MAX1631A

www.DataSheet4U.com 19-3518; Rev 1; 8/05 KIT ATION EVALU E L B A IL AVA Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers ____________________________Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ 96% Efficiency +4.2V to +30V Input Range 2.5V to 5.5V Dual Adjustable Outputs Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™) 12V Linear Regulator Adjustable Secondary Feedback (MAX1631A/MAX1634A) 5V/50mA Linear Regulator Output Precision 2.5V Reference Output Programmable Power-Up Sequencing Power-Good (RESET) Output Output Overvoltage Protection (MAX1630A/MAX1631A/MAX1632A) Output Undervoltage Shutdown (MAX1630A/MAX1631A/MAX1632A) 200kHz/300kHz Low-Noise, Fixed-Frequency Operation Low-Dropout, 99% Duty-Factor Operation 2.5mW Typical Quiescent Power (+12V Input, Both SMPSs On) 4µA Typical Shutdown Current 28-Pin SSOP Package ________________General 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-compensation 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 ra...