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BQ24314DSJR Datasheet(PDF) 11 Page - Texas Instruments

Part # BQ24314DSJR
Description  OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li CHARGER FRONT-END PROTECTION IC
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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BQ24314DSJR Datasheet(HTML) 11 Page - Texas Instruments

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OPERATION
Input Overvoltage Protection
Input Overcurrent Protection
Battery Overvoltage Protection
Thermal Protection
Enable Function
Fault Indication
bq24314
bq24316
SLUS763C – JULY 2007 – REVISED OCTOBER 2007
The device continuously monitors the input voltage, the input current, and the battery voltage as described in
detail in the following sections.
If the input voltage rises above VOVP, the internal FET Q1 is turned off, removing power from the circuit. As
shown in Figure 4 to Figure 7, the response is very rapid, with the FET turning off in less than a microsecond.
The FAULT pin is driven low. When the input voltage returns below VOVP – VHYS-OVP (but is still above VUVLO), the
FET Q1 is turned on again after a deglitch time of tON(OVP) to ensure that the input supply has stabilized. Figure 8
shows the recovery from input OVP.
The overcurrent threshold is programmed by a resistor RILIM connected from the ILIM pin to VSS. Figure 18
shows the OCP threshold as a function of RILIM, and may be approximated by the following equation:
IOCP = 25 ÷ RILIM (current in A, resistance in kΩ)
If the load current tries to exceed the IOCP threshold, the device limits the current for a blanking duration of
tBLANK(OCP). If the load current returns to less than IOCP before tBLANK(OCP) times out, the device continues to
operate. However, if the overcurrent situation persists for tBLANK(OCP), the FET Q1 is turned off for a duration of
tREC(OCP), and the FAULT pin is driven low. The FET is then turned on again after tREC(OCP) and the current is
monitored all over again. Each time an OCP fault occurs, an internal counter is incremented. If 15 OCP faults
occur in one charge cycle, the FET is turned off permanently. The counter is cleared either by removing and
re-applying input power, or by disabling and re-enabling the device with the CE pin. Figure 9 to Figure 11 show
what happens in an overcurrent fault.
To prevent the input voltage from spiking up due to the inductance of the input cable, Q1 is turned off slowly,
resulting in a “soft-stop”, as shown in Figure 11.
The battery overvoltage threshold BVOVP is internally set to 4.35V. If the battery voltage exceeds the BVOVP
threshold, the FET Q1 is turned off, and the FAULT pin is driven low. The FET is turned back on once the battery
voltage drops to BVOVP – VHYS-BOVP (see Figure 12 and Figure 13). Each time a battery overvoltage fault occurs,
an internal counter is incremented. If 15 such faults occur in one charge cycle, the FET is turned off permanently.
The counter is cleared either by removing and re-applying input power, or by disabling and re-enabling the
device with the CE pin. In the case of a battery overvoltage fault, Q1 is switched OFF gradually (see Figure 12).
If the junction temperature of the device exceeds TJ(OFF), the FET Q1 is turned off, and the FAULT pin is driven
low. The FET is turned back on when the junction temperature falls below TJ(OFF) – TJ(OFF-HYS).
The IC has an enable pin which can be used to enable or disable the device. When the CE pin is driven high, the
internal FET is turned off. When the CE pin is low, the FET is turned on if other conditions are safe. The OCP
counter and the Bat-OVP counter are both reset when the device is disabled and re-enabled. The CE pin has an
internal pulldown resistor and can be left floating. Note that the FAULT pin functionality is also disabled when the
CE pin is high.
The FAULT pin is an active-low open-drain output. It is in a high-impedance state when operating conditions are
safe, or when the device is disabled by setting CE high. With CE low, the FAULT pin goes low whenever any of
these events occurs:
• Input overvoltage
• Input overcurrent
• Battery overvoltage
• IC Overtemperature
Copyright © 2007, Texas Instruments Incorporated
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