LT1618EDD#PBF

Overview

The LT1618EDD#PBF is a Constant-Current/Constant-Voltage Step-Up DC/DC Converter manufactured by Analog Devices Inc. It operates with an input voltage range of 1.6 V to 18 V and provides an adjustable output voltage from 1.263 V to 36 V. The device utilizes a fixed frequency, current-mode switching architecture at a 1.4 MHz switching frequency. It features precise input/output current control with overtemperature accuracy of ±5% and precise output voltage control with ±1% accuracy. The component is housed in a 10-pin DFN EP package measuring 3 mm x 3 mm.

Feature Summary

• Integrates traditional voltage feedback loop with unique current feedback loop for combined constant-current and constant-voltage operation
• Supports wide input voltage range from 1.6 V to 18 V for flexible power source compatibility
• High 1.4 MHz switching frequency enables the use of compact, thin inductors and capacitors
• Includes IADJ pin for programmable current regulation with 50 mV current sense voltage

Applications

• LED backlight drivers
• USB-powered boost or SEPIC converters
• Input current-limited boost or SEPIC converters
• Battery chargers

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the package type matches the 10-pin DFN EP footprint required for your PCB layout. Ensure the operating temperature range aligns with your system requirements, as industrial grades may differ. Cross-reference the manufacturer part number with official Analog Devices documentation to avoid counterfeit components.

Selection Notes

Select this component when designing circuits requiring simultaneous constant-current and constant-voltage regulation capabilities. The high switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 1.6 V minimum input voltage constraint when choosing input sources. Evaluate the thermal performance within the DFN EP package for your specific power dissipation needs.

Part Context

This part belongs to the LT1618 family of step-up DC/DC converters designed for applications needing precise current and voltage control. It is distinct from standard voltage-only regulators due to its dual-loop feedback architecture. The EDD#PBF designation specifies the DFN package variant with lead-free termination, differentiating it from MSOP or tape-and-reel options.

Replacement Considerations

LT1618EDDPBF is a verified equivalent part number representing the same functional specifications and package configuration.