MAX16824/MAX16825

High-Voltage, Three-Channel Linear

High-Brightness LED Drivers

EVALUATION KIT AVAILABLE

19-1107; Rev 3; 1/13

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX16824/MAX16825 three-channel LED drivers

operate over a 6.5V to 28V input voltage range. These

devices provide three open-drain constant-current-sink-

ing outputs that are rated to 36V and deliver up to

150mA of current to each string of high-brightness LEDs

(HB LEDs). The current at each output is programmable

by means of an external current-sense resistor. The

MAX16824 features three PWM inputs that control the

duty cycle of the output current, allowing a wide LED

dimming range to be implemented. The PWM inputs

also function as on/off control for each corresponding

output. The MAX16825 offers a 4-wire serial interface, a

3-bit shift register, and a 3-bit transparent latch. The ser-

ial interface allows a microcontroller to configure the out-

put channels using four inputs (DIN, CLK, LE, OE) and a

data output (DOUT). DOUT allows multiple drivers to be

cascaded and operated together.

The MAX16824/MAX16825’s on-board pass elements

minimize the need for external components, while at the

same time, providing ±5% LED current accuracy.

Additional features include a +5V (±5%) regulated output

with 4mA output current capability and thermal protection.

The MAX16824/MAX16825 are available in a thermally

enhanced 16-pin TSSOP-EP package and specified over

the -40°C to +125°C temperature range.

Applications

Industrial Lighting

Architectural and Decorative Lighting

Mood Lighting

Indoor and Outdoor LED Video Displays

Automotive Lighting

LCD Display Backlighting

Features

o 6.5V to 28V Operating Range

o Outputs Connected to 36V Supply for Long LED

Strings

o Three 36V-Rated Output Channels with

Independently Adjustable LED Current

o 150mA Output Current Per Channel

o ±5% LED Current Accuracy

o PWM Dimming

Three Independent Dimming Control Inputs

(MAX16824)

4-Wire Serial Interface LED Current Chopping

(MAX16825)

o +5V (±5%) Regulated Output with 4mA Source

Capability

o Fast Transient Dimming Response

o 200mV Current-Sense Reference Reduces Power

Loss

o Thermal Shutdown

o -40°C to +125°C Operating Temperature Range

o Thermally Enhanced, 16-Pin TSSOP Exposed Pad

Package

OUT1

OUT3

OUT2

CS1

CS2

CS3

IN

1

16

3

7

8

9

4

11

12

2

15

13

PWM1

PWM2

PWM3

REG

GND

UP TO 36V

MAX16824

Typical Operating Circuits

Ordering Information

PART

TEMP RANGE

PIN PACKAGE

MAX16824AUE+

-40°C to +125°C

16 TSSOP-EP*

MAX16824AUE/V+

-40°C to +125°C

16 TSSOP-EP*

MAX16825AUE+

-40°C to +125°C

16 TSSOP-EP*

+

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

*

EP = Exposed pad.

/V denotes an automotive qualified part.

Pin Configurations appear at end of data sheet.

OUT1

OUT3

OUT2

CS1

CS2

CS3

IN

CLK

DIN

LE

REG

GND

OE

MICROCONTROLLER

MAX16825

1

16

3

6

7

8

9

4

11

12

2

15

13

UP TO 36V