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Linear Technology Electronic Components Datasheet

LTC3589 Datasheet

8-Output Regulator

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Electrical Specifications Subject to Change
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LTC3589
8-Output Regulator with
Sequencing and I2C
FEATURES
n Triple I2C Adjustable High Efficiency Step-Down
Switching Regulators: 1.6A, 1A, 1A
n High Efficiency 1.2A Buck-Boost Switching Regulator
n Triple 250mA LDO Regulators
n Always Alive 25mA LDO Regulator
n Flexible Pin-Strap Sequencing Operation
n I2C and Independent Enable Control Pins
n Power Good and Reset Outputs
n Dynamic Voltage Scaling and Slew Rate Control
n Selectable 2.25MHz or 1.12MHz Switching Frequency
n Pushbutton ON/OFF Control with System Reset
n 10μA Standby Current
n 40-Pin 6mm × 6mm × 0.75mm QFN
APPLICATIONS
n Handheld Instruments and Scanners
n Portable Industrial Devices
n Automotive Infotainment
n Portable Medical Devices
n High End Consumer Devices
n Multirail Systems
n Supports Freescale i.MX, Marvell PXA and Other
Application Processors
DESCRIPTION
The LTC®3589 is a complete power management solu-
tion for ARM and ARM-based processors and advanced
portable microprocessor systems. The device contains
three synchronous step-down DC/DC converters for
core, memory and SoC rails, a synchronous buck-boost
regulator for I/O at 3.3V to 5V, and three 250mA LDO
regulators for low noise analog supplies. An I2C serial port
is used to control regulator enables, output voltage levels,
dynamic voltage scaling and slew rate, operating modes
and status reporting. Regulator start-up is sequenced by
connecting regulator outputs to enable pins in the desired
order or via the I2C port. System power-on, power-off
and reset functions are controlled by pushbutton inter-
face, pin inputs, or I2C interface. The LTC3589 supports
i.MX, PXA and OMAP processors with eight independent
rails at appropriate power levels, dynamic control and
sequencing. Other features include interface signals such
as the VSTB pin that toggles between programmed run
and standby output voltages on up to four rails simultane-
ously. The device is available in a low profile 40-pin 6mm
× 6mm exposed pad QFN package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered
trademarks, Hot Swap and Bat-track are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN 2.7V TO 5.5V
VRTC 1.2V
AT 25mA
MEMORY
0.9V TO 1.2V
AT 250mA
ANALOG 1.8V
AT 250mA
1.8V, 2.5V,
2.8V, 3.3V
AT 250mA
FROM μPROCESSOR
VIN
LDO1_STDBY
SW1
LDO2
LTC3589
SW2
LDO3
SW3
LDO4
3 I2C
7
ENABLES
VSTB
PWR_ON
ON (PB)
SW4AB
SW4CD
BB_OUT
WAKE
PBSTAT
GND
PGOOD
RSTO
3589 TA01a
VCORE
0.6V TO 1.2V
AT 1.6A
VSRAM
0.9V TO 1.8V
AT 1A
DDR
MEMORY
VSOC
0.625V TO 1.25V
AT 1A
HDD
OR I/O
I/O
3.3V AT 1.2A
OR 5V AT 1A
Start-Up Sequence
WAKE
(1V/DIV)
VSRAM
ANALOG
I/O
VSOC
MEMORY
VCORE
500μs/DIV
3589 TA01b
3589p
1


Linear Technology Electronic Components Datasheet

LTC3589 Datasheet

8-Output Regulator

No Preview Available !

LTC3589
www.DataSheet4U.com
TABLE OF CONTENTS
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 .......................................................................................... 8
Pin Functions .....................................................................................................................12
Block Diagram....................................................................................................................14
Operation.......................................................................................................................... 15
Introduction .......................................................................................................................................................... 15
Always-On LDO..................................................................................................................................................... 16
250mA LDO Regulators ........................................................................................................................................ 16
Step-Down Switching Regulators ......................................................................................................................... 18
Buck-Boost Switching Regulator .......................................................................................................................... 22
Slewing DAC Reference Operation........................................................................................................................ 26
Pushbutton Operation........................................................................................................................................... 27
Enable and Power-On Sequencing ........................................................................................................................ 29
Fault Detection, Shutdown, and Reporting............................................................................................................ 30
I2C Operation ........................................................................................................................................................ 32
Thermal Considerations and Board Layout ........................................................................................................... 38
Applications Information .......................................................................................................40
Typical Application ..............................................................................................................42
Package Description ............................................................................................................43
Typical Application ..............................................................................................................44
Related Parts .....................................................................................................................44
3589p
2


Part Number LTC3589
Description 8-Output Regulator
Maker Linear Technology
Total Page 30 Pages
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