A8498 Wide Input Voltage 3.0 A Step Down Regulator
Allegro expands their current family of step-down regulators by adding a 3 A fixed-off-time, current-mode-controlled buck-switching regulator. This general-purpose buck regulator is targeted at the consumer electronics and industrial markets. This new device can be used in a wide variety of applications; the 8 to 50V input range makes it ideal where a wide range of input voltages may occur.
Allegro’s A8498 can handle a wide input of operating voltage ranges. The regulator requires an external clamping diode, inductor, and filter capacitor, and 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, and the output voltage is adjustable from 0.8 to 24V based on a resistor divider and the 0.8V +/- 3% reference.
This device is ideal for various end products including applications with 8 to 50V input voltage range needing a buck regulator for 3 A output current, consumer equipment power, uninterruptible power supplies, 12V lighter-powered applications (portable DVD, etc.), automotive 12V or 24V input applications with higher voltage protection, point of sale (POS) applications, and industrial applications with 24 or 36V bus.
- 8 to 50 V input range
- Integrated DMOS switch
- Adjustable fixed off-time
- Highly efficient
- Adjustable 0.8 to 24 V output
Applications:
- Applications with 8 to 50V Input Voltage Range Needing Buck Regulator for 3.0 A Output Current
- Consumer Equipment Power
- Uninterruptible Power Supplies (lead acid battery charger)
- Automotive Telematics: 9 to 16V input, with higher voltage protection
- 12V Lighter-Powered Applications (portable DVD, etc.)
- Point of Sale (POS) Applications
- Industrial applications with 24 or 36V bus