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CAT3661
range. Extra external resistors can be added to the top or
bottom of the internal resistor divider network to alter the
divider ratio gain factor. The low battery indicator trip point
can be calculated by the following formula:
V LB + V ADJ G ADJ
V LB = Low Battery Voltage Trip Point
V ADJ = Low Battery Comparator Trip point (0.6 V)
G ADJ = Resistor Divider Gain (4 internally)
To obtain a low battery trip point of 2.4 V, the ADJH pin
is shorted to VIN, and the ADJL pin is tied to GND.
To increase the low battery trip point, insert a resistor
between ADJH and VIN. To consequently lower the low
For V LB > 2.4 V, use R L = 0 W and
R H (k W ) ? 200 (V LB /0.6 – 1) ? 600
For V LB < 2.4 V, use R H = 0 W and
R L (k W ) ? 600 (0.6/(V LB – 0.6)) – 200
Figure 26 shows the external resistor value for low battery
voltage trip points (V LB ) between 2 V and 3.2 V. For V LB
above 2.4 V, R L = 0 W . For V LB below 2.4 V, R H = 0 W .
240
200
160
battery trip point, insert a resistor between ADJL and GND.
The following formula shows how to calculate the modified
resistor divider gain:
120
80
RH
G ADJM +
R ADJ ) R H
(R ADJ G ADJ ) ) R L
40
RL
G ADJM = Modified resistor divider gain
R ADJ = Total resistance of divider (800 k W typ.)
R H = High external resistor (ADJH to VIN)
R L = Low external resistor (ADHL to GND)
0
2.0
2.2 2.4 2.6 2.8
TRIP POINT VOLTAGE (V)
Figure 26. V LB vs. R H & R L
3.0
3.2
The low battery trip point does not operate for adjustments
below 2.0 V VIN.
The inclusion of the ADJH pin allows monitoring of
supplies other than the supply to the CAT3661. Simply
connect ADJH pin directly to the supply to be monitored and
the low battery indicator will function as normal when the
device is enabled. When EN is low, no current will flow in
the resistor divider network allowing ‘zero’ current
shutdown mode.
Under Voltage Lockout
Figure 25. Application Circuit with R H & R L
The resistance required for a certain trip point voltage can
be calculated by rearranging the above equations with
respect to R H or R L .
If the voltage on VIN is less than V UVLO threshold, the
nFLTB output is driven low and the device enters a low
power state where the LED output is off.
When the device is in shutdown (EN low), the nFLTB pin
will float high to ‘zero’ current state.
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