MILPITAS, Calif., April 11, 2022 -- Lumissil Microsystems, a division of Integrated Silicon Solution, Inc.(ISSI), announced today IS32LT3146 and IS32LT3147 LED drivers to further expand its portfolio ofautomotive lighting solutions. Both drivers are AEC-Q100 qualified, have wide input voltage range(5V~40V) to tolerate automobile battery voltage supply range and spikes, low headroom voltage andprovide 6-channels of adjustable constant current sources along with features to ensure practical andeasy integration into Automotive Lighting products. Thermal shunt circuitry to minimize driver thermalstress, comprehensive fault detection and reporting for added system reliability, current slew ratecontrol to optimize EMI and thermal roll-off to ensure device lifespan reliability.

The IS32LT3146 provides additional logic to turn on output channels in groups of 1, 2, 3 or 6 in onegroup-after-another-group sequential mode or all-channels blinking on/off mode. The grouping ofmultiple output channels enables adaptation for LEDs with higher current demands. The IS32LT3146was designed for standalone operation where a vehicle’s BCM (Body Control Module) signal powersthe device and all functions can be configured via external resistors without the need for amicrocontroller host. Multiple IS32LT3146 instances can be synchronized with or without signalingconnections; permitting device instances to be far apart or cross physical barriers such as ‘A and Bturn-lights’ where portion of the lighting fixture is on two sections of a vehicle; for example, the trunkdoor and also on the vehicle’s body.

The IS32LT3147 output channels have individual PWM dimming via dedicated PWM input control pins.An off-the-shelf microcontroller host’s GPIOs can be used to control PWM inputs. Alternatively,Lumissil’s IS32LT3134 animation controller could be used with up to 2 IS32LT3147 instances tomodulate up to 12 output current sources for complex pattern playback. If PWM dimming is notrequired, then IS32LT3147 PWM input control pins could be pulled high to enable for max currentoutput or pulled low to disable the channel while BCM signal powers the device on or off.

“The IS32LT3146 and IS32LT3147 are our latest automotive-grade, AEC-Q100 qualified LED driversdesigned to meet the demands of next generation dynamic vehicle lighting designs.” Said Ven Shan,Vice President of Marketing. “These drivers incorporate a rich set of integrated features for increasedsystem capability and reliability that enable Auto manufacturers to enhance their design, styling andimprove safety to make lighting designs a major differentiator in new Auto’s.”

The driver’s 6-channels current sources are each adjustable from 10mA to 75mA. Channels can beconnected in parallel for increased current drive capacity up to a maximum of 450mA per device. Thedevices have a low headroom voltage and low quiescent current for low power consumption. Bothdrivers operate over temperature range of -40°C to 150°C and come in thermally enhanced 6.5x4.4mmeTSSOP-20 package.

Availability and pricing

The IS32LT3146 is priced at $0.99 each in 1K pcs quantities.

The IS32LT3147 is priced at $0.99 each in 1K pcs quantities.