STMicroelectronicsSTEVAL-ISA082V1Power Management Development Boards and Kits

The STEVAL-ISA082V1, based on the ST1S40IPHR, is an internally compensated 800 kHz fixed-frequency PWM synchronous step-down converter demonstration board. The ST1S40 operates from 4.0 V to 18.0 V input, while it regulates an output voltage as low as 0.8 V and up to VIN(100% duty cycle). The ST1S40 integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltage. The peak current mode control with internal compensation delivers a very compact solution with a minimum component count. The ST1S40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit.

-Input voltage Vin : 4 V to 18 V
-Output voltage Vout : 3.3 V
-Maximum output current : 4 A
-Switching frequency: 800 kHz
-Short-circuit protected
-RoHS compliant

SCHEMATIC PACKS  http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_DIAGRAM/SCHEMATICPACK/steval-isa100v1_schematic.pdf