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The RTQ2133B-QA is a 1.2A high-efficiency current-mode synchronous buck converter optimized for automotive applications. The device operates from a 4V to 36V input voltage range and withstands load dump transients up to 42V, simplifying input surge protection design. The output voltage can be programmed from 0.8V up to VIN. Its peak current-mode control architecture, combined with simple external compensation, enables the use of small inductors while providing fast transient response and stable loop performance. The RTQ2133B-QA integrates comprehensive protection features, including input undervoltage lockout (UVLO), output undervoltage protection (UVP), overcurrent protection (OCP), and over-temperature protection (OTP). Cycle-by-cycle current limiting protects against output short-circuit conditions, while soft-start minimizes input current surge during startup. The RTQ2133B-QA is available in a WDFN-10SL 3mm × 3mm exposed-pad package and supports a recommended junction temperature range of -40°C to 150°C.
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