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NCP1840
8-Channel Programmable
LED Driver
The NCP1840 is a general purpose LED driver that allows for full
programmability of eight separate LED channels through a simple I 2 C
serial communication interface. The current through each of the
channels can be up to 30 mA and is controlled via constant current
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regulation. Each channel has programmable Pulse ? Width Modulation
(PWM) control along with programmable current control, allowing
for very flexible, optimized LED brightness and color control.
Logarithmic output current levels are achieved to best accommodate
natural eye viewing.
A QUAD ? MODE ? charge pump allows for higher forward voltage
LEDs and/or multiple LEDs in series per channel to be driven with a
low ? voltage supply. This makes the NCP1840 capable of efficiently
QFN20
4 x 4 mm
CASE 485E
1
MARKING
DIAGRAM
20
NCP
1840
ALYW G
G
driving LEDs in applications that are running off of low ? voltage
processor supply levels along with battery ? powered applications. Few
external components are required making this a very cost ? effective
solution for multi ? channel LED driving.
Features
? Individual Current Level Programmability (5 ? bit) per Channel
? Individual PWM Programmability (6 ? bit) per Channel
? I 2 C Serial Communication Interface for Programming
? Constant Current Regulated Outputs ? 30 mA Maximum per Channel
? Logarithmic Output Current Levels
? External Resistor for Setting Full ? Scale Current for all Channels
? Low Noise QUAD ? MODE Charge Pump Delivers > 90% Efficiency
? High LED Forward ? Voltage Compliant ? up to 4.1 V
? Soft ? Start POR Reduces Noise
? Registers are Write/Read
? Fault and Thermal Protection
? Small QFN Package
? These are Pb ? Free Devices
NCP1840 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb ? Free Package
(*Note: Microdot may be in either location)
ORDERING INFORMATION
Device Package Shipping ?
NCP1840Q8A6MNG QFN20 490 / Tray
(Pb ? Free)
NCP1840Q8A6MNTWG QFN20 2500 / Tape &
(Pb ? Free) Reel
?For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Typical Applications
? Status or Diagnostic Indicators
? Portables (Notebook Battery Monitors, Handheld
Equipment Testers, etc.)
? Computing (Servers, Workstations, etc.)
? Electronic Payment Systems
? Decorative Lighting
? Toys and Gaming ? “Fun Lighting”
? Semiconductor Components Industries, LLC, 2013
February, 2013 ? Rev. 3
1
?
?
? Electronic Musical Instruments
? Aftermarket Automotive Trim
? Keypad Lighting
Small ? Format Display Drivers
? Tablet PCs and PDAs
? Smart Phones
“True Green” LED Applications
Publication Order Number:
NCP1840/D
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