MAX1649CSA+T

DC DC Switching Controllers Overview

The MAX1649CSA+T is a BiCMOS step-down DC-DC switching controller from Analog Devices Inc./Maxim Integrated, housed in an 8-pin SOIC package. It provides high efficiency over load currents ranging from 1mA to more than 2.5A using a unique current-limited pulse-frequency-modulated (PFM) control scheme. The device features a maximum input voltage of 16V and delivers a fixed 5V output. Quiescent supply current is limited to 100µA, with shutdown current at 5µA. Dropout performance reaches 300mV at 500mA due to a 96.5% duty cycle and low current-sense threshold.

DC DC Switching Controllers Feature Summary

• Utilizes a current-limited pulse-frequency-modulated control scheme for high efficiency across wide load ranges
• Provides low dropout performance down to 300mV at 500mA loads
• Features ultra-low quiescent supply current of 100µA and shutdown current of 5µA

DC DC Switching Controllers Applications

• Battery-powered applications requiring high efficiency
• Green PC applications for power management
• High-efficiency step-down regulation systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix CSA+T against official manufacturer documentation to confirm pinout compatibility and RoHS compliance status. Confirm that the fixed 5V output variant matches system requirements, as adjustable versions exist within the same family. Ensure sourcing channels provide genuine components with traceable manufacturing data to avoid counterfeit risks associated with legacy PMICs.

DC DC Switching Controllers Selection Notes

Select this component when designing systems requiring efficient step-down conversion from inputs up to 16V to a regulated 5V rail. The PFM architecture suits applications needing minimal standby power consumption. Consider thermal dissipation capabilities given the 2.5A output capability in an SOIC package. Verify external component selection for stability at the target switching frequency.

DC DC Switching Controllers Part Context

This part belongs to the MAX1649/MAX1651 series of high-efficiency, low-dropout, step-down DC-DC controllers. These devices are designed to replace traditional PWM converters by offering similar heavy-load efficiency while significantly reducing light-load supply current. The series supports various output voltages, including fixed 5V and 3.3V options, or adjustable configurations.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers: MAX1649CSA+, MAX1651CSA+. Note that MAX1651CSA+ provides a fixed 3.3V output instead of 5V.