AP64500Q AUTOMOTIVE-COMPLIANT, 40V, 5A SYNCHRONOUS BUCK WITH PROGRAMMABLE FREQUENCY Description Pin Assignments The AP64500Q is an automotive-compliant, 5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 45m high -side power MOSFET and a 20m low - (Top View) side power MOSFET to provide high-efficiency step-down DC-DC conversion. BST 1 8 SW The AP64500Q device is easily used by minimizing the external component count due to its adoption of peak current mode control. VIN 2 7 GND The AP64500Q design is optimized for Electromagnetic Interference EXPOSED PAD 9 (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and EN 3 6 COMP turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. The AP64500Q also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of RT/CLK 4 5 FB 6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time. SO-8EP The device is available in an SO-8EP package. Features Applications AEC-Q100 Qualified with the Following Results Automotive Power Systems Device Temperature Grade 1: -40C to +125C T Range Automotive Infotainment A Device HBM ESD Classification Level H2 Automotive Instrument Clusters Device CDM ESD Classification Level C5 Automotive Telematics VIN: 3.8V to 40V Automotive Lighting Control 5A Continuous Output Current Advanced Driver Assistance Systems 0.8V 1% Reference Voltage 25A Low Quiescent Current (Pulse Frequency Modulation) Programmable Switching Frequency: 100kHz to 2.2MHz External Clock Synchronization: 100kHz to 2.2MHz 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 AP64500Q is suitable for automotive applications requiring specific change control this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. AP64500Q Typical Application Circuit INPUT VIN BST C3 L 100nF OUTPUT 4.7H VOUT EN SW 5V C4 R1 OPEN 52.3k AP64500Q C1 C2 FB 2 x 10F 3 x 22F R2 10 k COMP RT/CLK RT R5 200k 15.8k GND C6 39pF C5 (Optional) 2.7nF Figure 1. Typical Application Circuit VIN = 12V, VOUT = 5V, L = 4.7 H VIN = 12V, VOUT = 3.3V, L = 3.3 H VIN = 24V, VOUT = 5V, L = 4.7 H VIN = 24V, VOUT = 3.3V, L = 3.3 H 100 90 80 70 60 50 40 30 20 10 0 0.001 0.010 0.100 1.000 10.000 IOUT (A) Figure 2. Efficiency vs. Output Current 2 of 26 AP64500Q December 2020 Diodes Incorporated www.diodes.com Document number: DS42748 Rev. 1 - 2 Efficiency (%)