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LT3498
APPLICATIONS INFORMATION — OLED DRIVER
Maximum Output Load Current
Step 4: Calculate the nominal output current:
The maximum output current of a particular LT3498
circuit is a function of several circuit variables. The fol-
lowing method can be helpful in predicting the maximum
I OUT ( NOM ) =
I IN ( AVG ) ? V IN ? 0 . 75
V OUT 2
amps
V IN ? 400 ? 10 – 9
I PK = I LIMIT +
load current for a given circuit:
Step 1: Calculate the peak inductor current:
amps
L
where I LIMIT is 0.3A for the OLED driver. L is the induc-
tance value in Henrys and V IN is the input voltage to the
boost circuit.
Step 2: Calculate the inductor ripple current:
Step 5: Derate output current:
I OUT = I OUT(NOM) ? 0.7 amps
For low output voltages the output current capability will
be increased. When using output disconnect (load current
taken from V OUT2 ), these higher currents will cause the
drop in the PMOS switch to be higher resulting in reduced
output current capability than those predicted by the
preceding equations.
Inrush Current
I RIPPLE =
( V OUT 2 + 1 – V IN ) ? 150 ? 10
L
– 9
amps
When V IN is stepped from ground to the operating voltage
while the output capacitor is discharged, a higher level of
where V OUT2 is the desired output voltage.
If the inductor ripple current is less then the peak current,
then the circuit will only operate in discontinuous conduc-
tion mode. The inductor value should be increased so
that I RIPPLE < I PK . An application circuit can be designed
to operate only in discontinuous mode, but the output
current capability will be reduced.
Step 3: Calculate the average input current:
inrush current will ?ow through the inductor and integrated
Schottky diode into the output capacitor. Conditions that
increase inrush current include a larger more abrupt voltage
step at V IN , a larger output capacitor tied to the CAP2 pin,
and an inductor with a low saturation current. While the
internal diode is designed to handle such events, the inrush
current should not be allowed to exceed 1A. For circuits
that use output capacitor values within the recommended
range and have input voltages of less than 5V, inrush cur-
rent remains low, posing no hazard to the device. In cases
I IN ( AVG ) = I PK –
I RIPPLE
2
amps
where there are large steps at V IN (more than 5V) and/or
a large capacitor is used at the CAP2 pin, inrush current
should be measured to ensure safe operation.
3498fa
16
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