• 简体中文
• English

MAX848：1节至3节电池、大功率、低噪声、升压型DC-DC转换器

集成2路ADC，提供精确的电池电压监测

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.

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

MAX848、MAX849：典型工作电路 应用 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

数据手册DataSheet

关键参数

开发工具

• MAX849EVKIT

相关产品

• MAX847：1节电池、升压型、双向寻呼机系统电源IC
• MAX717：3.3V掌上电脑及闪存存储器电源稳压器
• MAX722：3.3V/5V掌上电脑及LCD电源稳压器

订购型号