Rainbow Electronics MAX16825 - Manual

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
♦ 6.5V to 28V Operating Range
♦ Outputs Connected to 36V Supply for Long LED
Strings
♦ Three 36V-Rated Output Channels with
Independently Adjustable LED Current
♦ 150mA Output Current Per Channel
♦ ±5% LED Current Accuracy
♦ PWM Dimming
Three Independent Dimming Control Inputs
(MAX16824)
4-Wire Serial Interface LED Current Chopping
(MAX16825)
♦ +5V (±5%) Regulated Output with 4mA Source
Capability
♦ Fast Transient Dimming Response
♦ 200mV Current-Sense Reference Reduces Power
Loss
♦ Thermal Shutdown
♦ -40°C to +125°C Operating Temperature Range
♦ Thermally Enhanced, 16-Pin TSSOP Exposed
Paddle Package
MAX16824/MAX16825
High-Voltage, Three-Channel Linear
High-Brightness LED Drivers
________________________________________________________________ Maxim Integrated Products 1
19-1107; Rev 1; 1/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
OUT1
OUT3
OUT2
CS1
CS2
CS3
IN
1
16
3
7
8
9
4
11
12
2
15
13
PWM1
PWM2
PWM3
REG
GND
C REG
C IN
V IN
UP TO 36V
R CS2
R CS1
R CS3
MAX16824
Typical Operating Circuits
Ordering Information
PART TEMP RANGE
PIN
PACKAGE PKG
CODE
MAX16824AUE+ -40°C to +125°C 16 TSSOP-EP* U16E-3
MAX16825AUE+ -40°C to +125°C 16 TSSOP-EP* U16E-3
+ Denotes a lead-free package.
* EP = Exposed paddle.
Pin Configurations appear at end of data sheet.
OUT1
OUT3
OUT2
CS1
CS2
CS3
IN
CLK
DIN
LE
REG
GND
C REG
C IN
V IN
R CS2
R CS1
R CS3
OE
MICROCONTROLLER
MAX16825 1
16
3
6
7
8
9
4
11
12
2
15
13
UP TO 36V