OB21081/A DC-DC Converter

The OB21081/A is a high-efficiency step-down DC-DC converter that accepts up to 120 V input. A self-adjusting constant-on-time (COT) architecture keeps the CCM switching frequency almost constant across the input range, while frequency modulation on load steps gives fast dynamic response. An internal analog ripple-injection circuit removes the need for an external compensation network and holds the output stable over the full load range. Protection covers over-current and over-temperature, input undervoltage and overvoltage, and output short circuit.

Key Features

• Up to 120 V maximum operating input voltage
• ±2% feedback voltage accuracy
• Input undervoltage and overvoltage protection
• Output short-circuit protection
• Over-temperature and over-current protection
• Output current set by the external MOSFET on-resistance
• Enable pin with delayed shutdown

Applications

• E-bikes and scooters
• Balance wheels
• General-purpose high-voltage step-down rails

Part Numbers

• OB21081

Product family: On-Bright official page