LR8301

LESHAN RADIO COMPANY, LTD. SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER Introduction The LR8301 Series is a CMOS PFM-control step-up switching DC/DC converter that mainly consists of a reference voltage source, an oscillator, and a comparator. The PFM controller allows the duty ratio to be automatically switched according to the load (light load: 50%, high output current: 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current. With the LR8301 Series, a step-up switching DC/DC converter can be configured by using an external coil, capacitor, and diode. The built-in MOS FET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current consumption, makes the LR8301 Series ideal for applications such as the power supply unit of portable equipment. Applications Power supply for portable equipment such as digital cameras, electronic notebooks, and PDAs Power supply for audio equipment such as portable CD/MD players Constant voltage power supply for cameras, video equipment, and communications equipment Power supply for microcomputers LR8301 Series Features Low voltage operation: Startup at 0.9 V min. (IOUT = 1 mA) guaranteed Duty ratio: 66/78%, builtin auto switching type PFM controller External parts: Coil, capacitor, diode Output voltage: Settable to between 1.8 to 6.5 V in 0.1 V steps Accuracy...