4-Channel, Low-Voltage, 120mA LED Backlight Drivers with Integrated Boost Converter

The MAX25510/MAX25511 are 4-channel, white-LED backlight drivers with an integrated current-mode boost converter that operate over a switching frequency range of 400kHz to 2.2MHz and incorporate spread spectrum. Phase-shifting of the output channels is included as an option to further reduce EMI.

The devices provide up to 120mA per channel and include a control output for an external nMOS series switch. These devices are capable of operating down to 3V after start-up.

The MAX25510 has a boost current limit of 3A (min), while the MAX25511 implements a higher minimum current limit of 4.5A for increased output power.

The MAX25510/MAX25511 are available in a compact TQFN package and operate over the temperature range -40°C to +125°C.

Applications

* Automotive Central Information Displays * Automotive Head-Up Displays * Automotive Instrument Clusters

* Operate down to 3V on Battery Input after Start-Up

* 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 * Can Be Synchronized to an External Clock

* LED Current Sinks

* Up to 120mA Output Current per String * Low OUT Regulation Voltage for Best Efficiency * Optional Phase-Shifting of Outputs

* 16667:1 Dimming Ratio at 200Hz * NTC Input for LED Current Foldback * Analog Dimming Capable * Built-In Automatic Fading Functionality * FLTB Output Provides Diagnostic Information

* Shorted or Open LEDs * Thermal Shutdown * Output Undervoltage

* Compact, 4mm x 4mm TQFN Package * AEC-Q100 Grade 1