A PMIC for Modern Application Processors

A PMIC for Modern Application Processors
VIN 2.7V TO 5.5V
VIN
LDO1_STDBY
SW1
VCORE
0.6V TO 1.2V
AT 1.6A
MEMORY
0.9V TO 1.2V
AT 250mA
LDO2
SW2
VSRAM
0.9V TO 1.8V
AT 1A
ANALOG 1.8V
AT 250mA
LDO3
SW3
VSOC
0.625V TO 1.25V
AT 1A
VRTC 1.2V
AT 25mA
1.8V, 2.5V,
2.8V, 3.3V
AT 250mA
LTC3589
LDO4
3
6mm
5
FROM µPROCESSOR
SW4AB
SW4CD
I2C
I/O
3.3V AT 1.2A
OR 5V AT 1A
BB_OUT
ENABLES
WAKE
VSTB
PBSTAT
PWR_ON
PGOOD
6mm
ON
GND
RSTO
TO µPROCESSOR
QFN-40
3 Bucks + Buck-Boost + 4 LDOs + I2 C Control + Sequencing +
Dynamic Voltage Scaling = A Complete Power Management Solution for
Advanced Application Processor-Based Systems
The LTC®3589/-1/-2 is a complete power management solution for portable processors such as NXP i.MX, PXA, ARM, OMAP
and other advanced portable microprocessor systems. The device features eight independent rails, with dynamic control and
sequencing, in a compact QFN package. These rails supply power to the processor core, SDRAM, system memory, PC cards,
always-on real-time clock (RTC) and a variety of other functions.
LTC3589 Demo Board
Features
Triple I C Adjustable High Efficiency Step-Down DC/DC
Converters: 1.6A, 1A, 1A (1.6A, 1.2A, 1.2A on
LTC3589-1/-2)
High Efficiency 1.2A Buck-Boost DC/DC Converter
Triple 250mA LDO Regulators
Pushbutton On/Off Control with System Reset
Flexible Pin-Strap Sequencing Operation
I2C and Independent Enable Control Pins
Power Good and Power-On Reset Outputs
Dynamic Voltage Scaling and Slew Rate Control
Selectable 2.25MHz or 1.12MHz Switching Frequency
Always Alive 25mA LDO Regulator
8μA Standby Current
40-Pin 6mm × 6mm × 0.75mm QFN Package
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2
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24mm
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Applications
Supports NXP i.MX, Marvell PXA and
Other Application Processors
Handheld Instruments and Scanners
Portable Industrial and Medical Devices
Automotive Infotainment
High End Consumer Devices
Multirail Systems
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27mm
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
VIN
PVIN4
Always-On LDO
BB_OUT
VRTC
AT 25mA
LDO1_STDBY
SW4CD
ALWAYS ON LDO1
Pushbutton
Control
EN
OK
Activates the WAKE
Output, Indicates
Pushbutton Status
via the PBSTAT Pin,
and Initiates a Hard
Reset Shutdown of
the Regulators.
BB_FB
IRQ
PVIN1
ON (PB)
BUCK 1
PBSTAT
WAKE
PWR_ON
EN
SW1
OK
CONTROL + SEQUENCE
VSTB
BUCK1_FB
EN-PINS
EN2
Direct µP Support
PVIN2
EN-I2C
EN3
Power-Up Sequencing,
Dynamic Voltage
Scaling and Slew Rate
Control, Selectable
Switching Frequency,
Marvell Register
Mapping for I2C
Commands and
Dynamic Voltage
Scaling, Freescale
Voltage Standby Pin.
VCORE
AT 1.6A
VREF
DAC
EN1
BUCK 2
EN4
EN_LDO2
EN
EN_LDO34
OK
SW2
VSRAM
AT 1A
VREF
DAC
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Dynamic Output
Voltage Scaling
For Entering Low
Voltage Processor
Standby Modes.
Four Regulators
Transition Between
Two Programmed
DAC Reference
Voltages Controlled
by the VSTB Pin or
I2C Commands at 1
of 4 Programmable
Slew Rates.
BUCK2_FB
DVDD
PVIN3
SDA
I2C
PGOOD
EN
SW3
Control
VSOC
AT 1A
VREF
DAC
RSTO
For Regulator
Enables, Output
Voltage Levels,
Dynamic Voltage
Scaling and Slew
Rate Control,
Operating Modes
and Status
Reporting.
Sync Buck
Regulators
BUCK 3
SCL
OK
I2 C
Sync Buck-Boost
Regulator
For High Efficiency
3.3V or 5V I/O Rails.
SW4AB
VREF
LTC3589
OK
LDO1_FB
I/O AT 1.2A
BUCK-BOOST
VREF
For Keep Alive or
RTC Rails.
7
BUCK3_FB
POWER
GOOD
For High Efficiency
Rails Such as
Core, SRAM and
System On a Chip.
VIN_LDO2
DAC
VREF
LDO2
LDO2
EN
OK
VMEM
AT 250mA
LDO2_FB
Low Noise LDOs
For Various
Noise-Sensitive Rails
VIN_LDO34
LDO4
VREF
EN
OK
EN
OK
LDO4
1.8V, 2.5V, 2.8V, 3.3V
AT 250mA
VREF
LDO3
LDO3
VANALOG 1.8V
AT 250mA
GND (EXPOSED PAD)
Configurable Start-Up Sequence
Dynamic Voltage Scaling with Adjustable
Slew Rates for Bucks and LDO2
200mV/DIV
BUCK1
200mV/DIV
BUCK2
200mV/DIV
BUCK3
200mV/DIV
LDO2
5V/DIV
VSTB
I/O
WAKE
(1V/DIV)
VSRAM
0.5V/DIV
ANALOG
VSOC
MEMORY
VCORE
500µs/DIV
100µs/DIV
www.linear.com/3589 n 1-800-4-LINEAR
0516a
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