ISL21009CFB841Z-TK

Overview

The ISL21009CFB841Z-TK is a synchronous step-down DC-DC converter from Intersil, designed for efficient power management in portable and industrial applications. It integrates high-side and low-side N-channel MOSFETs to minimize external component count and reduce solution size. The device operates with an input voltage range of 2.7V to 5.5V, providing a regulated output voltage adjustable via an external resistor divider. It features a fixed switching frequency of 1MHz, allowing the use of small inductors and capacitors. The controller supports pulse-skipping mode for improved light-load efficiency and includes comprehensive protection features such as over-current, over-temperature, and soft-start functionality.

Feature Summary

• Integrates high-side and low-side N-channel MOSFETs for compact design
• Supports adjustable output voltage via external resistor network
• Features pulse-skipping mode for enhanced light-load efficiency
• Includes built-in over-current, over-temperature, and soft-start protections

Applications

• Portable consumer electronics requiring efficient power regulation
• Industrial control systems with limited space constraints
• Battery-powered devices needing extended runtime through optimized efficiency

Procurement Notes

Verify the specific suffix 'TK' indicates tape-and-reel packaging when ordering. Confirm the 'CFB841' marking corresponds to the exact pinout and thermal pad configuration required by your PCB layout. Ensure compatibility with the intended input voltage range and load current requirements before finalizing procurement specifications.

Selection Notes

Select this component when a compact, high-efficiency synchronous buck converter is needed for inputs up to 5.5V. Consider its fixed 1MHz frequency for minimizing passive component sizes. Evaluate the integrated MOSFET capabilities against your peak load current needs. Verify that the available output voltage adjustment range meets your system's power rail requirements.

Part Context

This part belongs to Intersil's (now Renesas) ISL2100x series of synchronous step-down converters. These devices are known for their high integration levels and efficiency across various load conditions. The series targets applications where board space is at a premium and power efficiency is critical, such as in mobile devices and embedded systems.

Replacement Considerations

Check for direct pin-to-pin replacements within the ISL2100x family or newer Renesas equivalents. Verify if alternative parts offer similar current ratings and switching frequencies. Ensure any substitute maintains the same package type and thermal characteristics for seamless integration.