1.2MHz固定工作频率,高效率低待机,可支持8颗串联LED背光驱动PT4110

GENERAL DESCRIPTION The PT4110 is a high ef ficiency step-up DC/DC converter designed for driving multiple strings of up to eight series-connected white LED from a single cell Lithium Ion battery. It regulates the output current, ideal for driving light emitting diodes (LED) whose light intensity is proportional to the current passing through them. The external ballast resistor sets the LED current ranging from 5mA to 20mA, which can be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal alternatively. Its low 300mV feedback voltage reduces power loss and improves efficiency. The PT4110 has multiple features to protect itself from fault conditions including built-in open load protection, cycle-by-cycle current limit, over temperature shutdown, input under voltage control and integrated soft-start. The PT4110 is available in SOT-89-5 and SOP-8 packages. FEATURES z 2.7V to 5.5V Input Voltage Range z 35V Maximum Step-Up Voltage z<1μA Shutdown Mode z 1.2MHz Fixed Frequency Operation z Cycle-By-Cycle Current Limit z Open Load Protection z Under Voltage Lockout z Integrated Soft-Start z Thermal Shutdown z Frequency Jittering for better EMI performance z SOT89-5 or SOP8 package z RoHS compliant APPLICATIONS z White LED Power Suppliers z Flat Screen LCD Bias Suppliers z Portable Media Players z GPSs z General middle-sized LCD backlight    
3B3嘉泰姆