Datasheet AP64351Q (Diodes)

AP64351Q AUTOMOTIVE-COMPLIANT, 40V, 3.5A SYNCHRONOUS BUCK WITH PROGRAMMABLE SOFT-START TIME Description Pin Assignments
The AP64351Q is an automotive-compliant, 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device
(Top View)
fully integrates a 75mΩ high-side power MOSFET and a 45mΩ low-
(Top View)
side power MOSFET to provide high-efficiency step-down DC-DC conversion.
BST 1 8 SW
The AP64351Q device is easily used by minimizing the external
VIN 2 7 GND
component count due to its adoption of peak current mode control.
EXPOSED PAD 9
The AP64351Q design is optimized for Electromagnetic Interference
EN 3 6 COMP
(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
SS 4 5 FB
caused by MOSFET switching. AP64351Q also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%,
SO- SO 8 - EP EP
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 Applications
AEC-Q100 Qualified with the Following Results 12V Automotive Power Systems  Device Temperature Grade 1: -40°C to +125°C TA Range Automotive Infotainment  Device HBM ESD Classification Level H2 Automotive Instrument Clusters  Device CDM ESD Classification Level C5 Automotive Telematics VIN: 3.8V to 40V Advanced Driver Assistance Systems 3.5A Continuous Output Current 0.8V ± 1% Reference Voltage 22µA Low Quiescent Current (Pulse Frequency Modulation) 570kHz Switching Frequency 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 AP64351Q 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/
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. AP64351Q 1 of 26 June 2020 Document number: DS42746 Rev. 1 - 2
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