AP62300 Synchronous Buck Converter IC: Features, Applications & Specifications

The AP62300 is a high-efficiency synchronous buck (step-down) DC-DC converter designed for space-constrained and power-efficient electronic systems. Manufactured by Diodes Incorporated, the AP62300 integrates power MOSFETs, control circuitry, and protection features into a compact package, making it ideal for embedded systems, consumer electronics, and industrial applications.

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What is AP62300?

The AP62300 is a monolithic synchronous step-down regulator capable of delivering high output current with excellent efficiency. It is optimized for low-voltage power rails commonly required by microcontrollers, SoCs, sensors, and communication modules.

With its wide input voltage range and fixed switching frequency, the AP62300 simplifies PCB design while ensuring stable performance across varying load conditions.

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Key Features of AP62300

✅ High Efficiency Synchronous Buck Topology

• Integrated high-side and low-side MOSFETs
• Efficiency exceeding 90% under typical conditions

✅ Wide Input Voltage Range

• Supports inputs up to 18 V
• Suitable for 5 V, 12 V, and battery-powered systems

✅ High Output Current Capability

• Delivers up to 3 A continuous output current
• Ideal for powering digital ICs and peripherals

✅ Fixed Switching Frequency

• Simplifies EMI filtering and layout design
• Stable operation across load range

✅ Low Quiescent Current

• Improves standby power efficiency
• Ideal for always-on embedded devices

✅ Built-in Protection Features

• Over-current protection (OCP)
• Thermal shutdown
• Under-voltage lockout (UVLO)
• Short-circuit protection

✅ Compact Package

• Available in QFN / TSOT packages
• Minimizes PCB footprint

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Applications of AP62300

The AP62300 is widely used in modern low-power and embedded systems, including:

1. Microcontroller Power Supplies

• Power rails for MCU, DSP, and SoC devices
• 1.2 V, 1.8 V, 3.3 V conversion

2. Communication Modules

• Wi-Fi, Bluetooth, Zigbee, and LoRa modules

3. Consumer Electronics

• Set-top boxes
• Smart displays
• IoT gateways

4. Industrial Electronics

• Sensors and actuators
• PLC sub-modules
• Control boards

5. Battery-Powered Devices

• Portable instruments
• Embedded battery-powered systems

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Electrical Specifications (Typical)

Parameter	Specification
Regulator Type	Synchronous Buck Converter
Input Voltage Range	4.5 V – 18 V
Output Voltage Range	Adjustable (≈0.8 V to VIN)
Maximum Output Current	3 A
Switching Frequency	Fixed (≈1.2 MHz)
Efficiency	Up to 95%
Quiescent Current	Low (µA range)
Protection	OCP, SCP, OTP, UVLO
Operating Temperature	−40 °C to +85 °C
Package Options	QFN / TSOT

⚠️ Actual limits depend on operating conditions and variant. Always consult the official AP62300 datasheet.

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Typical Pin Description

• VIN – Input supply voltage
• VOUT / SW – Switching node to inductor
• FB – Feedback pin for output voltage regulation
• EN – Enable / disable control
• GND – Ground reference

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Advantages of AP62300

• High power density design
• Minimal external components
• Low EMI and stable operation
• Integrated MOSFETs reduce BOM
• Reliable protection for harsh conditions

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AP62300 vs Linear Regulators

Unlike linear regulators (LDOs), the AP62300:

• Offers much higher efficiency
• Generates less heat
• Supports higher output current
• Is better suited for battery and high-load systems

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Final Summary

The AP62300 is a compact and efficient 3 A synchronous buck converter IC that provides reliable voltage regulation for modern embedded and industrial applications. With integrated MOSFETs, strong protection features, and high efficiency, it is an excellent choice for designers seeking small size, high performance, and low power loss.