Diodes Incorporated AP4310AMTR-G1

Overview

AP4310AMTR-G1 from Diodes Incorporated is a dual operational amplifier with integrated 2.5 V precision shunt voltage reference, designed for voltage and current regulation in switching battery chargers and DC-DC power supplies. It features two independent op amps (Op Amp 1 for voltage control with internal VREF connection; Op Amp 2 for uncommitted current sensing), ±0.4% reference tolerance, 0.5 mV input offset voltage, and operates from 3 V to 36 V supply.

For engineers reviewing the AP4310AMTR-G1 datasheet, AP4310AMTR-G1 pinout, AP4310AMTR-G1 application, or AP4310AMTR-G1 equivalent, this device serves as a compact, cost-effective feedback controller for CC/CV charging loops and isolated SMPS regulation where precision reference stability and low quiescent current are critical.

Technical Context

The AP4310A integrates two functionally distinct op amps: Op Amp 1's non-inverting input is hardwired to the 2.5 V reference output (Pin 3/VKA), enabling direct voltage error amplification; Op Amp 2 has fully uncommitted inputs (Pins 5/6) for external current-sense signal conditioning. Both op amps share a common 3–36 V supply rail and operate over –40°C to +105°C.

Its 2.5 V shunt reference delivers 0.2 Ω typical dynamic impedance and supports 0.05–80 mA sink current, enabling stable regulation across wide load and temperature ranges. The IC uses SO-8 packaging with exposed thermal pad compatibility and is fully RoHS-compliant, halogen-free, and lead-free per EU directives.

Key Specifications

Pinout & Package

AP4310AMTR-G1 is housed in an SO-8 surface-mount package (JEDEC MS-012AC, 6.2 mm × 5.1 mm × 1.75 mm), with standard 1.27 mm pitch and gull-wing leads. Thermal performance is enhanced by internal die attach to exposed copper slug (non-electrical).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-op-amp-with-reference applications.

Compared with TL431+LM358, AP4310AMTR-G1 reduces board area by 65% and quiescent current by 80%; versus AP4313AMTR-G1, it provides true dual-loop integration essential for battery charging compliance and isolated SMPS stability.

Availability

AP4310AMTR-G1 is available at Aetrix Electronics and suitable for battery charger design, isolated flyback power supplies, USB-C PD adapters, and industrial DC-DC converters requiring stable component supply with guaranteed long-term availability.

Supply support for AP4310AMTR-G1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP4310A belongs to Diodes' precision analog power control product line, engineered specifically to replace multi-component feedback networks in battery charging and isolated power conversion systems with monolithic, thermally robust, and qualification-ready ICs.

FAQ

What is the maximum sink current supported by the AP4310AMTR-G1 reference section?

The AP4310AMTR-G1 reference section supports a cathode current range of 0.05 mA to 80 mA, with absolute maximum rating of 100 mA. At 80 mA, the reference maintains ±0.4% tolerance and 0.5 Ω dynamic impedance, enabling direct drive of optocoupler LEDs without external transistors in most 5–24 V output designs.

Can Op Amp 2 be used independently of the internal voltage reference?

Yes - Op Amp 2 has fully uncommitted inputs (Pins 5 and 6) and does not rely on the internal 2.5 V reference. Its inputs accept any voltage within the 0 V to VCC–1.5 V common-mode range, allowing use with external references, DAC outputs, or differential current-sense signals without modification.

Does the AP4310AMTR-G1 require external compensation components?

Yes - like most error amplifiers in SMPS feedback loops, AP4310AMTR-G1 requires external RC compensation (typically Type II or III network) between OUTPUT 1 and INPUT 1– to ensure loop stability. The datasheet provides recommended values for 100–500 kHz converters, including pole-zero placement guidance based on output capacitor ESR and transformer turns ratio.

Is the SO-8 package of AP4310AMTR-G1 thermally enhanced?

No - the standard SO-8 package (MS-012AC) used for AP4310AMTR-G1 lacks an exposed thermal pad. Thermal dissipation relies on copper pour on PCB pads and standard JEDEC footprint; maximum power dissipation is 500 mW at TA = +25°C, derating linearly above 25°C per the datasheet's thermal resistance curve (θJA = 120°C/W).