XR77129 RoHS兼容,无铅认证,“绿色”无卤,44-引脚 TQFN封装。

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  • 四通道降压型控制器
    • 数字PWM,开关频率105kHz-1.23MHz
    • 每通道开关频率单独可调
    • 带有Ultrasonic模式的DPFM专利技术
    • 过采样反馈控制专利
  • XRP7724 引脚兼容,兼具更多特性
    • 额外GPIO可配置
    • 可配置限流告警
    • 异常故障告警
    • 输出电压精度更高
  • 6V至40V输入电压范围
  • 0.6V至5.5V输出电压范围
  • 兼容SMBus的-I²C接口
    • 完善的电源监测和报告功能
  • 3 X15V PSIO +2 x GPIOs
  • 支持上电/断电时序可调
  • 内置过温,过流,UVLO和输出过压保护
  • 片内5V和3.3V备用LDOs
  • 片内非易失性内存
  • PowerArchitect™ 5 配套设计和配置软件,支持高输出电压时使用分压电阻


  • 车载娱乐设备
  • 工业控制系统
  • 视听系统
  • 自动测试设备
  • 视频监控系统

Design Tools

Symbols & Footprints
Evaluation Hardware and Software


Pkg Code Details Quantities Dimensions PDF
TQFN44 7x7
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 30.2ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 260
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: 260
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 12
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 7.00
  • Width: 7.00
  • Thickness: 0.8
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR77129ELB-F TQFN44 7x7 Active
XR77129EVB-DEMO-1 Board Active
XR77129EVB-DEMO-1-KITA Kit Active
XR77XXEVB-XCM-62 Board Active
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Quality Documents

Part NumberReL
Additional Quality Documentation may be available, please contact customersupport@exar.com.
Distribution Date Description File
07/04/2018 Product Discontinuation Notice PDN 18-0624-01-1033.pdf
07/21/2017 Qualification of alternate assembly subcon, ANST. PCN 17-0626-01 ANST-1033.pdf
07/11/2017 Product Discontinuation Notification PDN_17-0623-01-1033.pdf

Frequently Asked Questions

Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:


Find the icons under Buy Now or Order Samples:


Click on the Buy Now icon and see who has stock and click on the Buy button:


Alternatively, you can click on the Order Samples


If the icons are missing, then contact Customer Support.

The best way to determine this is to go to exar.com and type the part into the search function. At or near the top of the results you should see something that looks like

In this example, we looked for XRA1201. When you hover over it, it will turn grey and you can click anywhere in the grey box. This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted in yellow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link:


A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers:


Another method to find out if a part is OBS or EOL is to click on SUPPORT:


And then Product Change Notifications


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

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