LTC3589/LTC3589-1/
LTC3589-2
8-Output Regulator with
Sequencing and I
2
C
FEATURES
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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 step-down DC/DC converters for core, memory and
SoC rails, a buck-boost regulator for I/O at 1.8V to 5V and
three 250mA LDO regulators for low noise analog sup-
plies. An I
2
C serial port is used to control enables, output
voltage levels, dynamic voltage scaling, operating modes
and status reporting. Differences between the LTC3589,
LTC3589-1, and LTC3589-2 are summarized in Table 1.
Regulator start-up is sequenced by connecting outputs to
enable pins in the desired order or programmed via the
I
2
C port. System power-on, power-off, and reset functions
are controlled by pushbutton interface, pin inputs, or I
2
C
interface.
The LTC3589 supports i.MX53/51, PXA and OMAP pro-
cessors with eight independent rails at appropriate power
levels. Other features include interface signals such as
the VSTB pin that simultaneously toggle up to four rails
between programmed run and standby output voltages.
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
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Triple I
2
C Adjustable High Efficiency Step-Down DC/
DC Converters: 1.6A, 1A/1.2A, 1A/1.2A
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
I
2
C and Independent Enable Control Pins
Power Good and 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
APPLICATIONS
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Handheld Instruments and Scanners
Portable Industrial Devices
Automotive Infotainment
Medical Devices
High End Consumer Devices
Multirail Systems
Supports Freescale i.MX53/51, Marvell PXA and
Other Application Processors
TYPICAL APPLICATION
V
IN
2.7V TO 5.5V
0.8V TO V
IN
AT 25mA
1μF
0.36V TO V
IN
AT 250mA
1μF
1.8V
AT 250mA
2.8V
AT 250mA
LDO3
1μF
LDO4
1μF
3
7
I
2
C
ENABLES
PWR_ON
ON
GND
SW4AB
SW4CD
BB_OUT
WAKE
STATUS
3589 TA01a
Start-Up Sequence
VIN
LDO1_STDBY
1μH
SW1
22μF
1.5μH
LDO2
LTC3589
1.5μH
SW3
22μF
2.7μH
SW2
22μF
0.5V TO V
IN
AT 1.6A
WAKE
(1V/DIV)
SW2
0.5V/DIV
0.5V TO V
IN
AT 1A
LDO3
SW3
LDO2
SW1
500μs/DIV
1.8V TO 5V
4
22μF
3589 TA01b
BB_OUT
0.5V TO V
IN
AT 1A
3589fe
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
