MAX77857BEWB+T

The MAX77857 is a high-efficiency, high-performance buck-boost converter targeted for systems requiring a wide input voltage range (2.5V to 16V). It features 7A switching current and can supply up to 6A output current in buck mode and up to 4A in boost mode (Boost Ratio ≤ 1.3). It operates in PWM mode and implements an automatic SKIP mode to improve light-load efficiency. The default output voltage is 5V when using internal feedback resistors. It can also be configured to any default output voltages between 3V and 15V when using external feedback resistors. The output voltage is adjustable dynamically through the I2C serial interface. The SEL pin allows a single external resistor to program four different I2C interface slave addresses, four different switching current limit thresholds, and selection between external/internal feedback resistors. The different switching current limit thresholds allow the use of lower profile and smaller external components that are optimized for a particular application. The use of external feedback resistors allows for a wider output voltage range and customizable output voltages at startup. The I2C serial interface is optional and allows for dynamically controlling the output voltage, slew rate of the output voltage change, switching-current limit threshold, switching frequency, and forced PWM mode operation. The I2C-programmed settings have priority over the RSEL decoded settings. The MAX77857 is available in a 2.83mm×2.03mm, 35-bump and 31-bump wafer-level package (WLP) and a 3.5mm x 3.5mm, 16-lead Flip Chip QFN package (FC2QFN).

Applications

• USB Power Delivery (USB-PD) OTG
• Qualcomm Quick Charge
• USB VBUS Supply and DRP (Dual Role Power) Ports
• DSLR, DSLR Lens
• Display Power
• Up to 3-Cell Li-Ion Battery Applications
• Notebook Computer, Tablet PC

Key features

• I2C Programming
• Output Voltage (DVS)
• Slew Rate of Output Voltage Change
• Switching Current Limit Threshold
• Switching Frequency
• Forced PWM Mode Operation (FPWM)
• Power-OK (POK) Status and Fault Interrupt Masks
• Soft-Start
• Output Active Discharge
• Open-Drain Power-OK (POK) Monitor and Fault Condition Interrupt (MAX77857B/C Only)
• Protection Features: Undervoltage Lockout (UVLO), Overcurrent Protection (OCP), Overvoltage Protection (OVP), Thermal Shutdown (THS)
• High Density Interconnect (HDI) PCB not Required
• Available in 2.83mm x 2.03mm 35 WLP or 31 WLP or 3.5mm x 3.5mm 16 FC2QFN