Datasheet
Package Availability, Models, Samples & Pricing
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) |
|
LM27966SQ | CMOS7 | 0 | 16561 | 0 | 0 | 954000 | 4 | 270700104
|
|
LM27966SQX | CMOS7 | 0 | 16561 | 0 | 0 | 954000 | 4 | 270700104
|
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
| Title | Size in Kbytes |
Date |
 |
| 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 |
|
|
[Information as of 4-Jul-2009]
|
RoHS Compliance Information
