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MAX16834

Maxim Integrated Products
Part Number MAX16834
Manufacturer Maxim Integrated Products
Description High-Power LED Driver
Published Feb 7, 2010
Detailed Description EVALUATION KIT AVAILABLE MAX16834 High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MO...
Datasheet PDF File MAX16834 PDF File

MAX16834
MAX16834

Overview
EVALUATION KIT AVAILABLE MAX16834 High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver General Description The MAX16834 is a current-mode high-brightness LED (HB LED) driver for boost, boost-buck, SEPIC, and highside buck topologies.
In addition to driving an n-channel power MOSFET switch controlled by the switching controller, it also drives an n-channel PWM dimming switch to achieve LED PWM dimming.
The MAX16834 integrates all the building blocks necessary to implement a fixed-frequency HB LED driver with wide-range dimming control.
The MAX16834 features constant-frequency peak current-mode control with programmable slope compensation to control the duty cycle of the PWM controller.
A dimming driver designed to drive an external n-channel MOSFET in series with the LED string provides wide-range dimming control up to 20kHz.
In addition to PWM dimming, the MAX16834 provides analog dimming using a DC input at REFI.
The programmable switching frequency (100kHz to 1MHz) allows design optimization for efficiency and board space reduction.
A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz while an external clock signal at RT/SYNC disables the internal oscillator and allows the MAX16834 to synchronize to an external clock.
The MAX16834’s integrated highside current-sense amplifier eliminates the need for a separate high-side LED current-sense amplifier in boost-buck applications.
The MAX16834 operates over a wide supply range of 4.
75V to 28V and includes a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications.
It can also operate at input voltages greater than 28V in boost configuration with an external voltage clamp.
The MAX16834 is also suitable for DCDC converter applications such as boost or boostbuck.
Additional features include external enable/ disable input, an on-chip oscillator, fault indicator output (FLT) for LED open/short or overtemperat...


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