概览

优势和特点
产品详情

优势和特点

提供了针对 DC/DC 转换器和负载的反向电池保护功能
高效率：可达 94%
能从一个 1.8V 输入产生 5V/175mA 输出
可在 1.8V 至 5.5V 的输入电源范围内操作
2V 至 6V 的可调输出电压
在启动期间浪涌电流处于受控状态
在停机模式中提供了输出断接功能
低噪声 1.2MHz PWM 操作
采用纤巧型外部组件
自动突发模式 (Burst Mode^®) 操作 (LTC3499)
在轻负载条件下执行连续开关操作 (LTC3499B）
具过压保护功能
8 引脚 (3mm x 3mm x 0.75mm) DFN 和 MSOP 封装

产品详情

LTC^®3499 / LTC3499B 是同步、固定频率、升压型 DC/DC 功率转换器，具有集成反向电池保护电路，可以在电池极性接反时对器件和负载实施保护和断接，并在小型 (3mm x 3mm) DFN 封装中实现了高效率。真正的输出断接功能消除了浪涌电流，并在停机模式中提供了零负载电流。

这些器件具有一个 1.8V 至 5.5V 的输入电压范围，因而可在采用两节碱性电池或 NiMH (镍氢) 电池的情况下正常运作。开关频率在内部设定为 1.2MHz，从而允许使用纤巧的表面贴装型电感器和电容器。只需数目极少的外部组件即可产生 2V 至 6V 的输出电压。LTC3499 具有自动突发模式操作功能，用于在轻负载条件下提升效率，而 LTC3499B 则在轻负载条件下执行连续开关操作。

软起动时间可通过一个小电容器在外部进行编程。抗振铃电路通过在不连续操作模式中对电感器进行阻尼来降低 EMI 辐射。这些器件具有 <1μA 的停机电源电流和集成过压保护电路，并采用 8 引脚 (3mm x 3mm) DFN 和 8 引脚 MSOP 封装。

Applications

医疗设备
数码相机
MP3播放器
手持式仪器

产品分类

电源管理
- 微功耗升压稳压器
- 内部电源开关升压稳压器

领域

工业自动化技术 (IAT)
- 状态监控

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产品生命周期推荐新设计使用

本产品已上市。数据手册包含所有最终性能规格和工作条件。ADI公司推荐新设计使用这些产品。

评估套件 (2)

DC849B

LTC3499BEDD Demo Board | Reverse Batt Protection, 1.8V ≤ V_IN ≤ 3V or 4.2V, V_OUT = 3.3V @ up to 500mA or V_OUT = 5V @ up to 480mA

DC849A

LTC3499EDD Demo Board | Reverse Batt Protection, 1.8V ≤ V_IN ≤ 3V or 4.2V, V_OUT = 3.3V @ up to 250mA or V_OUT = 5V @ up to 170mA

DC849B

查看此评估套件详细信息

Demonstration circuit 849B is a 750mA, 1.2MHz Synchronous Boost Converter with Reverse Battery Protection featuring the LTC3499BEDD. The LTC3499"B" has Burst Mode disabled and will continuously switch at light loads. The demo board demonstrates a DC/DC boost converter, with a 750mA switch current limit, providing a jumper-selectable 3.3V output at 250mA from a two cell input voltage, or a 5V output at 170mA from either a two cell or a Li-ion battery.The input range is 1.8V to 3V when the output is 3.3V and the output current can be up to 500mA depending on the input voltage. The input range is 1.8V to 4.2V when the output is 5V and the output current can be as high as 480mA.

The LTC3499BEDD offers integrated reverse battery protection up to –6V for both the part and the load, drawing typically less than 1µA of current.

DC849A

查看此评估套件详细信息

Demonstration circuit 849A is a 750mA, 1.2MHz Synchronous Boost Converter with Reverse Battery Protection featuring the LTC3499EDD. The demo board demonstrates a DC/DC boost converter, with a 750mA switch current limit, providing a jumper-selectable 3.3V output at 250mA from a two cell input voltage, or a 5V output at 170mA from either a two cell or a Li-ion battery.The input range is 1.8V to 3V when the output is 3.3V and the output current can be up to 500mA depending on the input voltage. The input range is 1.8V to 4.2V when the output is 5V and the output current can be as high as 480mA.

The LTC3499EDD offers integrated reverse battery protection up to –6V for both the part and the load, drawing typically less than 1uA of current.