MIC2291-34YML-TR

LED Driver IC Overview

The MIC2291-34YML-TR is a 1.2MHz pulse-width modulation (PWM) boost-switching regulator optimized for high-current white LED photo flash applications. It features a guaranteed switch current of 1.2A, enabling the drive of three series-connected white LEDs at 100mA. The device operates with an input voltage range of 2.5V to 10V and supports output voltages up to 34V. It incorporates over-voltage protection rated at 34V, a low feedback voltage of 95mV, and a shutdown current of 1µA. The component is housed in an 8-lead MLF package measuring 2mm x 2mm.

LED Driver IC Feature Summary

• Implements constant frequency 1.2MHz PWM control to minimize noise and input ripple injected into the battery source.
• Features a low 95mV feedback voltage to reduce power dissipation in current-setting resistors and minimize total output voltage requirements.
• Includes integrated over-voltage protection rated at 34V to allow the use of smaller external components with appropriate voltage ratings.

LED Driver IC Applications

• High-current white LED photo flash circuits
• Camera flash driver systems
• Portable electronic devices requiring efficient LED illumination

LED Driver IC Procurement Notes

Verify the specific suffix '34' confirms the 34V over-voltage protection rating, as variants exist with different OVP levels. Ensure the 'MLF' package designation matches the required 2mm x 2mm footprint. Confirm RoHS compliance status if environmental regulations apply to the target assembly. Cross-reference the manufacturer part number against official Microchip documentation to validate the lead-free specification and exact thermal characteristics.

LED Driver IC Selection Notes

Select this component when designing for high-brightness LED flashes requiring precise current regulation without microcontroller intervention. The 1.2A switch current capability supports driving multiple series LEDs efficiently. Consider the 1.2MHz switching frequency for reduced passive component size compared to lower-frequency alternatives. Evaluate the 34V OVP limit against the maximum forward voltage of the LED string under fault conditions to ensure system safety.

LED Driver IC Part Context

This part belongs to the MIC2291 family of LED lighting drivers manufactured by Microchip Technology. The family includes variants with different over-voltage protection thresholds, such as 15V and 34V options. These regulators are designed to replace traditional ballast resistors, offering improved efficiency and brightness control for portable lighting applications.

LED Driver IC Replacement Considerations

Direct substitutes within the same family include MIC2291-15YML-TR, which offers 15V over-voltage protection instead of 34V. Other MIC2291 variants may differ in package type or switching frequency. Verify pin compatibility and electrical parameters before substitution.

LED Driver IC FAQ

What is the maximum switch current capability of the MIC2291-34YML-TR?

The device guarantees a switch current of 1.2A, allowing it to drive a string of three white LEDs in series at 100mA.

How does the MIC2291-34YML-TR manage input noise?

It uses a constant frequency 1.2MHz PWM control scheme, which results in much lower noise and input ripple injected back to the battery source compared to variable frequency topologies.