The ADP1853 is a wide range input, dc-to-dc, synchronous buck controller capable of running from commonly used 3.3 V to 12 V (up to 20 V) voltage inputs. The device nominally operates in current mode with valley current sensing providing the fastest step response for digital loads. It can also be configured as a voltage mode controller with low noise and crosstalk for sensitive loads.
The ADP1853 is used as a master synchronization clock for the power system and for convenient synchronization between controllers. The CLKOUT signal can synchronize other devices in the ADP185x family such that slave devices are phase-shifted from the master to reduce the input ripple current, improve EMI, and reduce the size of the input bulk capacitance. The ADP1853 can also be configured as a slave device for current sharing. Additionally, the ADP1853 includes accurate tracking, precision enable, and power good functions for sequencing. The ADP1853 provides a high speed, high peak current gate driving capability to enable energy efficient power conversion. The device can be configured to operate in power saving mode by skipping pulses, reducing switching losses and improving efficiency at light load and standby conditions.
The accurate current limit allows design within a narrower range of tolerances and can reduce overall converter size and cost. The ADP1853 can regulate down to 0.6 V output using a high accuracy reference with ±1% tolerance over the temperature range from −40°C to 125°C.
With a wide range input voltage, the ADP1853 is designed to provide the designer with maximum flexibility for use in a variety of system configurations; loop compensation, soft start, frequency setting, power saving mode, current limit, and current sense gain can all be programmed using external components. In addition, the external RAMP resistor allows choosing optimal slope and VIN feedforward in both current and voltage mode for excellent line rejection. The linear regulator and the boot strap diode for the high-side driver are internal.
Protection features include undervoltage lock out, overvoltage, overcurrent/short circuit, and overtemperature.
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|ADP1853: Synchronous, Step-Down DC-to-DC Controller with Voltage Tracking and Synchronization Datasheet (Rev 0, 05/2012) (pdf, 838 kB)||Data Sheets|
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.
|UG-431: Evaluation Board for the ADP1853 Step-Down DC-to-DC Controller (pdf, 625 kB)||User Guides|
|Analog Devices’ DC-DC Switching Controller Features Current-mode and Voltage-mode Options for High-current Applications (11 Jun 2012)||Press Releases||HTML|
|Glossary of EE Terms||Glossary||HTML|
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ADP1851-53 Buck Designer Tool
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
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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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Evaluation board for ADP1853: Synchronous, Step-Down DC-to-DC Controller with Voltage Tracking and Synchronization
Blank/Unpopulated boards need to be ordered through the appropriate download tool from ADIsimPower.
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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