S-8520F50MC-BOJT2G

Overview

The S-8520F50MC-BOJT2U is a CMOS step-down switching regulator controller from the S-8520 series, manufactured by ABLIC Inc. It utilizes Pulse Width Modulation (PWM) control to provide low-ripple power and high efficiency. The device features a fixed output voltage of 5.0V and operates within an input voltage range of 2.5V to 10V. It supports a switching frequency of 180kHz with a maximum duty cycle of 100%. The component is housed in a compact SOT-23-5 package and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• Employs PWM control circuitry capable of linearly varying the duty ratio from 0% up to 100% for stable regulation.
• Integrates a built-in error amplifier and soft-start circuit to prevent output overshoot during startup.
• Delivers high efficiency and excellent transient characteristics suitable for demanding power applications.

Applications

• Portable electronic devices requiring efficient step-down power conversion
• Battery-powered equipment utilizing single-cell lithium-ion or lithium-polymer sources
• General-purpose DC-DC converter designs in consumer electronics

Procurement Notes

Verify the specific suffix against official documentation, as distributor listings may contain typos such as 'T2U' instead of 'T2G'. Confirm RoHS compliance status and ensure the ordering code matches the exact voltage and package variant required for your design. Cross-reference the manufacturer's part number directly to avoid discrepancies in automated procurement systems.

Selection Notes

Select this controller when a fixed 5.0V output is required without external feedback resistors. It is appropriate for designs prioritizing simplicity and cost-efficiency over adjustable output flexibility. Ensure the external MOSFET and inductor selection aligns with the 180kHz switching frequency and current requirements of the target application.

Part Context

This component belongs to the S-8520/8521 series of CMOS step-down switching regulator controllers. The S-8520 series specifically focuses on PWM control for consistent performance, distinguishing it from the S-8521 series which offers PWM/PFM switching modes. This family is designed to provide reliable power management solutions for various portable and industrial applications.

Replacement Considerations

The S-8520E22MC-BJH-T2G serves as a functional substitute within the same series, offering similar PWM control topology and package options. Verify that the alternative part meets the specific voltage and thermal requirements of the original design before implementation.

FAQ

Does the S-8520F50MC-BOJT2U support synchronous rectification?

No, the S-8520 series does not include a built-in synchronous rectifier. It requires an external Pch power MOS FET or PNP transistor along with a diode to function as a step-down switching regulator.

What is the purpose of the soft-start circuit in this IC?

The integrated soft-start circuit prevents output voltage overshoot at startup, ensuring a controlled ramp-up of the output voltage to protect connected loads.