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.
Applications include:
- 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