MAX16824 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – High-Voltage, Three-Channel Linear High-Brightness LED Drivers

19-1107; Rev 0; 11/07
High-Voltage, Three-Channel Linear
High-Brightness LED Drivers
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 2Mbps, 4-wire serial
interface, a 3-bit shift register, and a 3-bit transparent
latch. The serial interface allows a microcontroller to
configure the output 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 +85°C temperature range.
Applications
Industrial Lighting
Architectural and Decorative Lighting
Mood Lighting
Indoor and Outdoor LED Video Displays
Automotive Lighting
LCD Display Backlighting
VIN
CIN
UP TO 36V
3 _IN
OUT1 ¹
7 _{PWM1 MAX16824}
8
OUT2 ¹⁶
PWM2
9
PWM3
4 _REG
CREG
11 _GND
12
OUT3
CS1 ²
CS2 ¹⁵
13
CS3
RCS3
RCS2
RCS1
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 +85°C Operating Temperature Range
♦ Thermally Enhanced, 16-Pin TSSOP Exposed
Paddle Package
Ordering Information
PART
TEMP RANGE
PIN
PACKAGE
PKG
CODE
MAX16824EUE+ -40°C to +85°C 16 TSSOP-EP* U16E-3
MAX16825EUE+ -40°C to +85°C 16 TSSOP-EP* U16E-3
+Denotes a lead-free package.
*EP = Exposed paddle.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits
VIN
UP TO 36V
CIN
MICROCONTROLLER
CREG
3 _IN
MAX16825 OUT1 ¹
6
CLK
7
DIN
8
LE
9
OE
4
REG
11
GND
OUT2 ¹⁶
12
OUT3
2
CS1
15
CS2
13
CS3
RCS2
RCS1
RCS3
________________________________________________________________ Maxim Integrated Products 1
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.