DESCRIPTION
The MPQ4570 is a frequency programmable
step-down switching converter with integrated
internal high-side and low side power MOSFETs.
It can provide 3A continuous output current with
peak current control for excellent transient
response and efficiency performance.
The wide 4.5V to 55V input voltage range
accommodates a variety of step down
applications, including those applications in
industrial, PoE, automotive and printer with DC
high voltage bus.
The MPQ4570 uses peak current mode control to
regulate the output voltage. The chip provides
over current protection with valley current
detection which is used to avoid current running
way. Also it has accurate and reliable over
voltage protection, and auto recovery thermal
protection. In addition, the optional external soft
start is available. Enable and power good
indication function can be used to power track
easily. In order to increase the efficiency,
MPQ4570 will automatically scaling down the
switching frequency when load is light.
Meanwhile, the low side MOSFET will be turned
off to reduce driver loss when zero inductor
current is detected. MPQ4570 also features as
a fully integrated solution with both high side
and low side power MOSFETs. Synchronous
operation mode with integrated low side
MOSFET is much helpful to reduce the
conduction loss and also beneficial to reduce
external components space and save the cost.
The MPQ4570 is available in a TSSOP-20 EP
with exposed pad package.

FEATURES
 Wide Input Voltage Range: 4.5V to 55V
 90mΩ and 70mΩ Internal High and Low
Power MOSFETs
 Peak Current Mode Control
 Programmable Switching Frequency
 Stable Independent on Output Capacitors
 Optional External Soft Start
 OCP Protection with Valley Current
Detection
 Support External SYNC Clock
 OVP Protection
 Current Limit Decreasing during Output
Short for Better Thermal Performance
 Power Good Indication
 Thermal Shutdown Protection
 Available in a TSSOP-20 EP Package.
 Available in AEC-Q100 Grade 1
APPLICATIONS
 PoE Input Non-isolated Buck
 Industrial Power Systems
 Printers and Scanners
 Automotive Power Systems
 Distributed Power Systems