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MAX8647

更新时间： 2024-11-19 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 驱动泵
页数 文件大小 规格书
15页 287K
描述
可驱动6只白光/RGB LED的超高效电荷泵，3mm x 3mm薄型QFN封装

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MAX8647 数据手册

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19-0790; Rev 1; 9/07  
Ultra-Efficient Charge Pumps for  
Six White/RGB LEDs in 3mm x 3mm Thin QFN  
7/MAX648  
General Description  
Features  
♦ Six Adaptive Current Regulators  
The MAX8647/MAX8648 drive up to six white LEDs or  
two sets of RGB LEDs with regulated constant current  
for display backlight and fun light applications. By utiliz-  
ing an inverting charge pump and extremely low-  
dropout adaptive current regulators, these ICs achieve  
very high efficiency over the full 1-cell Li+ battery volt-  
age range and even with large LED forward voltage  
mismatch. The 1MHz fixed-frequency switching allows  
for tiny external components. The regulation scheme is  
optimized to ensure low EMI and low input ripple. The  
MAX8647/MAX8648 include thermal shutdown, open-  
and short-circuit protection.  
♦ Independent Voltage Supply for Each LED  
♦ Individual LED Brightness Control (MAX8647)  
♦ 24mA to 0.1mA Dimming Range  
2
I C Interface (MAX8647)  
Serial-Pulse Dimming Logic (MAX8648)  
♦
2% Accuracy, 0.4% Matching (typ)  
♦ Low 70µA Quiescent Current  
♦ Low 1µA Shutdown Current  
♦ Inrush Current Limit  
♦ T Derating Function Protects LEDs  
♦ 16-Pin, 3mm x 3mm Thin QFN Package  
2
A
The MAX8647 features an I C serial port, while the  
MAX8648 features a three-wire serial-pulse logic inter-  
face. Both devices support independent on/off and  
dimming for main and subbacklights. The dimming  
ranges are pseudo-logarithmic from 24mA to 0.1mA  
and off in 32 steps. Both devices include a temperature  
derating function to safely allow bright 24mA full-scale  
output current setting while automatically reducing cur-  
rent to protect LEDs at high ambient temperatures  
above +60°C.  
Ordering Information  
PIN  
PACKAGE  
TOP  
PKG  
PART  
DIMMING  
MARK CODE  
2
MAX8647ETE+ I C interface 16 Thin QFN-EP* AFD  
T1633-5  
T1633-5  
Serial-pulse  
The MAX8647/MAX8648 are available in a 16-pin, 3mm  
x 3mm thin QFN package (0.8mm max height).  
MAX8648ETE+  
16 Thin QFN-EP* AFE  
logic  
Note: All devices are specified over the -40°C to +85°C extended  
temperature range.  
+Denotes a lead-free package.  
Applications  
White LED Backlighting, Single or Dual Display  
Wide-Gamut RGB LED Display Backlighting  
Camera Flash or RGB Indicators  
*EP = Exposed paddle.  
Typical Operating Circuit  
Cellular Phones and Smartphones  
1μF  
1μF  
PDAs, Digital Cameras, and Camcorders  
Pin Configuration  
C1P  
C1N C2P  
C2N  
NEG  
1μF  
INPUT  
2.7V TO 5.5V  
TOP VIEW  
IN  
EP  
1μF  
12  
11  
10  
9
GND  
WHITE  
OR RGB LED  
LED6  
NEG  
C1N  
C2N  
13  
14  
LED1  
8
7
6
5
MAX8648  
D1  
D2  
D3  
D4  
D5  
D6  
SDA (ENC)  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
MAX8647ETE  
MAX8648ETE  
SCL (ENB) 15  
16  
ENA  
ENB  
ENC  
V
DD  
(ENA)  
+
SERIAL-  
PULSE  
INTERFACE  
1
2
3
4
THIN QFN  
( ) DESIGNATE PINS ON THE MAX8648  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim's website at www.maxim-ic.com.  
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