BQ24075T Datasheet, PDF (7/29 Pages) Texas Instruments – 1.5A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC

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NAME
NO.
SYSOFF
15
ISET
16
Thermal
--
Pad
bq24075T
bq24079T
SLUS937 – DECEMBER 2009
TERMINAL FUNCTIONS (continued)
I/O
DESCRIPTION
I System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system
output. When an adapter is connected, charge is also disabled. Connect SYSOFF low for normal
operation. SYSOFF is internally pulled up to VBAT through a large resistor (~5MΩ). Do not leave SYSOFF
unconnected to ensure proper operation.
I/O Fast Charge Current Programming Input. Connect a 590 Ω to 3 kΩ resistor from ISET to VSS to program
the fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage
ISET reflects the actual charging current and can be used to monitor charge current. See the Charge
Current Translator section of this datasheet for more details.
– There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device.
The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do
not use the thermal pad as the primary ground input for the device. VSS must be connected to ground at
all times.
Table 1. EN1/EN2 Settings
EN2
EN1
MAXIMUM INPUT CURRENT INTO IN
0
0 100 mA. USB100 mode
0
1 500 mA. USB500 mode
1
0 Set by external resistor from ILIM to VSS
1
1 Standby (USB suspend mode)
Copyright © 2009, Texas Instruments Incorporated
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