Is this charging solution with such a wide range of input voltage your ideal one?

Latest update time：2021-04-29

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Portable electronic devices, such as medical equipment, in-vehicle communications, outdoor survey instruments, etc., generally have built-in batteries, and devices with batteries often need to consider charging. If the power input terminal of the device can be compatible with a wide enough voltage, it can use various power sources to replenish power and power the device at the same time, which will greatly broaden the adaptability and application range of the device.

Common power adapter output voltages are 5V, 9V, 12V, 15V, 19V, 24V, etc. Car power supplies are generally divided into 12V and 24V.

Wouldn’t it be ideal if there was a charging management chip that could cover all of the above input voltage ranges and support solar panel power supply with MPPT function?

LTC4020 Charge Management Solution

Next, we will introduce the ADI LTC4020 charging management solution that can realize the above functions.

Features

Supports 4.5-55V wide voltage input.
Supports output voltage higher, lower, and equal to input voltage.
Support CC mode, CC/CV mode, and four-step three-stage lead-acid battery charging mode.
With MPPT function, it can support solar panel power supply.
Supports C/10 charging mode, and performs small current pre-charging on over-discharged batteries in the initial charging stage.
Supports charging timing function, and the charging cut-off time can be set by a simple external timing capacitor.
Supports PowerPath function. When the device input power is disconnected or the input power is insufficient, the system automatically connects the battery to power the load. When the device input power is normal, the system can charge the battery and supply power to the load at the same time. When the battery is completely out of power, the system can ensure that the load is powered and the battery is charged at the same time.
Supports battery temperature monitoring. If the system detects abnormal battery temperature, charging will be terminated.
Equipped with battery failure detection function.
It has two status indication pins, which indicate the system working status in binary coding form. Low level is valid and can support external LED indicator lights.

Application Scenario

Portable industrial and medical equipment
Solar power supply system
Car Equipment

plan

Compact four-tube buck-boost main conversion topology + Powerpath controller.
Working frequency range: 50-500K

Typical application circuit

In order to facilitate small and medium-sized customers to quickly use this solution, the technical staff of ADI agent Cytech developed a finished power module.

Compact buck-boost charger MCM4020 based on LTC4020

Size: 58*35*8mm
Working frequency: 325K
Prototype input and output parameters: Vin: 15-50V, Vout: 21-28V (output up to 55V, absolute limit withstand voltage 60V), battery float charge voltage: 26V, CC/CV Mode
Maximum output current: 8A, battery charging mode can be set by changing the resistor, output voltage and current can be customized according to customer needs
Cooling method: According to different application environments, different sizes of heat sinks can be selected, and self-cooling or air-cooling mode can be adopted.

Efficiency test

Ambient temperature: 25℃
Multimeter: FLUKE 17B+
Electronic load: KL293A
Note: The module efficiency test is divided into bare board test and heat sink test. All output currents are the maximum output currents allowed under the conditions. The judgment standard is that the maximum temperature rise of the device surface on the entire board is within the rated range of the device.

上述的MCM系列电源模块依托ADI的高性能电源控制方案，由 ADI代理商骏龙科技的设计研发团队完成开发。目前有标准型号，同时也支持定制开发，让客戶节约系统开发时间，降低电源系统风险，节约开发成本。

ADI experts talk about electric vehicles!

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