NCP4300AD

Overview

The NCP4300AD is a monolithic integrated circuit designed for switch mode battery chargers and power supplies. It integrates a precision 2.6 V shunt reference with two operational amplifiers. Op-Amp 1 performs voltage control with its non-inverting input connected to the internal reference, while Op-Amp 2 provides independent current control. The device operates within a supply voltage range of 3.0 V to 35 V and features a low input offset voltage of 0.5 mV. It utilizes an 8-lead SOIC surface mount package.

Feature Summary

• Integrates a precision 2.6 V band gap voltage reference with high temperature stability.
• Features a dedicated voltage sensing operational amplifier with fixed threshold control.
• Includes an independent general-purpose operational amplifier for current sensing applications.

Applications

• Constant-current constant-voltage switch mode battery chargers
• Switch mode power supply output regulation
• Power converter feedback loop circuits

Procurement Notes

Verify the specific ordering suffix when purchasing. The 'D' suffix indicates the SOIC-8 package variant. Confirm lead-free status requirements against project specifications. Ensure the selected part number matches the required tape and reel or rail packaging configuration for assembly compatibility.

Selection Notes

Select this component for designs requiring simultaneous voltage and current regulation in a compact form factor. The integrated reference eliminates external biasing needs. Verify that the operating supply voltage remains within the specified 3.0 V to 35 V range. Consider the thermal resistance characteristics for heat dissipation in enclosed environments.

Part Context

This device belongs to onsemi's analog regulation control family. It consolidates multiple discrete components into a single IC to reduce system complexity. The design targets cost-sensitive power conversion applications where precise output monitoring is critical for safety and efficiency.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult official manufacturer resources for cross-reference data before implementation.

FAQ

How is the output voltage regulated?

Op-Amp 1 monitors the system output via an external resistor divider. Its non-inverting input is internally connected to the 2.6 V reference, allowing the output voltage to be configured above this threshold.

What is the function of Op-Amp 2?

Op-Amp 2 serves as an independent operational amplifier with uncommitted inputs. It is primarily utilized for current sensing in constant current regulator configurations.