi-rail sequencing.

FAQ

What is the maximum input voltage the TPS65300QPWPRQ1 can withstand during load dump?

The TPS65300QPWPRQ1 supports input transients up to 45 V on VIN and VIN_D pins, as specified in its Absolute Maximum Ratings table. This rating ensures reliable operation during ISO 7637-2 Load Dump Pulse 5a (40 V, 100 ms) and Pulse 5b (50 V, 400 ms) when properly decoupled with input filtering. The internal 45-V MOSFET and clamping structures protect the device without external TVS diodes in most standard 12 V/24 V automotive applications.

How does the TPS65300QPWPRQ1 achieve accurate 1.234 V core regulation despite using external bipolar transistors?

The TPS65300QPWPRQ1 achieves ±1.5% accuracy on the 1.234 V output by using a precision internal 0.8 V ±1.5% reference and high-gain error amplifier driving the 1.2VDRIVE pin. The 1.2VSENSE pin samples the emitter voltage of the external NPN transistor, closing a feedback loop that compensates for V_BE drift and current gain variation across temperature. This architecture maintains regulation accuracy independent of transistor beta or thermal characteristics.

Can the TPS65300QPWPRQ1 operate with a 24 V nominal battery system?

Yes, the TPS65300QPWPRQ1 operates across 5.6 V to 40 V input, covering both 12 V and 24 V automotive battery systems. At 24 V nominal, it delivers full 1.2-A buck output with typical efficiency >88% at 500 mA load and 2.5 MHz switching, while maintaining thermal rise within limits due to its 14.5°C/W junction-to-board resistance in the HTSSOP package.

What is the purpose of the IGN_ST pin on the TPS65300QPWPRQ1?

The IGN_ST pin on the TPS65300QPWPRQ1 is an active-low, open-drain status indicator that asserts low when the IGN_EN input falls below 2.2 V, signaling ignition-off condition to external monitoring circuitry. It provides immediate notification of key-off events independent of the nRST timing sequence, enabling fast system shutdown sequencing and non-volatile memory save operations before main power collapse.

Does the TPS65300QPWPRQ1 require external compensation components for the buck regulator?

Yes, the TPS65300QPWPRQ1 requires external RC compensation components connected to the COMP pin to stabilize the voltage-mode buck control loop. The datasheet provides design equations and recommended values based on selected inductor, output capacitor, and target crossover frequency. Omitting or mis-sizing these components risks instability, excessive output ripple, or poor transient response under dynamic load changes.