AN2390 datasheet(6/42 Pages) STMICROELECTRONICS

Part #	AN2390

Description	A flexible universal battery charger

PDF	42 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Theory of operation

AN2390

6/42

The battery temperature is also monitored. If the battery overheats, charging is suspended

until the battery cools down.

Once the battery is saturated, its voltage is still monitored to prevent the battery from

discharging completely. If the battery voltage drops below VSAT, charging restarts until VF is

reached again. Charge time is reset when trickle charging starts.

Table 1.

Li-ion charge parameters used in the evaluation board

Symbol

Meaning

Value

Unit

VMAX

Maximum charging voltage

4.3

Final battery voltage

4.2

VTRI

Trickle charge voltage

4.12

VFAST

Fast charge voltage

3.0

VSC

Battery failure voltage

1.5

IFAST

Fast charge current

1000

ISAT

Battery saturation current

IFAIL

Short circuit current

1200

tFAIL

Battery failure time

tEXP

Charge expire time

AN2390 Datasheet(PDF) 6 Page - STMicroelectronics