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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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°C | RoHS/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
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