LT3085
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LT3085

Adjustable 500mA Single Resistor Low Dropout Regulator

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LTspice LT3085 - LDO Linear Regulators Download 0.99 KB LTspice LT3085 Demo Circuit - Adj 500mA Single Resistor LDO Regulator (12V to 1.0V @ 500mA) Download 1.00KB
Part Models 14
1ku List Price Starting From $2.10
Features
  • Outputs May be Paralleled for Higher Current and Heat Spreading
  • Output Current: 500mA
  • Single Resistor Programs Output Voltage
  • 1% Initial Accuracy of SET Pin Current
  • Output Adjustable to 0V
  • Current Limit Constant with Temperature
  • Low Output Noise: 40μVRMS (10Hz to 100kHz)
  • Wide Input Voltage Range: 1.2V to 36V
  • Low Dropout Voltage: 275mV
  • < 1mV Load Regulation
  • < 0.001%/V Line Regulation
  • Minimum Load Current: 0.5mA
  • Stable with Minimum 2.2μF Ceramic Capacitor
  • Current Limit with Foldback and Overtemperature Protected
  • 8-Lead MSOP, and 6-Lead 2mm × 3mm DFN Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT3085 is a 500mA low dropout linear regulator that can be paralleled to increase output current or spread heat on surface mounted boards. Designed as a precision current source and voltage follower, this new regulator finds use in many applications requiring high current, adjustability to zero, and no heat sink. The device also brings out the collector of the pass transistor to allow low dropout operation—down to 275mV—when used with a second supply.

A key feature of the LT3085 is the capability to supply a wide output voltage range. By using a reference current through a single resistor, the output voltage is programmed to any level between zero and 36V. The LT3085 is stable with 2.2μF of capacitance on the output, and the IC uses small ceramic capacitors that do not require additional ESR as is common with other regulators.

Internal protection circuitry includes current limiting and thermal limiting. The LT3085 is offered in the 8-lead MSOP and a low profile (0.75mm) 6-lead 2mm × 3mm DFN package (both with an Exposed Pad for better thermal characteristics).

APPLICATIONS

  • High Current All Surface Mount Supply
  • High Efficiency Linear Regulator
  • Post Regulator for Switching Supplies
  • Low Parts Count Variable Voltage Supply
  • Low Output Voltage Power Supplies
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file View Data Sheet (Rev.C)
Documentation View All Documentation
LTspice LT3085 - LDO Linear Regulators Download 0.99 KB LTspice LT3085 Demo Circuit - Adj 500mA Single Resistor LDO Regulator (12V to 1.0V @ 500mA) Download 1.00KB
Part Models 14
1ku List Price Starting From $2.10
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LT3085

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UPDATED 06/17/2010
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LT3085: Adjustable 500mA Single Resistor Low Dropout Regulator Data Sheet (Rev.C)

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UPDATED 11/17/2010
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LT3085: 抵抗1本で調整可能な500mA、低損失レギュレータ データシート

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Documentation

Solutions Bulletin & Brochure 2

Linear Low Dropout (LDO) Regulator Solutions
Power Management Solutions for NXP Processors

Product Selection Guide 1

Not Your Dad's LDO

Product Selector Card 1

New 3-Terminal Regulators Add Functionality

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2017-09-14

Directly Parallel This High Power Density Linear Regulator - LT3080

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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LT3085EDCB#TRMPBF 6-Lead DFN (2mm x 3mm w/ EP) external-link
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LT3085EDCB#TRPBF 6-Lead DFN (2mm x 3mm w/ EP) external-link
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LT3085EMS8E#PBF 8-Lead MSOP w/ EP external-link
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LT3085IMS8E#PBF 8-Lead MSOP w/ EP external-link
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Evaluation Kits 1

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DC1401A

LT3085EDCB Demo Board | Single Resistor, Low Dropout Regulator, 1.7V ≤ VIN ≤ 25V, VOUT = 1.2V/1.8V/2.5V/3.3V/5V/Adjustable @ 500mA

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DC1401A

LT3085EDCB Demo Board | Single Resistor, Low Dropout Regulator, 1.7V ≤ VIN ≤ 25V, VOUT = 1.2V/1.8V/2.5V/3.3V/5V/Adjustable @ 500mA

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DC1401A
LT3085EDCB Demo Board | Single Resistor, Low Dropout Regulator, 1.7V ≤ VIN ≤ 25V, VOUT = 1.2V/1.8V/2.5V/3.3V/5V/Adjustable @ 500mA
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Product Detail

Demonstration circuit 1401A is an adjustable 500mA linear regulator featuring the LT3085. Architected as a precision current source and voltage follower, the LT3085 can be used in many applications requiring up to 500mA output current, adjustability down to 0V at the output and no heat sink. The device brings out the collector of the pass transistor to allow low dropout operation when used with multiple supplies. The demo board operates with an input voltage range from 1.7V to 25V (the maximum output voltage is limited by the output capacitor's voltage rating) and provides a jumper-selectable output voltage of 1.2V, 1.8V, 2.5V, 3.3V, 5V or a user-defined value.


For the LT3085 to regulate properly, the voltage on the control pin (VCONTROL) must be more than approximately 1.2V greater than the output voltage.


 


 


Resources

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DC1401A- Demo Manual Download

541.00K

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DC1401A - Design File Download

1.00M

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DC1401A - Schematic Download

78.00K

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Evaluation Kits1

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DC1401A

LT3085EDCB Demo Board | Single Resistor, Low Dropout Regulator, 1.7V ≤ VIN ≤ 25V, VOUT = 1.2V/1.8V/2.5V/3.3V/5V/Adjustable @ 500mA

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LT3085 - LDO Linear Regulators Download

0.99 K

spice tool Lt Spice

LT3085 Demo Circuit - Adj 500mA Single Resistor LDO Regulator (12V to 1.0V @ 500mA) Download

1.00K

Reference Designs 4

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Stratix 10 GX Signal Integrity Development Kit

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Stratix 10 GX Signal Integrity Development Kit

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Features and Benefits

  • Analog Devices has worked closely with Intel PSG to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
  • The validated power solutions include uModules power products that address time and space constraints while delivering high efficiency, reliability, and low noise.
  • The actual power tree represents the best solution at time of design.
  • A recommended power tree has also been included to present the ideal solution at time of Stratix 10 GX SI development kit release. An updated alternate version of the power tree represents the latest solutions available from Analog Devices. For many applications, an intermediate rail is not ideal, so recommendations for an alternate power tree that allows for direct power conversion from 12V input is provided below.
View Detailed Reference Design external link

Part Used 12

LTM4668A reference design link

LTM4671 reference design link

LT3085 reference design link

LT3082 reference design link

LTM4638 reference design link

LTM4624 reference design link

LTC4281 reference design link

LTM4630A reference design link

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LTM4650 reference design link

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SoCKit Dev Kit

Arrow/Terasic SoCKit Development Kit

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  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

Part Used 7

LT3080 reference design link

LTC3026 reference design link

LTC3025-1
LTC3025-2
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LTC3025-4 reference design link

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Altera Cyclone V GT FPGA Development Kit

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Altera Cyclone V GT FPGA Development Kit

Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

Part Used 8

LTC3025-1
LTC3025-2
LTC3025-3
LTC3025-4 reference design link

LT3009 reference design link

LTC3855 reference design link

LT3085 reference design link

LT3022 reference design link

LTC3605 reference design link

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DE1-SoC Dev Kit

Terasic DE1-SoC Development Kit

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Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

Part Used 6

LT3085 reference design link

LT3080 reference design link

LTC3633 reference design link

LTM4624 reference design link

LTC3605 reference design link

LTC3608 reference design link

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Stratix 10 GX Signal Integrity Development Kit

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Arrow/Terasic SoCKit Development Kit

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Terasic DE1-SoC Development Kit

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