A8439集成电路（IC）的电源管理-专用规格书PDF中文资料

A8439属于集成电路（IC）的电源管理-专用。由Allegro MicroSystems制造生产的A8439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。

Description

The A8439 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. An integrated MOSFET switch drives the transformer in a flyback topology. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space.

The CHARGE pin enables the A8439 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8439 stops the charging until the CHARGE pin is toggled again, or when output voltage falls below 90 of the designated value. Pulling the CHARGE pin low stops the charging. The DONE pin is an open-drain indicator of when the designated output voltage is reached.

Features and Benefits

▪ Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries

▪ Adjustable output voltage

▪ Auto-refresh

▪ >75 efficiency

▪ Eight-level, digitally-programmable current limit

▪ Charge complete indication

▪ Integrated IGBT driver with trigger

▪ No primary-side Schottky diode needed

▪ Low-profile package (0.75 mm nominal height)

Applications include the following:

▪ Digital camera flash

▪ Film camera flash

▪ Cell phone flash

▪ Emergency strobe light