MAX16833 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – High-Voltage HB LED Drivers with Integrated High-Side Current Sense

19-5187; Rev 0; 6/10
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High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
General Description
The MAX16833/MAX16833B are peak current-mode-
controlled LED drivers for boost, buck-boost, SEPIC,
flyback, and high-side buck topologies. A dimming driver
designed to drive an external p-channel in series with the
LED string provides wide-range dimming control. This
feature provides extremely fast PWM current switching to
the LEDs with no transient overvoltage or undervoltage
conditions. In addition to PWM dimming, the MAX16833/
MAX16833B provide analog dimming using a DC input at
ICTRL. The MAX16833/MAX16833B sense the LED cur-
rent at the high side of the LED string.
A single resistor from RT/SYNC to ground sets the
switching frequency from 100kHz to 1MHz, while an
external clock signal capacitively coupled to RT/SYNC
allows the MAX16833 or MAX16833B to synchronize
to an external clock. In the MAX16833, the switching
frequency can be dithered for spread-spectrum applica-
tions. The MAX16833B instead provides a 1.64V refer-
ence voltage with a 2% tolerance.
The MAX16833/MAX16833B operate over a wide 5V to
65V supply range and include a 3A sink/source gate
driver for driving a power MOSFET in high-power LED
driver applications. Additional features include a fault-
indicator output (FLT) for short or overtemperature con-
ditions and an overvoltage-protection sense input (OVP)
for overvoltage protection. High-side current sensing
combined with a p-channel dimming MOSFET allow the
positive terminal of the LED string to be shorted to the
positive input terminal or to the negative input terminal
without any damage. This is a unique feature of the
MAX16833/MAX16833B.
Applications
Automotive Exterior Lighting:
High-Beam/Low-Beam/Signal/Position Lights
Daytime Running Lights (DRLs)
Fog Light and Adaptive Front Light Assemblies
Commercial, Industrial, and Architectural
Lighting
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
FUNCTIONALITY
MAX16833AUE+
-40NC to 16 TSSOP-
+125NC EP*
Frequency
Dithering
Ordering Information continued at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
S Boost, SEPIC, and Buck-Boost Single-Channel
LED Drivers
S +5V to +65V Wide Input Voltage Range with a
Maximum 65V Boost Output
S Integrated High-Side Current-Sense Amplifier
S ICTRL Pin for Analog Dimming
S Integrated High-Side pMOS Dimming MOSFET
Driver (Allows Single-Wire Connection to LEDs)
S Programmable Operating Frequency (100kHz to
1MHz) with Synchronization Capability
S Frequency Dithering for Spread-Spectrum
Applications (MAX16833)
S 2% Accurate 1.64V Reference (MAX16833B)
S Full-Scale, High-Side, Current-Sense Voltage of
200mV
S Short-Circuit, Overvoltage, and Thermal
Protection
S Fault Indicator Output
S -40NC to + 125NC Operating Temperature Range
S Thermally Enhanced 5mm x 4.4mm, 16-Pin TSSOP
Package with Exposed Pad
Simplified Operating Circuit
6V TO 18V WITH
LOAD DUMP
UP TO 70V
PWMDIM
IN
PWMDIM
NDRV
CS
OVP
ISENSE+
ISENSE-
DIMOUT
LED+
MAX16833
LED-
PGND
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or visit Maxim’s website at www.maxim-ic.com.