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ADP2371:  High Voltage, 1.2 MHz/600 kHz, 800 mA, Low Quiescent Current Buck Regulator with Quick Output Discharge Function

Product Details

Product Status:Recommended for New Designs

The ADP2370/ADP2371 are high efficiency, low quiescent current, 800 mA buck (step-down) dc-to-dc converters in small 8-lead, 3 mm × 3 mm LFCSP (QFN) packages. The total solution requires only three tiny external components.

The buck regulator uses a proprietary high speed current mode, constant frequency PWM control scheme for excellent stability and transient response. The need for an external rectifier is eliminated by using a high efficiency synchronous rectifier architecture.

To ensure the longest battery life in portable applications, the ADP2370/ADP2371 employ a power saving variable frequency mode that reduces the switching frequency under light load conditions. The ADP2370/ADP2371 operate from input voltages of 3.2 V to 15 V allowing the use of multiple alkaline/NiMH, lithium cells, or other standard power sources.

The ADP2370/ADP2371 offer multiple options for setting the operational frequency. The ADP2370/ADP2371 can be synchronized to a 600 kHz to 1.2 MHz external clock or it can be forced to operate at 600 kHz or 1.2 MHz via the FSEL pin. The ADP2370/ ADP2371 can be forced to operate in PWM mode (FPWM) when noise considerations are more important than efficiency.

A power-good output is available to indicate when the output voltage is below 92% of its nominal value.

The ADP2371 is identical to the ADP2370 except that the ADP2371 includes the addition of an integrated switched resistor, quick output discharge function (QOD) that automatically discharges the output when the device is disabled.

Both devices include an internal power switch and a synchronous rectifier for minimal external part count and high efficiency. The ADP2370/ADP2371 also include internal soft start and internal compensation for ease of use.

During a logic controlled shutdown, the input is disconnected from the output and the regulator draws less than 1.2 μA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent input overcurrent at startup. Short-circuit protection and thermal overload protection circuits prevent damage under adverse conditions.

The ADP2370/ADP2371 each use one 0805 capacitor, one 1206 capacitor, and one 4 mm × 4 mm inductor. The total solution size is about 53 mm2 resulting in a very small footprint solution to meet a variety of portable applications.

APPLICATIONS

  • Portable and battery-powered equipment
  • Automatic meter readers (WSN)
  • Point of sales and transaction processing instruments
  • Medical instruments
  • Medium format display tablets and pads

FEATURES and BENEFITS

  • Input voltage range: 3.2 V to 15 V, output current: 800 mA
  • Quiescent current < 14 µA in power saving mode (PSM)
  • >90% efficiency
  • Force PWM pin (SYNC), 600 kHz/1.2 MHz frequency pin (FSEL)
  • Fixed outputs: 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, 5 V, and adjustable option
  • 100% duty cycle capability
  • Initial accuracy: ±1%
  • Low shutdown current:
    <1.2 µA
  • Quick output discharge (QOD) option (ADP2371)
  • Synchronizable to an external clock
  • 8-lead, 0.75 mm × 3 mm × 3mm LFCSP (QFN) package
  • Supported by ADIsimPower design tool

Typical Application Circuit Diagram for ADP2371

Documentation

Title Content Type File Type
ADP2370/ADP2371: High Voltage, 1.2 MHz/600 kHz, 800 mA, Low Quiescent Current Buck Regulator Data Sheet (Rev D, 02/2014) (pdf, 2218 kB) Data Sheets 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
UG-219: Evaluating the ADP2370/ADP2371 Buck Regulators  (PDF, 1349 kB) User Guides PDF
Ultra-Low Quiescent Current 15 V 800 mA Step Down Synchronous Regulator Improves Power Efficiency and Density for Portable Electronics (18 Apr 2012) Press Releases HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP237x Buck Regulator 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
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.

SampleSample & Buy

Price, packaging, availability

ADP2371 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2371ACPZ-1.2-R7 Status: Production 8 ld LFCSP (3x3mm 1.74x2.38 EP) 8 Ind Reel, 1500 - $1.40 Y  Material Info PCN Purchase Sample
ADP2371ACPZ-1.8-R7 Status: Production 8 ld LFCSP (3x3mm 1.74x2.38 EP) 8 Ind Reel, 1500 - $1.40 Y  Material Info PCN Purchase Sample
ADP2371ACPZ-3.3-R7 Status: Production 8 ld LFCSP (3x3mm 1.74x2.38 EP) 8 Ind Reel, 1500 - $1.40 Y  Material Info PCN Purchase Sample
ADP2371ACPZ-R7 Status: Production 8 ld LFCSP (3x3mm 1.74x2.38 EP) 8 Ind Reel, 1500 - $1.40 Y  Material Info PCN Purchase Sample
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.

ADP2370/71 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2370CPZ-REDYKIT Status: Production Contains Evaluation Board and various fixed/adjustable parts. $60.00 Yes -

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