S-8356Q31MC-OYQT2U

Overview

The S-8356Q31MC-OYQT2U is a CMOS step-up switching regulator controller from the S-8356 series by ABLIC Inc. It operates with an input voltage range of 0.9 V to 10 V and provides a fixed output voltage of 3.1 V. The device utilizes a PWM/PFM switching control circuit, maintaining a typical operating current consumption of 25.9 uA. It supports a switching frequency of 600 kHz and features a maximum duty ratio of 85%. Packaged in an SOT-23-5 surface-mount configuration, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a PWM/PFM switching control circuit that automatically transitions to PFM mode under light loads to maintain high efficiency.
• Supports low-voltage startup at 0.9 V minimum, ensuring operation with depleted power sources.
• Features a built-in error amplifier and phase compensation circuit for stable regulation.

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Systems utilizing single-cell lithium-ion or lithium-polymer batteries
• Low-power consumer electronics needing extended battery life

Procurement Notes

Verify the specific output voltage setting matches the target application requirements, as the suffix indicates a fixed 3.1 V output. Confirm package compatibility with the SOT-23-5 footprint during PCB layout. Ensure the external power MOSFET selected has a sufficiently low ON-resistance to achieve optimal efficiency levels specified in the datasheet.

Selection Notes

Select this component when a fixed 3.1 V boost output is required from a supply ranging between 0.9 V and 10 V. The S-8356 series is suitable for designs prioritizing low quiescent current and high efficiency across varying load conditions. Compare against other series variants if different switching frequencies or control modes are necessary for the specific noise or transient response constraints.

Part Context

This part belongs to the S-8355/56/57/58 series of CMOS step-up switching regulator controllers manufactured by ABLIC Inc. The series is characterized by super-small packages and integrated control circuits designed for high-efficiency DC-DC conversion. These controllers require external power components to complete the switching regulator topology.

Replacement Considerations

S-8356Q31MC-OYJT2U

FAQ

How does the S-8356Q31MC-OYQT2U manage efficiency under light load conditions?

It employs a PWM/PFM switching control circuit that switches to Pulse Frequency Modulation (PFM) mode with a fixed duty ratio under light loads to prevent efficiency decline caused by IC operating current.

What is the minimum input voltage required for startup?

The device guarantees startup at a minimum input voltage of 0.9 V when the output current is 1 mA.