5V input boost architecture two series lithium battery charge management chip SGM41528

[Introduction]With the continuous improvement of the output power of Electronic products, the output power provided by a single battery can no longer meet the needs of these high-power products. Therefore, the power supply scheme of two, three or even more batteries in series can be widely used. , such as mobile POS machines, digital cameras, Bluetooth speakers, portable printers, drones, robots, power tools, etc., accompanied by the demand for charging solutions for these series battery packs. Among the switching charging schemes of various topologies, the high-voltage input buck scheme needs to be equipped with a dedicated adapter. The cost of the high-voltage input buck-boost scheme is too high. The low-voltage 5V input boost scheme is very suitable for charging two lithium batteries. .

The SGM41528 launched by Shengbang Microelectronics is such a chip that can provide 2A charging and path management for two series lithium batteries with 5V input. It can be used in electronic products such as POS machines with double-cell lithium batteries, Bluetooth speakers, etc. It can be adapted to almost any USB interface adapter. SGM41528 supports adapter-free product configuration, which saves costs for manufacturers and end users, and adds a touch of green to human environmental protection.

SGM41528 Typical Characteristics

● Input withstand voltage: 20V (maximum);

● Input working voltage: 3.9V to 6.2V;

● Charging current: 100mA to 2.2A, 50mA step;

● Full charge voltage: 6.8V to 9.2V, 10mV step;

● Charging efficiency: 92.5%@1A, VBAT = 7.6V;

● Maximum reverse Buck mode OTG current: 2A;

● OTG discharge efficiency: 94.5%@5V, 1A;

● Support Pulse Frequency Modulation (PFM) light-load high-efficiency mode;

● Light load Out-of-Audio mode is optional;

● Complete trickle precharge, constant current, constant voltage charging process;

● Configurable float timing function;

● BC1.2, automatically identify SDP, CDP, DCP and non-standard adapters;

● Dynamic power tracking of input voltage and input current;

● Adapter maximum power tracking function;

● Narrow voltage direct current charging (NVDC) power path management;

● BATFET on-resistance 13mΩ;

● 16-Bit ADC monitors each voltage, current, negative temperature coefficient (NTC), and junction temperature;

● Programmable JEITA;

● Flexible and easy-to-use I2C interface;

● High-precision full charge voltage;

● High precision constant current;

● Multiple safety protections such as overheating, overcurrent, overvoltage and short circuit;

● WLCSP-2.1×2.1-25B green package conforming to the concept of environmental protection.

SGM41528 Typical Application Circuit

5V input boost architecture two series lithium battery charge management chip SGM41528

SGM41528 package PIN definition

5V input boost architecture two series lithium battery charge management chip SGM41528

SGM41528 measured charging curve

5V input boost architecture two series lithium battery charge management chip SGM41528

SGM41528 charging efficiency curve

5V input boost architecture two series lithium battery charge management chip SGM41528

SGM41528 complies with JEITA safety guidelines

5V input boost architecture two series lithium battery charge management chip SGM41528

Schematic diagram of charging current adjustment

5V input boost architecture two series lithium battery charge management chip SGM41528Schematic diagram of charging voltage adjustment

SGM41528 integrates 16-Bit high precision ADC

● ADC conversion speed is adjustable;

● ADC effective resolution is adjustable;

● IBUS: 0A to 4A, 1mA step;

● ICHG: 0A to 4A, 1mA step;

● VBUS: 0V to 6.5V, 1mV step;

● VBAT: 0V to 10V, 1mV step;

● VSYS: 0V to 10V, 1mV step;

● VTS: 0% to 94.9% (of VREG), 0.098% step;

● VTDIE: 0°C to 128°C in 0.5°C steps.

Source: Shengbang Microelectronics

The Links:   SP14Q002-B1 TD251N18 INFIGBT