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ADP1823:  Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking

Product Details


Newer Alternatives: NEW DESIGNS:
- ADP1850 Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller
- ADP1829 Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking

The ADP1823 is a versatile, dual, interleaved, synchronous, PWM buck controller that generates two independent output rails from an input of 3.7 V to 20 V, with a power input voltage that ranges from 1 V to 24 V. Each controller can be configured to provide output voltages from 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The two channels operate 180° out of phase, reducing stress on the input capacitor and allowing smaller, low cost components. The ADP1823 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, PCs, gaming, and industrial applications.

The ADP1823 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, minimizing external component size and cost. For noise sensitive applications, it can also be synchronized to an external clock to achieve switching frequencies between 300 kHz and 1 MHz. The ADP1823 includes soft start protection to prevent inrush current from the input supply during startup, reverse current protection during soft start for precharged outputs, as well as a unique adjustable lossless current-limit scheme using external MOSFET sensing.

For applications requiring power supply sequencing, the ADP1823 also provides tracking inputs that allow the output voltages to track during startup, shutdown, and faults. This feature can also be used to implement DDR memory bus termination.

The ADP1823 is specified over the −40°C to +125°C junction temperature range and is available in a 32-lead LFCSP.

Applications

  • Telecommunications and networking systems
  • Medical imaging systems
  • Base station power
  • Set-top boxes
  • Printers
  • DDR termination

FEATURES and BENEFITS

  • Fixed-frequency operation: 300 kHz, 600 kHz, or synchronized operation up to 1 MHz
  • Supply input range: 3.7 V to 20 V
  • Wide power stage input range: 1 V to 24 V
  • Interleaved operation results in smaller, low cost input capacitor
  • All-N-channel MOSFET design for low cost
  • ±0.85% accuracy at 0°C to 70°C
  • Soft start, thermal overload, current-limit protection
  • 10 μA shutdown supply current
  • Internal linear regulator
  • Lossless RDSON current-limit sensing
  • Reverse current protection during soft start for handling precharged outputs
  • Independent Power OK (POK) outputs

Functional Block Diagram for ADP1823

Of Note ...

This product is not recommended for new designs. The ADP1829 is the recommended replacement.

Documentation

Title Content Type File Type
ADP1823: Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking Data Sheet (Rev D, 10/2007) (pdf, 656 kB) Data Sheets PDF
ADP1823, ADP2106, ADP1821 Reference Design  (pdf, 189 kB)
Six Output Voltages: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5 V, 12 V; Output Current: 1 A to 4.5 A; Input voltage: 14.4-20.0 V; Ripple 2% ppk of Output Voltage; Transient step ±5%, 50% max load
Power Reference Designs PDF
Dual Buck Controller Cuts Bill-of-material Costs by 15 Percent
(EE Times, 6/6/2006)
Product Reviews HTML
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
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
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

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.


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