ARD00797

The ARD00797 from Microchip is a MCP16251 single cell boost converter with external UVLO reference design. The MCP16251 device is a compact, high efficiency, fixed frequency, synchronous step-up DC to DC converter. The very low quiescent current makes it ideal for battery-powered applications. This reference design provides an example of how to optimize applications powered from a single AA cell battery by incorporating a ultra low power external undervoltage lockout circuit with hysteresis. The converter will not (re)start if the battery voltage is lower than 1.14V and will stop working if the battery voltage drops below 0.83V. The external ULVO circuit drains approximately 0.1 to 0.4μA before start-up and 1 to 2μA after start-up.

• Input voltage: one AA primary or rechargeable battery
• Output voltage is 3.3V, output current is less than 125mA
• Typical efficiency up to 96%
• Start-up voltage is 1.15V
• Shutdown voltage is 0.83V
• Automatic PFM/PWM operation
• PWM switching frequency is 500KHz

内容

MCP16251 one cell boost converter with external UVLO circuit (ARD00797), Important information sheet.

警告

从外部电源为电路板供电时须小心谨慎.