TPS552892RYQR

The TPS552892 is an 8A buck-boost DC/DC converter with four integrated MOSFETs. It operates over a wide input voltage range of 3.0V to 36V and a wide output voltage range of 0.8V to 22V. The device transitions smoothly between buck mode, buck-boost mode, and boost mode based on the input voltage and the configured output voltage. When the input voltage is greater than the output voltage, it operates in buck mode; when the input voltage is less than the output voltage, it operates in boost mode. When the input voltage is close to the output voltage, it alternates between one buck cycle and one boost cycle. An average current mode control scheme is used. Current mode control provides simplified loop compensation, fast response to load transients, and inherent line voltage rejection. The error amplifier compares the feedback voltage against an internal reference voltage. The output of the error amplifier determines the average inductor current. The internal oscillator is configurable to operate over a wide frequency range of 200kHz to 2.2MHz. It can also synchronize to an external clock applied to the DITH/SYNC pin. To minimize EMI, the switching frequency dithering range is ±7% of the set frequency. Under moderate to heavy load current, the device operates in fixed-frequency PWM mode. Under light load conditions, it can be configured to automatically transition to PFM mode or be forced into PWM mode. A typical average inductor current limit of 8A is provided. In addition, cycle-by-cycle peak inductor current limiting is provided during transients to protect the device against overcurrent conditions that exceed the upper limit. The precise 1.23V voltage threshold and 5μA pull-up current on the EN/UVLO pin support programmable input undervoltage lockout (UVLO) with hysteresis. The output overvoltage protection (OVP) feature shuts off the high-side FET to prevent damage to devices powered by the TPS552892. The device offers a hiccup mode option to reduce heat dissipation in power components during output short-circuit conditions. It shuts down for 76ms and restarts with a soft-start sequence.

Applications

• Hub stations
• Industrial PCs
• Mobile power supplies
• Monitors
• Wireless chargers

Key features

• Wide input voltage range: 3.0V to 36V
• Programmable output voltage range: 0.8V to 22V
• ±1% reference voltage accuracy
• Adjustable output voltage compensation for cable voltage drop
• ±5% precision output current monitoring
• High efficiency across the full load range
• 96% efficiency at VIN = 12V, VOUT = 20V, and IOUT = 3A
• Programmable PFM and FPWM modes for light load conditions
• Avoids frequency interference and crosstalk
• Optional clock synchronization
• Programmable switching frequency range: 200kHz to 2.2MHz
• Reduced EMI
• Optional programmable spread spectrum
• Leadless package
• Comprehensive protection features
• Output overvoltage protection
• Output short-circuit protection via discontinuous mode
• Thermal shutdown protection
• 8A average inductor current limit
• Wide input and output voltage range
• Small solution size
• Switching frequency up to 2.2MHz (maximum)
• 3.0mm x 5.0mm HotRod QFN package