Diodes公司的AP72200是大電流同步DC/DC升降壓轉換器,具有高效率,極好的瞬態響應和大DC輸出精度.它采用四開關H橋配置,支持降壓和升壓工作,升/降壓提供大于2A的輸出電流.AP72200具有I2C兼容兩線串行接口,包括雙向串行數據線,SDA和串行時鐘線,SCL.支持SCL時鐘速率高達3.4MHz;此外,還具有UVLO,OTP和OCP保護電路.輸入電壓VIN從2.3V到5.5V,輸出電壓從2.6V-5.14V,連續輸出電流2A,當VOUT=3.4V和 VIN>2.9V時效率高達97%.主要用在智能手機,平板電腦和其它手持設備.本文介紹了AP72200主要特性,功能框圖,典型應用以及評估板AP72200-EVM主要特性,電路圖,材料清單和PCB設計圖.

The AP72200 is a high-current synchronous buck-boost converter providing high efficiency, excellent transient response, and high DC output accuracy. The targeted applications are smartphones, tablets, and other handheld devices. The AP72200 utilizes a four-switch H-bridge configuration to support buck and boost operation. The buck-boost provides at least 2A output current.

The current control scheme handles wide input/output voltage ratios and provides low external component count with outstanding performance in line/load transient response and seamless transition between buck and boost modes.

The AP72200 features I2C compatible, two-wire serial interface consisting of a bidirectional serial-data line, SDA, and a serial-clock line, SCL. It supports SCL clock rates up to 3.4MHz.

The AP72200 also features UVLO, OTP, and OCP to protect the circuit.
This IC is available in a small 2.125mm × 1.750mm, 20 balls WLCSP package.

AP72200主要特性:

? VIN 2.3V to 5.5V
? Output Voltage Range: 2.6V to 5.14V
? 2A Continuous Output Current for VOUT=3.4V and VIN>2.9V Efficiency Up to 97%
? 2.5MHz Switching Frequency
? I2C Interface
? Selectable MODE PFM/PWM
? Ultrasonic Operation Programmable through I2C
? Power Good Indicator with 5MΩ Internal Pull-Up
? Adjustable Overcurrent Limit
? Fully Protected for Overcurrent, Short Circuit, Reverse Current Protection, Overtemperature, and UVLO
? Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
? Halogen and Antimony Free. “Green” Device (Note 3)

AP72200應用:

? Smartphones
? Tablets
? Portable Consumer Devices

圖1.AP72200框圖

圖2. AP72200典型應用

評估板AP72200-EVM

The AP72200 is a high current synchronous buck-boost converter providing high efficiency, excellent transient response and high DC output accuracy. The targeted applications are smartphones, tablets, and other handheld devices. The AP72200 utilizes a four switches H-bridge configuration to support buck and boost operation. The buck-boost provides at least 2A output current.
The current control scheme handles wide input/output voltage ratios and provides low external component count with outstanding performance in line/load transient response and seamless transition between buck and boost modes.

The AP72200 features I2C compatible, 2-wires serial interface consisting of a bidirectional serial-data line, SDA, and a serial-clock line, SCL. It supports SCL clock rates up to 3.4MHz.

The AP72200 also features UVLO, OTP, and OCP to protect the circuit.
This IC is available in a small 2.125x1.750mm, 20 balls WLCSP package

評估板AP72200-EVM主要特性:

? VIN 2.3V to 5.5V
? Output Voltage range: 2.6V to 5.14V
? 2A Continuous Output Current for VOUT=3.4V and VIN > 2.9V Efficiency Up to 97%
? 2.5MHz Switching Frequency
? I2C Interface
? Selectable MODE PFM/PWM
? Ultrasonic Operation Programmable through I2C
? Power Good Indicator with 5M Internal Pull-up
? Adjustable Overcurrent Limit
? Full Protected for Overcurrent,Short Circuit,Reverse Current Protection, Over Temperature, and UVLO
? Totally Lead-Free & Fully RoHS Compliant
? Halogen and Antimony Free. “Green” Device

應用:

? Smartphones
? Tablets
? Portable Consumer Devices

圖3.評估板AP72200-EVM外形圖

圖4.評估板AP72200-EVM電路圖
評估板AP72200-EVM材料清單:

圖5.評估板AP72200-EVM PCB設計圖:頂層

圖6.評估板AP72200-EVM PCB設計圖:底