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ADP1828:  Synchronous Buck PWM, Step-Down, DC-to-DC Controller

Product Details

Newer Alternatives: NEW DESIGNS:
ADP1853 Synchronous, Step-Down DC-to-DC Controller with Voltage Tracking and Synchronization

The ADP1828 is a versatile and synchronous PWM voltage mode buck controller. It drives an all N-channel power stage to regulate an output voltage as low as 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The ADP1828 is ideal for a wide range of high power applications, such as DSP and processor core I/O power, and general-purpose power in telecommunications, medical imaging, PC, gaming, and industrial applications. It operates from input bias voltages of 3 V to 20 V with an internal LDO that generates a 5 V output for input bias voltages greater than 5.5 V.

The ADP1828 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, or at any frequency between 300 kHz and 600 kHz with a resistor. The switching frequency can also be synchronized to an external clock up to 2× the part’s nominal oscillator frequency. The clock output can be used for synchronizing additional ADP1828s (or the ADP1829 controllers), thus eliminating the need for an external clock source. The ADP1828 includes soft start protection to limit any inrush current from the input supply during startup, reverse current protection during soft start for a precharged output, as well as a unique adjustable lossless current-limit scheme utilizing external MOSFET RDSONsensing.

For applications requiring power-supply sequencing, the ADP1828 provides a tracking input that allows the output voltage to track during startup, shutdown, and faults. The additional supervisory and control features include thermal overload, undervoltage lockout, and power good.

The ADP1828 operates over the −40°C to +125°C junction temperature range and is available in a 20-lead QSOP.


  • Telecom and networking systems
  • Base station power
  • Set-top boxes, game consoles
  • Printers and copiers
  • Medical imaging systems
  • DSP and microprocessor core power supplies
  • DDR termination


  • Wide bias voltage range 3.0 V to 20 V
  • Wide power stage input range 1 V to 24 V
  • Wide output voltage range: 0.6 V to 85% of input voltage
  • ±0.85% accuracy at 0°C to 70°C
  • All N-channel MOSFET design for low cost
  • Fixed-frequency operation at 300 kHz, 600 kHz, or resistor adjustable 300 kHz to 600 kHz
  • Clock output for synchronizing other controllers
  • No current sense resistor required
  • Internal linear regulator
  • Voltage tracking for sequencing
  • Soft start and thermal overload protection
  • Overvoltage and undervoltage power-good indicator

Circuit Diagram for ADP1828


Title Content Type File Type
ADP1828: Synchronous Buck PWM, Step-Down, DC-to-DC Controller Data Sheet (Rev C, 12/2010) (pdf, 839 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
ADP1828 Low Voltage DC-DC Switching Power  (pdf, 721 kB)
Input Voltage Range: 10.8 V – 13.2 V; Output Voltage: 2.5 V; Output Current: 4 A; Single sided 1” x1” PCB
Power Reference Designs PDF
ADP1828 Vin 2.25-2.75 Vout 1V @ 12 A  (pdf, 133 kB)
Input Voltage Range: 2.25 V – 2.75 V; Output Voltage: 1 V; Output Current: 12 A; Ripple 20 mV ppk; Transient step ±5%, 50% max load
Power Reference Designs PDF
ADP1828 Three Output Voltages  (pdf, 216 kB)
Three Output Voltages: 3.3 V, 2.5 V, 1.25 V; Output Current: 2.2 A, 3.9 A, 12.7 A; Input Voltage Range: 10.8 V – 13.2 V; Ripple 1-2% ppk of Output Voltage; Transient step ±3%, 25% max load
Power Reference Designs PDF
Industrial ICs
Industrial ICs Solutions Bulletin, Volume 10, Issue 8
Solutions Bulletins HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP182x 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

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Price, packaging, availability

ADP1828 Model Options
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.

ADP1828 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADP1828HC-EVALZ Status: Production Evaluation Board $80.96 Yes -
ADP1828LC-EVALZ Status: Production Evaluation Board $80.96 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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