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ADP2140:  3 MHz, 600 mA, Low Quiescent Current Buck with 300 mA LDO Regulator

Product Details

Product Status:Recommended for New Designs

The ADP2140 includes a high efficiency, low quiescent 600 mA stepdown dc-to-dc converter and a 300 mA LDO packaged in a small 10-lead 3 mm × 3 mm LFCSP. The total solution requires only four tiny external components.

The buck regulator uses a proprietary high speed current-mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2140 has a power saving variable frequency mode to reduce switching frequency under light loads.

The LDO is a low quiescent current, low dropout linear regulator designed to operate in a split supply mode with VIN2 as low as 1.65 V. The low input voltage minimum allows the LDO to be powered from the output of the buck regulator increasing efficiency and reducing power dissipation. The ADP2140 runs from input voltages of 2.3 V to 5.5 V allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cell, PCMCIA, and other standard power sources.

All versions include an internal power switch and a synchronous rectifier for minimal external part count and high efficiency. ADP2140 includes a power-good pin, soft start, and internal compensation. Numerous power sequencing options are userselectable through two enable inputs. In autosequencing mode, the highest voltage output enables on the rising edge of EN1. During logic controlled shutdown, the input disconnects from the output and draws less than 100 nA from the input source. Other key features include: undervoltage lockout to prevent deep battery discharge, softstart to prevent input current overshoot at startup, and both short-circuit protection and thermal overload protection circuits to prevent damage in adverse conditions.

When the ADP2140 is used with two 0603 capacitors, one 0402 capacitor, one 0402 resistor, and one 0805 inductor, the total solution size is about 90 mm2 resulting in the smallest footprint solution to meet a variety of portable applications.


Applications
  • Mobile phones
  • Personal media players
  • Digital camera and audio devices
  • Portable and battery-powered equipment

FEATURES and BENEFITS

  • Input voltage range: 2.3 V to 5.5 V
  • LDO input (VIN2) 1.65 V to 5.5 V
  • Buck output voltage range: 1.0 V to 3.3 V
  • LDO output voltage range: 0.8 V to 3.3 V
  • Buck output current: 600 mA
  • LDO output current: 300 mA
  • LDO quiescent current: 22 μA with zero load
  • Buck quiescent current: 20 μA in PSM mode
  • Low shutdown current: <0.3 μA
  • Low LDO dropout 110 mV @ 300 mA load
  • High LDO PSRR
    65 dB @ 10 kHz at VOUT2 = 1.2 V 55 dB @ 100 kHz at VOUT2 = 1.2 V
  • See data sheet for additional features

Typical Application Circuit

Typical Application Circuit
Typical Application Circuit

Documentation

Title Content Type File Type
ADP2140: 3 MHz, 600 mA, Low Quiescent Current Buck with 300 mA LDO Regulator Data Sheet (Rev A, 09/2012) (pdf, 4244 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
Isolating Power in Communication Bus and Gate Drive Applications
Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.
Webcasts WEBCAST
UG-122: Evaluating the ADP2140 Buck and LDO Combination Regulator  (pdf, 784 kB) User Guides PDF
UG-089: RedyKit for the ADP2140  (pdf, 219 kB)
Order the RedyKit for easy product evaluation and prototyping. The RedyKit ships with 2 preset evaluation boards plus 3 each of the standard fixed output voltage options in the product family. This allows evaluation of any voltage option with kit.
User Guides PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI Linear Regulator Design Tool and Parametric Search  (zip)
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
ADIsimPower™ Voltage Regulator Design Tool
This expert design tool produces custom DC-DC converter designs in about a minute. The user enters 5 inputs and chooses to optimize for efficiency, PCB space, cost, or part count. Output is a complete schematic, BOM, efficiency plot, and performance summary. A PDF summary and a blank PCB is offered for each design to facilitate fast prototyping to verify the design.
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

ADP2140 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2140ACPZ1218R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1228R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1233R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1528R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1533R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1812R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1815R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ1833R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ18812R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ2518R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ3312R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ3315R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ3318R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ3325R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me Purchase Sample
ADP2140ACPZ3328R7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $1.20 Y  Material Info Notify Me 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.

ADP2140 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP2140CPZ-REDYKIT Status: Production Evaluation Board $120.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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