Diodes Incorporated AP64100SP-13

Overview

AP64100SP-13 from Diodes Incorporated is a 1A synchronous buck DC-DC converter with 3.8V–40V input range, integrated 150mΩ high-side and 80mΩ low-side MOSFETs, adjustable 100kHz–2.2MHz switching frequency, 0.8V ±1% reference, and 25μA quiescent current in PFM mode-designed for EMI-sensitive industrial power tools, white goods, and network systems.

For engineers reviewing the AP64100SP-13 datasheet, AP64100SP-13 pinout, AP64100SP-13 application, or AP64100SP-13 equivalent, key selection criteria include its proprietary ringing-free gate driver, Frequency Spread Spectrum (±6% jitter), precision EN threshold (1.18V), cycle-by-cycle current limiting, and SO-8EP thermal performance (θJA = 45°C/W).

Technical Context

The AP64100 employs fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its proprietary multi-level gate driver suppresses SW node ringing without degrading rise/fall times, directly reducing high-frequency radiated EMI.

It supports dual frequency control: resistor-programmed (RT/CLK to GND) or external clock synchronization (100kHz–2.2MHz via PLL), enabling system-level noise coordination. The device transitions from forced PWM at heavy load to PFM at light load (down to 5mA), maintaining up to 88% efficiency while drawing only 25μA IQ.

Key Specifications

Pinout & Package

The AP64100SP-13 is housed in an SO-8EP (Standard) package with exposed thermal pad (Pin 9), optimized for PCB heat dissipation (θJC = 5°C/W). Pin 1 (BST) requires a 100nF BST-to-SW capacitor for high-side gate drive; Pin 4 (RT/CLK) serves dual function for frequency programming or external clock sync; Pin 7 (GND) and exposed pad must be connected to a solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2451DT-LF-Z and TPS54202DRCT, the AP64100SP-13 uniquely combines wide 3.8V–40V operation, SO-8EP thermal performance, and dual EMI reduction (ringing-free SW + FSS), making it optimal for space-constrained, emissions-critical industrial and consumer applications where input voltage variation and thermal headroom are design priorities.

Availability

AP64100SP-13 is available at Aetrix Electronics and suitable for distributed power bus supplies, power tools, and home audio systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP64100SP-13 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 AP64100 belongs to Diodes' high-efficiency, EMI-optimized buck converter product line-designed specifically for applications demanding wide input range, low quiescent current, and certified electromagnetic compatibility without external filters.

FAQ

What is the minimum input voltage required for reliable startup?

The AP64100SP-13 has a power-on reset (POR) threshold of 3.5V (typical) and undervoltage lockout (UVLO) falling threshold of 3.1V. Startup is guaranteed once VIN rises above 3.5V, and the device remains enabled until VIN drops below 3.1V. The EN pin's 1.18V logic-high threshold allows precise UVLO adjustment using external resistors if higher turn-on voltage is needed.

Can the AP64100SP-13 synchronize to an external clock, and what is the supported frequency range?

Yes, the AP64100SP-13 supports external clock synchronization via the RT/CLK pin. It accepts TTL/CMOS-compatible clock signals from 100kHz to 2.2MHz and uses an internal PLL to lock to the external frequency. If the external clock stops, the device automatically reverts to its resistor-programmed frequency setting, ensuring uninterrupted operation.

How does the AP64100SP-13 achieve EMI reduction without adding external components?

The AP64100SP-13 integrates two EMI-reduction techniques: a proprietary multi-level gate driver that eliminates SW node ringing while preserving fast switching edges, and Frequency Spread Spectrum (FSS) with ±6% jitter. These features reduce both radiated and conducted emissions at source, eliminating need for ferrite beads or additional LC filters in many Class B applications.

What thermal considerations apply to the SO-8EP package in continuous 1A operation?

In SO-8EP with recommended 4-layer FR-4 PCB (2oz copper, minimum pad layout), the AP64100SP-13 achieves θJA = 45°C/W. At 1A output with 12V input and 5V output, typical power dissipation is ~0.5W; junction temperature rise is ~22.5°C above ambient. For 85°C ambient, TJ stays below 125°C. Thermal derating is required above 70°C ambient or with reduced copper area.