AS3691B-ZTSP

Overview

The AS3691B-ZTSP is a linear LED driver IC manufactured by ams-OSRAM USA INC. It features four independent output channels, each capable of sourcing up to 400 mA. The device operates within a supply voltage range supporting up to 15 V output and functions at a switching frequency of 20 kHz. It is housed in a 20-pin TSSOP package with exposed pad for surface mount installation. The component supports an operating temperature range from -20°C to +85°C and includes internal switches for efficient power management.

Feature Summary

• Four-channel linear current sink architecture for precise RGB LED control
• Integrated internal switches reduce external component count
• Supports PWM dimming for brightness adjustment
• Compact TSSOP-20 package with thermal pad

Applications

• RGB LED backlighting for displays
• General solid-state lighting systems
• Automotive interior illumination
• Consumer electronics indicator lights

Procurement Notes

Verify the exact suffix ZTSP confirms the 20-TSSOP package variant. Confirm end-of-life status as some sources indicate discontinuation. Check moisture sensitivity level (MSL 3) requirements for storage and handling. Ensure compatibility with existing PCB footprint for TSSOP-20 with exposed pad. Validate supply voltage limits against system design constraints.

Selection Notes

Select this part when four independent constant current outputs are required for RGB applications. Compare pinout and package dimensions against alternatives like AS3691A if QFN packaging is preferred. Verify current matching specifications across channels for color consistency. Consider thermal performance given the 2 W power dissipation rating in the selected package.

Part Context

The AS3691B belongs to the AS3691 family of LED drivers from ams OSRAM. It shares core functionality with variants like AS3691A but differs in package type. The family targets multi-channel LED control for lighting and display backlights. This specific model uses TSSOP-20 instead of the QFN-24 found in other series members.

Replacement Considerations

AS3691A-ZQFP offers identical electrical performance in a 24-QFN package. Cross-reference pinouts carefully due to package differences. Verify that the alternative package fits the mechanical constraints of the target design.