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LT3498
APPLICATIONS INFORMATION — OLED DRIVER
a soft transition occurs between the CTRL2 pin and the
internal reference. Figure 10 shows this behavior.
1.500
1.250
1.000
0.750
0.500
Choosing a Feedback Node
The single feedback resistor may be connected to the V OUT2
pin or to the CAP2 pin (see Figure 11). Regulating the
V OUT2 pin eliminates the output offset resulting from the
voltage drop across the output disconnect PMOS. Regu-
lating the CAP2 pin does not compensate for the voltage
drop across the output disconnect, resulting in an output
voltage V OUT2 that is slightly lower than the voltage set by
the resistor divider. Under most conditions, it is advised
that the feedback resistor be tied to the V OUT2 pin.
0.250
Connecting the Load to the CAP2 Node
0
0
0.3
0.5 0.8 1.0
CTRL2 VOLTAGE (V)
1.3
1.5
3498 F10
The ef?ciency of the converter can be improved by con-
necting the load to the CAP2 pin instead of the V OUT2 pin.
Figure 10. CTRL2 to FB2 Transfer Curve
To set the maximum output voltage, select the values of
R FB2 according to the following equation:
The power loss in the PMOS disconnect circuit is then
made negligible. By connecting the feedback resistor to
the V OUT2 pin, no quiescent current will be consumed
in the feedback resistor string during shutdown since
the PMOS transistor will be open (see Figure 12). The
R FB2 = 182 ?
V OUT2
1.215
–1 ,k
disadvantage of this method is that the CAP2 node can-
not go to ground during shutdown, but will be limited to
When CTRL2 is used to override the internal reference,
the output voltage can be lowered from the maximum
value down to nearly the input voltage level. If the volt-
age source driving the CTRL2 pin is located at a distance
to the LT3498, a small 0.1μF capacitor may be needed to
bypass the pin locally.
around a diode drop below V IN . Loads connected to the
part should only sink current. Never force external power
supplies onto the CAP2 or V OUT2 pins. The larger value
output capacitor should be placed on the node to which
the load is connected.
CAP1
SW1
V IN
SW2
CAP2
V OUT2
C2
CAP1
SW1
V IN
SW2
CAP2
V OUT2
C3
I LOAD
LT3498
R FB2
LT3498
R FB2
LED1
CTRL1
GND1
GND2
CTRL2
FB2
LED1
CTRL1
GND1
GND2
CTRL2
FB2
3498 F12
C2
Figure 12. Improved Ef?ciency
CAP1
SW1
V IN
SW2
CAP2
V OUT2
C3
LT3498
R FB2
LED1
CTRL1
GND1
GND2
CTRL2
FB2
3498 F11
Figure 11. Feedback Connection Using
the CAP2 Pin or the V OUT2 Pin
3498fa
15
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