http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




National Semiconductor Electronic Components Datasheet

LM27966 Datasheet

White LED Driver

No Preview Available !

LM27966 pdf
August 2006
LM27966
White LED Driver with I2C Compatible Interface
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 bright-
ness matching in all LEDs.
The LED driver current sources are split into two indepen-
dently controlled groups. The primary group, which can be
www.DataSheet4U.ccoomnfigured 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 regu-
lation 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 Lead-
less Leadframe Package (LLP-24).
Features
n 91% Peak LED Drive Efficiency
n No Inductor Required
n 0.3% Current Matching
n Drives 6 LEDs with up to 30mA per LED
n 180mA of total driver current
n I2C Compatible Brightness Control Interface
n Adaptive 1x- 3/2x Charge Pump
n Resistor-Programmable Current Settings
n External Chip RESET Pin (RESET)
n Extended Li-Ion Input: 2.7V to 5.5V
n Small low profile industry standard leadless package,
LLP 24 : (4mm x 4mm x 0.8mm)
Applications
n Mobile Phone Display Lighting
n PDAs Backlighting
n General LED Lighting
Typical Application Circuit
© 2006 National Semiconductor Corporation DS201901
20190101
www.national.com


National Semiconductor Electronic Components Datasheet

LM27966 Datasheet

White LED Driver

No Preview Available !

LM27966 pdf
Connection Diagram
24 Pin Quad LLP Package
NS Package Number SQA24A
www.DataSheet4U.com
Pin Descriptions
Pin #s
24
23
19, 22 (C1)
20, 21 (C2)
12, 13, 14, 15,
16
3
17
Pin Names
VIN
POUT
C1, C2
D5, D4, D3, D2,
D1
DAUX
ISET
1
2
7
10
9, 18, DAP
4, 5, 6, 8, 11
SCL
SDIO
VIO
RESET
GND
NC
Ordering Information
Order Information
LM27966SQ
LM27966SQX
20190102
Pin Descriptions
Input voltage. Input range: 2.7V to 5.5V.
Charge Pump Output Voltage
Flying Capacitor Connections
LED Drivers - Main Display
LED Driver - Indicator LED
Placing a resistor (RSET) between this pin and GND sets the full-scale LED
current for Dx , and DAUX LEDs.
LED Current = 200 x (1.25V ÷ RSET)
Serial Clock Pin
Serial Data Input/Output Pin
Serial Bus Voltage Level Pin
Harware Reset Pin. High = Normal Operation, Low = RESET
Ground
No Connect
Package
SQA24 LLP
Supplied As
1000 Units, Tape & Reel
4500 Units, Tape & Reel
www.national.com
2


Part Number LM27966
Description White LED Driver
Maker National Semiconductor
Total Page 13 Pages
PDF Download
LM27966 pdf
Download PDF File
[partsNo] view html
View PDF for Mobile






Related Datasheet

1 LM2796 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost National Semiconductor
National Semiconductor
LM2796 pdf
2 LM2796 LM2796 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost (Rev. A) Texas Instruments
Texas Instruments
LM2796 pdf
3 LM27961 LM27961 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost (Rev. A) Texas Instruments
Texas Instruments
LM27961 pdf
4 LM27961 Dual-Display White National Semiconductor
National Semiconductor
LM27961 pdf
5 LM27964 LM27964 White LED Driver System with I2C Compatible Brightness Control (Rev. D) Texas Instruments
Texas Instruments
LM27964 pdf
6 LM27964 White LED Driver System National Semiconductor
National Semiconductor
LM27964 pdf
7 LM27965 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control (Rev. B) Texas Instruments
Texas Instruments
LM27965 pdf
8 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control National Semiconductor
National Semiconductor
LM27965 pdf
9 LM27966 LM27966 White LED Driver with I2C Compatible Interface (Rev. B) Texas Instruments
Texas Instruments
LM27966 pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components