3. TECHNICAL BRIEF
LG Electronics 30/115 LGE Property
3.3.2 Charging
The bq25040 has a single power output that charges the battery. A system load can be placed in parallel with
the battery.The charge current is programmed using the ISET and EN/SET inputs. The charge current is
programmable to USB100, USB500 or a user programmed charge current up to 1.2A. Additionally, a 4.9V
+/-3% 50mA LDO is integrated into the IC for supplying low power external circuitry. The one-wire interface
(EN/SET) is available to place the bq25040 into Test Jig Mode. In Test Jig Mode, the output is regulated at
4.2V and can be used without a battery.The bq25040 has a single power output that charges the battery..
Either a 1-cell Li-Ion or Li-Ion-Polymer battery with 4.1, 4.2 or 4.4 Volts may be used.
4.2V~3.76V 3.75V~3.68V 3.67V~3.62V 3.61V~3.35V
Figure 5 Battery Block Indication
1. Charging method : CC-CV
2. Charger detect voltage : 4.8 V
3. Charging time : 2h 40m
4. Charging current : 650 mA
5. CV voltage : 4.2 V
6. Cutoff current : 110 mA
7. Full charge indication current (icon stop current) : 110 mA
8. Recharge voltage : 4.16 V
9. Low battery alarm
a. Stand by : 3.61V˨ ±0.05V
b. Call : 3.61V˨ ±0.05V
10. Low battery alarm interval
a. Stand by : 3 min
b. Dedicated : 1 min
11. Switch-off voltage : 3.35 V
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