SC191

Low Supply Ripple Synchronous www.DataSheet4U.com Buck Conversion Regulator POWER MANAGEMENT Description The SC191 is a synchronous step-down converter with integrated power devices and an integrated front-end LDO regulator to minimize input supply ripple. If supply ripple is not a concern, the front-end LDO regulator can be bypassed externally to maximize efficiency. The internal MOSFET switches provide peak current greater than 550mA to achieve a DC output of at least 330mA over the rated input voltage range, making the SC191 ideal for single-cell Li-ion battery applications as well as fixed 3.3V and 5V fixed input applications. The output is a fixed 1.2V - ideal for low-voltage microprocessors. Other voltage options are available (consult the factory for details). Additional features include internal soft-start to limit inrush current, over-current protection, over-temperature protection, and over-voltage protection. The 1MHz switching frequency allows the use of small surface mount capacitors and inductors, and no other external compensation components are needed. The device is available in a low profile (0.8mm max height) 2.3mm x 2.3mm MLPD 8-lead package, minimizing area without compromising performance. SC191 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Less than 1mV Supply Ripple 2.7V to 5.5V Input Range 330mA Guaranteed Output Current Fixed Frequency 1MHz Operation No Schottky Diode Required Over-Current Protection Over-Voltage Protection Over-Temperature Protection Soft-Start No E...