The TPS6115x is a high-frequency boost converter with two regulated current outputs for
driving WLEDs. Each current output can be individually programmed through external resistors. There
is a dedicated selection pin for each output so the two outputs can be turned on separately or
simultaneously. The output current can be reduced by a pulse width modulation (PWM) signal on SEL
pins or an analog voltage on the ISET pins, resulting in PWM dimming of the WLEDs. The boost
regulator runs at a 1.2-MHz fixed switching frequency to reduce output ripple and avoid audible
noises associated with pulse frequency modulation (PFM) control.
The two current outputs are ideal for driving WLED backlights for the sub and main
displays in clamshell phones. The two outputs can also be used for driving display and keypad
backlights. When used together, the two outputs can drive up to 14 WLEDs for one large
In addition to the small inductor, small capacitor, and 3-mm × 3-mm VSON package, the
built-in MOSFET and diode eliminate the need for any external power devices. Overall, the device
provides an extremely compact solution with high efficiency and plenty of flexibility.
For all available packages, see the orderable addendum at the
end of the data sheet.
View datasheet View product folder