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LTC3209-1/LTC3209-2
OPERATIO
I OUT =
Consider the example of driving white LEDs from a 3.1V
supply. If the LED forward voltage is 3.8V and the current
sources require 100mV, the advantage voltage for 1.5x
mode is 3.1V ? 1.5 – 3.8V – 0.1V or 750mV. Notice that if
the input voltage is raised to 3.2V, the advantage voltage
jumps to 900mV—a 20% improvement in available
strength.
From Figure 1, for 1.5x mode the available current is given
by:
1.5 V BAT – V CPO
R OL
For 2x mode, the available current is given by:
Notice that the advantage voltage in this case is
3.1V ? 2 – 3.8V – 0.1V = 2.3V. R OL is higher in 2x mode but
a significant overall increase in available current is achieved.
Typical values of R OL as a function of temperature are
shown in Figures 2 and 3.
Shutdown Current
Shutdown occurs when all the current source data bits
have been written to zero or when DV CC is below the DV CC
UVLO threshold.
Although the LTC3209-1/LTC3209-2 is designed to have
very low shutdown current, it will draw about 3 μ A from
V BAT when in shutdown. Internal logic ensures that the
I OUT =
2 V BAT – V CPO
R OL
LTC3209-1/LTC3209-2 is in shutdown when DV CC is
grounded. Note, however that all of the logic signals that
are referenced to DV CC (SCL, SDA, CAMHL) will need to be
at DV CC or below (i.e., ground) to avoid violation of the
absolute maximum specifications on these pins.
3.2
3.0
2.8
2.6
2.4
2.2
2.0
V BAT = 3V
V CPO = 4.2V
C2 = C3 = C4 = 2.2 μ F
3.8
3.6
3.4
3.2
3.0
2.8
2.6
V BAT = 3V
V CPO = 4.8V
C2 = C3 = C4 = 2.2 μ F
–40
–15
10 35
60
85
–40
–15
10 35
60
85
TEMPERATURE ( ° C)
3209 G06
Figure 2. Typical 1.5x R OL vs Temperature
TEMPERATURE ( ° C)
3209 G08
Figure 3. Typical 2x R OL vs Temperature
320912fa
10
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