AP64100Q

Document number: DS43575 Rev. 1 - 2

1 of 26

www.diodes.com

July 2021

© Diodes Incorporated

AP64100Q

AUTOMOTIVE-COMPLIANT, 40V, 1A SYNCHRONOUS BUCK WITH ADJUSTABLE FREQUENCY

Description

The AP64100Q is an automotive-compliant, 1A, synchronous buck

converter with a wide input voltage range of 3.8V to 40V. The device

fully integrates a 150

mΩ high-side power MOSFET and an 80mΩ low-

side power MOSFET to provide high-efficiency step-down DC-DC

conversion.

The AP64100Q device is easily used by minimizing the external

component count due to its adoption of peak current mode control.

The AP64100Q design is optimized for Electromagnetic Interference

(EMI) reduction. The device has a proprietary gate driver scheme to

resist switching node ringing without sacrificing MOSFET turn-on and

turn-off times, which reduces high-frequency radiated EMI noise

caused by MOSFET switching.

The AP64100Q also features

Frequency Spread Spectrum (FSS) with a switching frequency jitter of

±6%, which reduces EMI by not allowing emitted energy to stay in any

one frequency for a significant period of time.

The device is available in an SO-8EP package.

Features



AEC-Q100 Qualified for Automotive Applications



Device Temperature Grade 1: -40°C to +125°C TA Range



VIN: 3.8V to 40V



Output Voltage (VOUT): 0.8V to VIN



1A Continuous Output Current



0.8V ±1% Reference Voltage



25µA Low Quiescent Current (Pulse Frequency Modulation)



Adjustable Switching Frequency: 100kHz to 2.2MHz



External Clock Synchronization: 100kHz to 2.2MHz



Up to 88% Efficiency at 5mA Light Load



Proprietary Gate Driver Design for Best EMI Reduction



Frequency Spread Spectrum (FSS) to Reduce EMI



Low-Dropout (LDO) Mode



Precision Enable Threshold to Adjust UVLO



Protection Circuitry



Undervoltage Lockout (UVLO)



Output Overvoltage Protection (OVP)



Cycle-by-Cycle Peak Current Limit



Thermal Shutdown



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)



The AP64100Q is suitable for automotive applications

requiring specific change control; this part is AEC-Q100

qualified, PPAP capable, and manufactured in IATF 16949

certified facilities.

https://www.diodes.com/quality/product-definitions/

Pin Assignments

EXPOSED PAD

9

1

2

3

4

5

6

7

8

BST

VIN

EN

RT/CLK

FB

COMP

GND

SW

(Top View)

SO-8EP

Applications



Automotive Power Systems



Automotive Infotainment



Automotive Instrument Clusters



Automotive Telematics



Automotive Lighting Control



Advanced Driver Assistance Systems

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.