MAX1649ESA

DC DC Switching Controllers Overview

The MAX1649ESA+ is a BiCMOS step-down DC-DC switching controller designed for high-efficiency power regulation. It features a unique current-limited pulse-frequency-modulated (PFM) control scheme, delivering over 90% efficiency across loads from 10mA to 1.5A while consuming only 100µA of quiescent supply current. The device supports an input voltage range of 5.5V to 16.5V and provides a fixed 5V output or adjustable configuration. It achieves dropout performance down to 300mV at 500mA with up to 96.5% duty cycle and switching frequencies up to 300kHz.

DC DC Switching Controllers Feature Summary

• Implements current-limited PFM control for high efficiency at light and heavy loads
• Provides low dropout voltage performance via high switch duty cycle
• Features ultra-low quiescent and shutdown supply currents for battery operation

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 specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure the component matches the required electrical specifications for your design. Cross-reference the datasheet revision to confirm pinout compatibility. Confirm RoHS compliance status if required by your manufacturing standards.

DC DC Switching Controllers Selection Notes

Select this controller when designing compact, battery-operated systems requiring high efficiency across wide load ranges. It is suitable for applications where minimizing standby current is critical. Consider the external component requirements for inductor and capacitor selection based on the desired switching frequency and output current.

DC DC Switching Controllers Part Context

The MAX1649 belongs to Maxim Integrated's family of high-efficiency step-down DC-DC controllers. It is often compared with the MAX1651, which offers a fixed 3.3V output. These devices are engineered to replace traditional PWM converters in portable electronics, offering superior performance in space-constrained designs.

DC DC Switching Controllers Replacement Considerations

MAX1651ESA+ is a direct functional substitute within the same series, differing primarily in its fixed 3.3V output voltage instead of the MAX1649's 5V output. Both share identical control schemes and packaging.