NCP4300ADG

Overview

The NCP4300ADG is a dual operational amplifier and voltage reference integrated circuit designed for switch mode battery chargers and power supplies. It integrates a precision 2.6 V shunt reference with two op-amps, where Op-Amp 1 handles voltage control via an internal reference connection, and Op-Amp 2 serves as an independent current control amplifier. The device operates within a supply voltage range of 3.0 V to 35 V and supports an ambient temperature range of 0°C to 105°C. It features a low input offset voltage of 0.5 mV typical, a unity gain bandwidth of 0.7 MHz, and a total supply current of approximately 0.8 mA at 5.0 V. Packaged in an SOIC-8 surface mount format.

Feature Summary

• Integrates a precision 2.6 V bandgap voltage reference with high temperature stability
• Features a dedicated voltage sensing operational amplifier with internally connected reference input
• Includes an independent general-purpose operational amplifier for flexible current sensing applications
• Supports ground-referenced input common mode voltage range

Applications

• Constant-current constant-voltage switch mode battery chargers
• Switch mode power supply output regulation
• Precision voltage monitoring circuits

Procurement Notes

Verify the specific ordering suffix 'DG' corresponds to the SOIC-8 tube packaging configuration containing 98 units per rail, distinct from the tape and reel options available for this family. Confirm RoHS compliance status and lead times directly with authorized onsemi distributors or the manufacturer prior to finalizing procurement plans.

Selection Notes

Select this component when simultaneous closed-loop voltage and current regulation is required using a single monolithic package. The fixed 2.6 V internal reference simplifies external resistor divider design for voltage setting. Ensure the application supply voltage remains within the 3.0 V to 35 V operating range and that the thermal environment stays within the specified 0°C to 105°C limit for optimal performance.

Part Context

This device belongs to the NCP4300A series of analog regulation control circuits. It consolidates basic feedback loop building blocks, including amplifiers and summing circuitry, into one IC to reduce system complexity. The NCP4300A/D datasheet defines the electrical characteristics and functional descriptions for this specific dual op-amp and reference combination.

Replacement Considerations

NCP4300ADR2G

FAQ

How is the output voltage threshold determined?

The voltage regulation threshold is fixed at 2.6 V by the internal precision reference. Any desired output voltage above this level is configured using an external resistor divider network connected to the inverting input of Op-Amp 1.

What is the function of Op-Amp 2?

Op-Amp 2 is an independent operational amplifier with all terminals uncommitted. It is typically utilized for current sensing in constant current regulator applications due to its low input offset voltage.