The TPS6131x family is an integrated solution with a
wide feature set for driving up to three LEDs for
still-camera flash strobe and video-camera lighting
applications. It is based on a high efficiency
synchronous boost topology with combinable current
sinks to drive up to three white LEDs in parallel. The
2MHz switching frequency allows the use of small
and low-profile 2.2mH inductors. To optimize overall
efficiency, the device operates with a low
LED-feedback voltage and regulated output-voltage
adaptation.
The device integrates a control scheme that
automatically optimizes the LED current flash budget
as a function of the battery voltage condition.
The TPS6131x not only operates as a regulated
current source, but also as a standard voltage boost
regulator. The device enters power-save mode
operation at light load currents to maintain high
efficiency over the entire load current range. These
operating modes can be useful to supply other high
power devices in the system (e.g. hands-free audio
PA).