MAX1633A Datasheet | Maxim Integrated

Description The MAX1630A- MAX1635A are buck-topology, stepdown, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual-/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-pensation networks, and automatic bootstrapping. Up to 96% efficiency is achieved through synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in systemsuspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300k Hz clock cycles. Strong 1A on-board gate drivers ensure fast external n-channel MOSFET switching. These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile munications and pen-entry applications. Asserting the SKIP pin enables fixed-frequency mode for lowest noise under all load conditions. The MAX1630A- MAX1635A include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630A/MAX1632A/MAX1633A/ MAX1635A each contain 12V/120m A linear regulators. The MAX1631A/MAX1634A include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor-divider, and is intended to aid in creating auxiliary voltages other than fixed 12V. The MAX1630A/MAX1631A/MAX1632A contain internal output overvoltage and undervoltage protection features . The MAX1630A family has improved RF immunity over the MAX1630...