AP64352Q

Document number: DS42747 Rev. 1 - 2

1 of 21

www.diodes.com

June 2020

© Diodes Incorporated

AP64352Q

AUTOMOTIVE-COMPLIANT, 40V, 3.5A SYNCHRONOUS BUCK WITH INTERNAL COMPENSATION

Description

The AP64352Q is an automotive-compliant, 3.5A, synchronous buck

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

fully integrates a 75mΩ high-side power MOSFET and a 45mΩ low-

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

conversion.

The AP64352Q device is easily used by minimizing the external

component count due to its adoption of peak current mode control

along with its integrated loop compensation network.

The AP64352Q 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. AP64352Q 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 with the Following Results



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



Device HBM ESD Classification Level H2



Device CDM ESD Classification Level C5



VIN: 3.8V to 40V



3.5A Continuous Output Current



0.8V ±1% Reference Voltage



22µA Low Quiescent Current (Pulse Frequency Modulation)



Programmable Switching Frequency: 100kHz to 2.2MHz



External Clock Synchronization: 100kHz to 2.2MHz



Programmable Soft-Start Time



Up to 85% 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 AP64352Q 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

SS

GND

SW

(Top View)

SO-8EP

Applications



12V Automotive Power Systems



Automotive Infotainment



Automotive Instrument Clusters



Automotive Telematics



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.

(Top View)

SO-8EP