BQ25123中文资料700nA 低 IQ 高度集成式电池充电管理解决方案数据手册TI规格书

描述 Description

The BQ25123 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization. A simple voltage based monitor provides battery level information to the host in 2% increments from 60% to 100% of the programmed V(BATREG).

特性 Features

• Increases system operation time between charges
• 700-nA (typical) Iq with buck converter enabled (no load)
• Configurable load switch or 100-mA LDO output
• 0.5% accurate battery voltage regulation (configurable from 3.6 V to 4.65 V in 10-mV steps)
• Configurable termination current down to 500 µA
• Simple voltage based battery monitor
• Highly integrated solution with small footprint
• Push-button wake-up and reset with adjustable timers
• Power path management for powering the system and charging the battery
• Power path management enables
• Dedicated pins for input current limit, charge current, termination current, and status output
• I2C communication control
• Termination threshold
• VINDPM threshold
• Load switch control
• System output voltage adjustment
• LDO output voltage adjustment