MAX8745A

19-0839; Rev 0; 6/07 KIT ATION EVALU E L B A AVAIL www.DataSheet4U.com High-Efficiency, Quad Output, Main PowerSupply Controllers for Notebook Computers General Description Features o o o o o o o o o o o o o o Fixed-Frequency, Current-Mode Control 40/60 Optimal Interleaving Internal BST Switches Internal 5V, 100mA Linear Regulator Auxiliary Linear-Regulator Driver (12V or Adjustable Down to 1V) Dual Mode™ Feedback—3.3V/5V Fixed or Adjustable Output Voltages 200kHz/300kHz/500kHz Switching Frequency Undervoltage and Thermal-Fault Protection Overvoltage-Fault Protection (MAX8744A Only) 6V to 26V Input Range 2V ±0.75% Reference Output Independent Enable Inputs and Power-Good Outputs Soft-Start and Soft-Shutdown (Voltage Ramp) 8μA (typ) Shutdown Current MAX8744A/MAX8745A PGOODA LDO5 DL3 DL5 LX3 The MAX8744A/MAX8745A are available in a 32-pin, 5mm x 5mm, thin QFN package. The exposed backside pad improves thermal characteristics for demanding linear keep-alive applications. 24 DH3 25 BST3 26 PGOOD3 27 CSL3 28 CSH3 29 FB3 30 FBA 31 OUTA 32 1 ONA + 23 22 21 20 19 18 17 16 15 14 13 DH5 BST5 PGOOD5 CSL5 CSH5 FB5 SKIP FSEL Applications Main Power Supplies 2 to 4 Li+ Cell Battery-Powered Devices Notebook and Subnotebook Computers PDAs and Mobile Communicators MAX8744A MAX8745A LX5 TOP VIEW PGND The MAX8744A/MAX8745A are dual step-down, switchmode, power-supply (SMPS) controllers with synchronous rectification, intended for main 5V/3.3V power generation in battery-...