With the continuous improvement of the output power of electronic products, the output power that a single battery can provide can no longer meet the needs of these high-power products, so the power supply scheme of two, three or even more batteries in series has been widely used, such as mobile POS machines, digital cameras, Bluetooth speakers, portable printers, drones, robots, power tools, etc., accompanied by the demand for charging these series battery packs. In various topologies of switching charging schemes, the high-voltage input step-down scheme needs to be equipped with a special adapter, and the cost of the high-voltage input buck-boost scheme is too high, and the low-voltage 5V input step-up scheme is very suitable for charging two lithium batteries.
SGM41528 launched by Shengbang Microelectronics is such a 5V input chip that can provide 2A charging and path management for two series lithium batteries, with complete trickle precharge, constant current, constant voltage charging process and floating charge timing function, which can be used in POS machines with double lithium batteries, Bluetooth speakers and other electronic products, and 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 the cause of human environmental protection.
Input withstand voltage: 20V (max);
Input operating voltage: 39v to 62v；
Charging current: 100mA to 22a, 50mA stepping;
Full Charge Voltage: 68v to 92V, 10mV step;
Charging efficiency: 925%@1a，vbat = 7.6v；
Maximum reverse buck mode OTG current: 2A;
OTG discharge efficiency: 945%@5v，1a；
Supports Pulse Frequency Modulation (PFM) light-load high-efficiency mode
Light load out-of-audio mode optional;
Complete trickle pre-charge, constant current, constant voltage charging process;
Configurable float timer function;
bc1.2. Automatic identification of SDP, CDP, DCP and non-standard adapters;
Input voltage, input current, dynamic power tracking;
Adapter maximum power tracking function;
Narrow Voltage DC Charging (NVDC) Power Path Management;
BATFET on-impedance 13m;
The 16-bit ADC monitors voltage, current, negative temperature coefficient (NTC), junction temperature, and temperature
Programmable jeita;
Flexible and easy-to-use I2C interface
High-precision full charge voltage;
High-precision constant current current;
Multiple safety protections such as overheating, overcurrent, overvoltage, short circuit, etc
WLCSP-2 in line with the concept of environmental protection1×2.1-25B green package.
Schematic diagram of charging current adjustment.
Schematic diagram of charging voltage adjustment.
ADC conversion speed is adjustable;
ADC effective resolution adjustable;
IBUS: 0A to 4A, 1mA steps;
ICHG: 0A to 4A, 1 mA steps;
VBUS: 0V to 65V, 1mV step;
VBAT: 0V to 10V in 1mV steps;
VSYS: 0V to 10V in 1mV steps;
VTS: 0% to 949% (of vreg)，0.098% stepping;
vtdie: 0 to 128, 05 steps.
If you need data sheets, sample testing, procurement, BOM matching and other needs, **Customer Service WeChat: 13310830171.