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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