Diodes Incorporated AP3512EMTR-G1

Overview

AP3512EMTR-G1 from Diodes Incorporated is a 500kHz fixed-frequency, current-mode synchronous buck DC-DC converter delivering up to 2A output current with 4.5–18V input range, integrated N-channel high- and low-side MOSFETs (R_DS(ON) ≤ 100 mΩ each), and full protection including OVP (1.1V FB threshold), UVLO (4.0V typ), thermal shutdown (+160°C), and hiccup-mode short-circuit protection - deployed in consumer power rails for monitors and STBs.

For engineers reviewing the AP3512EMTR-G1 datasheet, AP3512EMTR-G1 pinout, AP3512EMTR-G1 application, or AP3512EMTR-G1 equivalent, this page delivers verified package mapping (SO-8EP), validated pin functions (e.g., BS for bootstrap drive, SS for programmable soft-start), real-world efficiency curves at light load, and confirmed alternative options for 3.3V/2A point-of-load conversion.

Technical Context

The AP3512EMTR-G1 implements peak-current-mode control with internal slope compensation, enabling fast transient response and inherent cycle-by-cycle current limiting. Its error amplifier features 800 µA/V transconductance and 400 V/V gain, interfacing directly with the COMP pin for loop stability via external RC network.

It integrates dual MOSFETs with matched R_DS(ON) (≤100 mΩ high-side, ≤100 mΩ low-side), operates across –40°C to +85°C ambient, and uses a dedicated BS pin to drive the high-side switch via external bootstrap capacitor - eliminating need for external gate driver or charge pump.

Key Specifications

Pinout & Package

AP3512EMTR-G1 is packaged in SO-8EP (exposed pad), offering 60°C/W junction-to-ambient thermal resistance - significantly lower than standard SO-8 (105°C/W) - and requiring PCB thermal pad connection to GND for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MP2315DJ-LF-Z and TPS54202DRCT, AP3512EMTR-G1 offers superior thermal performance via SO-8EP, robust hiccup-mode fault recovery, and tighter OVP accuracy (1.1V vs. ±3%), making it optimal for space-constrained, reliability-critical consumer power rails.

Availability

AP3512EMTR-G1 is available at Aetrix Electronics and suitable for monitor power supplies, set-top box core rails, and datacom interface modules requiring stable component supply, RoHS 3 compliance, and production-ready tape-and-reel packaging (4000 units per reel).

Supply support for AP3512EMTR-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The AP3512E belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for cost-sensitive, space-constrained consumer electronics requiring reliable 2A step-down conversion with integrated protection and green packaging.

FAQ

What is the recommended input capacitor configuration for AP3512EMTR-G1?

Use two 10µF X5R/X7R ceramic capacitors placed as close as possible to the IN and GND pins. This dual-capacitor layout reduces high-frequency impedance and suppresses switching noise. The SO-8EP package's low thermal resistance allows sustained 2A operation even with this minimal input staging, provided PCB layout follows recommended pad dimensions and ground plane coverage.

Can AP3512EMTR-G1 operate at 100% duty cycle?

No - the AP3512EMTR-G1 cannot achieve true 100% duty cycle due to bootstrap gate drive architecture. The BS pin requires periodic SW node discharge to recharge the bootstrap capacitor; minimum off-time is enforced by internal timing. For applications requiring 100% duty cycle, a controller with external high-side driver or integrated charge pump (e.g., AP6320x series) is required.

How does the hiccup-mode short-circuit protection behave under sustained fault?

When FB voltage drops below 0.3V (indicating severe overload or short), the AP3512EMTR-G1 enters hiccup mode: it disables switching, waits ~64ms, then attempts restart. If fault persists, it repeats the cycle. This limits average power dissipation to <1W during fault - preventing thermal runaway while enabling automatic recovery once short is removed.

Is the EXPOSED PAD (EP) electrically connected internally?

No - the EP is not internally connected to any die node; it serves solely as a thermal conduction path. It must be externally soldered to a large GND copper area on the PCB. Diodes Incorporated's datasheet explicitly states "EP should be connected to GND in PCB layout" - failure to do so degrades thermal performance by >40% and risks premature thermal shutdown under 2A load.