Product Highlights
• Wide Input Voltage Range: 2.5V to 22V
• Programmable Output Voltage
• 3.2V to 16V with Internal Feedback Resistors
• 3.0V to 20V with External Feedback Resistors,
See Table 1
• USB Type-C® Power Delivery (PD)/Programmable
Power Supply (PPS)
• 20mV Output Voltage Step Size
• 50mA Output Current Limit Step Size
• Maximum Output Current
• Buck Mode: Up to 6A
• Boost Mode: Up to 4A (VIN = 3.7V, VOUT = 5V)
• 7.8A Typical Switching Current
• Automatic SKIP Mode and Forced-PWM Mode
• RSEL Configuration
• I2C Interface Target Address
• Switching Current Limit Threshold
• Internal/External Feedback Resistors
• I2C Programming
• Output Voltage (DVS)
• Slew Rate of Output Voltage Change
• Output Current Limit Threshold
• Switching Current Limit Threshold
• Switching Frequency
• Forced-PWM Mode Operation (FPWM)
• Loop Compensation
• Power-OK (POK) and Fault Status/Interrupts
• Output Active Discharge
• Open-Drain Status/Interrupts Pin
• Available in a 3.01mm x 2.78mm 42 Wafer-Level
Packaging (WLP) or 4.0mm x 4.0mm 19 FC2QFN

Key Applications
• USB PD 3.0 (PPS) Dynamically-Reconfigurable
Processor (DRP) Applications
The highest output power from any existing ultrabook
Universal Serial Bus (USB) Type-C® port is 15W, 5V,
and 3A. The MAX77859 can enable USB PD output
up to 30W, and it is PPS compliant, which can double
the charging speed of any USB Type-C PD-compliant
smartphone and peripherals. When implemented, a
15-minute quick recharge on the peripheral from the
ultrabook can enable hours of operation to get
through the day.
• Space-Constrained Applications
USB-C® PD DRP design is complex and extremely
limited in real estate, especially close to the port area.
A buck-boost topology design is required to enable
USB PD, but the solution size is the critical
bottleneck. The MAX77859 is a fully integrated buckboost
converter to help shrink the solution size by
80% plus compared to a discrete buck-boost solution
with similar output power capability.