In consumer electronics products such as smartphones, tablets, and digital cameras, standby power consumption has always been a key design difficulty. In addition, these products require seamless power management and battery switching to provide better flexibility and battery reliability. Fairchild's IntelliMAX smart load switch can effectively reduce standby power consumption, realize functions such as inrush current prevention and overcurrent protection, and help designers reduce design complexity while achieving higher system efficiency and reliability.
It is reported that the IntelliMAX smart load switch product portfolio has features such as slew rate control against inrush current, overcurrent limit and thermal shutdown protection, reverse current blocking, and low operating input voltage. It can handle many configurations with multiple channels and High voltage and current load applications. The extended products of the IntelliMAX series use a single-chip solution to solve the dynamic power problem of light industrial applications, giving designers the ability to meet design needs through off-the-shelf products, reducing the number of components and increasing efficiency.
Figure 1: Li Wenhui, senior marketing manager of Fairchild Semiconductor.
The traditional load switch uses 2 to 3 MOS tubes plus resistance and capacitance to achieve. However, in current handheld devices such as smart phones, the battery capacity can no longer meet the application requirements, so the peripheral parts need to be optimized. Li Wenhui, senior marketing manager of Fairchild ’s mobile, computing, consumer and communications marketing and application engineering department, explained that there are many peripheral devices in addition to the main chip in smartphones, such as cameras, touchpads, Wi-Fi modules, GPS, Bluetooth module, etc., these functions are in standby for most of the time. An important advantage of IntelliMAX intelligent load switch is that it can reduce standby power consumption. He revealed, "After a well-known domestic smartphone uses the IntelliMAX smart load switch, the standby time has been increased from the previous day to 3 days."
In addition to reducing standby power consumption, the benefits of the integrated load switch include slew rate control, which can reduce the impact of inrush current (the camera and Wi-Fi load in mobile phones is large, and the inrush current when starting the device will affect The system is stable); over-current protection; realize system power-on sequencing. Different from the traditional load switch using CMOS process, IntelliMAX smart load switch is manufactured using Fairchild BiCMOS process, which can support a very low operating voltage, and the quiescent current is less than 1uA.
Figure 2: IntelliMAX intelligent load switches FPF1039 and FPF1048.
The FPF1039 and FPF1048 switches are suitable for smart devices and portable storage devices that require high current capability and low on-resistance solutions for power path management, providing 20m? And 23m? On-resistance, 1.2V ~ 5.5V and 1.5V ~ 5.5V input voltage range, and extremely low off current leakage, help to meet the requirements of low standby power consumption applications. The optimized slew rate controlled turn-on feature of TR = 2.7mS prevents voltage drops on power rails with large capacitors up to 200μF. FPF1048 also provides true reverse current block (True Reverse Current Block) function, regardless of whether the product is on or off, can avoid unwanted reverse power.
FPF2165R and FPF2195 full-featured load switches have adjustable current limit, which is very suitable for applications with physical connectors such as USB and HDMI, to deal with possible high current conditions. Using the current limiting function with external resistors, the input power budget control can be easily adjusted, providing reverse current blocking characteristics to prevent unnecessary reverse currents when the device is turned off. These devices work in constant current mode, which helps prevent current damage and maintain a limited current after a current limiting fault. Adopt 2 & TImes; 2mm2 MicroFET package.
Li Wenhui said that in the mobile market, Fairchild's strategy is to provide matching solutions or optimized IP through cooperation with mainstream Chipset platform suppliers, thereby reducing manufacturers' research and development time and costs, and speeding up product launches. In addition, Fairchild has a strong mobile IP to help differentiate products.
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