S-8521F36MC-BPVT2U

Overview

The S-8521F36MC-BPVT2U is a CMOS step-down switching regulator controller from the S-8520/8521 series, manufactured by ABLIC Inc. It utilizes PWM/PFM switching control to ensure high efficiency across varying load conditions. The device operates with an input voltage range of 2.5 V to 10 V and provides a fixed output voltage of 3.6 V. Designed for surface-mount installation in a compact SOT-23-5 package, it supports a maximum switching frequency of 375 kHz. The component functions within a temperature range of -40 °C to +85 °C and includes built-in protection features such as soft-start capability.

Feature Summary

• Operates in either PWM or PFM mode, automatically switching to PFM under light loads to maintain high efficiency
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Supports external Pch power MOS FET or PNP transistor configurations for step-down regulation

Applications

• Portable electronic devices requiring efficient power management
• Battery-powered equipment utilizing single-cell lithium-ion batteries
• Embedded systems needing stable 3.6 V logic supply rails

Procurement Notes

Verify the specific suffix BPVT2U against official ABLIC documentation to confirm tape-and-reel packaging specifications and marking codes. Ensure compatibility with external components such as inductors and capacitors based on the required switching frequency and load current. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing procurement orders.

Selection Notes

Select this controller when designing buck converters that require adaptive efficiency management between heavy and light loads. It is suitable for applications where space constraints necessitate the SOT-23-5 package. Designers must account for external power switches and passive components to achieve the desired output performance and thermal stability.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The series distinguishes itself by offering flexible control modes, allowing designers to optimize for either low ripple (PWM) or high efficiency (PFM). These controllers are part of ABLIC's broader portfolio of power management integrated circuits aimed at enhancing energy conservation in portable and industrial electronics.

Replacement Considerations

Direct replacements include other S-8521 series variants with compatible output voltages and pinouts, such as S-8521F33MC-BPVT2U for 3.3 V outputs. Verify that substitute parts maintain the same SOT-23-5 footprint and electrical characteristics regarding input voltage range and switching frequency.