LM3430SD

Overview

The LM3430SD is a constant current buck controller IC designed for driving high-brightness LEDs. It operates with an input voltage range of 6V to 40V and supports a switching frequency of 2MHz. The device features SEPIC and boost topologies, offering one output channel. It utilizes PWM dimming control and is housed in a 12-WSON (3x3) package with exposed pad. The component functions within a junction temperature range of -40°C to 125°C.

Feature Summary

• Supports SEPIC and boost topologies for flexible LED drive configurations
• Integrates PWM dimming capability for brightness control
• Operates with wide input voltage range up to 40V
• Housed in compact 12-WSON surface-mount package

Applications

• LED backlighting systems
• High-brightness LED driver circuits
• General LED lighting applications

Procurement Notes

Verify the specific ordering suffix and lifecycle status before procurement, as the LM3430SD may be obsolete or discontinued depending on the distributor. Confirm RoHS compliance requirements, as some variants are non-compliant. Ensure the correct package type matches the PCB footprint design. Check for available reference designs such as the LM3430EVAL for validation purposes prior to finalizing supply chain decisions.

Selection Notes

Select this component when designing LED drivers requiring SEPIC or boost topology with a wide input voltage range. Consider the 2MHz switching frequency for smaller passive component sizes. Verify that the 12-WSON package fits the thermal and spatial constraints of the application. Ensure the design accounts for the lack of internal switches and the need for external MOSFET integration.

Part Context

The LM3430SD belongs to the LM3430 family of LED driver controllers from Texas Instruments. It is specifically engineered for high-voltage start-up and input under-voltage detection in LED applications. The part serves as a DC-DC controller rather than a complete converter, requiring external power switches. It is distinct from synchronous buck regulators like the LM3370 series.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source data.