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ADP1871:  Synchronous Buck Controller with Constant On-Time, Valley Current Mode, and Power Save Mode

产品详情

产品状态:推荐用于新设计

The ADP1870/ADP1871 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo-fixed frequency with a programmable currentlimit, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by utilizing valley current-mode control architecture. This allows the ADP1870/ ADP1871 to drive all N-channel power stages to regulate output voltages as low as 0.6 V.

The ADP1871 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1871) section for more information).

Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1870/ADP1871 are well suited for a wide range of applications that require a single-input power supply range from 2.95 V to 20 V. Low voltage biasing is supplied via a 5 V internal LDO.

In addition, an internally fixed soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a precharged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulsewidth modulation (PWM) option, reduce the external part count and improve efficiency.

The ADP1870/ADP1871 operate over the -40°C to +125°C junction temperature range and are available in 10-lead MSOP package.

特点和优势

  • Power input voltage range: 2.95 V to 20 V
  • On-board bias regulator
  • Minimum output voltage: 0.6 V
  • 0.6 V reference voltage with ±1.0% accuracy
  • Supports all N-channel MOSFET power stages
  • Available in 300 kHz, 600 KHz, and 1.0 MHz options
  • No current-sense resistor required
  • Power saving mode (PSM) for light loads
  • Resistor-programmable current-sense gain
  • Thermal overload protection
  • Short-circuit protection
  • Precision enable input
  • Integrated bootstrap diode for high-side drive
  • Starts into a precharged load
  • Small, 10-lead MSOP package

文档

快讯名称 内容类型 文件类型
ADP1870/ADP1871:具有恒定导通时间和谷值电流模式的同步降压控制器 数据手册 (Rev B, 07/2012) (pdf, 0) 产品数据手册 PDF
ADP1870/ADP1871: Synchronous Buck Controller with Constant On-Time and Valley Current Mode Data Sheet (Rev B, 07/2012) (pdf, 1861 kB) 产品数据手册 PDF
Introduction to ADIsimPower
ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
Videos HTML
RAQs index 非常见问题解答 HTML
术语表 专业词汇表 HTML

设计工具,模型,驱动及软件

快讯名称 内容类型 文件类型
ADP187x Buck Designer Tool  (zip, 0)
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
ADIsim Design/Simulation Tools ZIP
Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
ADIsim Design/Simulation Tools HTML

输入参数值,然后点击ADIsimPower查找电源管理解决方案。 Launch of ADIsimPower Voltage Regulator Design Tool
可用系统电压 工作电压轨 负载电流
Vin (最小值) V Vin (最大值) V Vout V Iout A

评估套件,原理图符号和PCB封装

评估板和开发套件查看评估板和套件页面以了解文档和采购信息

原理图符号和PCB封装— ADI公司提供与当今众多CAD系统兼容的原理图符号和PCB封装(Symbols & Footprints),以便更广泛、更轻松地使用。

Sample样片申请及购买

价格,封装及供货状态

ADP1871 型号选项
产品型号 封装 引脚 温度范围 包装和数量 报价*(100-499) 报价*1000 pcs RoHS 查看PCN/PDN 查看库存/
购买/样片
ADP1871ACPZ-0.3-R7 产品状态: 量产 10 ld LFCSP (3x3mm) 10 工业 Reel, 1500 - $ 1.08 Y  材料信息 查看PCN 订购 样片
ADP1871ACPZ-0.6-R7 产品状态: 量产 10 ld LFCSP (3x3mm) 10 工业 Reel, 1500 - $ 1.08 Y  材料信息 查看PCN 订购 样片
ADP1871ACPZ-1.0-R7 产品状态: 量产 10 ld LFCSP (3x3mm) 10 工业 Reel, 1500 - $ 1.08 Y  材料信息 查看PCN 订购 样片
ADP1871ARMZ-0.3-R7 产品状态: 量产 10 ld MSOP 10 工业 Reel, 1000 - $ 1.08 Y  材料信息 查看PCN 订购 样片
ADP1871ARMZ-0.6-R7 产品状态: 量产 10 ld MSOP 10 工业 Reel, 1000 - $ 1.08 Y  材料信息 查看PCN 订购 样片
ADP1871ARMZ-1.0-R7 产品状态: 量产 10 ld MSOP 10 工业 Reel, 1000 - $ 1.08 Y  材料信息 查看PCN 订购 样片
帮助

这里所列出的美国报价单仅供预算参考,指美元报价(规定订量的每片美元,美国离岸价),如有修改不再另行通知。由于地区关税、商业税、汇率及手续费原因,国际报价可能不同。对于特殊批量报价,请与您当地的ADI公司办事处或代理商联络。对于评估板和套件的报价是指一个单位价格。

ADP1871 评估板
产品型号 描述 报价 RoHS 查看PCN/PDN 查看库存/
购买/样片
ADP1871-0.3-EVALZ 产品状态: 量产 Evaluation Board $ 60.00 -
ADP1871-0.6-EVALZ 产品状态: 量产 Evaluation Board $ 60.00 -
ADP1871-1.0-EVALZ 产品状态: 量产 Evaluation Board $ 60.00 -
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