AAT3166

AAT3166

  • 厂商:

    ANALOGICTECH(研诺)

  • 封装:

  • 描述:

    AAT3166 - High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications - Advanced Analogic Tech...

  • 详情介绍
  • 数据手册
  • 价格&库存
AAT3166 数据手册
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description The AAT3166 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3166 is capable of driving four LEDs for a total of 108mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUTCP) make this part ideally suited for small, battery-powered applications. AnalogicTech's AS2Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA. For optimized efficiency, low-current settings require only 50µA of housekeeping current. Each output of the AAT3166 is equipped with builtin protection for output short-circuit and auto-disable for load short-circuit condition. Built-in softstart circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from the input and reduces quiescent current to less than 1µA. The AAT3166 is available in a Pb-free, space saving, 3×3mm TDFN33-12 package and is rated over the -40°C to +85°C temperature range. AAT3166 Features • • ChargePump™ • • • • • • • • • • • VIN Range: 2.7V to 5.5V Fully Programmable Current with Single Wire — 16-Step Logarithmic Scale — 14/18/27mA Max Current — Four Low-Current Settings Down to 115µA — Low IQ (50µA) for Single-Channel, LowCurrent Mode Tri-Mode 1X, 1.5X, 2X Charge Pump for Maximum Efficiency and VF Coverage Drives Up to Four LEDs Individual Main-Sub (3-1) Group Control No Inductors, Low Noise Operation 1MHz Constant Switching Frequency Small Application Circuit Built-In Thermal Protection Built-In Auto-Disable for Open Circuit Automatic Soft Start IQ
AAT3166
1. 物料型号: - 型号:AAT3166 - 描述:高效率1X/1.5X/2X电荷泵,适用于白光LED应用。

2. 器件简介: - AAT3166是一款低噪声、恒定频率的电荷泵DC/DC转换器,采用三模负载开关(1X)、分数(1.5X)和倍增(2X)转换,以最大化白光LED应用的效率。该器件能够从2.7V至5.5V的输入电压中为四个LED提供总共108mA的电流。电流汇可以单独或并行操作,以驱动更高电流的LED。外部零件数量低(两个1µF的飞行电容器和两个小的1µF电容器在IN和OUTCP之间),使其非常适合小型、电池供电的应用。

3. 引脚分配: - 1号引脚:D4,第四个电流汇输入。 - 2号引脚:EN/SET,AS2Cwire串行接口控制引脚。 - 3号引脚:C1+,飞行电容器1正极,需在C1+和C1-之间连接1pF电容器。 - 4号引脚:C1-,飞行电容器1负极。 - 5号引脚:OUTCP,电荷泵输出以驱动负载电路,需在此引脚和地之间连接微法拉电容器。 - 6号引脚:C2+,飞行电容器2正极,需在C2+和C2-之间连接1pF电容器。 - 7号引脚:C2-,飞行电容器2负极。 - 8号引脚:IN,输入电源供应,需在此引脚和地之间连接1uF电容器。 - 9号引脚:GND,地。 - 10号引脚:D1,第一个电流汇输入。 - 11号引脚:D2,第二个电流汇输入。 - 12号引脚:D3,第三个电流汇输入。 - EP引脚:暴露的垫;尽可能接近地连接到地以包络。

4. 参数特性: - 输入电压范围:2.7V至5.5V。 - 完全可编程电流,单线控制。 - 三模1X、1.5X、2X电荷泵,最大效率和Vf覆盖。 - 可驱动高达四个LED。 - 独立的主从(3-1)组控制。 - 无需电感器,低噪声操作。 - 1MHz恒定开关频率。 - 内置热保护。 - 内置自动禁用功能,用于开路自动软启动。 - 关闭时I0小于1uA。

5. 功能详解: - AAT3166是三模负载开关(1X)和高效率(1.5X或2X)电荷泵器件,针对白光LED背光应用。内部传感电路监控每个恒定电流汇输入所需的电压,并根据输入电池电压和电流汇输入电压设置负载开关和电荷泵模式。随着电池放电,当任何四个电流汇输入接近 dropout 时,AAT3166电荷泵被启用。电荷泵最初以1.5X模式启动。如果电荷泵输出下降足够多,以至于任何电流源输出接近dropout,电荷泵将自动转换为2X模式。

6. 应用信息: - 适用于RGB照明、可编程电流汇、透射式LCD显示、白光LED背光、数字相机的白光照片闪光灯等应用。
AAT3166 价格&库存

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