BQ24160 Datasheet, PDF (19/44 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switchmode Li-Ion Battery Charger with Power Path

bq24160, bq24161
bq24163, bq24168
www.ti.com
SLUSAO0A – NOVEMBER 2011 – REVISED MARCH 2012
Battery Discharge FET (BGATE)
The bq2416x contains a MOSFET driver to drive the gate of an external discharge FET between the battery and
the system output. This external FET provides a low impedance path when supplying the system from the
battery. Connect BGATE to the gate of the external discharge MOSFET. BGATE is on under the following
conditions:
1. No input supply connected.
2. HZ_MODE = 1
3. CD pin connected high
DEFAULT Mode
DEFAULT mode is used when I²C communication is not available. DEFAULT mode is entered in the following
situations:
1. When the charger is enabled and V_BAT< V_BATGD before I²C communication is established
2. When the watchdog timer expires without a reset from the I²C interface and the safety timer has not expired.
3. When the device comes out of any fault condition (sleep mode, OVP, faulty adapter mode, etc.) before I²C
communication is established
In DEFAULT mode, the I²C registers are reset to the default values. The 27-minute safety timer (no timer for
bq24168) is reset and starts when DEFAULT mode is entered. The default value for VBATREG is 3.6V, and the
default value for I_CHARGE is 1A. The input current limit for the IN input is set to 1.5A. The input current limit for the
USB input is determined by the D+/D– detection (bq24160/3) or PSEL (bq24161/8). PSEL and D+/D– detection
have no effect on the IN input. Default mode is exited by programming the I²C interface. Once I²C
communication is established, PSEL has no effect on the USB input. Note that if termination is enabled and
charging has terminated, a new charge cycle is NOT initiated when entering DEFAULT mode.
Copyright © 2011–2012, Texas Instruments Incorporated
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Product Folder Link(s): bq24160 bq24161 bq24163 bq24168