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AAT3171

AAT3171

  • 厂商:

    ANALOGICTECH(研诺)

  • 封装:

  • 描述:

    AAT3171 - High Current, High Efficiency Charge Pump with Auto-Timer - Advanced Analogic Technologies

  • 详情介绍
  • 数据手册
  • 价格&库存
AAT3171 数据手册
High Current, High Efficiency Charge Pump with Auto-Timer General Description The AAT3171 is a high output current, high efficiency, low noise, low profile charge pump DC/DC converter. The device is ideal for multi-functional LED photo-flash applications where solution cost, size, and efficiency are critical. The AAT3171 is capable of driving a regulated output current up to 800mA. Output current levels can be easily programmed in 16 steps through AnalogicTech's Simple Serial Control™ (S2Cwire™) interface controlled by a single microcontroller GPIO line. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. The maximum output current can also be set with an external RSET resistor. The tri-mode (1X/1.5X/2X) operation of the internal charge pump offers excellent power efficiency throughout the output current range for both flash and movie modes. Combined with a low external parts count (two 1µF flying capacitors and two small bypass capacitors at VIN and OUT), the AAT3171 is ideally suited for small battery-powered applications. The AAT3171 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3171 is available in a Pb-free, thermallyenhanced 12-pin 3x3mm TDFN package and is specified over the -40°C to +85°C temperature range. AAT3171 Features • • • • • • • • • • ChargePump™ Up to 800mA Output Current Tri-Mode 1X/1.5X/2X in Current Mode 16 Current Level Steps Set by S2Cwire External RSET to Set Maximum Current
AAT3171
1. 物料型号: - AAT3171:高电流、高效率的电荷泵,具有自动定时器功能。

2. 器件简介: - AAT3171是一款高输出电流、高效率、低噪声的电荷泵DC/DC转换器,适用于多功能LED闪光灯应用,具有成本、尺寸和效率的关键优势。能够驱动高达800mA的稳定输出电流,并且具有自动软启动功能和小于1µA的关闭电流。

3. 引脚分配: - VIN(1和12):输入电源引脚,连接到输入电压。 - C1+(2)和C1-(3):飞行电容器C1的正负极。 - GND(4):地连接。 - FL(5):控制的电流汇,连接闪光灯LED阴极。 - RSET(6):连接电阻以设置最大输出电流。 - EN/SET(7):电荷泵使能/设置输入控制引脚。 - CT(8):闪光灯超时电容器,连接0.1pF电容器以实现1秒的闪光灯超时。 - C2-(9)和C2+(10):飞行电容器C2的负极和正极。 - OUT(11):电荷泵输出,连接闪光灯LED阳极以驱动LED。 - EP:暴露的船桨(底部),直接连接到GND。

4. 参数特性: - 输入电压范围:2.7V至5.5V。 - 最大输出电流:1000mA。 - 工作温度范围:-40°C至+85°C。 - 存储温度范围:-65°C至+150°C。 - 最大焊接温度(引脚,10秒):300°C。

5. 功能详解: - AAT3171具有三模式(1X/1.5X/2X)内部电荷泵操作,提供优异的功率效率,适用于闪光灯和电影模式。 - 通过S2Cwire接口控制,可实现16级电流调节。 - 具有热管理系统,在输出引脚短路时保护器件。 - 关闭功能可断开负载与VIN的连接,减少静态电流至小于1µA。

6. 应用信息: - 适用于小型电池供电应用,如摄像机、相机手机、数字相机、PDA和笔记本电脑。 - 可通过连接微控制器或微处理器的GPIO端口到CT引脚,实时实现闪光灯和手电筒模式控制。

7. 封装信息: - AAT3171提供无铅、热增强的12引脚3x3mm TDFN封装,符合-40°C至+85°C的温度范围。
AAT3171 价格&库存

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