fs356a Fortune Semiconductor Corporation, fs356a Datasheet - Page 10

• Manufacturer Part Number: fs356a
• Description: One Cell Lithium-ion/polymer Battery Protection Ic
• Manufacturer: Fortune Semiconductor Corporation

FS356
Excess Charge Current Condition
When a charger is connected to the battery in normal condition, if VDD<Vdet1 and VCSI<Vdet4 occurs for a
delay time longer than tVdet4, then M2 will be turned off and charging stop. This condition is called the excess
charge current condition
Excess charge current condition is released when the voltage of CSI pin becomes higher than excess charge
current detection voltage(Vdet4), or the charger is removed.
Over Current / Short Circuit Condition
When the discharging current is too large during discharging under normal condition and the voltage detected
from CSI is larger than Vdet3 (or Vshort) for over a certain delay time tVdet3 (or Tshort), it means the over
current/short circuit condition occurred. M1 is turned off. CSI is pulled to VSS by way of an internal resistance,
RCSIS. This condition is called the over current (short circuit) condition.
Release of Over Current / Short Circuit Condition
While the protection IC remains in Over current/Short circuit condition and load is removed or the impedance
between VBAT+ and VBAT- is larger than 30KΩ and VCSI<Vdet3, M1 is to be turned on and back to normal
condition.
DS Pin
By forcing VDD voltage to DS pin, the delay time of overcharge and overdischarge can be reduced to within
50ms, therefore, testing time of protector circuit board can be reduced.
1.6MΩ pull down resistor is connected between DS pin and VSS internally.
DS pin should be open, or connected to VSS in the actual application.
Rev. 1.2
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