LTC3216

• Product Introduction

LTC3216

1A low-noise, high-current LED charging pump with independent flashlight/flash current control

peculiarity

• 高效操作：具自动模式切换功能的 1x、1.5x 或 2x 升压模式
• 超低压差 I_LED 电流控制
• 输出电流高达 1A
• 低噪声恒定频率操作
• 独立的低电流/高电流设置和使能引脚
• 宽 V_IN 范围：2.9V 至 4.4V
• 开路/短路 LED 保护
• 在停机模式中实现了 LED 断接
• 低停机电流：2.5uA
• LED 电流设置准确度：4%
• 自动软起动功能限制了浪涌电流
• 无电感器
• 纤巧型应用电路 (所有元件的高度均
• 3mm x 4mm 12 引脚 DFN 封装

description

The LTC®3216 is a low-noise, high-current charge pump DC/DC converter designed for powering high-current LEDs. The device includes an accurate settable current source capable of driving loads up to 1A from a single 2.9V to 4.4V input. The low number of external components (two jumper capacitors, two programmed resistors, and two bypass capacitors on the VIN and CPO pins) makes the LTC3216 ideal for small, battery-powered applications. The built-in soft-start circuit prevents excessive inrush current during start-up. The high switching frequency allows for the use of small external capacitors. Independent high and low current setpoints are set by two external resistors. The shutdown mode and current output level are selected via two logic inputs. An ultra-low dropout current source maintains accurate LED current at very low ILED voltages. The automatic mode switching feature optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when an ILED dropout is detected. LTC3216 is available in a small 3mm x 4mm 12-pin DFN package

apply

• 蜂窝电话、PDA 和数码相机的 LED 手电筒/相机照明灯电源
• 普通照明和/或闪光灯/频闪观测器应用
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