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ADP1864:  Constant Frequency Current-Mode Step-Down DC-to-DC Controller in TSOT

Product Details


The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±2% accuracy, for up to 5 A load currents, from input voltages as high as 14 V.

The ADP1864 provides system flexibility by allowing accurate setting of the current limit with an external resistor, and the output voltage is easily adjustable using two external resistors. The ADP1864 includes an internal soft start to allow quick power-up while preventing input inrush current. Additional safety features include short-circuit protection, output overvoltage protection, and input undervoltage protection. Current-mode control provides fast and stable load transient performance, while the 580 kHz operating frequency allows a small inductor to be used in the system. To further the life of a battery source, the controller turns on the external P-channel MOSFET 100% of the duty cycle during dropout.

The ADP1864 operates over the −40°C to +125°C temperature range and is available in a small, low profile, 6-lead TSOT package.

Applications

  • Wireless devices
  • 1- to 3-cell Li-Ion battery-powered applications
  • Set-top boxes
  • Processor core power supplies
  • Hard disk drives

FEATURES and BENEFITS

  • Wide input voltage range: 3.15 V to 14 V
  • Wide output voltage range: 0.8 V to input voltage
  • Pin-to-pin compatible with LTC1772, LTC3801
  • Up to 94% efficiency
  • 0.8 V ± 1.25% reference accuracy over temperature
  • Internal soft start
  • 100% duty cycle for low dropout voltage
  • Current-mode operation for good line and load transient response
  • 7 μA shutdown current
  • 235 μA quiescent supply current
  • Short-circuit and overvoltage protection
  • Small 6-lead TSOT package

Typical Application Circuit Diagram for ADP1864

Documentation

Title Content Type File Type
ADP1864: Constant Frequency Current-Mode Step-Down DC-to-DC Controller in TSOT Data Sheet (Rev C, 08/2012) (pdf, 314 kB) Data Sheets PDF
CN-0190: Robust, Multivoltage, High Efficiency, 25 W Universal Power Supply Module with 6 V to 14 V Input  (pdf, 357 kB) Circuit Note 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
ADP1864 & ADP1611 Reference Design  (pdf, 123 kB)
Input Voltage 5V ± 5%; Generates two voltages: An adjustable negative voltage that tracks an adjustable positive voltage; Output Voltage: -7V to -12V and +7 to +12V; Single resistor value change for each supply will adjust the output voltages; Both Voltages capable of providing 150mA of output current
Power Reference Designs PDF
ADP1829 & ADP1864 Reference Design  (pdf, 142 kB)
Three Output Voltages: 1.24 V, 3.3 V, 5 V; Output Current: 2 A to 4 A; Input voltage: 10.8-13.2 V; Ripple 2% ppk of Output Voltage; Transient step ±5%, 50% max load
Power Reference Designs PDF
DC-to-DC Switching Regulator IC Solutions (10/06)  (pdf, 3205 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP1864 Buck Controller Design 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

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Price, packaging, availability

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.

ezLINX™ iCoupler® Isolated Interface Development Environment
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EZLINX-IIIDE-EBZ Status: Production iCoupler® Isolated Interface Development Environment Evaluation Board $149.00 Yes -
ADP1864 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
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ADP1864-EVALZ Status: Production Evaluation Board $60.72 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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