The MP8859 is a synchronous, 4-switch,
integrated buck-boost converter capable of
regulating the output voltage from a 2.8V to 22V
wide input voltage range with high efficiency.
The integrated output voltage scaling and
adjustable output current limit functions meet the
USB power delivery (PD) requirement.
The MP8859 uses constant-on-time (COT)
control in buck mode and constant-off-time
control in boost mode, providing fast load
transient response and smooth buck-boost
mode transient. The MP8859 provides auto
PFM/PWM or forced PWM switching modes,
programmable output constant current (CC)
current limit, which supports flexible design for
Full protection features include over-current
protection (OCP), over-voltage protection
(OVP), under-voltage protection (UVP),
programmable soft start, and thermal shutdown.
The MP8859 is available in a 16-pin QFN
2.8 - 22V VIN, 3A IOUT, 4-Switch,
Integrated Buck-Boost Converter
with I2C Interface
Wide 2.8V to 22V Operating Input Voltage
1V (1) to 20.47V Output Voltage Range (5V
Default) with 10mV Resolution through I2C
3A Output Current or 4A Input Current
Four Low RDS(ON) Internal Buck Power
Adjustable Accurate CC Output Current
Limit with Internal Sensing MOSFET via I2C
500kHz Switching Frequency
Output Over-Voltage Protection (OVP)
Output Short-Circuit Protection (SCP) with
Over-Temperature Warning and Shutdown
I2C Interface with ALT Pin
Four Programmable I2C Addresses
One-Time Programmable (OTP) Non-
I2C Programmable Line Drop
Compensation, PFM/PWM Mode, Soft Start,
EN Shutdown Discharge Programmable
Available in a QFN-16 (3mmx3mm)
UL Certified, UL2367: E322138
UL60950-1/ UL60950-1-07: E500002-A1-
USB PD Sourcing Ports
Buck-Boost Bus Supplies
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are registered trademarks of Monolithic
Power Systems, Inc.
1) For VOUT < 3V applications, the switching frequency decreases.
MP8859 Rev 1.0
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.