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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
Table 2. I 2 C Control Data Byte—Device Address 0x9A
SDA CONTROL BYTE
FUNCTION
Not used
C2
0
COMMAND
C1
0
C0
0
D4
—
D3
—
DATA
D2
—
D1
—
D0
—
LED1 current
LED2 current
LED3 current
LED4 current
LED5 current
LED6 current
0
0
0
1
1
1
0
1
1
0
0
1
1
0
1
0
1
0
24.0mA to 0.1mA and off in 32 steps
24.0mA to 0.1mA and off in 32 steps
24.0mA to 0.1mA and off in 32 steps
24.0mA to 0.1mA and off in 32 steps
24.0mA to 0.1mA and off in 32 steps
24.0mA to 0.1mA and off in 32 steps
Not used
1
1
1
—
—
—
—
—
Note: C2 is MSB and D0 is LSB. The power-on default settings for D4 to D0 are all 0, which indicates that all LED_ are off.
Table 3. MAX8647 I 2 C Data vs. LED Currents
D4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
mA
24
22.4
20.8
19.2
17.6
16
14.4
12.8
11.2
9.6
8
6.4
5.6
4.8
4
3.2
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
mA
2.8
2.4
2
1.6
1.4
1.2
1
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
OFF
Temperature Derating Function
The MAX8647/MAX8648 contain a derating function that
automatically limits the LED current at high temperatures
to help protect the LEDs from damage. The derating
function enables the safe usage of higher LED current at
room temperature, thus reducing the number of LEDs
required to backlight the display. The derating circuit
lowers the LED current at approximately 2.5%/°C once
the IC is above +60°C. The typical derating function
characteristic is shown in the Typical Operating
Characteristics.
Power-Up LED Detection and
Fault Protection
The MAX8648 contains special circuitry to detect short-
circuit conditions at power-up and disable the corre-
sponding current regulator to avoid wasting battery
current. Connect any unused LED_ to IN to disable the
corresponding current regulator. If an LED fails short
circuit, the current regulator continues the current regu-
lated operation until power to the IC is cycled and the
short circuit is detected. An open-circuit LED failure dri-
ves the voltage on the corresponding LED_ output
10
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相关代理商/技术参数
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制造商:MAXIM 功能描述:Pb Free
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功能描述:LED照明驱动器 Charge Pump for 6 White/RGB LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX8648ETE+T
功能描述:LED照明驱动器 Charge Pump for 6 White/RGB LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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制造商:Maxim Integrated Products 功能描述:MAX8648 EVAL KIT - Rail/Tube
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MAX8649BEWE+T
功能描述:直流/直流开关调节器 1.8A Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
MAX8649EVKIT+
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MAX8649EWE+
制造商:Maxim Integrated Products 功能描述:1.8A STEP-DOWN REGULATOR W/DIFFEREN - Rail/Tube