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ADP1878:  Synchronous Buck Controller with Constant On-Time and Valley Current Mode

Product Details

Product Status:Recommended for New Designs

The ADP1878/ADP1879 are versatile current mode, synchronous step-down controllers. They provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo fixed frequency with a programmable current limit, current control scheme. In addition, these devices offer optimum performance at low duty cycles by using a valley, current mode control architecture. This allows the ADP1878/ADP1879 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V.

The ADP1879 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 ADP1879 Power Saving Mode (PSM) section for more information).

Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1878/ADP1879 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 low dropout regulator (LDO).

In addition, soft start, programmability is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during precharged output conditions. 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 ADP1878/ADP1879 operate over the −40°C to +125°C junction temperature range and are available in a 14-Lead LFCSP_WD package.

APPLICATIONS

  • Telecom and networking systems
  • Mid to high-end servers
  • Set-top boxes
  • DSP core power supplies

FEATURES and BENEFITS

  • 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 (ADP1879 only)
  • Resistor programmable current limit
  • Power good with internal pull-up resistor
  • Externally programmable soft-start
  • See data sheet for additional features

Functional Block Diagram for ADP1878

Documentation

Title Content Type File Type
ADP1878/ADP1879: Synchronous Buck Controller with Constant On Time and Valley Current Mode Data Sheet (Rev B, 09/2012) (pdf, 1869 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
ADIsimPower™ Voltage Regulator Design Tool
This expert design tool produces custom DC-DC converter designs in about a minute. The user enters 5 inputs and chooses to optimize for efficiency, PCB space, cost, or part count. Output is a complete schematic, BOM, efficiency plot, and performance summary. A PDF summary and a blank PCB is offered for each design to facilitate fast prototyping to verify the design.
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.

SampleSample & Buy

Price, packaging, availability

ADP1878 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP1878ACPZ-0.3-R7 Status: Production LFCSP:LEADFRM CHIP SCALE 14 Ind Reel, 1500 - $1.28 Y  Material Info PCN Purchase Sample
ADP1878ACPZ-0.6-R7 Status: Production LFCSP:LEADFRM CHIP SCALE 14 Ind Reel, 1500 - $1.28 Y  Material Info PCN Purchase Sample
ADP1878ACPZ-1.0-R7 Status: Production LFCSP:LEADFRM CHIP SCALE 14 Ind Reel, 1500 - $1.28 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.

ADP1878 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP1878-0.3-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP1878-0.6-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP1878-1.0-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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