LP3943 - RGB/White/Blue 16-LED Fun Light Driver from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Application Notes Knowledge Base

Features
Internal power-on reset
Active low reset
Internal precision oscillator
Variable dim rates (from 6.25 ms to 1.6s; 160 Hz-0.625 Hz)

Key Specification


16 LED driver (multiple programmable states-on, off, input, and dimming at a specified rate)
16 Open drain outputs capable of driving up to 25 mA per LED

General Description


LP3943 is an integrated device capable of independently driving 16 LEDs. More...


Applications


Customized flashing LED lights for cellular phones
Portable Applications
Digital Cameras
Indicator Lamps
General purpose I/O expander
Toys
  Typical Application
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ParametersValues
Regulated LEDs 16
LED Configuration Parallel
Current Matching 0.30%
Boost Type Inductive
Switching Frequency Undefined kHz
Switching Type Fixed Freq
Total LED Current Undefined mA
Efficiency (peak) Undefined %
Boost Voltage Regulated
Supply Current Undefined mA
Input Min Voltage 2.3 Volt
Input Max Voltage 5.5 Volt
OutputMax Voltage Undefined Volt
PWM BrightCtrl Yes
Analog-V BrightCtrl No
Ambient Light Compensation No
RGB-LED Yes
Temperature Min -40 deg C
Temperature Max 85 deg C
RegType Lighting Management Unit
PowerWise Yes


Typical Performance


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  Also Recommended
LP39448 LEDs
Additional Resources
Application Notes


Block Diagram


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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP3943 RGB/White/Blue 16-LED Fun Light Driver 264
Kbytes
21-Nov-03 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LP3943ISQEVRGB/White/Blue 16-LED Fun Light DriverFull productionN/A
 
Buy Now
1+$142.001-
6 weeksN/A
LP3943ISQLLP24NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.30reel
of
1000
NS
UZXYTT
3943SQ
6 weeks2500
LP3943ISQXLLP24NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.30reel
of
4500
NS
UZXYTT
3943SQ
6 weeks20000

General Description


LP3943 is an integrated device capable of independently driving 16 LEDs. This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3943 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic.

Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus. LP3943 instead requires only the setup of the frequency and duty cycle for each output pin. From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25 mA per pin and 200 mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LP3943ISQCMOS70184060010890004309006723
LP3943ISQXCMOS70184060010890004309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1300: Application Note 1300 LP3943 Evaluation Kit 466
Kbytes
20-Oct-04 Download
AN-1715: Application Note 1715 LP3943/LP3944 as a GPIO Expander 93
Kbytes
12-Oct-07 Download
AN-1715 (Chinese): Application Note 1715 LP3943/LP3944 as a GPIO Expander
252 Kbytes  

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1296: Application Note 1296 LP3945/LP3946 Evaluation Kit 280
Kbytes
17-Sep-04 Download
AN-1344: Application Note 1344 LP3944 Evaluation Kit 366
Kbytes
20-Oct-04 Download
AN-1341: Application Note 1341 LP3947 Evaluation Board 584
Kbytes
18-Nov-04 Download

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[Information as of 8-Nov-2009]