The need for consumers to reduce the size and cost of battery-powered handheld devices and to achieve ease of use by accepting multiple input power supplies presents system designers with many challenges. These challenges can be effectively addressed with the PowerPath Battery Manager family, which features independent, autonomous operation that enables efficient seamless switching between multiple power sources such as car adapters, FireWire inputs, AC adapters, USB ports, and the battery itself. management.
For system designers today in battery-powered handheld devices, some of the key challenges they face include minimizing power consumption, maximizing efficiency, simplifying design, and reducing costs.
Many of today's portable battery-powered electronic products receive power from AC adapters, car adapters, USB ports, or lithium-ion/polymer batteries. However, autonomous management of power path control between these different power supplies is extremely technically challenging. Designers have long tried to do this in a “discrete†way, using a large number of MOSFETs, operational amplifiers, and other discrete components, but with hot swaps and large influxes that could cause major system problems. Current and other problems. Recently, even discrete IC solutions require multiple chips to implement a practical solution, and an integrated power manager IC can easily solve these problems. In addition, the autonomous operation of the IC eliminates the need for an external microprocessor to implement the charge termination function, further simplifying the design.
When using an AC adapter such as FireWire, an unregulated high voltage (>5.5V) AC adapter and a car adapter, the voltage difference between the voltage source of the adapter and the battery in the handheld device is very large. Therefore, linear chargers may not be able to solve high power consumption problems, while ICs with switch mode topologies can improve efficiency and mitigate thermal management issues. It is worth noting that the linear charger/power manager is a more suitable choice when powered by USB, Li-Ion/Polymer batteries or an adapter with a lower than 5.5V input.
PowerPath control
Devices with PowerPath control can power their own USB VBUS or AC adapter power and charge their single-cell Li-Ion battery. To ensure that a fully charged battery is in an unused state when connected to the bus, the IC supplies power directly to the load through the USB bus instead of taking power from the battery. Once the power supply is removed, current flows from the battery to the load through an internal low-loss ideal diode, minimizing voltage drop and power dissipation.
Features of PowerPath Control:
1. Get power from a USB power source, an AC adapter, or a battery;
2. Deliver power to an application circuit connected to the OUT pin and a battery connected to the BAT pin (assuming an external power supply is connected instead of the battery);
3. The battery charging current will be adjusted to ensure that the sum of the charging current and the load current does not exceed the set USB input current limit;
4. The AC adapter current can be connected to the output (load side) via an external device (such as a power Schottky diode or FET);
5. A unique feature that allows the battery to be charged while the power is being supplied to the load using the output provided by the AC adapter;
6. The load on the OUT pin gives priority to the USB input current.
Ideal diode
A low-loss ideal diode will supply power from the battery when the output/load current exceeds the input current limit or the input supply is removed. Powering the load through an ideal diode (rather than connecting the load directly to the battery) allows a fully charged battery to remain fully charged before the external power supply is removed. Once the external power supply is removed, the output voltage drops until the ideal diode is applied with a forward bias. An ideal diode with forward bias is then supplied with output power from the battery to the load. The forward voltage drop of an ideal diode is much lower than that of a conventional diode, and its reverse leakage current is also smaller. A small forward voltage drop reduces power consumption and self-heating, extending battery life.
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Description
✿Service Life
Mechanical ≥ 1000000cycles
Electrical ≥ 50000cycles(Degree of protection againstDepend on model No.
✿Approvals
UL CUL VDE TUV CE DEMKO CQC
✿ Material
Made of high quality plastic and metal, rust resistance and corrosion resistance, durable enough for you to hanging items, So the product appearance is exquisite, perfect workmanship.
✿ Rating
You can meet the different RATING daily needs. Please pay attention to the model of the switch before purchase, to ensure that you purchase the same as you need.
✿ Vairous Sizes
Actuator Action is momentary and Actuator Type is long straight hinge lever. Switch Body Size as shown in the picture.So different sizes can meet all your daily different needs.
✿ Wide Application
Home appliance: micro oven, electric cooker, washing machine, electric heater, warmer, water fountain and so on.
Commercial appliance: Vending machine, electric toy, electric tools, duplicating machine and so on.
Machinery: Transport machinery, printing machinery, textile machinery and so on.
Basic Micro Switch,Micro Power Switch,Waterproof Micro Switch,Micro Switch Limit Switch
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