S-8521C34MC-BTTT2G

Overview

The S-8521C34MC-BTTT2G is a CMOS step-down switching regulator controller from the S-8521 series, manufactured by ABLIC Inc. It utilizes PWM/PFM switching control to maintain high efficiency across varying load conditions. The device features a fixed output voltage of 3.4V and operates with a switching frequency of 60kHz. It supports an input supply voltage range of 2.5V to 10V and provides a single positive output configuration. The component is housed in a SC-74A (SOT-753) surface-mount package and is rated for operation within a temperature range of -40°C to 85°C.

Feature Summary

• Supports automatic switching between PWM and PFM control modes to optimize efficiency under light loads
• Integrates a soft-start circuit to prevent output voltage overshoot during startup
• Includes an enable function for precise power management control

Applications

• Battery-powered portable electronic devices requiring efficient power conversion
• Embedded systems utilizing low-voltage DC power rails
• Consumer electronics with strict standby power consumption requirements

Procurement Notes

Verify the specific suffix codes against the official datasheet to confirm output voltage accuracy and package type. Ensure compatibility with external components such as MOSFETs and inductors for the intended application. Confirm RoHS compliance status and check for any obsolescence notices or design-in restrictions prior to finalizing procurement plans.

Selection Notes

Select this model when a fixed 3.4V output is required with integrated light-load efficiency optimization. The S-8521 series is suitable for applications needing both high efficiency at full load and low quiescent current in standby. Compare against the S-8520 series if pure PWM control without PFM transition is preferred for specific ripple characteristics.

Part Context

This component belongs to the S-8521 series of step-down switching regulator controllers. The series is designed to provide flexible power management solutions by combining PWM and PFM controls. It shares the same basic architecture as the S-8520 series but adds adaptive control capabilities for improved performance across different load ranges.

Replacement Considerations

S-8521D34MC-BXMT2U offers similar functionality with a wider input voltage range up to 16V. S-8520A34MC-AVTT2U provides equivalent 3.4V output but uses only PWM control without PFM switching.