IS32LT3126-ZLA3-TR ISSI

IS32LT3126 150MA DUAL CHANNEL LED DRIVER WITH FAULT DETECTION May 2018 GENERAL DESCRIPTION FEATURES The IS32LT3126 is a dual linear programmable current Dual channel: each channel can source up to regulator consisting of 2 independently controlled 150mA and the two channels combined to source output channels each channel is capable of sourcing up to 300mA 150mA. Both channels can be combined to provide a External resistors individually set source current total of 300mA. It supports PWM dimming of both 4% channel to channel current matching channels via power supply modulation (PSM). It also Individually programmable VCC under voltage features ENx pins to individually PWM dim and lockout to match the LED stack for PSM operation independently adjust the average output current for Individual PWM dimming each channel. The max current for each channel is set Shared fault flag for multiple devices operation with its corresponding external resistor. Fault protection with flag reporting: The UVx pins set the VCC under voltage lockout of - Single LED short (optional to turn off all LEDs) each channel to match the LED stack for high side - LED string open/short PWM dimming operation. In addition, the IC integrates - OUTx pins short to VCC/GND fault protection for LED open/short, ISETx pin open/short and over temperature condition for robust - ISETx pins open/short operation. Detection of these failures is reported by - Over temperature current rollback (no reporting) FAULTB pin. When a fault is detected the device will - Thermal shutdown disable itself and output an open drain low signal. External C capacitor keeps fault status during STOR Multiple devices can have their FAULTB pins start/stop operation connected to create a one-fail-all-fail condition. For eTSSOP-16 package multiple LED string applications, the device can detect Operating temperature range from -40C ~ +125C a single LED short. The single LED short detection is AEC-Q100 qualification set by a resistor divider on the STx pins. A single LED short failure is reported by the separate FAULTB S APPLICATIONS pin. Automotive interior/exterior lighting: The IS32LT3126 is targeted at the automotive market - Turn signal light with end applications to include interior and exterior lighting. For 12V automotive applications the low dropout driver can support one to several LEDs on the output channels. It is offered in a small thermally enhanced eTSSOP-16 package. TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 1 Rev. A, 05/08/2018 IS32LT3126 Figure 2 Typical Application Circuit (Several Devices In Parallel with FAULTB Interlinkage) Note 1: For PSM dimming application, high C capacitor value will affect the dimming accuracy. To get better dimming performance, VCC recommend 0.1F for it. Lumissil Microsystems www.lumissil.com 2 Rev. A, 05/08/2018