LM27966 - White LED Driver with I2C Compatible Interface from the PowerWise® Family
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•91% Peak LED Drive Efficiency
•No Inductor Required
•0.3% Current Matching
•Drives 6 LEDs with up to 30mA per LED
•180mA of total driver current
•I2C Compatible Brightness Control Interface
•Adaptive 1×- 3/2× Charge Pump
•Resistor-Programmable Current Settings
•External Chip RESET Pin (RESET#)
•Extended Li-Ion Input: 2.7V to 5.5V
•Small low profile industry standard leadless package, LLP 24 : (4mm x 4mm x 0.8mm)

General Description

The LM27966 is a highly integrated charge-pump-based display LED driver. More...


Applications

•Mobile Phone Display Lighting
•PDAs Backlighting
•General LED Lighting
  Typical Application
click for larger image


ParametersValues
Regulated LEDs 6
Total LED Current 180 mA
Current Matching 0.3%
Boost Type Switched Capacitor Multi-Gain
Switching Frequency 1270 kHz
Efficiency (peak) 91 %
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Boost Voltage Regulated
LED Configuration Parallel
Supply Current 2.9 mA
Switching Type Fixed Freq
Special Features Current regulated outputs, Common anode current sink topology, I2C compatible interface
PWM BrightCtrl Yes
Analog-V BrightCtrl Yes
Ambient Light Compensation No
RGB-LED No
Temperature Min -30 deg C
Temperature Max +85 deg C
RegType WhiteLED Driver
PowerWise Yes


Typical Performance

click for larger image


  Additional Resources
Application Notes


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM27966 White LED Driver with I2C Compatible Interface 677
Kbytes		 3-Aug-06 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
LM27966SQLLP24NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.44reel
of
1000		NS
UZXYTT
L27966S
6 weeks7500
LM27966SQXLLP24NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.44reel
of
4500		NS
UZXYTT
L27966S
12 weeksN/A

General Description

The LM27966 is a highly integrated charge-pump-based display LED driver. The device can drive up to 6 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs.

The LED driver current sources are split into two independently controlled groups. The primary group, which can be configured with 4 or 5 LEDs, can be used to backlight the main phone display. An additional, independently controlled led driver is provided for driving an indicator or other general purpose LED function. The LM27966 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM27966 is available in National's small 24-pin Leadless Leadframe Package (LLP-24).

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM27966SQCMOS70184060010890004309006723
LM27966SQXCMOS70184060010890004309006723

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.


More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1321: Application Note 1321 LM2796 Evaluation Board 453
Kbytes		 25-May-04 Download
AN-1362: Application Note 1362 LM27961- Dual-Display White LED Driver with 3/2x Switched Capacitor Boost 625
Kbytes		 30-Jun-05 Download
AN-1362 (Chinese): Application Note 1362 LM27961- Dual-Display White LED Driver with 3/2x Switched Capacitor Boost
 276 Kbytes  
AN-1582: Application Note 1582 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control 1226
Kbytes		 18-Mar-07 Download
AN-1582 (Chinese): Application Note 1582 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control
 503 Kbytes  

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

[Information as of 7-Nov-2009]