Diodes Incorporated AP3427MDNTR-G1

Overview

AP3427MDNTR-G1 from Diodes Incorporated is a dual-channel synchronous step-down DC-DC converter with peak-current mode control, 1.5MHz fixed switching frequency, 2.5V–5.5V input range, and independent 1A per channel output capability. It integrates high-side and low-side MOSFETs (200mΩ R_DS(ON) each at V_IN=5V), 600mV feedback reference, and full protection including UVLO, thermal shutdown, short-circuit, and input overvoltage-designed for compact portable power rails in PDAs and notebook computers.

For engineers reviewing the AP3427MDNTR-G1 datasheet, AP3427MDNTR-G1 pinout, AP3427MDNTR-G1 application, or AP3427MDNTR-G1 equivalent, key selection criteria include dual 1A output capability with independent enable/feedback pins, U-DFN3030-10 package thermal performance (θ_JA = 41°C/W), adjustable output down to 0.6V, and integrated soft-start timing (400μs).

Technical Context

The AP3427MDNTR-G1 implements a dual independent peak-current mode controller with internal 1.5MHz oscillator and no external timing components required. Each channel features separate EN, FB, VIN, and LX pins, enabling asynchronous start-up and independent output regulation.

It uses integrated synchronous rectification with matched 200mΩ PMOS/NMOS switches per channel, eliminating external Schottky diodes and supporting 100% duty-cycle low-dropout operation. Protection functions-including UVLO (2.3V rising, 2.1V falling), thermal shutdown at +155°C, and input overvoltage lockout at 6.2V-are fully embedded and non-latching.

Key Specifications

Pinout & Package

AP3427MDNTR-G1 is housed in a thermally enhanced U-DFN3030-10 package (3.0mm × 3.0mm × 0.6mm) with an exposed thermal pad (Pin 4/9/Exposed Pad) for direct PCB copper connection to improve heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel buck regulator applications.

Compared with TPS65023BRSBR and RTQ2132BGQW, AP3427MDNTR-G1 offers optimal balance of dual 1A capability, 2.5V minimum input, and U-DFN3030-10 thermal performance-ideal for space-constrained 5V-input portable systems where simplicity and proven reliability are prioritized over multi-rail expansion or ultra-high current.

Availability

AP3427MDNTR-G1 is available at Aetrix Electronics and suitable for mobile computing power rails, portable industrial sensors, medical handheld devices, and automotive infotainment accessories requiring stable component supply and RoHS-compliant green packaging.

Supply support for AP3427MDNTR-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 AP3427M belongs to Diodes' high-density synchronous buck converter product line, engineered specifically for compact, battery-powered portable electronics demanding dual independent power rails with minimal external components and robust fault protection.

FAQ

What is the recommended minimum input capacitance for stable operation?

Diodes specifies 4.7μF ceramic input capacitance per channel (CIN1/CIN2) placed within 3mm of VIN and GND pins. Use X5R/X7R dielectrics rated ≥10V; parallel with 100nF for high-frequency noise suppression. Total effective capacitance must remain ≥4.7μF after DC bias derating at maximum input voltage.

Can AP3427MDNTR-G1 operate with only one channel enabled?

Yes-EN1 and EN2 are fully independent. Disabling one channel (ENx = low) places its associated MOSFETs in high-impedance state, reducing quiescent current to ≤0.1μA. The enabled channel continues normal regulation with no cross-talk or instability, verified per DS39604 Section 7.3.

Is the exposed thermal pad electrically connected to GND internally?

Yes-the exposed pad (Pins 4, 9, and Exposed Pad) is internally tied to GND. It must be soldered to a dedicated PCB thermal pad connected to ≥4cm² of inner-layer ground copper via ≥6 thermal vias (0.3mm diameter, 0.8mm pitch) to achieve θ_JA = 41°C/W and prevent thermal shutdown under 1A load.

Does AP3427MDNTR-G1 support forced PWM or PFM mode selection?

No-it operates exclusively in forced continuous conduction mode (CCM) at 1.5MHz. There is no pin or register to enable discontinuous conduction mode (DCM) or pulse-frequency modulation (PFM). Light-load efficiency is maintained via low quiescent current (220μA typical) rather than frequency scaling.