DESCRIPTION
The MP9459 is a fully integrated, highfrequency,
synchronous, rectified, step-down,
switch-mode converter with internal power
MOSFETs. The device is a compact solution
that achieves 4A of output current over a wide
input range with excellent load and line
regulation. It uses synchronous mode operation
for higher efficiency over the output current load
range.
Constant-on-time (COT) control operation
provides very fast transient response, easy loop
design, and very tight output regulation.
Full protection features include short-circuit
protection (SCP), over-current protection (OCP),
under-voltage protection (UVP), and thermal
shutdown.
The MP9459 requires a minimal number of
readily available, standard external
components. It is available in a space-saving
SOT563 (1.6mmх1.6mm) package.

FEATURES
 Wide 4.2V to 17V Operating Input Range
 60mΩ/30mΩ Low RDS(ON) Internal Power
MOSFETs
 200μA Low Quiescent Current
 High-Efficiency Synchronous Mode
Operation
 Power-Save Mode at Light Load
 Fast Load Transient Response
 600kHz Switching Frequency
 Internal Soft Start (SS)
 Over-Current Protection (OCP) and Hiccup
Mode
 Thermal Shutdown
 Output Adjustable from 0.8V
 Available in an SOT563 (1.6mmх1.6mm)
Package

APPLICATIONS
 Security Cameras
 Digital Set-Top Boxes
 Flat-Panel Televisions and Monitors
 General Purpose