MAX8742EAI+

Price range: $9.46 - $11.02

The MAX8741/MAX8742 are buck-topology, step-down,switch-mode, power-supply controllers that generatelogic-supply voltages in battery-powered systems. Thesehigh-performance, dual/triple-output devices include onboardpower-up sequencing, power-good signaling withdelay, digital soft-start, secondary winding control, lowdropoutcircuitry, internal frequency-compensation networks,and automatic bootstrapping.Up to 97% efficiency is achieved through synchronousrectification and Maxim's proprietary Idle Mode™ controlscheme. Efficiency is greater than 80% over a 1000:1load-current range, which extends battery life in systemsuspend or standby mode. Excellent dynamic responsecorrects output load transients within five clock cycles.Strong 1A on-board gate drivers ensure fast externaln-channel MOSFET switching.These devices feature a logic-controlled and synchronizable,fixed-frequency, pulse-width-modulation (PWM)operating mode. This reduces noise and RF interferencein sensitive mobile communications and pen-entry applications.Asserting the active-low SKIP pin enables fixed-frequencymode, for lowest noise under all load conditions.The MAX8741/MAX8742 include two PWM regulators,adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3Vmodes. All these devices include secondary feedbackregulation, and the MAX8742 contains a 12V/120mA linearregulator. The MAX8741 includes a secondary feedbackinput (SECFB), plus a control pin (STEER) thatselects which PWM (3.3V or 5V) receives the secondaryfeedback signal. SECFB provides a method for adjustingthe secondary winding voltage regulation point with anexternal resistor-divider, and is intended to aid in creatingauxiliary voltages other than fixed 12V.The MAX8741/MAX8742 contain internal output overvoltage-and undervoltage-protection features.ApplicationsDesktop CPU Local DC-DC ConvertersNotebook and Subnotebook ComputersPDAs and Mobile Communicators