AAT3680 has 8-pin MSOP, TSSOP or SOP package; charging voltage VCH is suitable for different lithium batteries, one or two lithium batteries, factory presets are 4.1V, 4.2V, 8.2V, 8.4V; suitable for - 20 to +70 ° C temperature range.
AAT3680 internal architecture AAT3680 is a highly integrated, intelligent system-on-a-chip (SOC), which can be seen in Figure 1 by a read-enabled microcontroller, 2x trickle charge controller
AAT3680 application example
The practical application of the AAT3680 is very convenient and simple, with few peripheral devices. A typical application is shown in Figure 4.
The sensing resistor RSENSE monitors the charging current by using the voltage drop generated when the charging current flows during the charging state, thereby obtaining the feedback of the charging current, which can be calculated by the following formula:
RSENSE =VSENSE / IREG
IREG is the expected charging current.
The monitoring current of RSENSE is directly input to the monitoring current input (CSI) of the AAT3680.
Table 2 shows five different charging conditions
Charging status
Output status
LED display
Sleep/full off/off/off/offâ—â—â—â—
Temperature fault on/on/off/offâ—‹â—‹â—â—
Charging adjustment on/on/on/onâ—‹â—‹â—‹â—‹
Constant current mode on/on/on/offâ—‹â—‹â—‹â—
Constant voltage mode on/off/off/offâ—‹â—â—â—
(End of the text)
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