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PDF MAX16804 Data sheet ( Hoja de datos )
| Número de pieza | MAX16804 | |
| Descripción | 350mA LED Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0589; Rev 0; 7/06
www.DataSheet4U.com
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
♦ Flexible Dimming Control, Analog or PWM
Control Signal for PWM and Theater Dimming
♦ 200Hz On-Board Ramp Generator
♦ Sinks to External PWM Signal (Up to 2kHz)
♦ 5.5V to 40V Operating Range
♦ 35mA to 350mA Adjustable LED Current
♦ 3% LED Current Accuracy
♦ High-Voltage (Up to 40V) DIM Pin
♦ Integrated Pass Element with Low-Dropout
Voltage (0.5V typ)
♦ Additional +5V On-Board Regulator with 2mA
Capability
♦ Differential LED Current Sense
♦ Low 200mV Current-Sense Reference Reduces
Power Losses
♦ Wave-Shaped Edges Minimize EMI During PWM
Dimming
♦ Output Short-Circuit and Thermal-Shutdown
Protection
♦ Available in Small, Thermally Enhanced,
5mm x 5mm, 20-Pin TQFN Package
♦ -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX16804ATP+ -40°C to +125°C 20 TQFN-EP* T2055M-5
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Simplified Diagrams
+5.5V TO +40V
0.1μF
IN
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/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Typical Operating Characteristics (continued)
(VIN = 12V, VEN = VIN, CV5 = 0.1µF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, connect OUT to CS+, VDIM = 4V, TA = +25°C, unless
otherwise noted.)
OUTPUT CURRENT DUTY CYCLE
vs. ANALOG DIM VOLTAGE
120
VIN = 12V
100
80
60
40
20
0
01234
ANALOG DIM VOLTAGE (V)
IDIM vs. VDIM
300
VIN = 16V
250
200
150
100
50
0
0 2 4 6 8 10 12 14 16
VDIM (V)
PIN
1, 20
2, 3
4, 9, 11, 18
5–8, 10, 16
12, 15
13
14
17
19
—
NAME
OUT
IN
N.C.
GND
V5
CS+
CS-
DIM
EN
EP
Pin Description
FUNCTION
Current-Regulated Output. Connect pin 1 to pin 20.
Input Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin 3.
No Connection. Leave unconnected (internal connection).
Ground
+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.
Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+
and CS- to program the output current level.
Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between
CS- and CS+ to program the output current level.
Dimming Input. See the Dimming Input (DIM) section.
Enable Input. Drive EN high to enable the output and the 5V LDO.
Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only
ground connection.
_______________________________________________________________________________________ 5
5 Page 
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High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2006 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
Heaney
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX16804.PDF ] | |
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