LT3383 Multioutput Power Management Solution with 4 Buck Switching and 3 LDO Linear Regulators FEATURESDESCRIPTION n Quad Adjustable High Efficiency Step-Down The LT®3383 is a complete power management solution DC/DC Converters: 2.5A, 2.5A, 1.5A, 1.5A for advanced portable application processor-based sys- n Three 300mA LDO Regulators (Two Adjustable) tems. The device contains four synchronous step-down n Independent Enable Pin-Strap Sequencing DC/DC converters for core, memory, I/O, and system on- n Power Good chip (SoC) rails and three 300mA LDO regulators for low n 2.25MHz Switching Frequency noise analog supplies. n 12µA Standby Current Regulator start-up is sequenced by connecting outputs to n 150°C TJ Operation (LT3383H) enable pins in the desired order. A master power-on pin n Side Wettable 40-Lead 6mm × 6mm QFN Package is provided to initiate pin-strapped power-on sequences. A status pin is available to indicate regulator undervoltages. APPLICATIONS If an overtemperature or low supply fault is detected all n Automotive regulators are disabled during the fault condition. n Industrial The device is available in a 40-lead 6mm × 6mm QFN with n Communications wettable flanks for optical inspection. n General Purpose Multichannel Power Supplies All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 1µH Start-Up Sequence SW1 2.5A 2.7V TO 5.5V VIN 1.7V TO VIN VIN_L1 FB_B1 47µF PWR_ON 300mA LDO1 5V/DIV LDO1 LT3383 1µF FB_L1 LDO2 1µH 1V/DIV SW2 2.5A BUCK1 AND BUCK2 BUCK3 FB_B2 47µF 1.7V TO V BUCK4 IN VIN_L2 1V/DIV 300mA LDO2 1µH 1ms/DIV 3383 TA01b 1µF FB_L2 SW3 1.5A FB_B3 47µF 1.8V TO VIN VIN_L3 1.8V 1µH 300mA LDO3 SW4 1.5A 1µF 7 FB_B4 47µF ENABLES PWR_ON PGOOD 3383 TA01a Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Power On Sequencing Fault Detection and Reporting Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts
