SC190

POWER MANAGEMENT Description The SC190 is a synchronous step-down converter with integrated power devices and an integrated front-end LDO to minimize input supply ripple. Output voltage is programmable using two control bits, eliminating the need for feedback resistors tied to the output. The device is offered in four distinct variants with each variant providing four fixed output voltage options to choose from. The front-end LDO can be bypassed externally to maximize efficiency. A second LDO is switched in place of the switching regulator for low current operation to further improve efficiency and reduce noise. SC190 Synchronous Buck Converter with Programmable Output www.DataSheet4U.com Features Features  Less than 1mV Supply Ripple  Output Voltage Regulated by Either the Switching     Regulator or Linear Regulator Dynamic Handover Between Linear and Switching Regulator for Maximum Efficiency 2.7V to 5.5V Input Range 300mA Guaranteed Output Current Fixed Frequency 1MHz Operation or 750kHz to 1.5MHz Clocked Operation No Schottky Diode Required Up to 95% Efficiency (VIN=BP) Over-current Protection Over-voltage Protection Over-temperature Protection Soft Start MLP-10, 3 x 3mm Lead-frame, Lead-free Package Low Output Noise < 100µVrms     The SC190’s flexible clocking scheme allows it to be  synchronized to an external oscillator or controlled by the  internal oscillator. The 1MHz switching frequency allows  the use of small inductors and capacitors.  The internal MOS...