LTC3589/LTC3589-1/ LTC3589-2 8-Output Regulator with 2 Sequencing and I C Fea T Descrip T 2 n Triple I C Adjustable High Efficiency Step-Down DC/ The LTC 3589 is a complete power management solu- tion for ARM and ARM-based processors and advanced DC Converters: 1.6A, 1A/1.2A, 1A/1.2A n portable microprocessor systems. The device contains High Efficiency 1.2A Buck-Boost DC/DC Converter n three step-down DC/DC converters for core, memory and Triple 250mA LDO Regulators n SoC rails, a buck-boost regulator for I/O at 1.8V to 5V and Pushbutton ON/OFF Control with System Reset n three 250mA LDO regulators for low noise analog sup- Flexible Pin-Strap Sequencing Operation 2 2 n plies. An I C serial port is used to control enables, output I C and Independent Enable Control Pins n voltage levels, dynamic voltage scaling, operating modes Power Good and Reset Outputs n and status reporting. Differences between the LTC3589, Dynamic Voltage Scaling and Slew Rate Control LTC3589-1, and LTC3589-2 are summarized in Table 1. n Selectable 2.25MHz or 1.12MHz Switching Frequency n Always-Alive 25mA LDO Regulator Regulator start-up is sequenced by connecting outputs to n 8A Standby Current enable pins in the desired order or programmed via the n 2 40-Pin 6mm 6mm 0.75mm QFN I C port. System power-on, power-off, and reset functions 2 are controlled by pushbutton interface, pin inputs, or I C a T interface. n Handheld Instruments and Scanners The LTC3589 supports i.MX53/51, PXA and OMAP pro- n Portable Industrial Devices cessors with eight independent rails at appropriate power n Automotive Infotainment levels. Other features include interface signals such as n Medical Devices the VSTB pin that simultaneously toggle up to four rails n High End Consumer Devices between programmed run and standby output voltages. n Multirail Systems The device is available in a low profile 40-pin 6mm 6mm n Supports Freescale i.MX53/51, Marvell PXA and exposed pad QFN package. Other Application Processors L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T V 2.7V TO 5.5V Start-Up Sequence IN 1H V IN 0.8V TO V 0.5V TO V IN IN SW1 LDO1 STBY AT 25mA AT 1.6A BB OUT 22F 1F WAKE 1.5H 0.5V TO V 0.36V TO V (1V/DIV) IN IN SW2 LDO2 AT 1A AT 250mA 22F 1F SW2 LTC3589 LDO3 0.5V/DIV 1.5H 1.8V 0.5V TO V IN LDO3 SW3 AT 250mA AT 1A SW3 1F 22F LDO2 2.8V LDO4 2.7H AT 250mA SW1 3 SW4AB 1F 2 I C SW4CD 7 3589 TA01b 500s/DIV ENABLES BB OUT 1.8V TO 5V PWR ON WAKE 22F 4 ON STATUS GND 3589 TA01a 3589fh 1 For more information www.linear.com/LTC3589 ion pplica ions pplica ion uresLTC3589/LTC3589-1/ LTC3589-2 Table o F c T Ts Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Pin Configuration ................................................................................................................. 3 Order Information ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 9 Pin Functions .....................................................................................................................13 Block Diagram ....................................................................................................................15 Operation..........................................................................................................................16 Introduction .......................................................................................................................................................... 16 LTC3589, LTC3589-1, and LTC3589-2 Functional Comparison ............................................................................. 17 Always-On LDO ..................................................................................................................................................... 17 Step-Down Switching Regulators ......................................................................................................................... 20 Buck-Boost Switching Regulator .......................................................................................................................... 24 Slewing DAC Reference Operation ........................................................................................................................ 28 Pushbutton Operation ........................................................................................................................................... 29 Enable and Power-On Sequencing ........................................................................................................................ 31 Fault Detection, Shutdown, and Reporting ............................................................................................................ 32 2 I C Operation ........................................................................................................................................................ 36 Thermal Considerations and Board Layout ........................................................................................................... 42 Typical Application ..............................................................................................................46 Package Description ............................................................................................................48 Revision History .................................................................................................................49 Typical Application ..............................................................................................................50 Related Parts .....................................................................................................................50 3589fh 2 For more information www.linear.com/LTC3589 en on