The IS32LT3124 is a linear programmable current
regulator consisting of 4 output channels capable of up
to 150mA each. Individual external resistors set the
maximum current level for each channel. The outputs
can be combined to provide a higher current drive
capability up to 600mA (Max.).
The IS32LT3124 features Dynamic Headroom Control
(DHC) with an optional external PMOS FET to
minimize IC thermal stress when the supply voltage
exceeds the LED string forward voltage. It includes two
modes for different output power: Shunt Regulator
mode and Series Regulator mode. It can operate with
power supply modulation (PSM)
requiring dimming without use of the EN pin.
For added system
integrates fault detection circuitry for open/short circuit
and over temperature conditions. The fault pins (FLTB)
can all be tied together to disable the device and other
IS32LT3124 devices on the same parallel circuit.
To handle all these different fault detection and
reporting features, the IS32LT3124 has six different
versions: A, B, C, D, E and F. All of them can support
the above features. See table 1 for the major
condition occurs, all output currents will be disabled. In
IS32LT3124B/C/E/F, individual ISET pin for each LED
channel is redefined as individual PWM dimming
control, thus ISET open detection function is removed.
The EN pin of IS32LT3124B/C/E/F is featured as the
enable signal of the internal fault reporting block. See
Table 4 for complete fault listing.
The IS32LT3124 is targeted at the automotive market
such as interior accent lighting and exterior tail lighting.
It is offered in a thermally enhanced eTSSOP-16
, Automotive LED driver
, RGBW automotive ambient lighting
, Tail light
, Turn light
, Daytime running light.