Integrated 8-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
High-Efficiency, 8-Channel, Constant-Current, Linear LED Drivers with a Switch-Mode Controller and ±3% Current Matching Among Strings that Enables Paralleling of Output Currents Higher than 55mA per LED String
The MAX16807/MAX16808 are integrated, high-efficiency
white or RGB LED drivers. They are designed for
LCD backlighting and other LED lighting applications
with multiple strings of LEDs. The MAX16807/MAX16808's current-mode PWM controller regulates the necessary voltage to the LED array. Depending on
the input voltage and LED voltage range, it can be
used with boost or buck-boost (SEPIC) topologies. The
MAX16807/MAX16808 feature an 8V to 26.5V input voltage
range. A wide range of adjustable frequency
(20kHz to 1MHz) allows design optimization for efficiency
and minimum board space.
The MAX16807/MAX16808 LED drivers include eight
open-drain, constant-current-sinking LED driver outputs
rated for 36V continuous operation. The LED current-control
circuitry achieves ±3% current matching among
strings and enables paralleling of outputs for LED string
currents higher than 55mA. The output-enable pin is
used for simultaneous PWM dimming of all output channels.
Dimming frequency range is 50Hz to 30kHz and
dimming ratio is up to 5000:1. The constant-current outputs
are single resistor programmable and the LED current
can be adjusted up to 55mA per output channel.
The MAX16807/MAX16808 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-standard,
4-wire serial interface. The MAX16808 includes
circuitry that automatically detects open-circuit LEDs.
The MAX16807/MAX16808 include overtemperature
protection, operate over the full -40°C to +125°C temperature
range, and are available in a thermally
enhanced, 28-pin TSSOP exposed paddle package.
MAX16807/MAX16808
EEPW Analog/Mixed-Signal IC Market Application
Award Winner 2006
Key Features
Applications/Uses
Eight Constant-Current Output Channels (Up to 55mA Each)
±3% Current Matching Among Outputs
Paralleling Channels Allows Higher Current per LED String
Outputs Rated for 36V Continuous Voltage
Output-Enable Pin for PWM Dimming (Up to 30kHz)
One Resistor Sets LED Current for All Channels
Wide Dimming Ratio Up to 5000:1
Low Current-Sense Reference (300mV) for High Efficiency
8V to 26.5V Input Voltage or Higher with External Biasing Devices
Open LED Detection (MAX16808)
4-Wire Serial Interface to Control Individual Output Channels
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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