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MAX16814ATV Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX16814ATV Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 25 page _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller General Description The MAX16814 high-efficiency, high-brightness LED (HB LED) driver provides up to four integrated LED current- sink channels. An integrated current-mode switching DC-DC controller drives a DC-DC converter that pro- vides the necessary voltage to multiple strings of HB LEDs. The MAX16814 accepts a wide 4.75V to 40V input voltage range and withstands direct automotive load- dump events. The wide input range allows powering HB LEDs for small to medium-sized LCD displays in automo- tive and general lighting applications. An internal current-mode switching DC-DC controller supports the boost, coupled-inductor boost-buck, or SEPIC topologies and operates in an adjustable fre- quency range between 200kHz and 2MHz. It can also be used for single-inductor boost-buck topology in conjunc- tion with the MAX15054 and an additional MOSFET. The current-mode control with programmable slope com- pensation provides fast response and simplifies loop compensation. The MAX16814 also features an adaptive output-voltage control scheme that minimizes the power dissipation in the LED current-sink paths. The MAX16814 consists of four identical linear current source channels to drive four strings of HB LEDs. The channel current is adjustable from 20mA to 150mA with an accuracy of ±3% using an external resistor. The external resistor sets all 4-channel currents to the same value. The device allows connecting multiple channels in parallel to achieve higher current per LED string. The MAX16814 also features pulsed dimming control, on all four channels through a logic input (DIM). In addition,the MAX16814A_ _ and MAX16814U_ _ include a unique feature that allows a very short minimum pulse width as low as 1µs. The MAX16814 includes an output overvoltage, open- LED detection and protection, programmable shorted LED detection and protection, and overtemperature pro- tection. The device operates over the -40NC to +125NC automotive temperature range. The MAX16814 is avail- able in 6.5mm x 4.4mm, 20-pin TSSOP and 4mm x 4mm, 20-pin TQFN packages. Applications Automotive Displays LED Backlights Automotive RCL, DRL, Front Position, and Fog Lights LCD TV and Desktop Display LED Backlights Architectural, Industrial, and Ambient Lighting Features S 4-Channel Linear LED Current Sinks with Internal MOSFETs Full-Scale LED Current Adjustable from 20mA to 150mA Drives One to Four LED Strings S Boost, SEPIC, or Coupled-Inductor Boost-Buck Current-Mode DC-DC Controller 200kHz to 2MHz Programmable Switching Frequency External Switching Frequency Synchronization S Adaptive Output-Voltage Optimization to Minimize Power Dissipation S 4.75V to 40V Operating Input Voltage Range S Less than 40µA Shutdown Current S 5000:1 PWM Dimming at 200Hz (MAX16814A _ _ and MAX16814U_ _ Only) S Open-Drain Fault Indicator Output S Open-LED and LED Short Detection and Protection S Overtemperature Protection S Thermally Enhanced, 20-Pin TQFN and TSSOP Packages Typical Operating Circuit and Pin Configurations appear at end of data sheet. 19-4722; Rev 5; 3/11 +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V Denotes an automotive qualified part. Ordering Information EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE MAX16814ATP+ -40 °C to +125°C 20 TQFN-EP* MAX16814ATP/V+ -40 °C to +125°C 20 TQFN-EP* MAX16814AUP+ -40 °C to +125°C 20 TSSOP-EP* MAX16814AUP/V+ -40 °C to +125°C 20 TSSOP-EP* MAX16814BETP+ -40 °C to +85°C 20 TQFN-EP* MAX16814BEUP+ -40 °C to +85°C 20 TSSOP-EP* MAX16814BUTP+ 0 °C to +85°C 20 TQFN-EP* MAX16814BUUP+ 0 °C to +85°C 20 TSSOP-EP* MAX16814UTP+ 0 °C to +85°C 20 TQFN-EP* MAX16814UUP+ 0 °C to +85°C 20 TSSOP-EP* |
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