With the development of lithium battery technology, the market demand for low-cost and high energy storage portable energy storage devices is increasing, and many companies are developing such products. This article will introduce several common ADI portable energy storage power supply DC-DC charging and discharging solutions to meet the needs of the portable energy storage market and lithium-ion battery charging and discharging application scenarios. The solutions mentioned in the article are all market validated and mass-produced.


1.LT8390-60V four tube lifting and lowering solution



LT8390 is a synchronous 4-switch buck boost DC/DC controller that can adjust output voltage, input or output current based on input voltage higher, lower, or equal to the output voltage. The proprietary peak buck/peak boost current mode control scheme supports adjustable and synchronous fixed frequency operation from 150kHz to 650kHz, or supports internal ± 15% delta spread spectrum modulation that can reduce EMI. The LT8390 has an input voltage range of 4V to 60V and an output voltage capability of 0V to 60V, and supports seamless low-noise conversion between operating areas. It is an ideal choice for voltage regulators, batteries, and supercapacitor chargers in automotive, industrial, telecommunications, and battery power supply systems.

LT8390 provides input or output current monitoring and good power indication. It also provides a fault protection function to detect output short circuits, during which the LT8390 will be in a retry, latch, or keep running state.

In the field of portable energy storage products, the LT8390 can easily achieve high-power DC-DC lithium battery chargers, DC-DC voltage converters, and a safe working voltage of up to 55V. The LT8390 provides an optional input or output current monitoring pin, which, combined with the MPPT algorithm, can easily achieve solar charging function.

Advantages and characteristics:

●Ultimate withstand voltage 60V
●Four tube lifting and lowering pressure, with a maximum efficiency exceeding 98%
●Capable of constant current output
●The output current can be adjusted using analog signals, and combined with the MPPT algorithm, the solar charging function can be achieved

Application scenario:

●DC-DC charger
●Solar Charger
●Lithium battery output regulator board


2. LTC4020-55V, step-down boost type multi chemical composition battery charger



LTC4020 is a high-voltage power manager that allows for the implementation of Power Path over a wide voltage range ™ Instant connection operation and efficient battery charging. A built-in buck boost DC/DC controller can operate when the battery or system voltage is above, below, or equal to the input voltage.

LTC4020 can seamlessly manage power distribution between battery and converter outputs in response to load changes, battery charging requirements, and input power constraints.

The LTC4020 battery charger can provide a constant current/constant voltage charging algorithm (CC/CV), constant current charging (CC), or use an optimized 4-step, 3-stage lead-acid battery charging mode for charging. The maximum converter and battery charging current can be set by resistors.

Even when using a fully discharged battery, the instant on operation of the IC can ensure the power supply of the system load. Other safety features include pre inspection of severely discharged batteries and an integrated timer for providing charging termination and protection functions.

In portable energy storage and battery charging applications, LTC4020 can conveniently achieve battery charger and solar charger functions. LTC4020 directly supports the simulation of MPPT function, which can achieve high solar energy utilization without software control. LTC4020 points out output current monitoring and provides an output current monitoring pin. Combined with MPPT algorithm, high-performance MPPT solutions can be easily implemented. LTC4020 supports charging logic for lithium batteries, lead-acid batteries, and nickel hydrogen batteries.

Advantages and characteristics:

●Ultimate withstand voltage 60V
●Four tube lifting and lowering pressure, with a maximum efficiency exceeding 98%
●Equipped with optional charging control logic for lithium batteries, lead-acid batteries, and nickel hydrogen batteries
●Equipped with two sets of outputs, one connected to the backup battery and the other connected to the load. The chip has a Power path function, which can ensure that the output load does not power off
●The chip has FBIN pins, which can achieve analog circuit MPPT function and support solar charging function
●The chip provides temperature monitoring pins, which can monitor battery temperature and make corresponding control actions

Application scenario:

●DC-DC multiple chemical battery chargers
●DC-DC UPS system
●Solar Charger


3.LT8491- High voltage step-down boost battery charging controller with maximum power point tracking (MPPT) and I2C




LT8491 is a step-down step-up switch regulator battery charger, which can achieve a constant current and constant voltage (CCCV) charging curve for most battery types, including sealed lead-acid (SLA), overflow, gel and lithium-ion batteries.

The device operates at an input voltage higher than, lower than, or equal to the output voltage, and can be powered by a solar panel or a DC power source. On chip logic provides automatic maximum power point tracking (MPPT) for solar powered applications. LT8491 can perform automatic temperature compensation by detecting external thermistors that are thermally coupled to the battery. The STATUS pin can be used to drive LED indicator lights. The device adopts a thin (0.75mm) 7mm x 11mm 64 pin QFN package.

In portable energy storage power applications, the LT8491 scheme can quickly achieve high-performance, high-power solar charging circuits. LT8491 comes with an efficient MPPT algorithm and does not require professional software development. LT8491 comes with an IIC communication interface, which allows for easy reading and setting of voltage and current parameters through software. If IIC read and write function is not required, LT8490 scheme can be directly selected. LT8491 is an enhanced version of LT8490, which adds an IIC communication interface and supports IIC reading, setting voltage and current information.

Advantages and characteristics:

●Ultimate withstand voltage 80V
●Four tube lifting and lowering pressure, with a maximum efficiency exceeding 98%
●Equipped with optional charging control logic for lithium batteries, lead-acid batteries, and nickel hydrogen batteries
●Equipped with efficient solar charging MPPT algorithm, it can quickly build a high-power and efficient solar charging system
●Can be compatible with both 80V withstand voltage and conventional four tube voltage rise and fall circuits

Application scenario:

●DC-DC multiple chemical battery chargers
●High power solar charger with high-efficiency MPPT


4. LT3763-60V High Current Step-down Multifunctional Synchronous Rectification Buck Controller



LT ® 3763 is a fixed frequency, synchronous step-down DC/DC controller designed specifically for accurately adjusting output currents up to 20A. The average current mode controller will maintain the inductor current regulation function within a wide output voltage range of 0V to 55V. The output current is set by the analog voltage on the CTRL pin and an external detection resistor. Voltage regulation and overvoltage protection are set using a voltage divider connected between the output and FB pins. The switching frequency can be set within the range of 200kHz to 1MHz through an external resistor on the RT pin or using the SYNC pin and an external clock signal. Input and output current detection can provide input current limitation and accurate measurement of these currents. The FBIN pin is available for applications that require peak power tracking functionality.

Other features of this device include an accurate external reference voltage used in conjunction with the CTRL pin, an accurate UVLO/EN pin that provides programmable UVLO hysteresis, a PWM driver for LED applications, output voltage fault detection, and hot shutdown functionality.

In portable energy storage and lithium battery charging applications, LT3763 can easily build a step-down lithium battery charger, simulate an MPPT solar charger, and cooperate with the MPPT algorithm to achieve high-performance step-down MPPT solar charger and DC-DC step-down converter.

Advantages and characteristics:

●Ultimate withstand voltage 60V
●Synchronous rectification Buck circuit, capable of supporting an output current of 20A
●Supports constant current output and can be configured as a lithium battery charger
●Supports complete high-power LED Driver function, supports two linear dimming and one high-precision PWM dimming
●Equipped with FBIN pins, it can achieve analog MPPT function and can be used as a step-down solar charging controller
●Can be used as a conventional high-power Buck buck circuit

Application scenario:

●High power LED Driver
●High power Buck circuit
●Simulated MPPT step-down solar charger

summary

Kinri Energy has been deeply involved in the promotion and support of ADI power for many years, with a profound technical background and market experience. The solutions mentioned above are all based on the needs of portable energy storage and lithium battery charging and discharging application scenarios, and can be mass-produced in cooperation with customers for verification.