Diodes Incorporated AP4313KTR-G1

Overview

AP4313KTR-G1 from Diodes Incorporated is a constant voltage/constant current controller IC for SMPS applications, featuring a 1.21V ±1% voltage reference, 200mV current-sense reference, dual op-amps, 0.6mA typical supply current, and operation from -40°C to +105°C in SOT26 package. It enables precision CV/CC regulation in AC-DC adapters and battery chargers with low-side current sensing.

For engineers reviewing the AP4313KTR-G1 datasheet, AP4313KTR-G1 pinout, AP4313KTR-G1 application, or AP4313KTR-G1 equivalent, key selection criteria include transconductance gain (1–3.5 mA/mV for VCTRL, 1.5–7 mA/mV for ICTRL), output sinking capability (27–50 mA short-circuit current), thermal resistance (92°C/W), and RoHS/Green compliance for high-reliability power supply designs.

Technical Context

The AP4313 integrates two independent control loops: a voltage loop using an internal 1.21V reference and one op-amp to regulate output voltage via VCTRL, and a current loop using a 200mV reference and second op-amp to limit output current via ICTRL and VSENSE. Both loops operate with dedicated input bias specifications (≤50 nA at VCTRL, ≤25 µA at ICTRL) and support simultaneous CV/CC behavior in flyback and buck-derived topologies.

Its architecture enables direct low-side current sensing through VSENSE, while VOUT provides a sinking-only output stage (200 mV max VOL at 10 mA) for driving external MOSFET gates or optocoupler LEDs. The device requires no external reference and achieves stable compensation with minimal external components due to built-in transconductance stages and predictable loop dynamics.

Key Specifications

Pinout & Package

SOT26 (6-pin, surface-mount, 3.1 × 2.8 × 1.3 mm) with exposed pad thermal path; JEDEC-compliant footprint and 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant voltage/constant current controller applications.

Compared with TL431BIDBZR and OB2263MP, the AP4313KTR-G1 uniquely delivers fully independent, pin-accessible CV and CC loops in one SOT26 package-enabling precise secondary-side regulation without compromising layout simplicity or thermal performance.

Availability

AP4313KTR-G1 is available at Aetrix Electronics and suitable for AC-DC adapters, USB-C PD chargers, smartphone fast charging systems, and lithium-ion battery chargers requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP4313KTR-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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP4313 belongs to Diodes' Constant Voltage/Constant Current Controller product line, engineered specifically for secondary-side regulation in isolated SMPS-emphasizing integration, thermal robustness, and compliance with global environmental standards.

FAQ

What is the maximum allowable VCC voltage for AP4313KTR-G1?

The absolute maximum VCC rating is 20 V, but recommended operating range is 2.5 V to 18 V. Exceeding 18 V risks accelerated parametric drift and reduced long-term reliability, even if within absolute limits. Designs should maintain VCC below 18 V under all transient and startup conditions, including reflected spikes from transformer leakage inductance.

Can AP4313KTR-G1 drive a MOSFET gate directly?

Yes-VOUT is a current-sinking output capable of 27–50 mA short-circuit current and 200 mV low-level voltage, making it suitable for driving the LED side of an optocoupler or the gate of a low-threshold N-channel MOSFET (e.g., <1.5 V VGS(th)) in low-power configurations. It is not intended for high-speed switching or high-capacitance gate driving.

How does the 200 mV VSENSE reference improve current-sense accuracy?

The 200 mV reference enables direct use of low-value, low-TC shunt resistors (e.g., 10–50 mΩ) without amplification, reducing offset errors, noise pickup, and thermal EMF effects. Its ±2% tolerance over temperature ensures ±2% current limit accuracy without trimming, simplifying production calibration and improving consistency across batches.

Is AP4313KTR-G1 qualified for automotive applications?

No-AP4313KTR-G1 is specified for industrial temperature range (-40°C to +105°C) but is not AEC-Q200 qualified, lacks automotive-specific reliability testing (e.g., HTOL, ESD HBM ≥2 kV), and has no PPAP documentation. It is intended for commercial/industrial power supplies, not automotive ECUs, infotainment, or ADAS systems.