• Wide Input/output Voltage Range: 5V to 50V 
• 1.6V±1.4% Reference Voltage over -40℃~125 ℃
• Selectable 1-, 2-, or 4 (Two Devices Paralleled) Interleaved Phase Operation
• Supports Spread Spectrum Function
• Power Good Indicator
• Supports External Synchronization
• Supports Tracking Function
• Integrated N-channel MOSFET Drivers: 5V 2A Sourcing/3A Sinking
• Programmable Frequency Per Phase: 50kHz to 1.1MHz
• Programmable Dead Time and Minimum Duty Cycle
• Light Load Operating Mode Selection: PFM or FCCM 
• Selectable Phase Drop and Phase Add Function
• Fully Protected for Over Voltage, Over Current and Over-Temperature 
• Selectable Hiccup or Latch-off Fault Response
• RoHS Compliant and Halogen Free
• Compact Package QFN5×5-32 
• Moisture Sensitivity Level (MSL): 3

The SQ25900 is a dual-phase stackable synchronous boost controller. It operates over a wide input voltage range from 5V to 50V and utilizes constant frequency peak current mode control. The SQ25900 operates at a switching frequency ranging from 50kHz to 1.1MHz per phase and can be synchronized to an external clock. It supports single-phase, dual-phase, and 4-phase operation to reduce output ripple and capacitance. Additionally, the spread spectrum function can be used to minimize peak emissions, resulting in lower electromagnetic interference (EMI).

The SQ25900 features external soft-start, enable control, and an open-drain power good indicator. It also includes comprehensive protection features, such as cycle-bycycle overcurrent protection, input overvoltage protection, output overvoltage protection, and thermal shutdown for reliable operation. The fault protection response can be configured for either latch-off or hiccup recovery.

The SQ25900 is available in compact QFN5×5-32 package.