Description
The SC4503 is a 1.3MHz current-mode step-up switching regulator with an integrated 1.4A power transistor. Its high switching frequency allows the use of tiny surface-mount external passive components. The SC4503 features a combined shutdown and soft-start pin. The optional soft-start function eliminates high input current and output overshoot during start-up. The internal compensation network accommodates a wide range of voltage conversion ratios. The internal switch is rated at 34V making the device suitable for high voltage applications such as Boost and SEPIC.

Features
◆ Low Saturation Voltage Switch: 260mV at 1.4A
◆ 1.3MHz Constant Switching Frequency
◆ Peak Current-mode Control
◆ Internal Compensation
◆ Programmable Soft-Start
◆ Input Voltage Range From 2.5V to 20V
◆ Output Voltage up to 27V
◆ Uses Small Inductors and Ceramic Capacitors
◆ Low Shutdown Current (< 1μA)
◆ Low Profile 5-Lead TSOT-23 and 8-Lead 2X2mm MLPD-W packages
◆ Fully WEEE and RohS compliant Features

Applications
◆ Local DC-DC Converters
◆ TFT Bias Supplies
◆ XDSL Power Supplies
◆ Medical Equipment
◆ Digital Cameras
◆ Portable Devices
◆ White LED Drivers