LTC3675

• Product Introduction

LTC36757-channel, configurable high-power PMIC

peculiarity

• 4 个单片式、同步降压型 DC/DC (1A / 1A / 500mA / 500mA)
• 可以把降压型 DC/DC 并联起来，以与单个电感器一道提供高达 2x 电流
• 独立的 1A 升压和 1A 降压-升压型 DC/DC
• 两串 I²C 控制型 40V LED 驱动器
• 可通过 I²C 来设置所有 DC/DC 输出电压、操作模式和开关节点转换速率
• DC/DC、LED 驱动器、故障状态的 I²C 回读
• I²C 可编程 V_IN 和芯片温度警报
• 可屏蔽的中断以用于报告 DC/DC、V_IN 和芯片温度故障
• 按钮 ON / OFF / 复位
• 始终保持接通的 25mA LDO
• 低静态电流：16μA (所有的 DC/DC 均关断)
• 4mm x 7mm x 0.75mm 44 引脚 QFN 封装
•  

description

The LTC®3675 is a digitally programmable, high-efficiency, multi-output power supply and two-string LED driver IC optimized for high-power single-cell Li-ion/Li-polymer battery applications. DC/DC includes 4 synchronous step-down converters (1A / 1A / 500mA / 500mA), 1 synchronous step-up DC/DC (1A), and 1 buck-boost DC/DC (1A), all powered by a single 2.7V to 5.5V input. The 40V LED driver is capable of regulating up to 25mA of current flowing through two strings of LEDs, each containing up to 10 LEDs. The LED driver can also be configured as a general-purpose high-voltage boost converter.

DC/DC enable, output voltage, switching slew rate, and operating mode can all be set individually via I2C or used in a single mode with simple I/O and power-up defaults. Step-down DC/DC can be used alone or in parallel to provide a higher output current with a common inductor. LED enablement, 60dB brightness control, and grayscale increase or decrease are set using I2C. Alarm levels for low VIN and high chip temperature can also be set via I2C and utilize a shieldable interrupt output to monitor for DC/DC and system failures.

Push-button ON/OFF/reset control and a power-on reset output provide flexibility and reliable power-on sequencing. LTC3675 is available in a low-profile (0.75mm high), thermally enhanced 44-pin 4mm x 7mm QFN package.  

apply

• 高功率 (5W 至 10W) 单节锂离子 / 锂聚合物电池应用
• 便携式工业应用、手持式终端、便携式仪器
• 多输出低电压电源