Analog Devices / Maxim Integrated

MAX8640Y/MAX8640Z Step-Down DC-DC Converters

Delivering 500 mA with over 93% efficiency, Analog Devices offers the industry's smallest size and most robust step-down DC-DC converters currently on the market

Image of Analog Devices' MAX8640Y/MAX8640Z Step-Down DC-DC ConvertersAnalog Devices' MAX8640Y/MAX8640Z step-down converters are optimized for applications where small size, high efficiency, and low output ripple are most important. The product utilizes a proprietary PWM control scheme that optimizes the switching frequency for high efficiency with the use of small external components and will maintain low output ripple voltage at all loads. The MAX8640Z switches at up to 4 MHz to allow a tiny 1 µH inductor and 2.2 µF output capacitor. The MAX8640Y switches at up to 2 MHz for higher efficiency while still allowing small 2.2 µH and 4.7 µF components. Output current is guaranteed up to 500 mA, while typical quiescent current is 28 µA. Factory-preset output voltages from 0.8 V to 2.5 V eliminate external feedback components.

The internal synchronous rectification greatly improves efficiency and replaces the external Schottky diode required in conventional step-down converters. The internal fast soft-start eliminates inrush current which reduces input capacitor requirements.

Features
  • 500 mA guaranteed output current
  • 4 MHz or 2 MHz PWM switching frequency
  • Tiny external components: 1 µH/2.2 µF or 2.2 µH/4.7 µF
  • 28 µA quiescent current
  • Factory preset outputs from 0.8 V to 2.5 V
  • ±1% initial accuracy
  • Low output ripple at all loads
Published: 2017-02-15

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