MAX1687 - 升压型DC-DC转换器，提供精密的自适应限流，用于GSM

MAX1687是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1687是升压型DC-DC转换器，提供精密的自适应限流，用于GSM，本站介绍了MAX1687的封装应用图解、特点和优点、功能等，并给出了与MAX1687相关的Maxim元器件型号供参考。

MAX1687 - 升压型DC-DC转换器，提供精密的自适应限流，用于GSM - DC-DC开关调节器 - 能够使GSM电池的峰值电流降低6倍，可消除发射过程中的DC-DC电源噪声，用户可选择禁止 - 美信半导体

产品概述

The MAX1687/MAX1688 step-up DC-DC converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slowly charging a reservoir capacitor, which supplies the necessary peak energy for the load current burst. As a result, the peak battery current is limited, thus maximizing battery life and minimizing battery voltage sag and transient dips.

An internal synchronous rectifier provides over 90% conversion efficiency and eliminates the need for an external Schottky diode. A logic shutdown mode reduces the shutdown current to only 3µA. The devices can be disabled during current bursts (RF transmit mode) to eliminate switching noise.

The switching frequency of the MAX1687/MAX1688, controlled by the selected inductor, can exceed 1MHz. Two external resistors set the output voltage from 1.25V to 6V. The MAX1687 controls peak battery current, while the MAX1688 features a more advanced, adaptive constant-recharge-time algorithm that maximizes battery life. The MAX1687/MAX1688 are available in thin 16-pin TSSOP (1.1mm max height) or standard 8-pin SO packages.

关键特性

以下关键特性由Maxim美信半导体提供：

Low 450mA Peak Battery Current Provides 2A, 5V GSM Burst

90% Efficiency

Internal Power MOSFETs and Current-Sense Resistor

Output Disconnects from Input During Shutdown

3µA Shutdown Current

Precise Voltage-Controlled Current Limit (MAX1687)

Adaptive Constant-Recharge-Time Capability (MAX1688)

1.25V to 6V Adjustable Output

2.7V to 6V Input Range (1 Li-Ion cell or 3 NiMH cells)

Switching Frequency Can Exceed 1MHz

Standby Mode Disables DC-DC During Transmission Burst

Low Inrush Current at Start-Up

热门应用

GSM电话

PC卡(PCMCIA)

无线手机

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