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MAX16805, MAX16806
EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback
High-Current Linear LED Drivers Eliminate the Need for µC or Switch-Mode Converter
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Status
Active: In Production.
Description
The MAX16805/MAX16806 LED drivers eliminate the need for microcontrollers or switch-mode converters for automotive interior dome, map, and courtesy light applications. An EEPROM-programmable LED current-sense reference simplifies production by using one sense resistor to set the LED current for all LED bins. A dual-mode DIM pin and an on-board 200Hz ramp generator allow for PWM dimming with an analog or PWM control signal. The analog control signal at dimming input DIM allows for the "theater dimming" effect to be implemented. Fast turn-on/-off times ensure a wide-range PWM operation, while waveshaping circuitry minimizes EMI. EEPROM-programmable LED current foldback makes it possible to operate at a high input voltage, while saving the cost and space associated with having a large heatsink. The MAX16806 works with an external thermal sensor to maintain maximum LED junction temperature by folding back the LED current. The thermal foldback temperature knee and slope are EEPROM programmable. The MAX16806 SW pin supplies necessary wetting current to a momentary switch.
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Data Sheet
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An evaluation kit is available: MAX16806EVCMAXQU, MAX16806EVKIT
Key Features
- EEPROM or I²C Dynamically Programmable:
- LED Current Foldback for High Input Voltage
- LED Current Reference
- LED Current Thermal Foldback (MAX16806)
- On-Board 200Hz Ramp Generator Eliminates the Need for µC PWM Signal
- Flexible Analog or PWM Control for PWM or Theater Dimming
- Wetting Current and Debounce for Momentary Switch (MAX16806)
- 5.5V to 40V Input with Up to 39V Output Capability
- 35mA to 350mA Adjustable LED Current
- Waveshaping Minimizes EMI During Dimming
- Output Short-Circuit and Overtemperature Protection
- -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
- Emergency Vehicle Warning Lights
- Navigation and Marine Indicators
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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 |
| MAX16805 |
Linear |
40 |
6.5 |
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0.35 |
38.6 |
Yes |
2 |
200 |
Yes |
$1.42 @1k |
| MAX16806 |
$1.49 @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
 Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-0625
Rev 1;
2007-01-16
This page last modified: 2010-06-03
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