MAX16806EVMAXQUSB+【PDF 1/19 页】EVAL KIT FOR MAX16806

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ATION

EVALU

AVAIL

19-0625; Rev 1; 1/07

KIT

ABLE

EEPROM-Programmable, High-Voltage,

350mA LED Drivers with LED Current Foldback

General 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

Features

? EEPROM or I 2 C 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

dual-mode DIM pin and an on-board 200Hz ramp gen-

erator 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 min-

imizes 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 sup-

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

Ordering Information

plies necessary wetting current to a momentary switch.

Applications

PART

TEMP RANGE

PACKAGE

PKG

CODE

Automotive Interior: Map, Dome, and Courtesy

Lighting

Automotive Exterior:

Rear Combination Light (RCL)

Daytime Running Light (DRL)

MAX16805 ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5

MAX16806 ATP+ -40°C to +125°C 20 TQFN-EP** T2055M-5

+Denotes lead-free package.

**EP = Exposed pad.

Pin Configurations appear at end of data sheet.

Adaptive Front Light

Emergency Vehicle Warning Lights

Navigation and Marine Indicators

Typical Operating Circuits

+5.5V TO +40V

OUT

I LED

+5.5V TO +40V

OUT

I LED

0.1 μ F

SERIAL CLOCK

SCL

+5V REG

0.1 μ F

LEDs

V CC

0.1 μ F

+5V REG

0.1 μ F

LEDs

SERIAL DATA

SDA

MAX16805

CS+

CS-

R SENSE

MAX6613 ? OUT

GND

TFP/SCL

TFN/SDA

MAX16806

CS+

CS-

R SENSE

DIM

PWM DIMMING

GND

DIM

GND

ANALOG CONTROL PWM DIMMING

? MAX6613 THERMAL SENSOR IS OPTIONAL.

PWM CONTROL DIMMING

________________________________________________________________ Maxim Integrated Products

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.

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