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LM2755

更新时间： 2024-09-26 11:11:47
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德州仪器 - TI 控制器泵
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22页 607K
描述
采用微型 SMD 封装、具有 I2C 兼容接口的电荷泵 LED 控制器

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LM2755 数据手册

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LM2755  
www.ti.com  
SNVS433D –OCTOBER 2007–REVISED APRIL 2013  
LM2755 Charge Pump LED Controller with I2C-Compatible Interface in DSBGA Package  
Check for Samples: LM2755  
1
FEATURES  
DESCRIPTION  
The LM2755 is a charge-pump-based, constant  
current LED driver capable of driving 3 LEDs with a  
total output current up to 90mA. The diode current  
waveforms of each LED can be trapezoidal with  
timing and level parameters (rise time, fall time, high  
level, low level, delay, high time, low time)  
programmed via an I2C-compatible interface. The 32  
brightness levels found on the LM2755 are  
exponentially spaced (as opposed to linearly spaced)  
to better match the response of the human eye to  
changing brightness levels.  
2
•
90% Peak Efficiency  
•
•
Total solution size < 13mm2  
No Inductor Required: Only 4 Inexpensive  
Ceramic Caps  
•
•
•
3 Independently Controlled Constant Current  
Outputs  
Programmable Trapezoidal Dimming  
Waveform on Each Output  
Programmable Timing Control Via Internal  
Registers and External Clock Synchronization  
Input  
The device requires only four small and low-cost  
ceramic capacitors. The LM2755 provides excellent  
efficiency without the use of an inductor by operating  
the charge pump in a gain of 3/2 or in a gain of 1.  
Maximum efficiency is achieved over the input  
voltage range by actively selecting the proper gain  
based on the LED forward voltage requirements.  
•
•
32 Exponential Dimming Steps with 800:1  
Dimming Ratio  
Programmable Brightness Control via I2C-  
Compatible Interface  
•
•
•
Hardware Enable Pin  
The pre-regulation scheme used by the LM2755 is  
optimized to ensure low conducted noise on the  
input. An internal soft-start circuitry eliminates high  
inrush current at start-up. The LM2755 consumes  
3µA (typ.) of supply current in shut-down.  
Wide Input Voltage Range: 2.7V to 5.5V  
Tiny 18-bump Thin DSBGA : 1.8mm x 1.6mm x  
0.6mm  
APPLICATIONS  
The LM2755 is available in Texas Instruments' tiny  
18-bump thin DSBGA package.  
•
•
•
•
Indicator LEDs  
Keypad LED Backlight  
Display LED Backlight  
Fun-light LEDs  
TYPICAL APPLICATION CIRCUIT  
0.47 mF  
0.47 mF  
3.1 mm  
C2  
C
OUT  
C1- C1+ C2- C2+  
V
P
OUT  
IN  
C1  
1 mF  
1 mF  
C
IN  
ADR  
VIO  
SCL  
SDIO  
SYNC  
LM2755  
SCL  
R
SET  
SDIO  
D1  
D2  
D3  
HWEN  
VIO  
Dx Pins  
SYNC  
HWEN  
I
SET  
GND ADDR  
Capacitors:  
TDK C1005X5R1A105M and C1005X5R1A474M ,  
or 1 mF and 0.47 mF single capacitor equivalent  
12.5 kW  
Figure 1. Typical Application Circuit  
Figure 2. Minimum Solution Size  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007–2013, Texas Instruments Incorporated  
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LM2756_0712 NSC

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 		Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in micro SMD
LM2756TM NSC

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LM2756TM/NOPB TI

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 		Multi-Display Inductorless LED Driver with 32

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