Maxim MAX866x电源管理(PMIC)方案
Maxim公司的MAX8662/MAX8663是高效小型的电源管理集成电路(PMIC),主要用在智能手机,PDA,互联网设备和其它手持设备. MAX8662/MAX8663集成了两个同步降压稳压器(效率95%),能驱动2-7个白光LED的1MHz升压稳压器,四个低压降(LDO)线性稳压器以及用于单节锂离子电池的线性充电器.输入电压1.7V到5.5V,也可适配器或USB输入.本文介绍了MAX8662/MAX8663的主要特性,方框图和应用电路图以及所用元件列表.The MAX8662/MAX8663 power-management ICs (PMICs) are efficient, compact devices suitable for smart cellular phones, PDAs, Internet appliances, and other portable devices. They integrate two synchronous buck regulators, a boost regulator driving two to seven
white LEDs, four low-dropout linear regulators (LDOs), and a linear charger for a single-cell Li-ion (Li+) battery.
Maxim’s Smart Power Selector (SPS) safely distributes power between an external power source (AC adapter, auto adapter, or USB source), battery, and the system load. When system load peaks exceed the external source capability, the battery supplies supplemental current. When system load requirements are small, residual power from the external power source charges the battery. A thermal-limiting circuit limits battery-charge rate and external power-source current to prevent overheating. The PMIC also allows the system to operate with no battery or a discharged battery.
The MAX8662 is available in a 6mm x 6mm, 48-pin thin QFN package, while the AX8663, without the LED driver, is available in a 5mm x 5mm, 40-pin thin QFN package.
MAX8662/MAX8663主要特性:
Two 95%-Efficient 1MHz Buck Regulators
Main Regulator: 0.98V to VIN at 1200mA
Core Regulator: 0.98V to VIN at 900mA
1MHz Boost WLED Driver
Drives Up to 7 White LEDs at 30mA (max)
PWM and Analog Dimming Control
Four Low-Dropout Linear Regulators
1.7V to 5.5V Input Range
15μA Quiescent Current
Single-Cell Li+ Charger
Adapter or USB Input
Thermal-Overload Protection
Smart Power Selector (SPS)
AC Adapter/USB or Battery Source
Charger-Current and System-Load Sharing
MAX8662/MAX8663应用:
Smart Phones and PDAs
MP3 and Portable Media Players
Palmtop and Wireless Handhelds
图1.MAX8662/MAX8663典型工作电路
图2.MAX8662/MAX8663方框图和应用电路
图3. 热敏电阻输入电路图
外接元件列表:
相关推荐
在线研讨会
焦点