BQ24165 Datasheet, PDF (18/35 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switch Mode Li-Ion Battery Charger with Power Path

bq24165
bq24166
bq24167
SLUSAP4A – DECEMBER 2011 – REVISED MARCH 2012
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LDO OUTPUT (DRV)
The bq24165/6/7 contains a linear regulator (DRV) that is used to supply the internal MOSFET drivers and other
circuitry. Additionally, DRV supplies up to 10mA external loads to power the STAT LED or the USB transceiver
circuitry. The maximum value of the DRV output is 5.45V so it is ideal to protect voltage sensitive USB circuits.
The LDO is on whenever a supply is connected to the IN or USB inputs of the bq24165/166. The DRV is
disabled under the following conditions:
1. V_SUPPLY < UVLO
2. V_SUPPLY - V_BAT< V_SLP
3. Thermal Shutdown
CHARGE PARAMETER SELECTOR INPUTS (CE1, CE2, bq24165)
The CE1 and CE2 inputs allow the user to easily implement the JEITA standard for systems where the battery
pack temperature is monitored by the host. JEITA requires that several temperatures be monitored and the
maximum charge voltage or charge current be modified based on the battery voltage. A graphical representation
of the JEITA specification is shown in Figure 22.
Maximum Charge Current: 1 C
0.5 C
Maximum Charge Voltage: 4.25 V
(4.2 V Typical)
4.15 V Maximum
4.10 V Maximum
T1
(0°C)
T2
(10°C)
T3 T4
(45°C) (50°C)
T5
(60°C)
Figure 22. Charge Current During TS Conditions in Default Mode
In many systems, the battery temperature is monitored by the host and the information is used for several
different operations. For these systems, the bq24165 method is ideal because it does not require the NTC in the
battery to be shared amongst several different ICs. Instead, the CE1 and CE2 pins are driven by host GPIOs to
reduce the charging current or charge voltage as required. This allows the host to decide which temperatures to
change the charging profile and gives the ultimate flexibility to the user. Additionally, CE1 and CE2 are used to
disable charging while not interfering with the main buck converter operation. The configuration table for CE1 and
CE2 is shown in Table 2.
Table 2. CE1, CE2 Input Table
CE1
0
0
1
1
CE2
FUNCTION
0 Normal Charging
1 Charge current reduced by half
0 V_BAT(REG) reduced to 4.06 V
1 Charging Suspended
18
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