The SGM3140B is a current-regulated charge pump
ideal for powering high brightness LEDs for camera
flash applications. The charge pump can be set to
regulate two current levels for Flash and Torch modes.
The SGM3140B automatically switches modes
between step-up and step-down ensuring that LED
current does not depend on the forward voltage. It
switches at 2.2MHz, allowing the use of tiny
components. The supply voltage ranges from 2.7V to
5.5V and is ideally suited for all applications powered
by a single Li-ion battery cell or three to four NiCd,
NiMH, or Alkaline battery cells.
The SGM3140B also features a very low shutdown
current, an automatic soft-start mode to limit inrush
current, as well as over-current, over-voltage and
over-temperature thermal shutdown control.
A low current-sense reference voltage (47mV) allows
the use of small 0603 current sensing resistors. SGM3140BYD10G/TR资料下载
