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Related Links:

Datasheets:
A8447: High-Voltage Step-Down Regulator (PDF)

Selection Guides:
Power Integrated Circuits,

Power Management ICs: Switching Regulators

when this product is updated

A8447
High-Voltage Step-Down Regulator

Features

• Wide input voltage range: 8 to 50 V
• Integrated low R_DS(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

Applications

• Printer power supplies
• Office automation equipment
• POS thermal, laser, photo, and inkjet printers
• Tape drives
• Industrial applications

Description

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 new 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.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8447SLJ-T	8-lead SOT	Yes	view data	-20 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
A8447SLJTR-T	8-lead SOT	Yes	view data	-20 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.