S-8460

Rev.2.0_00 STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8460 The S-8460 is a PWM control CMOS step-up and step-down switching regulator controller which consists of an automatic-selection control circuit for step-up and step-down, a reference voltage circuit, an oscillation circuit, an error amplifier, a phase compensation circuit, etc. The automatic-selection control circuit for step-up and stepdown in PWM control realizes a high performance step-up and stepdown switching regulator operating on one coil. With an external Nchannel power MOS, the S-8460 is ideal for applications requiring high efficiency and a high current output. The S-8460 realizes low ripple, high efficiency and excellent characteristics by featuring a PWM switching controller that can change the duty ratio linearly from 0%, and the optimized error amplifier and phase compensation circuit. „ Features Single-coil, step-up or step-down switching realizes high efficiency. High efficiency is realized by using only N-channel power MOS FET as an external power MOS Synchronous rectification at step-down operation Input voltage : 2.2 to 18.0 V Variable output voltage : Output voltage range 2.5 to 6.0 V Automatic-recovery overload protection circuit Oscillation frequency : 300 kHz Soft-start function set by an external capacitor (CSS) Shutdown function Lead-free products „ Applications Power supplies for portable equipments such as PDAs, electroni...