Data Sheet
MAX25501
4 x 24 Automotive LED Matrix Driver with ASIL B Features
General Description
Benefits and Features
● Flexible Configuration Using SPI Interface with CRC
• Programmable Multiplex Ratio Between 4:1 and 1:1
• Integrated Column Drivers
The MAX25501 is a 4 x 24-channel modular matrix backlight
driver for use with local-dimming automotive displays. The
integrated current outputs can sink up to 72mA LED current
each. The source drive pins provide current to the columns of
the matrix on a multiplexed basis. Device power comes from
an external 3.3V or 5V supply, while the LED current-sink out-
puts can operate at up to 14V.
• Programmable Dither for Enhanced Resolution
• Optional Individual Programmable Delays
• Optional Pseudorandom Fine Delay on Each Output
● 24 Row Drivers
• Up to 72mA Peak Output Current
• Individual Current Control for Each LED Zone
• Very Narrow Minimum Current Pulse for Maximum
Dimming Ratio
A feedback output pin (FB) is provided to control an external
DC-DC converter so that voltage headroom can be optimized
and the overall system power dissipation reduced.
The device is highly flexible due to its programmability using
the SPI interface. Among the programmable parameters are
the LED current, individual PWM settings, and multiplex ratio.
• Ghosting Elimination Features
● Extensive Diagnostics Supporting ASIL B
• Shorted or Open LEDs
The MAX25501 includes multiple diagnostic features to aid in
the building of ASIL B systems.
• Programmable V
Undervoltage/Overvoltage
LED
Detection with Flag
• Adjacent SNK_ to SNK_ Short Detection
• Shorted SNK_ or SRC_ to GND
The device features a high-speed SPI interface for control
using a daisy-chain or star configuration. Up to 16 devices can
be daisy-chained to reduce connection complexity.
• I
Out of Range
SET
• Internal Clock Out-of-Range Detection
• Bandgap Reference Out-of-Range
• CRC on SPI Transactions
The MAX25501 is available in TQFN and TSSOP packages
and operates in the -40°C to +125°C temperature range.
• CRC on Internal Memory Contents
• Undervoltage/Overvoltage Detection on All Supplies
• Thermal Warning/Shutdown
Applications
● Central Information Displays
● Instrument Clusters
● Interior Lighting
● FB Output to Control External DC-DC Converter
● High-Speed Daisy-Chain/Star SPI Interface
● V
Synchronization Input (Programmable Active
SYNC
High/Low)
● 48-Lead TQFN and TSSOP Packages
● AEC-Q100 Grade 1 Qualified
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Rev. 1
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices
DOCUMENT FEEDBACK
for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change
without notice. No license is granted by implicationor otherwise under any patent or patent rights of Analog Devices. Trademarks andregistered
trademarks are the property of their respective owners.
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