MAX16816
Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming
Programmable High-Power LED Driver Simplifies Design, Allows for Wide-Range Dimming Control, and Minimizes EMI
Part Details
- EEPROM-Programmable LED Current Binning
- Wide Input Range: 5.9V to 76V with Cold Start Operation to 5.4V
- Integrated Floating Differential LED Current-Sense Amplifier
- Floating Dimming Driver Capable of Driving an n-Channel MOSFET
- 5% or Better LED Current Accuracy
- Multiple Topologies: Buck, Boost, Buck-Boost, SEPIC
- Resistor-Programmable Switching Frequency (125kHz to 500kHz) and Synchronization Capability
- 200Hz On-Board Ramp Allows Analog-Controlled PWM Dimming and External PWM Dimming
- Output Overvoltage, Overcurrent, and LED Short Protection
- Enable/Shutdown Input with Shutdown Current Below 45µA
The MAX16816 is a current-mode, high-brightness LED (HB LED) driver designed to control two external n-channel MOSFETs for single-string LED current regulation. The MAX16816 integrates all the building blocks necessary to implement fixed-frequency HB LED drivers with wide-range dimming control and EEPROM-programmable LED current binning with a factor of up to 1.6. This device is configurable to operate as a stepdown (buck), step-up (boost), or step-up/step-down (buck-boost) current regulator.
Current-mode control with adjustable leading-edge blanking simplifies control-loop design. Adjustable slope compensation stabilizes the current loop when operating at duty cycles above 50%. The MAX16816 operates over a wide input voltage range and is capable of withstanding load-dump events. Multiple MAX16816 devices can be synchronized to each other or to an external clock. The MAX16816 includes a floating dimming driver for brightness control with an external n-channel MOSFET in series with the LED string.
HB LEDs using the MAX16816 can achieve efficiencies of over 90%. The MAX16816 also includes a 1.4A source and 2A sink gate driver for driving switching MOSFETs in high-power LED driver applications, such as front light assemblies. Dimming control allows for wide PWM dimming range at frequencies up to 5kHz. Higher dimming ratios (up to 1000:1) are achievable at lower dimming frequencies.
The MAX16816 provides user-programmable features through on-chip nonvolatile EEPROM registers. Adjustable features include a programmable soft-start, LED current (binning), external MOSFET gate driver supply voltage, slope compensation, leading-edge blanking time, and disabling/enabling of the RT oscillator.
The MAX16816 is available in a 32-pin TQFN package with exposed pad and operates over the -40°C to +125°C automotive temperature range.
Applications
- General Illumination
- Navigation and Marine Indicators
- Neon Replacement, Emergency Lighting
- Signage and Beacons
Documentation
This is the most up-to-date revision of the Data Sheet.
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