MAX16834

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.

Features of the MAX16834 are:(1)wide input operating voltage range (4.75V to 28V); (2)works for input voltage > 28V with external voltage clamp on VIN for Boost Converter; (3)3000:1 PWM dimming/analog dimming; (4)integrated PWM dimming MOSFET driver; (5)integrated high-side current-sense amplifier for LED current sense in boost-buck converter; (6)100kHz to 1MHz programmable high-frequency operation; (7)external clock synchronization input; (8)programmable UVLO; (9)internal 7V low-dropout regulator; (10)fault output (FLT) for overvoltage, overcurrent,and thermal warning faults; (11)programmable true differential overvoltage protection; (12)20-pin TQFN-EP and TSSOP-EP packages.

The absolute maximum ratings of the MAX16834 can be summarized as:(1)IN, HV, LV to GND:-0.3V to +30V;(2)storage temperature range:-65 to +150;(3)operating temperature range:-40 to +125;(4)junction temperature:+150;(5)continuous power dissipation:2051mW.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The MAX16834 synchronizes to an external clock signal at RT/SYNC. The application of an external clock disables the internal oscillator allowing the MAX16834 to use the external clock for switching operation. The internal oscillator is enabled if the external clock is absent for more than 50s. The synchronizing pulse minimum width for proper synchronization is 200ns.