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AOZ1051PI from AOS

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AOZ1051PI

Manufacturer: AOS, ALPHA

EZBuck? 3 A Synchronous Buck Regulator

Partnumber Manufacturer Quantity Availability
AOZ1051PI AOS, ALPHA 8932 In Stock

Description and Introduction

EZBuck? 3 A Synchronous Buck Regulator The AOZ1051PI is a DC-DC converter manufactured by Alpha and Omega Semiconductor (AOS). Below are the key specifications from Ic-phoenix technical data files:

1. **Manufacturer**: Alpha and Omega Semiconductor (AOS)  
2. **Part Number**: AOZ1051PI  
3. **Type**: Step-Down (Buck) DC-DC Converter  
4. **Input Voltage Range**: 4.5V to 16V  
5. **Output Voltage Range**: Adjustable from 0.8V to 12V  
6. **Output Current**: Up to 5A  
7. **Switching Frequency**: 500kHz  
8. **Efficiency**: Up to 95%  
9. **Package**: 8-Pin SOIC  
10. **Features**:  
   - Integrated high-side and low-side MOSFETs  
   - Overcurrent and overtemperature protection  
   - Soft-start function  
   - Adjustable output voltage  

This information is based on the manufacturer's datasheet and product documentation.

Application Scenarios & Design Considerations

EZBuck? 3 A Synchronous Buck Regulator# Technical Datasheet: AOZ1051PI - 4.5V to 16V Input, 6A Synchronous Buck Regulator

 Manufacturer:  Alpha and Omega Semiconductor (AOS)
 Document Revision:  1.0
 Date:  October 26, 2023

---

## 1. Application Scenarios

The AOZ1051PI is a high-efficiency, monolithic synchronous buck regulator designed to deliver up to 6A of continuous output current from an input voltage range of 4.5V to 16V. Its integrated features make it a versatile solution for point-of-load (POL) power conversion in space-constrained and thermally challenging environments.

### 1.1 Typical Use Cases

*    Intermediate Bus Conversion:  Primarily employed to step down a 12V nominal intermediate bus voltage (common in computing, networking, and telecom systems) to lower core voltages such as 5.0V, 3.3V, 2.5V, or 1.8V.
*    Single-Stage Power Supply:  Used as the primary DC/DC converter in systems powered by a 5V, 9V, or 12V wall adapter or external power brick, directly generating the required system rail.
*    High-Current, Low-Voltage Rails:  Ideal for powering modern FPGAs, ASICs, DSPs, and memory subsystems that require a stable, high-current supply at sub-1V to 3.3V levels with tight voltage regulation.
*    Distributed Power Architectures:  Serves as a localized regulator on daughter cards or peripheral modules, improving noise isolation and reducing IR drop losses associated with long PCB traces.

### 1.2 Industry Applications

*    Networking & Telecommunications:  Power over Ethernet (PoE) powered devices (PDs), routers, switches, optical network terminals (ONTs), and baseband units. Its input range accommodates the 12V/48V-derived rails common in these systems.
*    Computing & Storage:  Motherboard VRMs for peripheral power, solid-state drives (SSDs), hard disk drives (HDDs), and various add-in cards (NICs, RAID controllers).
*    Industrial Electronics:  PLCs, industrial PCs, test and measurement equipment, and embedded computing modules requiring robust and reliable power from industrial 12V or 24V (derated) supplies.
*    Consumer Electronics:  Set-top boxes, gaming consoles, digital signage, and high-performance audio/video equipment.

### 1.3 Practical Advantages and Limitations

 Advantages: 
*    High Integration:  Incorporates both high-side and low-side MOSFETs (synchronous rectification), reducing external component count, PCB area, and design complexity.
*    High Efficiency:  Utilizes a valley-current control mode (constant-on-time architecture) for fast transient response and high light-load efficiency. Typical peak efficiency exceeds 95%.
*    Compact Solution:  Available in a thermally enhanced 3x3mm QFN-16 package, enabling very dense PCB layouts.
*    Feature-Rich:  Includes comprehensive protection features (UVLO, OCP, OTP, Output OVP) and a Power Good (PG) signal for system sequencing/monitoring.
*    Wide Frequency Range:  Adjustable switching frequency (250kHz to 1.2MHz) allows optimization for size (higher frequency) or efficiency (lower frequency).

 Limitations: 
*    Input Voltage Range:  Maximum 16V input limits its use in applications directly connected to 18V-24V industrial buses without a pre-regulator or careful derating.
*    Current Capability:  The 6A continuous output limit necessitates parallel devices or a different part number for higher current requirements.
*    Thermal Management:  At full load and high ambient temperatures,

Alternative Part Number

  • TPS54231DR --: 2A, 28V synchronous buck converter in SOIC-8 with similar input range and current rating; widely available and pin-compatible in function.
  • MP1584EN --: 3A, 28V step-down converter in SOIC-8, comparable switching regulator for similar applications with good availability.
  • LMR14030SDDAR --: 3A, 40V buck converter in SOIC-8 with integrated switch, higher voltage margin and similar footprint for drop-in functional replacement.
  • AP65550 --: 5A synchronous buck regulator in SOIC-8 with similar electrical characteristics and good supply availability as a functional substitute.

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