The MAX16834 is a current-mode high-brightness LED
(HB LED) driver for boost, buck-boost, 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
buck-boost 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 DC-DC
converter applications such as boost or buck-boost.
Additional features include external
enable/disable input, an on-chip oscillator, fault indicator
output (active-low FLT) for LED open/short or overtemperature
conditions, and an overvoltage protection sense input
(OVP+) for true overvoltage protection.
The MAX16834 is available in a thermally enhanced
4mm x 4mm, 20-pin TQFN-EP package and in a thermally
enhanced 20-pin TSSOP-EP package and is specified
over the automotive -40°C to +125°C temperature range.
Key Features
Applications/Uses
Wide Input Operating Voltage Range (4.75V to
28V)
Works for Input Voltage >28V with External
Voltage Clamp on VIN for Boost Converter
3000:1 PWM Dimming/Analog Dimming
Integrated PWM Dimming MOSFET Driver
Integrated High-Side Current-Sense Amplifier for
LED Current Sense in Buck-Boost Converter
100kHz to 1MHz Programmable High-Frequency
Operation
External Clock Synchronization Input
Programmable UVLO
Internal 7V Low-Dropout Regulator
Fault Output (active-low FLT) for Overvoltage, Overcurrent,
and Thermal Warning Faults
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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