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Atmel LED Driver Technology
Atmel® LED drivers are based on system-centric, mixed-signal LED driver technology for backlighting and solid-state lighting (SSL) applications. This broad-based and rapidly growing market includes LCD TVs, PC monitors, specialty panels (industrial, military, medical, avionics, etc.) and general illumination for the commercial, residential, industrial and government market segments. LED drivers utilize a proprietary and patented combination of analog and digital circuit techniques and power control schemes.
These products comprise a system-centric solution for local and global dimming, power management, signal conditioning and smart interfacing. This approach allows electronic equipment manufacturers to significantly enhance product features, while improving power efficiency, reliability and cost/performance.
LED Drivers Devices
| Device Family |
Summary Benefit |
Applications |
Technologies |
Key Parameters |
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Linear and Switching Driver Solution High LED Current Accuracy Wide Dimming Range Synchronizes to TV Video Signals Factory-Calibrated Settings Stored in EEPROM |
Solid State Lighting High CRI Designs |
External AC-DC and DC-DC Control and External Current Sinks Adaptive Power Control Scheme Correlated Color Temperature (CCT) Compensation Circuitry |
External Power Supply Efficiency Optimizer Control External PWM Inputs/Serial Interface EEPROM |
Atmel® LED drivers deliver intelligent system controls for multiple LED parallel arrays such as street lighting, tunnel lights, parking garage lights, fluorescent tube replacements, and solar/off-grid lighting. Patented Atmel Adaptive Power Scaling technology results in significant power savings by automatically adjusting the LED supply to the lowest voltage to maintain regulation across all LED strings. The LED drivers incorporate functionality for dynamic white point-setting, color-mixing and brightness control, as well as correlated color temperature (CCT) compensation. Comprehensive monitoring adjusts for aging, faults, and thermal effects.
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Allows for higher power operation up to 2A per channel
Supports up to 250V string voltage
Widest Dimming Range for zone / regional dimming
Controls LED Supply to reduce any headroom
Synchronizes to TV video Signals
Allows user to program startup settings |
Television Direct Backlight Monitor Backlight |
External DC-DC Control and Internal Current Sinks |
External DC-DC Supply
12-bit PWM Dimming
Efficiency Optimizer
Video Sync
EEPROM |
The Atmel® family of LED drivers offers the highest integration, reducing the overall system cost and size for flat-panel televisions. These devices support both edge-lit and direct backlight LCD configurations. Patented Atmel Adaptive Power Scaling technology also delivers significant power savings. All drivers incorporate an internal pulse-width modulation (PWM) engine with video sync capability that eliminates motion blur and offers the industry’s widest dimming range (up to 12 bits), precision string control and string-to-string-matching. Comprehensive monitoring adjusts for LED aging, faults and thermal effects.
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Allows for higher power operation up to 100mA per channel
Widest Dimming Range for zone / regional dimming
Controls LED Supply to reduce any headroom
Synchronizes to TV video Signals
Allows user to program startup settings |
Television Edge-lit Backlight Solid State Lighting |
External DC-DC Control and External Current Sinks |
External DC-DC Supply and FETS
12-bit PWM Dimming
Efficiency Optimizer
External PWM Inputs |
The Atmel® family of LED drivers offers the highest integration, reducing the overall system cost and size for flat-panel televisions. Their patented Efficiency Optimizer delivers significant power savings using simple and inexpensive power connector topologies. All drivers incorporate an internal pulse-width modulation ( PWM) engine with video sync capability that eliminates motion blur and offers the industry’s widest dimming range (up to 12 bits), precision string control and tight string-to-string-matching. Comprehensive system monitoring adjusts for LED aging, faults and thermal effects.
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Strings can be used in parallel for higher current needs
No compensation required, adapts to LED supply requirements
Allows up to 12 LEDs per String
LED driver can operate from typical 5V, 12V and 24V supplies or battery management. |
Notebook Backlight Industrial Displays |
Integrated Boost Controller and Internal Current Sinks |
Up to 8 Strings (30mA per String)
Integrated Boost Controller
Up to 50V per String
Wide Vin Supply |
Atmel offers LED driver solutions with feature sets that are specifically designed to reduce component count, provide design flexibility, and enable the lowest overall system cost for industrial and medical LED backlit LCD displays. These devices have a digitally controlled feedback loop to manage the LED supply and regulate LED current up to 30mA per LED string, up to 12 LEDs per string. LED dimming is achieved through an external PWM signal or an internal 8-bit PWM engine. Analog dimming of LED string current is available for use with an ambient light sensor (ALS) and/or temperature management with a thermistor sensorand don’t need external compensation.
Learn more
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Strings can be used in parallel for higher current needs
No compensation required, adapts to LED supply requirements
Allows up to 12 LEDs per String
LED driver can operate from typical 5V, 12V and 24V supplies or battery management. |
Notebook Backlight Industrial Displays |
Integrated Boost Controller and Internal Current Sinks |
Up to 8 Strings (30mA per String)
Integrated Boost Controller
Up to 50V per String
Wide Vin Supply |
Atmel offers LED driver solutions with feature sets that are specifically designed to reduce component count, provide design flexibility and enable lowest overall system solution cost for notebooks with LED backlit LCD displays. These devices offer a digital control loop and require no external components to manage the LED supply and regulate LED current up to 30mA per LED string, up to 12 LEDs per string. LED dimming is achieved through an external PWM signal or an internal 8-bit PWM engine. Analog dimming of LED string current is available for use with an ambient light sensor (ALS) and/or temperature management with a thermistor or IC temperature sensor
Learn more
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Allows for higher power operation up to 2A per channel
Supports up to 250V string voltage
Widest Dimming Range for zone / regional dimming
Controls LED Supply to reduce any headroom
Synchronizes to TV video Signals
Allows user to program startup settings |
Television Direct Backlight Monitor Backlight |
External DC-DC Control and Internal Current Sinks |
External DC-DC Supply
12-bit PWM Dimming
Efficiency Optimizer
Video Sync
EEPROM |
The Atmel® family of LED drivers offers the highest integration, reducing the overall system cost and size for LED backlit monitors. Our compact, high-power 16-parallel string LED drivers feature internal current control MOSFETs that sink up to 30mA per LED string with better than 3% accuracy. They can drive up to 10 white LEDs per string, for up to 160 LEDs per device. A single pulse-width modulation (PWM) input controls the PWM period and duty cycle for all strings. These devices also offer automatic fault management of string open-circuit, short-circuit and over-temperature conditions. Faults are alerted on the FLTB pin, and fault status is optionally available through the I2C/SMBus compatible serial interface.
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Multi-string Solution
Atmel offers compact, high-power LED drivers for multi-LED string applications such as direct backlight/edge-lit LCD panels and high-brightness solid-state lighting applications.
Atmel LED driver solutions comprise of three product families:
The Integrated Boost Controller and Internal Current Sinks LED driver family provides an internal boost controller and an internal current control MOSFET to sink up to 30mA per string. These devices can drive up to six strings with up to 12 white LEDs per string, for a total of 72 LEDs per device—scalable up to four devices. These solutions address the notebook, industrial and medical LCD panel markets, where design simplicity, small BOM and internal digital compensation are critical.
The external DC-DC Control and Internal Current Sinks LED driver family delivers power, controllability and programmability—all in one compact solution. These devices adaptively control the external DC-DC/AC-DC converters that power the LED strings using Atmel Efficiency Optimizer technology, which minimizes power use while maintaining LED current accuracy. These high-power LED string drivers use internal current control MOSFETs to sink up to 100mA per string, and can drive 16 parallel strings of 10 white LEDs each, for a total of 160 white LEDs per device. Each string can be individually controlled to enable area (zone) dimming for highest dynamic range and significantly reduced power usage. These devices address the direct backlight LCD panels and monitor applications.
The LED Drivers Solutions with External DC-DC and NFETs drivers family also offers the Efficiency Optimizer technology, but uses external current control MOSFETs to sink up to 2A per string. The devices can drive 4-16 parallel strings of LEDs and offer fault detection and management of open circuit and short circuit LEDs. They also support LED string voltages up to 250V. These devices address the edge-lit and high-brightness solid state-lighting applications, which require higher power while enabling PWM and analog dimming.
