DESCRIPTION
The CX8509 is a monolithic synchronous buck regulator. The device integrates 100mΩ MOSFETS that provide 2A c...
DESCRIPTION
The CX8509 is a monolithic synchronous buck
regulator. The device integrates 100mΩ MOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.75V to 25V. Current mode control provides fast transient response and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops below 1 μA.
This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.
FEATURES
z 2A Output Current z Wide 4.75V to 25V Operating Input Range z Integrated 100mΩ Power MOSFET Switches z Output Adjustable from 0.925V to 20V z Up to 95% Efficiency z Programmable Soft-Start z Stable with Low ESR Ceramic Output Capaci-
tors z Fixed 400KHz Frequency z Cycle-by-Cycle Over Current Protection z Input Under Voltage Lockout z Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
z Distributed Power Systems z Networking Systems z Set-top Box z LCD TV/Monitor z Notebook or Mini-Book
PACKAGE REFERENCE
Part number CX8509
Package SOP8
Temperature –20° C to +85° C
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage (VIN) .......................-0.3V to 26V Switch Voltage (VSW) ...................–1V to VIN + 0.3V Bootstrap Voltage (VBS) .. .Vsw-0.3V to VSW + 6V Enable/UVLO Voltage (VEN) ............–0.3V to +6V Comp Voltage (VCOMP) .....................–0.3V to +6V Feedback Voltage (VFB) ..................–0.3V to +6V Junction Temperature ......