EUP2573 DS2573 Ver0.2 Mar. 2012 1 1.2MHz Step-Up PWM Controller DESCRIPTION The EUP2573 is a compact, high efficiency, fixed frequency pulse-width-modulation (PWM) controller. It provides an easy-to-use power supply solution for the application from one Li-ion battery to 5V output. All compensation and protection circuitry are integrated to minimize external components. The 1.2MHz high switching frequency allows smaller inductor and output capacitor, making the EUP2573 ideally suited for small battery-powered applications and saves PCB space. The EUP2573 contains thermal shutdown function and output short protection circuit. Built-in soft-start circuitry prevents excessive inrush current during start-up. The EUP2573 is available in a Pb-free, thin-SOT23-5 package. Typical Application Circuit FEATURES VDD Range: 2.7V to 5.5V High Efficiency up to 90% 1.2MHz Fixed Switching Frequency Tiny External Components Output Short Protection <1µA Shutdown Current 3.3V to +5.0V Distributed Power Supply Single Cell Li-ion Battery to 5V Converter Available in SOT23-5 Package RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free APPLICATIONS One Li-Ion Battery to 5V Output Handheld Devices Figure 1. Connecting VDD to VIN EUP25 7 3 DS2573 Ver0.2 Mar. 2012 2 Typical Application Circuit (Continued) Figure 2. Connecting VDD to VOUT Pin Configurations Package Type Pin Configurations SOT23-5 Pin Description PIN SOT23-5 DESCRIPTION 1 EN Enable input. EN is an active high asserted input. Set EN lower than 0.4V will disable EUP2573. 2 GND Ground. 3 EXT Output of MOSFET gate driver. Connect this pin to the gate of the external MOSFET. 4 VDD Power input. Connect VDD to the input power supply or to...
