LM3620M5-4

Battery Chargers Overview

The LM3620M5-4 is a high-efficiency step-up DC/DC converter manufactured by National Semiconductor, designed for portable applications. It integrates a power switch and operates from a single lithium-ion cell or two alkaline cells. The device features an adjustable output voltage range of 2.8V to 5.5V, with a fixed 4.1V option in this specific suffix variant. It supports up to 1A load current and includes programmable switching frequency selection via an external resistor. Key internal protections include thermal shutdown and current limit.

Battery Chargers Feature Summary

• Integrates a high-efficiency synchronous boost converter topology
• Supports input voltage ranges compatible with single-cell Li-ion or dual-alkaline batteries
• Includes comprehensive protection mechanisms such as thermal shutdown and cycle-by-cycle current limiting

Battery Chargers Applications

• Portable media players
• Mobile phones
• Personal digital assistants (PDAs)
• MP3 players

Battery Chargers Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets were acquired by Texas Instruments. Confirm the package type matches the M5-4 designation (SOT-23-5). Ensure the datasheet version aligns with the specific revision history for electrical characteristics. Cross-reference pinouts with official documentation to avoid compatibility issues with legacy designs.

Battery Chargers Selection Notes

Select this component when designing battery-powered systems requiring a stable boosted voltage from a single-cell source. Consider the efficiency curve at expected load currents and the impact of the selected switching frequency on passive component size. Evaluate the need for external compensation components based on the desired transient response and stability requirements under varying load conditions.

Battery Chargers Part Context

This part belongs to the LM362x family of boost converters, which are optimized for low-input voltage applications. The family shares common architectural features but varies in output voltage settings, package options, and specific feature sets like enable pins or frequency adjustment methods. The LM3620 series is distinct from linear regulators due to its switching nature, offering higher efficiency at higher output voltages relative to the input.

Battery Chargers Replacement Considerations

• LM3620M5-4.1
• LM3620M5-4.2

Battery Chargers FAQ

What determines the output voltage of the LM3620M5-4?

The output voltage is set by an external resistor divider network connected to the feedback pin, allowing for adjustable outputs within the specified range.

Does the LM3620M5-4 support continuous conduction mode?

Yes, the device can operate in continuous conduction mode (CCM) depending on the load current and inductor selection, though it may enter discontinuous mode at light loads.