Description

The Allegro®A8437 Xenon photoflash charger IC is designed to meet the needs of ultra-low power, small form factor cameras, particularly camera-phones.

The charge current time is adjustable by setting the charge current limit from 0.4 to 1.2 A maximum. By using primaryside voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. This has the additional benefit of reducing leakage currents on the secondary side of the transformer. To extend battery life, the A8437 features very low supply current draw—typically 0.1 μA in shutdown mode and 10 μA in standby mode.

Features and Benefits

▪ Low quiescent current draw (0.1 μA in shutdown mode)

▪ Primary-side output voltage sensing; no resistor divider

required

▪ User-adjustable current limit from 0.4 to 1.2 A

▪ 1.1 V logic (VHI(min)) compatibility

▪ Integrated IGBT driver with separate sink and source (CG

package) or common sink/source (EJ package)

▪ Flash dual trigger with interlock for increased noise

immunity

▪ Optimized for mobile phone, 1-cell Li+ battery applications

▪ No primary-side Schottky diode needed

▪ Zero-voltage switching for lower loss

▪ >75 efficiency

▪ Optional regulation feature to maintain the output voltage

▪ Charge complete indication

▪ Integrated 40 V DMOS switch

A8437ECGLT属于集成电路（IC） > 电源管理 - 专用。Allegro MicroSystems制造生产的A8437ECGLT电源管理 - 专用专用型电源管理集成电路 (PMIC) 用于电源的控制或操作，适合特定或小范围的目标应用，例如汽车气囊管理、电容器组平衡、AC 公共电力监控、存储器总线端接、接地故障检测、能量收集、小型引擎管理、处理器或芯片集专用电压调节、负载突降保护、触觉驱动器、热电制冷器控制等。