概览

优势和特点

  • 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

产品详情

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.

产品生命周期 icon-recommended 推荐新设计使用

本产品已上市。数据手册包含所有最终性能规格和工作条件。ADI公司推荐新设计使用这些产品。

评估套件 (1)

工具及仿真模型

设计工具

ADP187x Buck Designer Tool

Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.

ADIsimPower™ 稳压器设计工具

这款专家级设计工具只需一分钟左右的时间就能产生定制的DC/DC转换器设计。用户提供5个输入,并选择优化目标:效率、PCB空间、成本或器件数量。输出为完整的原理图、材料清单(BOM)、效率图和性能摘要。这款工具为每个设计提供一份PDF概述文档和一个空白PCB,以帮助用户快速完成原型制作,验证设计目标。

设计资源

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所示报价为单片价格。所列的美国报价单仅供预算参考,指美元报价(每片美国离岸价),如有修改恕不另行通知。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。