AP68255Q_V01 DIODES | Alldatasheet
Document overview
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Technical content
diodes.com Announcement New Product The DIODES Advantage The AP68255Q, AP68355Q, AP6A255Q, and AP6A355Q provide high-efficiency DC-DC conversion for automotive 48V rail point-of-load (PoL) applications. The AP68255Q, AP68355Q, AP6A255Q, and AP6A355Q are high-voltage, internally compensated, DC-DC buck converters with a default switching frequency of 300kHz. They utilize constant on-time (COT) control to achieve fast transient response, easy loop stabilization, and low output voltage ripple, all of which minimizes the external component count. An integrated 500mΩ high-side power MOSFET provides high- efficiency step-down conversion. The AP68255Q, AP68355Q, AP6A255Q, and AP6A355Q designs have been optimized for electromagnetic interference (EMI) reduction. Each device has a proprietary gate-driver scheme to improve switching node ringing, which reduces high- frequency radiated EMI noise caused by MOSFET switching. It does this without sacrificing the turn-on and turn-off times of the N-MOSFET switch. The devices have been qualified to AEC- Q100 Grade 1, operating across the -40ºC to +125ºC ambient temperature range, and are available in the thermally enhanced SO- 8EP package. Standard-compliance versions—AP68255, AP68355, AP6A255, and AP6A355—are available and suitable for industrial and commercial applications. Automotive compliant – AEC qualified, manufactured in facilities certified to IATF 16949 supporting PPAP documents. The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries. © 2025 Copyright Diodes Incorporated. All Rights Reserved. 80V/100V, 2.5A/3.5A, Asynchronous Buck Converters Deliver High Efficiency in Automotive Point-of-Load Applications AP68255Q/355Q AP6A255Q/355Q ▪ Wide 5.5V to 80V/100V Input Voltage Range Operates across the full automotive battery voltage range, including load dump and 48V ▪ Continuous Output Currents up to 3.5A Supports low input voltage and high output-current operating conditions, including ultra-low IQ operation for high light-load efficiency ▪ Built-in Overcurrent Protection (OCP) with Frequency Foldback Ensures high load-current support while reducing junction temperature under fault conditions ▪ Industry-Standard Low Thermal Impedance SO-8EP Package Reduces junction temperature rise
Applications
Automotive PoL conversion in: ▪ Body control electronics ▪ Infotainment ▪ Instrument clusters ▪ 48V motor control ▪ Telematics ▪ Interior and exterior lighting ▪ Advanced driver assistance systems (ADAS) August 2025
diodes.com Typical Application Circuit Orderable Part Number Compliance (Only Automotive Supports PPAP) Package Code Package Moisture Sensitivity Packing Quantity Carrier AP68255QSP-13 Automotive SP SO-8EP MSL-1 4,000 13” Tape & Reel AP68355QSP-13 Automotive SP SO-8EP MSL-1 4,000 13” Tape & Reel AP6A255QSP-13 Automotive SP SO-8EP MSL-1 4,000 13” Tape & Reel AP6A355QSP-13 Automotive SP SO-8EP MSL-1 4,000 13” Tape & Reel August 2025 Part Number VIN Range VOUT Range Output Current HS RDS(ON) fSW IQ Ambient Temperature Package V V A mΩ kHz µA C AP68255Q 5.5 to 80 1.2 to 50 2.5 500 300 140 -40 to +125 SO-8EP AP68355Q 5.5 to 80 1.2 to 50 3.5 500 300 140 -40 to +125 SO-8EP AP6A255Q 5.5 to 100 1.2 to 50 2.5 500 300 140 -40 to +125 SO-8EP AP6A355Q 5.5 to 100 1.2 to 50 3.5 500 300 140 -40 to +125 SO-8EP 80V/100V Automotive-Compliant Buck Converter Portfolio AP68255Q/355Q AP6A255Q/355Q