Texas Instruments TPS628502QDRLRQ1

TPS628502QDRLRQ1 Texas Instruments Step-Down Converter Product Summary

The TPS628502QDRLRQ1 from Texas Instruments is a high-efficiency, synchronous buck step-down converter, specifically engineered for demanding automotive applications. Housed in an ultra-compact SOT-583 package, this device supports a continuous output current of up to 2A, making it an optimal solution for modern vehicular electronics requiring stable low-voltage power rails sourced from higher-voltage buses. The TPS628502QDRLRQ1 offers adjustable positive output voltages from as low as 0.6V up to 5.5V, catering to a wide array of digital and analog system requirements within automotive designs.

Notable Characteristics of the TPS628502QDRLRQ1 Texas Instruments Automotive Buck Regulator

The TPS628502QDRLRQ1 is AEC-Q100 qualified for automotive reliability, rated for ambient operating temperatures from -40°C to +125°C and junction temperatures up to 150°C. Functional safety support is embedded, with documentation available to aid system designers in safety-critical environments. Low electromagnetic interference (EMI) performance is another standout feature, achieved with optional pseudo-random spread spectrum switching, allowing for compliance in sensitive automotive environments.

A low quiescent current of 17μA enables design for systems with stringent standby power needs. The switching frequency is externally programmable between 1.8MHz and 4MHz or can be synchronized to external clocks for precise power sequencing and frequency management. Advanced features such as 100% duty cycle operation, active output discharge, forced PWM/PFM modes, precise enable input for user-defined undervoltage lockout, and windowed power-good reporting provide comprehensive power control and robust protection mechanisms.

Automotive Electronics Uses of TPS628502QDRLRQ1 Texas Instruments

This step-down converter is particularly well-suited for:

ADAS (Advanced Driver Assistance Systems) cameras and sensor fusion blocks

Surround-view electronic control units (ECUs)

Automotive infotainment clusters and reconfigurable dashboards

Head units and telematics control modules

External audio amplifiers and analog subsystems

By supporting adjustable voltage rails, high efficiency across a broad load range, and robust EMI management, the TPS628502QDRLRQ1 substantially simplifies power distribution architectures in next-generation vehicles.

TPS628502QDRLRQ1 Texas Instruments Internal Structure and Working Mechanism

At its core, the TPS628502QDRLRQ1 employs a peak current mode control topology with internally-compensated feedback loops, supporting fast, stable operation with minimal external components—ideal for low-ESR ceramic output capacitors. Two independent compensation settings are selectable via resistor configuration at the COMP/FSET pin, allowing optimization for the designer’s specific output capacitance and transient response demands.

Operating modes include forced fixed-frequency PWM (high noise immunity, preferable for analog-sensitive environments) and automatic PWM/PFM (power save mode) to maximize efficiency at light loads. Switching frequency can be selected either by external resistor or by synchronizing to a system clock, facilitating complex sequencing and noise mitigation strategies.

Protection features are comprehensive: active output discharge ensures controlled output voltage ramp-down on shutdown, overcurrent foldback limits response to persistent overloads, undervoltage lockout prevents malfunction on supply dips, and thermal shutdown intervenes during over-temperature events. Synchronizable operation and spread spectrum clocking further address system-level EMI and coordination requirements.

Key Electrical and Thermal Specifications of TPS628502QDRLRQ1 Texas Instruments

The TPS628502QDRLRQ1 operates over a 2.7V to 6V input range, supporting output voltages from 0.6V to 5.5V with ±1% accuracy in PWM mode. The device can deliver 2A continuous output current (at up to 105°C junction temperature), with a peak rating of 3A (at lower junction temperatures). This converter achieves remarkable power efficiency and thermal performance, with detailed specifications for absolute maximum ratings, recommended operating conditions, ESD robustness, and thermal resistance metrics, ensuring suitability for demanding automotive power environments.

TPS628502QDRLRQ1 Texas Instruments Pinout and Functional Overview

The TPS628502QDRLRQ1 is presented in an 8-pin SOT583 package, offering straightforward integration into dense PCB layouts. The pinout includes vital connections for VIN, VOUT, enable (EN), MODE/SYNC (operation mode or external synchronization), feedback (FB), compensation/frequency setting (COMP/FSET), ground (GND), and power-good indication (PG). Each pin serves a specific role in configuring, monitoring, and protecting the converter during runtime.

For example, utilizing the EN pin with an RC network enables controlled power-up sequencing and undervoltage lockout, while the PG pin’s open-drain output provides system-level indication of output regulation status.

Choosing External Components for TPS628502QDRLRQ1 Texas Instruments

Careful selection of inductors and capacitors is central to exploiting the TPS628502QDRLRQ1’s full performance envelope. A nominal 0.47μH inductor is recommended for 2.25MHz operation, with consideration of saturation current and DC resistance (DCR) to ensure robust transient and load response. Output voltage is programmed via a resistor divider referenced to the 600mV FB pin, with recommended resistances to minimize error and enhance accuracy.

Utilizing low-ESR ceramic input (typically 10μF) and output (minimum 10μF for output voltages >1V) capacitors achieves minimal output voltage ripple and fast load transient performance. The COMP/FSET pin supports precise tuning of compensation and switching frequency, adapting the converter for oversized or distributed capacitance environments.

TPS628502QDRLRQ1 Texas Instruments Design Strategies and Common Applications

A typical TPS628502QDRLRQ1 application circuit implements the adjustable buck configuration with programmable output voltage and current. Real-world efficiency curves, load and line transient responses, output voltage ripple, and start-up timing behaviors are extensively documented, providing engineers with empirical benchmarks for sizing components and validating performance against application requirements.

For fixed output voltage versions, external feedback dividers can be omitted, reducing solution size and further improving regulation accuracy. Synchronization of multiple converters is accomplished via the MODE/SYNC pin, facilitating advanced power sequencing and inter-module EMI suppression.

PCB Design Guidelines for TPS628502QDRLRQ1 Texas Instruments

High-frequency switching regulators rely on expertly crafted PCB layouts to ensure operational integrity and minimize EMI. Designers should position input and output capacitors as near as possible to respective VIN and VOUT pins, maintain short, wide traces for high di/dt current paths, and provide robust system ground connectivity. Sensitive nodes (e.g., FB) must avoid proximity to noisy signals to preserve feedback accuracy. The use of thermal vias at VIN and GND pins aids in heat dissipation, supporting reliable operation at elevated ambient and junction temperatures. Reference designs and evaluation module layouts are available to guide optimal board routing and component placement.

TPS628502QDRLRQ1 Texas Instruments Package Details and Environmental Testing

The TPS628502QDRLRQ1 is supplied in a low-profile (0.6mm max height) plastic small outline SOT583 package, supporting automated pick-and-place assembly and high-density board designs. The device is fully compliant with RoHS and green environmental directives, offering high solder temperature compatibility and robust materials per JEDEC and IPC standards. Moisture Sensitivity Level (MSL) and peak reflow temperature ratings ensure dependable assembly and field reliability. Manufacturers are advised to consult TI’s packaging documentation for the latest stencil, pad, and board layout recommendations.

Alternative and Replacement Options for TPS628502QDRLRQ1 Texas Instruments

For systems requiring alternative current ratings or configuration flexibility, the TPS62850x-Q1 family includes TPS628501-Q1 (1A output) and TPS628503-Q1 (3A peak output) models, all pin-to-pin compatible and sharing core features. Additionally, fixed-output versions—such as TPS628501B0QDRLRQ1 (internally fixed output voltage) and TPS6285020AQDRLRQ1—enable engineers to further optimize solution size and accuracy while maintaining power supply compatibility.

Conclusion

The TPS628502QDRLRQ1 from Texas Instruments offers a robust and versatile platform for automotive power conversion, delivering high efficiency, flexible design options, and advanced protection features in a compact package. Its comprehensive feature set supports both legacy and next-generation automotive electronic architectures, from ADAS and infotainment to distributed power management. With full environmental qualification, sophisticated EMI management, and scalable family variants, the TPS628502QDRLRQ1 stands as a benchmark solution for engineers and procurement professionals seeking reliable, high-performance automotive step-down conversion.