数据手册MAX848, MAX849 集成2路ADC,提供精确的电池电压监测 .pdf [英文Rev.2(PDF,176kB)]

{状况:生产中。}

The MAX848/MAX849 boost converters set a new standard of high efficiency and high integration for noise-sensitive power-supply applications, such as portable phones and small systems with RF data links. The heart of the these devices is a synchronous boost-topology regulator that generates a fixed 3.3V output (or 2.7V to 5.5V adjustable output) from one to three NiCd/NiMH cells or one Li-Ion cell. Synchronous rectification provides a 5% efficiency improvement over similar nonsynchronous boost regulators. In standby mode, pulse-skipping PFM operation keeps the output voltage alive with only 150µW quiescent power consumption. Fixed-frequency PWM operation ensures that the switching noise spectrum is limited to the 300kHz fundamental and its harmonics, allowing easy post-filtering noise reduction. For even tighter noise spectrum control, synchronize to a 200kHz to 400kHz external clock. Battery monitoring is provided by a two-channel, voltage-to-frequency analog-to-digital converter (ADC). One channel is intended for a single-cell battery input (0.625V to 1.875V range), while the other channel is for monitoring higher voltages (0V to 2.5V range). Two control inputs are provided for push-on, push-off control via a momentary pushbutton switch. Upon power-up, an internal comparator monitors the output voltage to generate a power-good output (POK). The devices differ only in the current limit of the N-channel MOSFET power switch: 0.8A for the MAX848, and 1.4A for the MAX849.

产品关键特性
  • Up to 95% Efficiency
  • 3.3V Dual Mode™ or 2.7V to 5.5V Adj. Output
  • 0.7V to 5.5V Input Range
  • 0.15mW Standby Mode
  • 300kHz PWM Mode or Synchronizable
  • Two-Channel ADC with Serial Output
  • Power-Good Function
应用与使用范围
  • 蜂窝电话
  • 数字无绳电话
  • 手持式仪表(PDA、掌上电脑)
  • 本地3.3V至5V转换电源
  • 掌上电脑
  • PCS电话
  • 个人通信装置
典型工作电路

芯片订购型号
订购型号产品状态封装形式工作温度RoHS/无铅
MAX848ESE生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:否材料分析
MAX848ESE+生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX848ESE+T生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX848ESE-T生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:否材料分析
MAX849ESE生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:否材料分析
MAX849ESE+生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX849ESE+T生产中SOIC(N);16引脚;61.9mm²封装信息-40°C至+85°CRoHS/无铅:无铅材料分析
MAX849ESE-T生产中N.SO;16引脚封装信息-40°C至+85°C参考数据资料
功能接近器件
MAX7173.3V掌上电脑及闪存存储器电源稳压器
MAX717EVKIT3.3V掌上电脑及闪存存储器电源稳压器
MAX7183.3V掌上电脑及闪存存储器电源稳压器
MAX7223.3V/5V掌上电脑及LCD电源稳压器
MAX7233.3V/5V掌上电脑及LCD电源稳压器
MAX8471节电池、升压型、双向寻呼机系统电源IC
评估板与开发套件
MAX849EVKITMAX848、MAX849评估板
相关芯片型号
MAX849EVKITMAX848、MAX849评估板
MAX848-MAX849.pdf MAX849
典型工作电路 MAX849