MAX16806 データシートの表示（PDF） - Maxim Integrated

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MAX16806

EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

Maxim Integrated 

MAX16805/MAX16806

EVALUATION KIT AVAILABLE

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. An

EEPROM-programmable LED current-sense reference sim-

plifies 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 main-

tain 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.

Applications

●● Emergency Vehicle Warning Lights

●● Navigation and Marine Indicators

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

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

MAX16805ATP+

-40°C to +125°C 20 TQFN-EP*

MAX16806ATP+

-40°C to +125°C 20 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits

+5.5V TO +40V

0.1µF

SERIAL CLOCK

SERIAL DATA

V5

IN

ILED

OUT

+5V REG

EN

V5

0.1µF

SCL

MAX16805

SDA

CS+

LEDs

RSENSE

CS-

DIM

GND

+5.5V TO +40V

V5

0.1µF

VCC

MAX6613† OUT

GND

PWM DIMMING

IN

EN

MAX16806

TFP/SCL

ILED

OUT

+5V REG

V5

0.1µF

CS+

TFN/SDA

CS-

SW

DIM

GND

LEDs

RSENSE

ANALOG CONTROL PWM DIMMING

†MAX6613 THERMAL SENSOR IS OPTIONAL.

PWM CONTROL DIMMING

19-0625; Rev 2; 9/14

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