MAX1649CPA+

DC DC Switching Controllers Overview

The MAX1649CPA+ is a BiCMOS step-down DC-DC switching controller manufactured by Analog Devices Inc./Maxim Integrated. It utilizes a unique current-limited pulse-frequency-modulated (PFM) control scheme to achieve high efficiency across load currents ranging from 1mA to over 2.5A. The device features a maximum input voltage of 16V and offers fixed 5V output or adjustable configurations. Key electrical parameters include a maximum quiescent supply current of 100µA, a shutdown supply current of 5µA, and a switching frequency up to 300kHz. It supports a duty cycle of up to 96.5% and provides dropout performance down to 300mV at 500mA loads.

DC DC Switching Controllers Feature Summary

• Implements a current-limited PFM control scheme for high efficiency at light and heavy loads
• Provides low dropout performance with a high switch duty cycle capability
• Features ultra-low quiescent and shutdown supply currents for battery conservation

DC DC Switching Controllers Applications

• Battery-powered portable applications
• High-efficiency step-down regulation in PDAs
• 5V-to-3.3V conversion in green PC systems

DC DC Switching Controllers Procurement Notes

Verify the package type matches the required design constraints, as the CPA suffix indicates a specific physical form factor. Confirm that the operating temperature range aligns with the target environment specifications. Ensure the external component selection supports the 300kHz switching frequency and current requirements. Check for RoHS compliance status if environmental regulations apply to the final assembly.

DC DC Switching Controllers Selection Notes

Select this controller when system efficiency is critical across a wide dynamic load range. It is suitable for designs requiring minimal standby power consumption due to its low shutdown current. Consider the external inductor and capacitor values carefully to maintain stability at the specified switching frequency. Evaluate the thermal performance based on the expected output power and ambient conditions.

DC DC Switching Controllers Part Context

This component belongs to the MAX1649 family of step-down DC-DC controllers. It is functionally related to the MAX1651, which provides a fixed 3.3V output. The MAX1649/MAX1651 are improved versions of the older MAX649/MAX651 series, offering better efficiency and lower quiescent current. This family is designed for applications where space and power savings are primary concerns.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers: MAX1651CPA+