Linear LT3958输出可正可负DC-DC电源转换方案

Linear 公司的LT3958是宽输入电压（5V-80），电流模式，输出可正可负DC-DC电源转换器，可配置成升压，反激，SEPIC或反相转换器。LT3958集成了84V/3.3A N沟功率MOSFET和7.2V LDO稳压器，可编开关频率100kHz到1MHz，能和外部时钟同步，主要用在汽车，通信和工业领域。本文介绍了LT3958主要特性，方框图，以及多种应用电路图。

The LT3958 is a wide input range, current mode, DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3958 can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin.

A minimum operating supply voltage of 5V, and a low shutdown quiescent current of less than 1μA, make the LT3958 ideally suited for battery-powered systems. The LT3958 features soft-start and frequency foldback functions to limit inductor current during start-up.

LT3958主要特性:

Wide Input Voltage Range: 5V to 80V
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