BQ25060_1 Datasheet, PDF (11/24 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion Battery Charger with 50-mA LDO, and External Power Path Control

bq25060
www.ti.com
SLUSA32 – MAY 2010
Enable/ Disable External Power Path Control
When power is first applied to the bq25060, either at the IN or BAT input, the bq25060 checks the BGATE
output. The device sources a small current out of BGATE for 2ms and monitors the voltage. If VBGATE is
connected to ground and the voltage does not rise above logic High, the External Power Path Control feature is
disabled and VLOWV is set to 2.5V. If the BGATE voltage rises above logic High, the External Power Path
Control feature is enabled and V_LOWV is set to 2.9V. The bq25060 only does this check when power is initially
applied. Power must removed from IN and BAT and then reapplied to initiate another check. Figure 17 illustrates
the startup check procedure.
No Input Source or
Battery Connected
Input source OR
NO
Battery connected?
YES
Source Current to
BGATE
BGATE =
VSS?
NO
YES
External
Power Path
Control
Disabled
VLOWV = 2.5V
External
Power Path
Control
Enabled
VLOWV = 2.9V
Figure 17. BGATE Monitor Sequence
Charging Operation
The bq25060 charges a battery in 3 stages while maintaining a minimum system output. When the bq25060 is
enabled by EN, the battery voltage is monitored to verify which stage of charging must be used. The bq25060
charges in precharge mode, minimum output regulation mode, or normal CC/CV mode based on the battery
voltage.
Copyright © 2010, Texas Instruments Incorporated
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