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.
Data Sheet, Rev. D, 10/07
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|ADP1823: Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking Data Sheet (Rev D, 10/2007) (pdf, 656 kB)||Data Sheets|
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|
Dual Buck Controller Cuts Bill-of-material Costs by 15 Percent
(EE Times, 6/6/2006)
|DC-to-DC Switching Regulator IC Solutions (10/06) (pdf, 3205 kB)||Overview|
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
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Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
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Blank/Unpopulated boards need to be ordered through the appropriate download tool from ADIsimPower.
ADP1823 Evaluation Board for Constant-Frequency, Current-Mode, Step-Up, DC/DC Controller
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.
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.