Description
The A8499 is a step-down regulator that will handle 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.
Reference Design and PCB Gerber Files
- A8499 Schematic(PDF)
- A8499 Gerber File(ZIP)
Schematic and gerber files are for reference only. Users should optimize the PCB layout and components for their specific application. Evaluation Board for A8499 is available upon request. Please contact your local representative.
Functional Block Diagram
Features
- 8-50 V input range
- Integrated DMOS switch
- Flat efficiency curve across output current
- 1.5 A output in standard SOIC-8 package
- Low shutdown current
- Low cost
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
source：ShenZhen henlito electronic co.,ltd.
web:www.henlito.com
