S-8521F36MC-BPVT2G

Overview

The S-8521F36MC-BPVT2G is a CMOS step-down switching regulator controller from ABLIC Inc., designed for high-efficiency power conversion. It operates with an input voltage range of 2.5V to 10V and supports a fixed output voltage of 3.6V. The device utilizes PWM/PFM switching control, automatically transitioning between modes based on load conditions to maintain efficiency. It features a 60kHz switching frequency and operates within a temperature range of -40°C to 85°C. Packaged in a compact SOT-23-5 format, it includes internal reference voltage sources, oscillation circuits, error amplifiers, and soft-start functionality.

Feature Summary

• Supports automatic transition between PWM and PFM control modes for optimized efficiency across varying load conditions
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Provides linear duty ratio variation from 0% to 100% for precise regulation
• Includes built-in enable control functionality

Applications

• Battery-powered portable electronic devices requiring efficient step-down conversion
• Embedded systems utilizing single-cell lithium-ion battery inputs
• Low-power consumer electronics needing stable 3.6V logic supply rails
• Industrial equipment operating in wide temperature environments

Procurement Notes

Verify the specific suffix BPVT2G against official ABLIC documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status as per the latest datasheet revision. Check component availability status, as this part may be marked as not recommended for new designs. Ensure ordering quantities align with manufacturer standard packaging requirements.

Selection Notes

Select this controller when a fixed 3.6V output is required from a 2.5V to 10V input source. It is suitable for applications prioritizing efficiency at light loads due to its PFM capability. Consider external P-channel MOSFET or PNP transistor selection for the high-side switch. Verify that the 60kHz switching frequency meets EMI requirements for the target application.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8521 variant specifically distinguishes itself by supporting both PWM and PFM control schemes, unlike the S-8520 series which is limited to PWM. This series shares common internal architectures including error amplifiers and reference voltage sources, but offers flexible control strategies for different efficiency profiles.

Replacement Considerations

Direct substitutes include other parts from the S-8521 family with compatible output voltages and packages. Verify pin compatibility and electrical parameters such as input voltage range and switching frequency before substitution.