Texas Instruments TPS54680QPWPRQ1

Overview

TPS54680QPWPRQ1 from Texas Instruments is an automotive-grade, synchronous buck PWM converter with integrated 30-mΩ high- and low-side MOSFETs, delivering up to 6-A continuous output current at adjustable output voltages from 0.9 V to 3.3 V. It operates across a wide input range of 3 V to 6 V, supports fixed 350 kHz or adjustable 280–700 kHz switching frequency, and features power-up/down tracking via TRACKIN for precise sequencing in multi-rail systems-ideal for powering FPGAs and DSPs in automotive ADAS modules.

For engineers reviewing the TPS54680QPWPRQ1 datasheet, TPS54680QPWPRQ1 pinout, TPS54680QPWPRQ1 application, or TPS54680QPWPRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, thermal performance in the 28-pin HTSSOP PowerPAD™ package, peak current limit protection, and compatibility with external frequency setting resistors for EMI-sensitive designs.

Technical Context

The TPS54680QPWPRQ1 implements a voltage-mode synchronous buck architecture with a high-performance error amplifier (90–110 dB open-loop gain, 3–5 MHz unity-gain bandwidth) enabling flexible LC filter design. Its adaptive dead-time control prevents shoot-through, while internal slope compensation stabilizes PWM operation across duty cycles up to 90%.

Power sequencing is achieved through the TRACKIN pin, which accepts external reference signals to coordinate startup/shutdown timing with other regulators. The device integrates under-voltage lockout (2.95 V start, 2.80 V stop), thermal shutdown (135–165 °C trip), and open-drain PWRGD signaling with 90% Vref threshold and 3% hysteresis.

Key Specifications

Pinout & Package

The TPS54680QPWPRQ1 is housed in a thermally enhanced 28-pin HTSSOP (PWP) PowerPAD™ package measuring 6.4 mm × 9.7 mm, with an exposed thermal pad soldered directly to AGND for optimal heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480QRNLRQ1 and TPS544B25RURLR, the TPS54680QPWPRQ1 uniquely balances automotive qualification, integrated tracking, and 6-A capability in a cost-optimized analog-control solution-making it optimal for FPGA/DSP sequencing where digital complexity and higher current are unnecessary.

Availability

TPS54680QPWPRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC CPU boards, and optical transceiver line cards requiring stable component supply and AEC-Q100 compliance.

Supply support for TPS54680QPWPRQ1 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 specializing in analog, embedded processing, and power management technologies with decades of automotive qualification expertise.

The TPS54680QPWPRQ1 belongs to TI's SWIFT™ family of high-current DC/DC regulators, designed specifically for low-voltage, high-density point-of-load applications in automotive and industrial systems demanding sequencing, thermal robustness, and high reliability.

FAQ

What is the recommended input capacitance for TPS54680QPWPRQ1?

TI specifies two 10-µF ceramic capacitors (e.g., Taiyo Yuden) placed close to VIN pins 20–24 and PGND pins 15–19. One serves as bulk input filter (C6), the other as high-frequency decoupling (C7). Total effective capacitance must handle ripple current and maintain impedance below 10 mΩ at switching frequency to prevent input voltage sag during load transients. The TPS54680QPWPRQ1 datasheet Figure 9 confirms this dual-capacitor layout.

Does TPS54680QPWPRQ1 support output voltage adjustment outside the 0.9 V–3.3 V range?

No. The TPS54680QPWPRQ1's internal voltage reference and error amplifier are trimmed and characterized for 0.9 V to 3.3 V output. Attempting to set lower voltages risks instability due to reduced loop gain; higher voltages exceed the VSENSE pin's absolute maximum rating of 4 V. The datasheet's ORDERING INFORMATION table explicitly lists "0.9 V to 3.3 V" as the output voltage range for TPS54680QPWPRQ1.

How is thermal performance affected if the PowerPAD™ is not soldered to AGND?

Without soldering the exposed thermal pad to AGND, the junction-to-ambient thermal resistance increases from 18.2 °C/W to 40.5 °C/W, reducing maximum power dissipation at 70 °C ambient from 3.02 W to 1.36 W. This limits continuous output current to ~3.5 A before thermal shutdown activates. The TPS54680QPWPRQ1 datasheet Section "DISSIPATION RATINGS" quantifies this derating and mandates PowerPAD™ connection per SLVA113 application report.

Can TPS54680QPWPRQ1 be used without an external RT resistor?

Yes. Leaving RT (Pin 28) open configures the TPS54680QPWPRQ1 for its internally set 350 kHz switching frequency. This is the default configuration shown in Figure 9 of the datasheet. External RT resistors (68 kΩ to 180 kΩ) are optional and only required when adjusting frequency to 280–700 kHz for EMI mitigation or efficiency tuning.

What is the function of the TRACKIN pin in TPS54680QPWPRQ1?

The TRACKIN pin enables precise power-up and power-down sequencing by accepting an external voltage ramp. When TRACKIN rises slower than the internal 25 V/ms slope, the output follows it; when faster, the output ramps at the internal rate. This allows coordinated startup with other regulators-e.g., ensuring FPGA I/O voltage is established before core voltage. The TPS54680QPWPRQ1 block diagram and Section "TRACKIN/INTERNAL SLOW-START" confirm this behavior.