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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
0
1
2
3
4
5
26
27
28
29
30
31
EN _
INITIAL t HI
> 120 μ s
24mA
22.4
20.8
19.2
17.6
t LO
1 μ s TO 500 μ s
16.0
t HI
> 1 μ s
24mA 22.4
t SHDN
4ms
I LED_
0mA
0.6
0.5
0.4
0.3
0.2
0.1mA
0mA
Figure 3. EN_ Timing Diagram
Capacitor Selection
Ceramic capacitors are recommended due to their small
size, low cost, and low ESR. Select ceramic capacitors
that maintain their capacitance over temperature and
DC bias. Capacitors with X5R or X7R temperature char-
acteristics generally perform well. Recommended val-
ues are shown in the Typical Operating Circuit. Using a
larger value input capacitor helps to reduce input ripple
(see the Input Ripple section).
Driving LEDs with Multiple Supplies
It is not necessary for the LED anodes to connect to IN.
Figure 7 shows an example using separate supplies to
power the LED_ groups of the MAX8648. In this exam-
ple, the voltage source (V1) provides power for RGB
LEDs (LED1, LED2, and LED3). V2 provides power for
backlight LEDs (LED4 and LED5), and V3 provides
power for a red charge indicator (LED6).
PCB Layout and Routing
The MAX8647/MAX8648 have a high-frequency,
switched-capacitor voltage inverter. For best circuit per-
formance, use a solid copper plane and place C1–C4 as
close as possible to the MAX8647/MAX8648. Figure 4
shows the MAX8648 evaluation kit example layout.
Figure 4. MAX8648 Evaluation Kit Layout for C1–C4
Chip Information
PROCESS: BiCMOS
12
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相关代理商/技术参数
MAX8648ETE 制造商:MAXIM 功能描述:Pb Free
MAX8648ETE+ 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
MAX8648EVKIT+ 制造商:Maxim Integrated Products 功能描述:MAX8648 EVAL KIT - Rail/Tube
MAX8649AEWE+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
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+ 制造商:Maxim Integrated Products 功能描述:1.8A STEP-DOWN REGULATOR W/DIFFERENTIAL REMOTE SENSE IN 2MM - Boxed Product (Development Kits)
MAX8649EWE+ 制造商:Maxim Integrated Products 功能描述:1.8A STEP-DOWN REGULATOR W/DIFFEREN - Rail/Tube