BQ24702PW

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BQ24702PW Application Field and Working Principle

The BQ24702PW is an advanced, integrated power management solution for single cell lithium-ion (Li-Ion) and lithium-polymer (Li-Po) battery charging, from 0.5A to 2A and 3.2A added charging. Its low-column packaging and low current requirements make it a desirable choice for space-constrained, portable products.

Integrated into the BQ24702PW is a highly programmable switch-mode battery charger for single-cell Li-ion and Li-Po battery power applications. The device provides programmable full against overcharge protection profiles and vbus overvoltage protection with adjustable preconditioning charge current and LED indicators, and can be used in combination with an external power path controller, providing the most flexible options for portable applications.

Application Field of BQ24702PW

This integrated power management and battery charging solution is suitable for products where space is limited and is best used in portable applications and devices like smartphones, digital cameras, tablets, wearables, medical devices, laptop computers, and more.

Working Principle

The BQ24702PW is an integrated switch-mode battery charger for single cell Li-ion and Li-Po battery power applications. It provides programmable full against overcharge protection profiles and VBUS overvoltage protection with adjustable preconditioning charge current, and can be used in combination with an external power path controller for an unlimited range of features. The BQ24702PW is designed to work with an on-board power source, typically a USB, wall adapter or solar cell, or a combination of any of these. Its high-efficiency, integrated synchronous boost converter maximizes overall conversion efficiency by optimizing input current usage, while reducing power dissipation and BOM cost.

Charging Cycle

The charging cycle includes three main stages: precharge, constant current and constant voltage (CV). The first stage, precharge, is when the charger emits pulse current to detect battery voltage. This induces charge into the battery and preps it for the constant current stage. This is the longest stage and is where most of the charge capacity is transferred to the battery. The last stage is the CV stage, when the voltage is regulated to the pre-programmed settings. When the current drops to its set low level, the charge done LED indicator acknowledges that the battery has been fully charged.

BQ24702PW\'s Advantages

The BQ24702PW is a highly programmable and versatile device that offers several advantages over other battery chargers. It provides programmable input current usage, advanced protection features, and improved charging cycle accuracy, to protect both the battery and the device itself. The BQ24702PW is also highly efficient, with a synchronous boost converter that minimizes power dissipations and cost, while providing optimal charging times. In addition, it can also be used in combination with other components, such as power path controller, enabling greater control over charging. Lastly, the BQ24702PW features a low-column packaging and its compact size allows it to fit into tight spaces, such as mobile phones, tablets, and other portable devices.

The BQ24702PW is an excellent choice for a wide range of applications, from smartphones and tablets to medical devices. Its highly programmable and efficient design make it a great choice for space-constrained, portable products, while its fast charging capabilities help reduce power consumption and maximize battery life.

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