VQFN-HR (RQF)-9-3 mm² 2 x 1.5

The TPS543x21 is a high-efficiency, high-voltage input, and easy-to-use, synchronous buck converter with high design flexibility. With the wide operating input voltage range of 3.8V to 18V, the TPS543x21 is designed for systems powered from 5V, 12V power-bus rails. The device supports up to 5A, 4A, 3A continuous output current and 98% maximum duty cycle.

TPS543x21 uses fixed frequency peak current control with internal compensation for fast transient response and good line and load regulation. With the optimized internal loop compensation, the device eliminates the need for external compensation over a wide output voltage range and switching frequency. Integrated bootstrap capacitor helps achieve single layer PCB and reduce external component count.

TPS543x21 allows high design flexibility with wide supported switching frequency of 200kHz – 2.2MHz set by the RT/SYNC pin. The device has the option for pulse frequency modulation (PFM), forced continuous conduction modulation (FCCM) at light load condition and adjustable soft-start (SS) time / power-good (PG) indicator with different configuration of the MODE pin.

TPS543x21 provides protection functions including thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. TPS543x21 is available in 9-pin, 1.5mm × 2.0mm QFN package, and the pinout is available for single-layer PCB layout and the junction temperature is specified from –40°C to 150°C.