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MAX16804
High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control
350mA High-Brightness LED Driver with On-Board 200Hz Ramp Generator Eliminates the Need for µC's PWM Dimming Signal, Simplifies LED Lighting Applications, Minimizes External Part Counts, and Saves Cost and Space
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Status
Active: In Production.
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 differential 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.
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Data Sheet
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Key Features
- Flexible Dimming Control, Analog or PWM Control Signal for PWM and Theater Dimming
- 200Hz On-Board Ramp Generator
- Syncs 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
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Applications/Uses
- Automotive Exterior: Rear Combination Light (RCL), Daytime Running Light (DRL), Adaptive Front Light
- Automotive Interior: Map, Dome, and Courtesy Lighting
- Navigation and Marine Indicators
- Signage, Canopies, and Beacons
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Key Specifications:
| High Brightness LED Drivers |
| Part Number |
Topology |
Device VIN
(V) |
Device VIN
(V) |
LED Channels |
ILED per Channel
(A) |
LED String Volt.
(V) |
Internal Pwr. MOSFETs |
PWM Dimming Freq.
(kHz) |
PWM Dimming Ratio |
EV Kit |
Budgetary Price |
| max |
min |
max |
max |
max |
max |
See Notes |
| MAX16804 |
Linear |
40 |
6.5 |
|
0.35 |
38.6 |
Yes |
2 |
200 |
Yes |
$1.31 @1k |
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See All High Brightness LED Drivers (25)
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Pricing 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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Diagram
 Simplified Diagrams
More Information
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Information Index
Document Ref.: 19-0589
Rev 1;
2008-06-17
This page last modified: 2010-04-29
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