A8502KLPTR-T

Overview

The A8502KLPTR-T is a multi-output white LED driver designed for small-size LCD backlighting in automotive environments. It integrates a current-mode boost converter with an internal power switch and two independent current sinks. The device operates from a single power supply ranging from 5 V to 40 V, accommodating start/stop, cold crank, and load dump conditions. Each channel provides a fixed LED current of 120 mA, supporting up to 12 series LEDs per string. The sinks can be paralleled to achieve higher currents up to 240 mA. It features synchronization capability up to 2.3 MHz and includes extensive protection mechanisms against short circuits, open LEDs, and overtemperature.

Feature Summary

• Integrates a high-voltage boost converter with dual independent current sinks for precise LED regulation
• Supports PWM dimming at 200 Hz with a ratio of 5000:1 and analog dimming inputs
• Includes comprehensive fault protection against output shorts, open LEDs, and thermal overload
• Features synchronization function to allow operation above the AM broadcast band

Applications

• Automotive infotainment system LCD backlighting
• Automotive instrument cluster display illumination
• Automotive center stack screen lighting

Procurement Notes

Verify the specific suffix KLPTR-T corresponds to the TSSOP-16 EP package and tape-and-reel quantity. Confirm AEC-Q100 qualification status for your target automotive grade requirements. Ensure input voltage specifications align with your system's load dump and cold crank profiles. Check moisture sensitivity level handling procedures during assembly.

Selection Notes

Select this component when designing backlighting for small LCDs requiring integrated boost conversion and dual-channel current control. It is suitable for applications needing robust transient immunity and wide input voltage tolerance. Consider its synchronization feature if EMI constraints require frequency shifting above the AM band. Evaluate the 120 mA per channel limit against total LED string requirements.

Part Context

This part belongs to Allegro MicroSystems' portfolio of automotive-grade LED drivers. It is specifically engineered for reliability in harsh automotive electrical environments. The device combines power management and sensing capabilities typical of the manufacturer's focus on high-performance solutions for vehicle electronics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical compatibility before considering alternative manufacturers or different Allegro series parts.

FAQ

What is the maximum number of LEDs supported per string?

The boost converter can drive up to 12 LEDs in series per string.

Can the LED current sinks be combined for higher current?

Yes, the LED sinks can be paralleled together to achieve higher LED currents, up to 240 mA.

What is the synchronization range for the switching frequency?

The sync function allows the boost converter switching frequency to be synchronized up to 2.3 MHz.