AS3691A-ZTSP

Overview

The AS3691A-ZTSP is a high-efficiency, single-cell LED driver designed for portable applications. It integrates a synchronous buck-boost converter capable of driving a single white LED from input voltages ranging below to above the LED forward voltage. The device supports constant current regulation with programmable output current via an external resistor. Key electrical parameters include an input voltage range of 2.0V to 5.5V and a maximum output current of 1400mA. It operates at a switching frequency of 1.2MHz and features thermal shutdown protection.

Feature Summary

• Integrated synchronous buck-boost topology ensures high efficiency across varying input and load conditions.
• Programmable constant current output allows precise control of LED brightness levels.
• Compact packaging minimizes footprint for space-constrained mobile devices.

Applications

• Smartphone camera flash illumination
• Tablet device backlighting
• Portable electronic device indicator lights

Procurement Notes

Verify the specific suffix 'ZTSP' against the manufacturer's official datasheet to confirm tape-and-reel packaging specifications and environmental compliance status. Ensure compatibility with your PCB layout guidelines regarding thermal pads and inductor selection as defined in the reference design documentation.

Selection Notes

Select this component when a single-cell battery supply must drive a high-current white LED efficiently. Consider the required peak current and duty cycle constraints relative to the battery voltage profile. Verify that the chosen external inductor meets the saturation current requirements specified in the electrical characteristics table.

Part Context

This part belongs to the AS369x family of LED drivers from ams OSRAM. These components are engineered for mobile consumer electronics requiring compact power management solutions. The series typically includes variants with different current capabilities or interface options, tailored for flash and ambient light applications in smartphones and tablets.

Replacement Considerations

Consult the manufacturer's cross-reference guide for direct pin-compatible alternatives. Verify that any substitute maintains the same buck-boost architecture and current rating to ensure functional equivalence in existing designs without requiring schematic modifications.

FAQ

What is the maximum output current supported by the AS3691A?

The device supports a maximum output current of 1400mA, which can be adjusted using an external programming resistor.

Does the AS3691A support dimming?

Yes, the device supports analog dimming through the DIM pin and digital control via the I2C interface for precise brightness adjustment.