BQ24085_17 Datasheet, PDF (23/42 Pages) Texas Instruments – 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation

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bq24085, bq24086, bq24087, bq24088
SLUS784E – DECEMBER 2007 – REVISED DECEMBER 2015
Device Functional Modes (continued)
8.4.6 Charging Mode
When the charging mode is active, the bq24085/6/7/8 executes the charging algorithm, as described in the
Operational Flow Chart, Figure 17.
8.4.7 Suspend Mode
The suspend mode is entered when the pack temperature is not within the valid temperature range. During the
suspend mode, the charger is set to OFF, but the timers are not reset.
The normal charging mode resumes when the pack temperature returns to the valid temperature range.
8.4.8 LDO Mode Operation
The LDO Mode (TMR pin open circuit) disables the charging termination circuit, disables the battery detect
routine and holds the safety timer clock in reset. This is often used for operation without a battery or in
production testing. This mode is different than a typical LDO since it has different modes of operation, and
delivers less current at lower output voltages. See Figure 16 for the output current versus the output voltage.
NOTE
A load on the output prior to powering the device may keep the part in short-circuit mode.
Also, during normal operation, exceeding the programmed fast charge level causes the
output to drop, further restricting the output power, and soon ends up in short-circuit
mode.
Operation with a battery or keeping the average load current below the programmed current level prevents this
type of latch up. The OUT pin current can be monitored through the ISET pin. If the device is in LDO mode and
battery is absent, TI recommends to use a 350-Ω feedback resistor between the BAT and OUT pins.
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