
TE
CH
tm
VD3/Excess Current Detector, Short Circuit 
Protector
   Both of the excess current detector and short 
circuit protector can work when both control 
FETs are in “ON” state.  When the V- pin 
voltage is going up to a value between the short 
protection voltage Vshort/VDD and excess 
current threshold VDET3, the excess current 
detector operates and further soaring of V- pin 
voltage higher than Vshort makes the short 
circuit protector enabled. This leads the external 
discharge control Nch MOSFET turn off with 
the Dout pin being at “L” level. 
    An output delay time for the excess current 
detector is internally fixed, 11ms typ. At 
VDD=3.0V. Aquick recovery of V- pin level 
from a value between Vshort and VDET3 within 
the delay time keeps the discharge control FET 
staying “H” state. 
     When the short circuit protector is enabled, 
the Dout would be low and its delay time would 
be 5us typ.  
    The V- pin has a built-in pulled down resistor, 
typ. 130kOhm with connecting to the Vss pin. 
After an excess current or short circuit 
protection is detected, removing a cause of 
excess current or external short circuit makes an 
external discharge control FET to an “ON” state 
automatically with the V- pin level being down 
to the Vss level through pulled down resistor 
built-in internally. 
    If VDD voltage would be higher than VDET2 
at a time when the excess current is detected the 
T63H0006B does not enter a standby mode, or 
otherwise in case of lower VDD voltage than 
VDET2 would lead the T63H0006B into a 
standby. 
    After detecting short circuit the T63H0006B 
will not enter a standby mode. 
                                                                      T63H0006B
TM Technology Inc. reserves the right
P. 5                                    
Publication Date: JUN. 2004 
to change products or specifications without notice.                                                                         Revision:B
Application Circuits 
6
5
4
3
2
1
-
C1
0.1uF
C2
0.1uF
R2
1 k ohm
T63H0006B
R1
100 ohm
+
Application Hints 
    R1 and C1 will stabilize a supply voltage to 
the T63H0006B. A recommended R1 value is 
less than 100 Ohm. A larger value of R1 leads 
higher detection voltage, makes some errors, 
because of shoot through current flowed in the 
T63H0006B.
   R2 and C2 will stabilize a V- pin voltage. The 
resetting from over-discharge with connecting a 
charger possibly be disabled by larger value of 
R2. 
   Recommended value is less than 1kOhm. 
After over-charge detection even connecting 
battery pack to a system probably could not 
allow a system to draw load current by a larger 
R2xC2 time constant in the T63H0006B.
   Recommended C2 value is less than 1uF.
R1 and R2 may cause power consumption over 
rating of power dissipation of the T63H0006B 
and a total of “R1+R2” should be more than 
1kOhm.
The time constants R1xC1 or R2xC2 must 
have a relation as below: 
R1xC1<=R2xC2 
    Because in case that R1xC1, time constant for 
VDD pin, would be larger than R2xC2, time 
constant for V- pin then the T63H0006B might 
be into a standby mode after detecting excess 
current or short circuit current.