MAX16833_11 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – High-Voltage HB LED Drivers with Integrated High-Side Current Sense

19-5187; Rev 3; 7/11
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High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
General Description
The MAX16833/MAX16833B/MAX16833C/MAX16833D/
MAX16833E are peak current-mode-controlled LED driv-
ers 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 pro-
vides 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 ICs provide analog dim-
ming using a DC input at ICTRL. The ICs sense the LED
current 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 ICs to synchronize to an external clock. In
the MAX16833/MAX16833C/MAX16833E, the switching
frequency can be dithered for spread-spectrum applica-
tions. The MAX16833B/MAX16833D instead provide a
1.64V reference voltage with a 2% tolerance.
The ICs 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 applica-
tions. Additional features include a fault-indicator output
(FLT) for short or overtemperature conditions 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 termi-
nal or to the negative input terminal without any damage.
This is a unique feature of the ICs.
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
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/MAX16833C/MAX16833E)
S 2% Accurate 1.64V Reference (MAX16833B/
MAX16833D)
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
NDRV
CS
OVP
PWMDIM
ISENSE+
ISENSE-
DIMOUT
MAX16833
LED+
PGND
LED-
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16833AUE+
-40°C to +125°C ^{16 TSSOP-EP*}
MAX16833AUE/V+ _{-40°C to +125°C} 16 TSSOP-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
FUNCTIONALITY
Frequency Dithering
Frequency Dithering
MAX DUTY CYCLE
(%)
88.5
88.5
FAULT OUTPUT
BLANKING
Yes
Yes
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