A8447: High-Voltage Step-Down Regulator

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: December 1, 2015.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A8498SLDTR-T.

The A8447 is a 3 A, high efficiency general-purpose buck regulator designed for a wide variety of applications. The output voltage is adjustable from 0.8 to 24 V, based on a resistor divider and the 0.8 V 3% reference. External components include an external clamping diode, inductor, and filter capacitor. The offtime is determined by an external resistor to ground. It operates in both continuous and discontinuous modes to maintain light load regulation. An internal blanking circuit is used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200 ns.

This device is ideal for various end products including applications with 8 to 50 V input voltage range and require up to 3 A output current, such as uninterruptible power supplies, point of sale (POS) applications, and industrial applications with 24 or 36 V bus.

Applications include:

  • Printer power supplies
  • Office automation equipment
  • POS thermal, laser, photo, and inkjet printers
  • Tape drives
  • Industrial applications
Digi-Key Corporation (Distributor, Allegro & Sanken Semiconductors)
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Email: webmaster@digikey.comSwingtel Communications Private Ltd.(Distributor, Allegro Products)
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Mumbai - 400 002. India.
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  • Wide input voltage range: 8 to 50 V
  • Integrated low RDS(on) DMOS switch
  • 3 A continuous output current
  • Adjustable fixed off-time
  • Highly efficient
  • Adjustable output: 0.8 to 24 V
  • Small package with exposed thermal pad

The A8447 is supplied in  8 pin SOIC with exposed thermal pad (suffix LJ). It is lead (Pb) free, with 100% matte-tin leadframe plating.

LJ SOIC with exposed pad 8 pin

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Functional Block Diagram


型号 封装类型 温度 遵循 RoHS规范 部件 构成/RoHS 数据 评论 样品 分销商库存
A8447SLJTR-T 8-lead SOIC -20°C to 85°C 查看数据 中断 联系本地销售代表 检查库存

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