Allegro MicroSystem's A8499 Step-Down Regulator

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Home > Featured Products > Volume 3 - Allegro A8499 Step-Down Regulator

A8499: High-Voltage Step-Down Regulator

Allegro's A8499 serves as a General Purpose Buck Regulator for Several Applications

The A8499 is a step-down regulator that handles a wide input of operating voltage ranges. It is a fixed off-time current-mode-controlled buck regulator. The regulator requires an external clamping diode, inductor and filter capacitor. The off-time is determined by an external resistor.

It will operate in both continuous and discontinuous modes. An internal blanking circuit will be used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200 nS. The output
voltage is adjustable from 1.2 V to 24 V based on a resistor divider and the 1.2 V 3 percent reference.

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Features
•	8-50 V input range
	-	Very wide input voltage range
•	Integrated DMOS switch
	-	No external FET needed
•	Adjustable fixed off-time
	-	User adjustability
•	Adjustable 1.2-24 V output
	-	User adjustability
•	Flat efficiency curve across output current
	-	Minimal change in efficiency across wide operating range
•	1.5 A output in standard SOIC-8 package
	-	Output current capability in small package with integrated FET
•	Low shutdown current
	-	Maximized battery life and low power drain

Datasheets
•	A8499 High Voltage Step-Down Regulator

Applications
•	Applications with 8 to 50 V input voltage range needing buck regulator for 1.5 A output current
•	Consumer equipment power
•	Uninterruptible power supplies (lead acid battery charger)
•	Automotive: 9 to 16 V input, with higher voltage protection
•	12 V lighter-powered applications (portable DVD, etc.)
•	Point of Sale (POS) applications
•	Industrial applications with 24 V or 36 V bus

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