SLM6800-5V input dual string lithium battery balancing charger

Chip solution Battery power management chip SLM6800 solution verification.

The default charging current of this module is 1A, so it needs to be powered by a charging head above 5V2A to charge at full power. With simple equalization circuit. For new batteries with little difference in system. Can be used if there is a slight imbalance. If it is seriously unbalanced, no matter how advanced the balance is, it will be troublesome. Charging and balancing 2-string or multi-string lithium batteries has always been a troublesome matter. There are those that can be charged directly with high voltage without balancing, and those that are connected in series with independent chargers. These are all troublesome methods. SLM6800 is a chip that can directly input 5V and boost the voltage to charge 2 strings of lithium batteries. Built-in mos can effectively reduce external components and costs.

Added HY2213 balancing chip. It can provide maximum voltage balance when charging 2 strings of lithium batteries (the batteries themselves need to be paired). SLM6800 is a two-cell lithium battery synchronous boost current circuit for 5V adapter. It uses a fully integrated power MOS device and a synchronous boost converter with a switching frequency of 750KHz, so it has a charging efficiency of over 92% and can support a maximum charging current of 1.5A.

The SLM6800 includes a complete charge termination circuit, automatic recharging and an 8.4V preset charging voltage with an accuracy of ±1%. It integrates anti-backfeed protection, output short-circuit protection, chip and battery temperature protection and other functions.

The SLM6800 can adapt to the current supply capability of the adapter to ensure that the input adapter will not be overloaded, so it is suitable for various DC devices and standard USB charging devices.

SLM6800 integrates a 20V power MOSFET. It can withstand voltages up to 20V, and integrates under-voltage and over-voltage protection functions. It has high reliability and does not require additional anti-surge or over-voltage protection devices.

SLM6800 adopts miniaturized QFN4x4-16L package to save PCB area.