原标题：Linear LTCR3589带I2C八输出电源稳压方案

　　Linear 公司的LTCR3589是带时序和I2C的八输出电源稳压器，是ARM和基于ARM处理器以及手提微处理器系统的完整的电源管理解决方案。LTCR3589包括用于核，存储器和SoC的三个同步降压DC/DC转换器，用于I/O的同步降压-升压稳压器，以及三个用于低噪音模拟电源的250mA LDO稳压器。本文介绍了LTCR3589主要特性，方框图以及典型应用电路。

　　LTCR3589：8-Output Regulator with Sequencing and I2C

　　The LTCR3589 is a complete power management solution 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 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 interface, pin inputs, or I2C interface. The LTC3589 supports i.MX, PXA and OMAP processors with eight independent rails at appropriate power levels. Other features include interface signals such as the VSTB pin that toggles between programmed run and standby output voltages on up to four rails simultaneously.

　　The device is available in a low profile 40-pin 6mm × 6mm exposed pad QFN package.

　　LTCR3589主要特性：

　　Triple I2C Adjustable High Efficiency Step-Down DC/DC Converters: 1.6A, 1A, 1A

　　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 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

　　LTCR3589应用：

　　Handheld Instruments and Scanners

　　Portable Industrial Devices

　　Automotive Infotainment

　　Medical Devices

　　High End Consumer Devices

　　Multirail Systems

　　Supports Freescale i.MX, Marvell PXA and Other Application Processors

　　图1。LTCR3589方框图

　　图2。LTCR3589典型应用电路图(1)

　　图3。LTCR3589典型应用电路图(2)