MAX16804ATP Datasheet, PDF (1/10 Pages) Maxim Integrated Products – High-Voltage, 350mA LED Driver with Analog and PWM Dimming Control

19-0589; Rev 1; 5/08
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
General Description
The MAX16804 current regulator operates from a 5.5V to
40V input voltage range and delivers 35mA to 350mA to
one or more strings of high-brightness LEDs (HB LEDs).
The output current of the MAX16804 is set by using an
external current-sense resistor in series with the LEDs. A
dual-mode DIM pin and on-board 200Hz ramp generator
allow PWM dimming with an analog or PWM input signal.
The analog control signal at dimming input DIM allows for
a theater-dimming effect to be implemented. Fast turn-on
and turn-off times ensure a wide-range PWM operation,
while wave-shaping circuitry minimizes EMI. The differen-
tial current-sense input increases LED current accuracy
and noise immunity. The MAX16804 is well suited for
applications requiring high-voltage input and is able to
withstand automotive load-dump events up to 45V. An
on-board pass element minimizes external components
while providing 3% output-current accuracy. Additional
features include a 5V regulated output and short-circuit
and thermal protection.
The MAX16804 is available in a thermally enhanced,
5mm x 5mm, 20-pin TQFN package and is specified over
the automotive -40°C to +125°C temperature range.
Applications
Automotive Interior: Map, Dome, and Courtesy
Lighting
Automotive Exterior:
Rear Combination Light (RCL)
Daytime Running Light (DRL)
Adaptive Front Light
Warning Lights for Emergency Vehicles
Navigation and Marine Indicators
Signage, Canopies, and Beacons
+5.5V TO +40V
IN
0.1μF
V5
EN
ILED
OUT
+5V REG
V5
0.1μF
MAX16804 _CS+
DIM
GND
CS-
LEDs
RSENSE
Features
o Flexible Dimming Control, Analog or PWM
Control Signal for PWM and Theater Dimming
o 200Hz On-Board Ramp Generator
o Syncs to External PWM Signal (Up to 2kHz)
o 5.5V to 40V Operating Range
o 35mA to 350mA Adjustable LED Current
o 3% LED Current Accuracy
o High-Voltage (Up to 40V) DIM Pin
o Integrated Pass Element with Low-Dropout
Voltage (0.5V typ)
o Additional +5V On-Board Regulator with 2mA
Capability
o Differential LED Current Sense
o Low 200mV Current-Sense Reference Reduces
Power Losses
o Wave-Shaped Edges Minimize EMI During PWM
Dimming
o Output Short-Circuit and Thermal-Shutdown
Protection
o Available in Small, Thermally Enhanced,
5mm x 5mm, 20-Pin TQFN Package
o -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16804ATP+
-40°C to +125°C 20 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Simplified Diagrams
+5.5V TO +40V
IN
0.1μF
EN
ILED
OUT
+5V REG
V5
0.1μF
MAX16804
CS+
PWM DIMMING
DIM
GND
CS-
LEDs
RSENSE
ANALOG CONTROL PWM DIMMING
PWM CONTROL DIMMING
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.