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LM27952

更新时间： 2024-09-26 11:13:51
品牌 Logo 应用领域
德州仪器 - TI 开关驱动电容器驱动器
页数 文件大小 规格书
18页 1031K
描述
输入电压范围为 3V 至 5.5V 的白光 LED 自适应 1.5X/1X 开关电容器电流驱动器

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LM27952 数据手册

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LM27952  
www.ti.com  
SNVS364B –MAY 2005–REVISED MAY 2013  
LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver  
Check for Samples: LM27952  
1
FEATURES  
APPLICATIONS  
2
•
•
Drives up to 4 LEDs with up to 30mA each  
•
•
•
White LED Display Backlights  
White LED Keypad Backlights  
General Purpose LED Lighting  
Regulated current sources with 0.2%(typ.)  
matching  
•
•
•
•
•
•
•
•
3/2x, 1x Gain transition based on LED VF  
Peak Efficiency Over 85%  
DESCRIPTION  
The LM27952 is a switched capacitor white-LED  
driver capable of driving up to 4 LEDs with 30mA  
through each LED. Its 4 tightly regulated current sinks  
ensure excellent LED current and brightness  
matching. LED drive current is programmed by an  
external sense resistor. The LM27952 operates over  
an input voltage range from 3.0V to 5.5V and requires  
only four low-cost ceramic capacitors.  
Input Voltage Range: 3.0V to 5.5V  
PWM Brightness Control  
Very Small Solution Size - NO INDUCTOR  
Fixed 750kHz Switching Frequency  
<1µA Shutdown Current  
14-pin WSON Package: 4.0mm X 3.0mm X  
0.8mm  
The LM27952 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.  
Typical Application Circuit  
V
= 3.0V - 5.5V  
3.3 µF  
IN  
V
V
OUT  
IN  
D
4
C +  
1
C
IN  
3.3 µF  
D
3
C
OUT  
1 µF  
1 µF  
C
1
D
2
C -  
1
D4  
D3  
D2  
D1  
D
1
C +  
2
LM27952  
C
2
C -  
2
I
= 30 mA max  
DX  
I
PWM  
EN  
SET  
GND  
R
SET  
Capacitors: 1 µF - TDK C1608X7R1A105K  
3.3 µF - TDK C2012X7R1A335K  
or equivalent  
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 © 2005–2013, Texas Instruments Incorporated  
1234567...18

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