S-8533A49AFT-TB-G

Overview

The S-8533A49AFT-TB-G is a synchronous step-down switching controller manufactured by ABLIC. It operates within an input voltage range of 2.7 V to 16 V and delivers a fixed output voltage of 4.9 V. The device integrates a high-speed PWM control circuit with a switching frequency of 1.2 MHz, enabling the use of compact external components. It features a TSSOP-8 package and supports an operating temperature range from -40 °C to +105 °C. Key functional blocks include an error amplifier, oscillator, and gate drivers for external N-channel MOSFETs.

Feature Summary

• Integrates a synchronous rectification control circuit for efficient power conversion
• Features a fixed 1.2 MHz internal switching frequency to minimize external component size
• Includes built-in protection mechanisms such as overcurrent detection and thermal shutdown

Applications

• Portable electronic devices requiring stable low-voltage power rails
• Industrial equipment power distribution systems
• Automotive infotainment and sensor modules

Procurement Notes

Verify the specific suffix 'TB-G' against the manufacturer's latest datasheet to confirm lead-free status and tape-and-reel packaging specifications. Ensure compatibility with the required 4.9 V output configuration. Cross-reference the part number with official distributor catalogs to confirm current availability and compliance with RoHS directives before finalizing procurement orders.

Selection Notes

Select this component when a fixed 4.9 V output is required from a 2.7 V to 16 V input source. The 1.2 MHz switching frequency allows for smaller inductors and capacitors compared to lower-frequency alternatives. Verify that the external MOSFETs selected can handle the expected load current and switching losses at the maximum operating temperature of 105 °C.

Part Context

This part belongs to the S-8533A series of synchronous step-down controllers. The series is designed for applications requiring high efficiency and compact footprint. The 'A' variant typically denotes specific electrical characteristics or pinout configurations within the broader family. The TSSOP-8 package provides a balance between thermal performance and board space efficiency for surface-mount assembly.

Replacement Considerations

Direct replacements must match the 4.9 V fixed output, 1.2 MHz frequency, and TSSOP-8 package. Verify pin-to-pin compatibility if substituting with other manufacturers' synchronous buck controllers. Ensure the alternative device supports the same input voltage range and offers comparable protection features.