S-8521D50MC-BYJT2U

Overview

The S-8521D50MC-BYJT2U is a CMOS step-down switching regulator controller from the S-8521 series by ABLIC Inc. It features switchable PWM/PFM control modes to optimize efficiency across varying load conditions. The device integrates a reference voltage source, oscillation circuit, and error amplifier within an SOT-23-5 package. It operates with an input voltage range of 2.5 V to 16 V and supports output voltages down to 0.9 V. The typical operating current is 100 µA, and it functions reliably within a temperature range of -40°C to +85°C.

Feature Summary

• Switchable PWM/PFM control mode for optimized light-load efficiency
• Integrated reference voltage source and error amplifier
• Low standby current consumption for battery-powered applications

Applications

• Portable electronic devices requiring efficient power management
• Battery-operated equipment needing extended runtime
• General-purpose DC-DC converter designs

Procurement Notes

Verify the specific suffix BYJT2U against the official ABLIC datasheet to confirm pinout and electrical characteristics. Confirm RoHS compliance status directly with the manufacturer or authorized distributors. Check for any recent product change notices (PCN) that may affect material composition or marking. Ensure the sourcing channel provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when designing step-down converters requiring adjustable output voltages below the input rail. The switchable control mode makes it suitable for applications with wide dynamic load ranges. Compare its quiescent current and switching frequency against alternatives if low noise or high efficiency at light loads is critical. Ensure external inductor and capacitor selections match the controller's drive capabilities and stability requirements.

Part Context

This part belongs to the S-8521 series of CMOS step-down switching regulator controllers manufactured by ABLIC Inc. The series is designed for high-efficiency power conversion in portable electronics. It shares architectural similarities with the S-8520 series but adds PFM capability for improved light-load performance. The SOT-23-5 package allows for compact PCB layouts in space-constrained designs.

Replacement Considerations

The S-8520F45MC-BOET2U is a related component within the same family but lacks the switchable PFM feature. Verify compatibility regarding control mode requirements and output voltage adjustability before substitution. Other S-8521 variants with different output voltage settings or package options may serve as direct replacements if electrical parameters align.