IC-Controlled 4-Channel Low-Voltage 120mA LED Backlight Driver with Integrated Boost Converter

The MAX25512B is a 4-channel white LED backlight driver with an integrated current-mode boost converter that operates over a switching frequency range of 400kHz to 2.2MHz and incorporates spread spectrum. Phase-shifting of the output channels is included as an option to further reduce electromagnetic interference (EMI).

The device provides up to 120mA per channel and includes a control output for an external nMOS series switch. It is capable of operating down to 3V after startup. The device is hybrid-dimming-capable and provides a brightness calibration feature through a dedicated DAC. It can benefit from these two functions simultaneously.

The MAX25512B has an I2C interface to enable flexibility of control and detailed diagnostics. The MAX25512B is available in a compact TQFN package and operates over the -40°C to +125°C temperature range.

APPLICATIONS

* Automotive Instrument Clusters

* Automotive Central Information Displays

* Automotive Head-Up Displays

* Operates down to 3V on Battery Input after Startup

* Wide Boost Duty Cycle to Support Low Input Voltage

* Boost or SEPIC Current-Mode DC-DC Controller

* 400kHz to 2.2MHz Operating Frequency Range

* Spread Spectrum Available

* Ability to Synchronize to an External Clock

* LED Current Sinks

* Up to 120mA Output Current per String with Fine-Adjust DAC for brightness calibration

* Low OUT Regulation Voltage for Best Efficiency

* Optional Phase-Shifting of Outputs

* I2C Control for Enhanced Flexibility