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

Product Details

Product Status:Recommended for New Designs

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.

FEATURES and BENEFITS

  • Chinese data sheet available
  • 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

Documentation

Title Content Type File Type
ADP1870/ADP1871: Synchronous Buck Controller with Constant On-Time and Valley Current Mode Data Sheet (Rev B, 07/2012) (pdf, 1861 kB) Data Sheets 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 Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
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
Launch of ADIsimPower Voltage Regulator Selection Vin (min) V Vout V   Find Solutions
Vin (max) V Iout A

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

ADP1871 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP1871ACPZ-0.3-R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.08 Y  Material Info PCN Purchase Sample
ADP1871ACPZ-0.6-R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.08 Y  Material Info PCN Purchase Sample
ADP1871ACPZ-1.0-R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.08 Y  Material Info PCN Purchase Sample
ADP1871ARMZ-0.3-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.08 Y  Material Info PCN Purchase Sample
ADP1871ARMZ-0.6-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.08 Y  Material Info PCN Purchase Sample
ADP1871ARMZ-1.0-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.08 Y  Material Info PCN Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADP1871 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP1871-0.3-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP1871-0.6-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP1871-1.0-EVALZ Status: Production Evaluation Board $60.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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