MAX1649CSA

DC DC Switching Controllers Overview

The MAX1649CSA is a high-efficiency, low-dropout step-down DC-DC controller manufactured by Analog Devices Inc./Maxim Integrated. It utilizes a current-limited pulse-frequency-modulated (PFM) control scheme to maintain efficiency across loads from 1mA to over 2.5A while consuming only 100µA of supply current. The device supports input voltages up to 16V and provides fixed 5V or 3.3V outputs, or adjustable regulation. Key electrical parameters include a maximum quiescent current of 100µA, shutdown current of 5µA, dropout voltage below 0.3V at 500mA, and switching frequencies up to 300kHz with a duty cycle reaching 96.5%.

DC DC Switching Controllers Feature Summary

• Implements current-limited pulse-frequency modulation for high efficiency at light and heavy loads
• Achieves ultra-low quiescent supply current of 100µA during operation
• Provides deep shutdown capability with maximum supply current of 5µA
• Supports high switch duty cycles up to 96.5% for minimal dropout performance

DC DC Switching Controllers Applications

• Battery-powered portable applications requiring extended runtime
• High-efficiency step-down regulation in PDAs and mobile devices
• 5V-to-3.3V conversion in green PC systems
• General-purpose DC-DC conversion where low standby power is critical

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'CSA' against the official datasheet to confirm package type and temperature range compatibility. Ensure that the required output voltage configuration matches the fixed or adjustable variants documented for this part number. Cross-reference the manufacturer's latest documentation to confirm availability status and any potential obsolescence notices prior to finalizing procurement plans.

DC DC Switching Controllers Selection Notes

Select the MAX1649CSA when design requirements demand high efficiency across a wide load range combined with minimal standby power consumption. This controller is suitable for applications where input voltages exceed the desired output significantly, leveraging its low dropout characteristics. Consider the external component requirements for inductor selection and feedback network configuration as specified in the application circuit guidelines.

DC DC Switching Controllers Part Context

The MAX1649 belongs to a family of BiCMOS step-down DC-DC controllers designed for high-efficiency power management. It distinguishes itself from traditional PWM converters by offering superior light-load efficiency through PFM control. The device is part of Maxim Integrated's portfolio aimed at battery-operated electronics, providing robust regulation and protection features within a compact surface-mount package.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.