Description

SLM6345 is a 2.5A lithium ion battery charger for 5V adapter. It is suitable for 4.45 V high energy lithium battery. It is a synchronous buck converter with a fixed frequency of 550kHz. It has a charging efficiency of more than 90% and a very small calorific value.

SLM6345 integrates 28V high-voltage devices, which can effectively prevent chip is damaged by surge voltage or incorrect connection of high-voltage adapter, and has high security.

The SLM6345 includes a complete charging termination circuit, automatic recharging and a 4.45V preset charging voltage with an accuracy of ±1%. The SLM6345 has many functions, such as anti back filling protection, output short circuit protection, chip and battery temperature protection.

SLM6345 is packaged in a miniaturized DFN3x3-10L package, which requires only a small number of peripheral components and a very small area of PCB board. Therefore, SLM6345 can be embedded in various handheld applications as an efficient charger for large capacity batteries.

Features

• ■The highest withstand voltage can reach 28V
• ■6.3V input overvoltage protection
• ■Fixed switching frequency of 550kHz
• ■High output efficiency of more than 90%
• ■Maximum adjustable output current of 2.5A
• ■Automatic identification of input current and adaptive adapter
• ■No need to prevent reverse current diode
• ■No external power MOS transistor or freewheeling diode is required
• ■Accuracy of 4.45V charging voltage with accuracy of ± 1%
• ■28V high voltage charging state dual indication output
• ■Shutdown current is only 20uA
• ■2.9V trickle charging
• ■Soft start limits surge current
• ■Battery temperature monitoring function
• ■Output short circuit protection function
• ■DFN3x3-10L package

Absolute Maximum Ratings

• ■Input power voltage(VIN): -0.3V~28V
• ■VGC: VIN-7V~VIN+0.3V
• ■NCHRG, NSTDBY: -0.3V~28V
• ■BAT: -0.3V~14V
• ■VS: -0.3V~14V
• ■LX: -0.3V~14V
• ■Others: -0.3V~7V
• ■BAT Short-Circuit Duration: Continuous
• ■Maximum Junction Temperature: 145℃
• ■Operating Temperature Range: -40℃ ~85℃
• ■Storage Temperature Range: -65℃~125℃
• ■Lead Temperature (Soldering, 10 sec) 260℃

Typical Application

Datasheet

SLM6345.pdf