6 x 220mA, ASIL B LED Backlight Driver with Boost Controller

The MAX25561 is a 6-channel LED backlight driver with an integrated current-mode boost controller that operates over a switching frequency range of 400kHz to 2.2MHz and incorporates spread spectrum. Selectable phase-shifting of the output channels is included to reduce EMI. The MAX25561 provides up to 220mA per channel. The device is capable of operating down to very low battery voltages by virtue of a unique input voltage switching scheme.

Extensive diagnostics and an I2C interface are included to assist with system ASIL B compliance.

The MAX25561 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 while Maintaining 5V Gate Drive

* Wide Boost Duty-Cycle Range

* Boost or SEPIC Current-Mode DC-DC Controller

* 400kHz to 2.2MHz Operating Frequency Range

* Optional Spread Spectrum

* Can Be Synchronized to an External Clock

* LED Current Sinks

* Up to 220mA Output Current per String

* Low OUT Regulation Voltage

* Optional Phase-Shifting Between Channels

* 16667:1 Dimming Ratio at 200Hz

* External or Internal (I2C) Dimming

* >16667:1 Dimming Ratio with Hybrid Dimming

* Integrated Charge-Pump to Drive Series nMOSFET

* Temperature Foldback Using External NTCTemperature Sensor

* Fast-Startup Option without I2C Intervention UsingEN Pin Only