Smartphones and tablets are now a necessity in everyday life, and consumer demand for smartphones is growing. OPPO mobile phone can charge for 2 hours in 5 minutes, this feature technology has attracted the attention of many consumers. It can be seen that battery life has become the most concerned issue for consumers. In order to meet the mobile phone power budget, provide longer battery runtime and improve the customer experience, a higher capacity battery is required. The increased battery capacity poses a huge challenge to the overall system architecture, resulting in longer charging times and slower charging rates. The output voltage of the original USB 2.0 charger is 5V, which is out of date for the current smartphone. Consumers hope to achieve faster and more efficient charging on high-capacity batteries and increase charging rates.
In the past two years, battery voltage technology has also improved, from the original 4.2V battery to the current 4.3V battery, and even this year, manufacturers have been doing 4.4V batteries, and the battery can increase battery life by 0.1V. The ability is increased by about 50%.
Figure 1 Evolution of smartphone battery capacity
Texas Instruments (TI) introduced the bq25892 switch mode charger, the industry's first fully integrated 5A single-cell Li-ion battery charge management device with proprietary MaxChargeTM technology for high input voltage and adjustable Voltage USB On-the-Go boost mode. Compared to existing battery chargers, the bq25892 with MaxChargeTM technology reduces charging time by more than half, and reduces charging time by up to 60%, allowing users to achieve fast charging without being overheated. The traditional charger is a small box on the wall to connect the mobile phone for charging. Unlike the traditional charger, the TI Charger IC (ChargeIC) is a chip placed on the motherboard of the mobile phone, which is necessary for each mobile phone. After the phone is connected to USB, the first chip encountered is ChargeIC.
The bq25892 switch mode charger provides users with a safer charging experience while maximizing the benefits of fast charging times. While enhancing the user experience, it extends the life of electronic components in many lithium-ion applications. MaxChargeTM technology reduces charging time and reduces the amount of heat generated during charging, and has a broad application market, including smartphones, tablets, drones, mobile power, and industrial and medical equipment.
By combining narrow-amplitude DC/DC power path management with TI's MaxChargeTM technology, the temperature rises to at least 18°C ​​at 3.5A, making it easy to achieve fast, low-calorie charging and charging. Supports input voltages up to 14V at currents up to 5A.
characteristicHigh efficiency 5A, 1.5MHz switch mode step-down charging
2A charging current with up to 93% charging efficiency; 3A charging current with charging efficiency up to 91%
Optimized for high voltage input (9V/12V)
Low-power PFM mode for light load operation
USB On-the-Go (OTG) with adjustable output voltage range from 4.5V to 5.5V
Optional 500KHz/1.5MHz boost converter with up to 2.4A output current
Boost efficiency at 5V/1A output is 93%
Precise intermittent mode overcurrent protection
Single input, support for USB input and adjustable high voltage adapter
Supports 3.9V to 14V input voltage range
Input current limit (100mA to 3.25A, resolution 50mA), support USB2.0, USB3.0 standard and high voltage adapter
Maximum power tracking with input voltage limit (up to 14V) for all types of adapters
Automatic detection of USB SDP, CDP, DCP and non-standard adapters (bq25890)
Input Current Optimizer (ICO) maximizes input power without an overload adapter
Resistance compensation between charger output and battery terminal (IRCOMP)
Highest battery discharge efficiency with discharge current up to 9A with 11mΩ battery discharge metal-oxide-semiconductor field-effect transistor (MOSFET)
Integrated analog-to-digital converter (ADC) for system monitoring
(voltage, temperature and charging current)
Narrow VDC (NVDC) power path management
Instantaneously connected when working with a batteryless or deep discharge battery
Ideal diode operation in battery management mode
BATFET control, support for transport mode, wake-up and full system reset
Flexible autonomous and I2C modes for optimal system performance
High integration, including all MOSFETs, current sensing and loop compensation
12μA low battery leakage current, support for transport mode
High precision
±0.5% charging voltage regulation
±5% charge current regulation
±7.5% input current regulation
Safety
Battery temperature sensing for charge mode and boost mode
Thermal regulation and thermal shutdown
applicationsmart phone
tablet
Portable network equipment
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Foshan Shunde Josintech Electrical Appliance Technology Co.,Ltd , https://www.josintech.com