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V

-InputVoltage-V

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ThermalRegulation

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VBAT =3V

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bq25060

SLUSA32 – MAY 2010

www.ti.com

TYPICAL CHARACTERISTICS (continued)

INPUT CURRENT LIMIT

OUTPUT VOLTAGE

vs

vs

INPUT VOLTAGE

CHARGE CURRENT

Figure 15.

Figure 16.

DETAILED FUNCTIONAL DESCRIPTION

The bq25060 is a highly integrated Li-Ion linear battery charger targeted at space-limited portable applications. It

operates from either a USB port or AC Adapter and charges a single-cell Li-Ion battery with up to 1A of charge

current. The 30V input voltage range with input over-voltage protections supports low-cost unregulated adapters.

The bq25060 has a single power output that charges the battery. The system load is connected to OUT. The

connected. This allows the system to start-up and run whenever an input source is connected regardless of the

battery voltage. The charge current is programmable up to 1A using the EN input. Additionally, a 4.9V 50mA

LDO is integrated into the IC for supplying low power external circuitry.

External FET Controller (BGATE)

The External Power Path Control feature is implemented using the BGATE output. BGATE is also used to

bq25060, the BGATE output is tested. If the BGATE pin is connected to VSS, the External Power Path Control

feature is disabled. In order to enable the External Power Path Control feature after it has been disabled, the

battery and the input source must be removed and reconnected and BGATE must NOT be connected to VSS.

With External Power Path Control enabled, BGATE is used to drive an external P-channel FET that connects the

battery to the system output. The state of this FET is dependant on the battery voltage and the IC status. In

discharge mode, BGATE is pulled to GND to turn the external FET on fully. During discharge mode, the output is

connected directly to the battery. Discharge mode is entered under the following conditions:

1. IC disabled or no input power

2. Supplement mode

When not in one of these conditions, the BGATE output is controlled by the bq25060 and changes depending on

which mode is required. See the Charging Operation section for more details.

10

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