AP64350SP-13 – Switching Voltage Regulators Positive Adjustable IC SO-8

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Datasheet
AP64350SP-13 3.5A, 40V Low IQ Synchronous Buck Switching Regulator IC
The AP64350SP-13 is a highly efficient 3.5A synchronous buck DC-DC converter engineered for superior performance, low EMI, and minimal quiescent current. With a wide input voltage range of 3.8V to 40V, this regulator is ideal for industrial, automotive, and communication systems requiring reliable step-down conversion from unregulated power sources. The device integrates high-side (75m) and low-side (45m) power MOSFETs to achieve outstanding efficiency and thermal performance in a compact design. Employing a peak current mode control architecture, the AP64350SP simplifies implementation and minimizes external component requirements. It features programmable switching frequency and external clock synchronization from 100kHz to 2.2MHz, offering flexibility to optimize system efficiency or component size. To further reduce electromagnetic interference (EMI), the AP64350SP incorporates a proprietary gate driver scheme that suppresses switching node ringing and Frequency Spread Spectrum (FSS) with +-6% jitter, effectively dispersing switching energy across a wider frequency band. The regulator achieves exceptional light-load efficiency with its 22uA quiescent current (PFM mode) and supports a Low-Dropout (LDO) mode for near 100% duty cycle operation. Comprehensive protection circuitryincluding undervoltage lockout (UVLO), output overvoltage protection (OVP), cycle-by-cycle current limit, and thermal shutdownensures robust and reliable system performance. Packaged in a thermally enhanced SO-8EP, the AP64350SP-13 delivers excellent EMI performance, compact design, and reliable operation under all conditions.
Key Features

Wide Input Voltage Range: 3.8V to 40V suitable for industrial and automotive systems.
High Output Current: Provides up to 3.5A continuous current with superior conversion efficiency.
Integrated Power MOSFETs: 75mohm high-side and 45mohm low-side MOSFETs reduce conduction losses.
Low Quiescent Current: 22uA in PFM mode for enhanced battery efficiency.
Programmable Switching Frequency: Adjustable between 100kHz and 2.2MHz for flexibility in design optimization.
External Clock Synchronization: Enables synchronization to external systems for EMI control.
Proprietary Gate Driver Design: Minimizes switching node ringing for low radiated EMI noise.
Frequency Spread Spectrum (FSS): +-6% frequency jitter helps reduce overall EMI emissions.
Low-Dropout (LDO) Mode: Supports near 100% duty cycle operation for stable low-voltage outputs.
Comprehensive Protection: Includes UVLO, OVP, cycle-by-cycle current limit, and thermal shutdown.
Precision Enable Threshold: Allows fine adjustment of UVLO levels for system reliability.
Compact SO-8EP Package: Provides excellent heat dissipation and simplified PCB layout.