EUP2621

EUP2621 620kHz/1.25MHz Step-up DC/DC Converter DESCRIPTION The EUP2621 is a high performance current mode, PWM step-up converter with pin selectable operating frequency. With an internal 1.6A, 200m£[ MOSFET, it can generate 12V at up to 400mA output current from a 5V supply. The selectable 620kHz and 1.25MHz allows smaller inductors and faster transient response. An external compensation pin gives the user greater flexibility in setting loop compensation allowing the use of low ESR Ceramic output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate during start-up. When shut down, it draws¡Õ 10µA of current and can operate down to 2.5V input supply. These features along with 1.25MHz switching frequency makes it an ideal device for portable equipment and TFT-LCD displays. The EUP2621 is available in an 8-pin MSOP package. The device is specified for operation over the full -40°C to +85°C temperature range. FEATURES z z z z z z z z z 90% Efficiency 1.6A, 200mΩ Power MOSFET 2.5V to 5.5V Input Range Adjustable Output Voltage up to 18V 620kHz/1.25MHz Switching Frequency Selection Adjustable Soft-Start Internal Thermal Protection Small MSOP-8 package RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS z z z z z z TFT-LCD Displays DSL Modems Set-Top Boxes PCMCIA Cards Portable Equipment Handheld Devices Typical Application Circuit VÛm w`R yÑb € ww w.g ofot ech. com Figure 1. 5V to 12V Step-Up DS2621 Ver 1.0 July ...