• Wide Input Voltage Range from 4.5 V to 55V
• Wide Output Voltage Range from 2.5V to 55V
• Adaptive Switching between Pure Boost, Pure Buck, and Buck-Boost Modes
• Adjustable Switching Frequency 200kHz to 700kHz
• Spread Spectrum Operation  Analog Dimming and Direct Dimming
• Adjustable Soft-Start Time
• Pre-Bias Startup
• Constant Frequency with Current Mode
• Overvoltage Protection, Open LED Protection, LED Short Protection, Overtemperature Protection
• Package: TSSOP24E

The SA33761 Buck-Boost controller can automatically operate in Buck, Boost, and Buck-Boost modes based on input and output voltages. It accepts a wide input voltage range from 4.5V to 55V and can accommodate LED voltages from 2.5V to 55V.

The SA33761 operates in constant frequency current mode, with a switching frequency range of 200 kHz to 700 kHz. It provides analog dimming when the voltage on the SET pin is adjusted, and direct pulse-width modulation (PWM) dimming when a dimming signal is applied to the PWM pin.

The SA33761 offers reliable protections against faults including overvoltage, LED open/short, overtemperature, input overcurrent, and additional single faults, and includes cycle-by-cycle current limiting.