Diodes Inc. AP1509-33SG-13 Buck Converter, 3.3V 2A Fixed, SOIC-8

The Diodes Inc. AP1509-33SG-13 is a high-performance, monolithic Pulse Width Modulation (PWM) buck (step-down) DC/DC converter integrated circuit. Designed for efficiency and space-saving, it is capable of driving a substantial 2A load directly without requiring an external power transistor, simplifying your design and reducing overall component count on the PCB.

Operating at a fixed switching frequency of 150 kHz, this regulator allows for the use of smaller, more cost-effective filter components compared to lower-frequency alternatives. Its internal compensation network ensures excellent line and load regulation, eliminating the need for complex external feedback loop design and further saving valuable board space.

Key Features and Protections

The AP1509-33SG-13 incorporates robust protection features to ensure reliable operation. These include thermal shutdown to prevent damage from excessive operating temperatures and current limit protection to safeguard the output switch during over-current conditions. An external shutdown control pin allows the device to be placed into a low-power standby mode via a logic-level signal, enhancing power management capabilities.

With an input voltage range from 4.5V to 22V, it offers broad compatibility for various power sources. The fixed output voltage is tightly regulated to 3.3V with a guaranteed ±4% tolerance under specified conditions. The converter utilises voltage mode, non-synchronous PWM control for stable performance.

Applications

This IC is ideally suited for a wide range of power management applications where efficient step-down voltage conversion is required from a higher input supply. Its compact SOIC-8 surface-mount package makes it an excellent choice for space-constrained designs in consumer electronics, embedded systems, and industrial controls.

Important Handling Note: This device is electrostatic discharge (ESD) Sens