ADP1823:  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 ...More

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

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

Product Description

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

    • Data Sheet, Rev. D, 10/07

    Features

    • 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

    Diagrams

    ADP1823 Diagram
    Typical Application Circuit for ADP1823

    Specifications

    Vin Range 3.7V-20V
    Vout Adj
    Step Up No
    Shutdown Y
    Pkg LFCSP-32

    Explore Other Products

    Part# Vin Range Pwr Stage Vin Vout Adj Options Multi-Output Shutdown Current Supply Current Switching Frequency Iout (max) Synchronous Step Down Step Up Pkg Product Description Price* (1000-4999)
    ADP1621 2.9V-5.5V As Low As 1V Lossless ISens@<30V Vout, Resistor ISens@>30V No 10µA 3mA 100 KHz - 1.5 MHz - No No Yes MSOP-10 Constant-Frequency, Current-Mode, Step-Up DC/DC Controller $1.32
    ADP1821 3.7V-5.5V 1V-24V 0.6V to 85% PwrStgVin No 10µA 2mA 300 kHz -600 kHz, Sync up to 1 MHz 20A Yes Yes No QSOP-16 20 A Step-Down DC-DC Controller $1.37
    ADP1822 3.7V-5.5V 1V-24V 0.6V to 85% PwrStgVin No 10µA 2mA 300 kHz-600 kHz; Sync up to 1 MHz 20A Yes Yes No QSOP-24 20 A, PWM, Step-Down DC-DC Controller with Margining and Tracking $1.42
    ADP1823 3.7V-20V 1V-24V 0.6V to 85% PwrStgVin Yes 20µA 3mA 300 kHz-600 kHz, Sync up to 1 MHz 20A Yes Yes No LFCSP-32 Versatile Dual, Interleaved Synchronous PWM Buck Controller w/ Tracking $2.13
    ADP1828 3.0V-18V 1V-24V 0.6V to 85% PwrStgVin No 15µA 3mA 300 kHz to 600 kHz - Yes Yes No QSOP-20 Synchronous Buck PWM, Step-Down, DC-to-DC Controller $1.52
    ADP1829 3.0V-18V 1V-24V 0.6V to 85% PwrStgVin Yes 20µA 3mA 300 kHz-600 kHz, Sync up to 1 MHz 20A Yes Yes - LFCSP-32 Dual, Interleaved, Step-Down DC-to-DC Controller w/ Tracking $2.13
    ADP1864 3.15V-14V 3.15V-14V 0.8V to Vin No 15µA 350µA 580 kHz 5A No Yes No TSOT-6 5A, Constant Frequency, Current-Mode Step-Down DC/DC Controller in TSOT $1.06

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

    Pricing, Packaging & Availability

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    • Automotive: -40 to +125 degrees Celsius
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    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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