LTC3589_12 Datasheet, PDF (1/50 Pages) Linear Technology – 8-Output Regulator with Sequencing and I2C

LTC3589/LTC3589-1/
LTC3589-2
8-Output Regulator with
Sequencing and I²C
FEATURES
n _{Triple I}²_{C Adjustable High Efficiency Step-Down DC/}
DC Converters: 1.6A, 1A/1.2A, 1A/1.2A
n _{High Efficiency 1.2A Buck-Boost DC/DC Converter}
n _{Triple 250mA LDO Regulators}
n _{Pushbutton ON/OFF Control with System Reset}
n _{Flexible Pin-Strap Sequencing Operation}
n _I²_{C 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 _{Always-Alive 25mA LDO Regulator}
n _{8μA Standby Current}
n _{40-Pin 6mm × 6mm × 0.75mm QFN}
APPLICATIONS
n _{Handheld Instruments and Scanners}
n _{Portable Industrial Devices}
n _{Automotive Infotainment}
n _{Medical Devices}
n _{High End Consumer Devices}
n _{Multirail Systems}
n _{Supports Freescale i.MX53/51, 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 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 I²C 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
I²C port. System power-on, power-off, and reset functions
are controlled by pushbutton interface, pin inputs, or I²C
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.
TYPICAL APPLICATION
V_IN 2.7V TO 5.5V
0.8V TO V_IN
AT 25mA
0.36V TO V_IN
AT 250mA
1.8V
AT 250mA
VIN
LDO1_STDBY
1μF
1μH
SW1
LDO2
1.5μH
SW2
1μF
LTC3589
LDO3
1.5μH
SW3
1μF
2.8V
AT 250mA
1μF ³
7
LDO4
I²C
ENABLES
PWR_ON
ON
GND
SW4AB
SW4CD
2.7μH
BB_OUT
WAKE
4
STATUS
3589 TA01a
0.5V TO V_IN
AT 1.6A
22μF
0.5V TO V_IN
AT 1A
22μF
0.5V TO V_IN
AT 1A
22μF
1.8V TO 5V
22μF
Start-Up Sequence
0.5V/DIV
WAKE
(1V/DIV)
SW2
LDO3
BB_OUT
SW3
LDO2
SW1
500μs/DIV
3589 TA01b
3589fe
1