AP1509 PWM DC-DC Converter: Pinout, Equivalent and Datasheet

The following figure is the diagram of AP1509 Pinout.

Pinout

Pin Descriptions

The followings are AP1509 Symbol, Footprint, and 3D Model.

PCB Symbol

PCB Footprint

3D Model

The AP1509 series are monolithic ICs designed for a step-down DC-DC converter and have the ability of driving a 2A load without an additional transistor, which saves board space. The external shutdown function can be controlled by logic level and then go into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown prevents overtemperature operating from damage, and current limit works against overcurrent operating of the output switch. If current limit function occurs, and V_FB is below 0.5V, the switching frequency is reduced. The AP1509 series operates at a switching frequency of 150kHz thus allowing smaller-sized filter components than what is required with lower frequency switching regulators. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard 8-lead SO-8 package.

This article will introduce AP1509 systematically from its features, pinout to its specifications, applications, also including AP1509 datasheet and so much more.

● Output Voltage: 3.3V, 5V, 12V, and Adjustable Output Version

● Adjustable Version Output Voltage Range of 1.23V to 18V+4%

● 150kHz +15% Fixed Switching Frequency

● Voltage Mode Non-Synchronous PWM Control

● Thermal-Shutdown and Current-Limit Protection

● ON/OFF Shutdown Control Input

● Operating Voltage up to 22V

● Output Load Current: 2A

● Low Power Standby Mode

● Built-in Switching Transistor On Chip

● Totally Lead-Free & Fully RoHS Compliant

● Halogen and Antimony Free. “Green” Device

● For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities)

The following is the Functional Block Diagram of AP1509.

Functional Block Diagram

● Simple High-Efficiency Step-Down Regulator

● On-Card Switching Regulators

● Positive to Negative Converter

The following is the Package Marking Information of AP1509.

Marking Information

The following diagram shows the AP1509 Package Suggested Pad Layout.

Suggested Pad Layout

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