LT3028

RECOMMENDED FOR NEW DESIGNS

LT3028

Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs

RECOMMENDED FOR NEW DESIGNS

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Part Models 8

1ku List Price Starting From $3.47

Features

Low Noise: 20µV_RMS (10Hz to 100kHz)
Low Quiescent Current: 30µA/Output
Independent Inputs
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA/500mA
Very Low Shutdown Current: <0.1µA
Low Dropout Voltage: 300mV/320mV at 100mA/500mA
Adjustable Outputs from 1.22V to 20V
Stable with as Low as 1µF/3.3µF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic Capacitors
Reverse-Battery Protected
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Tracking/Sequencing Capability
Thermally Enhanced 16-Lead TSSOP and 16-Lead (5mm × 3mm) DFN Packages

Additional Details

The LT3028 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external 0.01µF bypass capacitor, output noise is a low 20µV_RMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 30µA quiescent current per output makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1µA. Shutdown control is independent for each output, allowing for flexibility in power management. The device is capable of operating over an input voltage range of 1.8V to 20V. Output 1 can supply 500mA of output current with a dropout voltage of 320mV. The device can supply 100mA of output current from Output 2 with a dropout voltage of 300mV. Quiescent current is well controlled in dropout.

The LT3028 regulator is stable with output capacitors as low as 1µF for the 100mA output and 3.3µF for the 500mA output. Small ceramic capacitors can be used without the series resistance required by other regulators.

Internal protection circuitry includes reverse-battery protection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm × 3mm × 0.75mm) DFN packages.

Applications

Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
Tracking/Sequencing Power Supplies

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 8

1ku List Price Starting From $3.47

Technical Documents 4

LT3028: Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs Data Sheet 10/07/2004

R386 Reliability Data 03/22/2018

DC832A - Demo Manual 09/24/2009

Dual 500mA µPower LDO Features Independent 1.8V–20V Inputs and Easy Sequencing in a 4mm × 3mm DFN 04/01/2010

Reference Materials 1

Linear Low Dropout (LDO) Regulator Solutions 04/17/2018

Design Resources 8

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.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3028EDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028EDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028EFE#PBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028EFE#TRPBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028IDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028IDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028IFE#PBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3028IFE#TRPBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3028EDHC#PBF
Pin/Package Drawing
16-Lead DFN (5mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028EDHC#TRPBF
Pin/Package Drawing
16-Lead DFN (5mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028EFE#PBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028EFE#TRPBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028IDHC#PBF
Pin/Package Drawing
16-Lead DFN (5mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028IDHC#TRPBF
Pin/Package Drawing
16-Lead DFN (5mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028IFE#PBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3028IFE#TRPBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3028EFE#PBF

PRODUCTION

LT3028EFE#TRPBF

PRODUCTION

LT3028IFE#PBF

PRODUCTION

LT3028IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3028EFE#PBF

PRODUCTION

LT3028EFE#TRPBF

PRODUCTION

LT3028IFE#PBF

PRODUCTION

LT3028IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

DC832A

LT3028DHC Demo Board | Dual Input, Dual Output Linear Regulator, 2.3V ≤ VIN ≤ 20V, VOUT1 = 2.5V/3.3V/5V @ 500mA, VOUT2 = 2.5V/3.3V/5V @ 100mA

LT3028DHC Demo Board | Dual Input, Dual Output Linear Regulator, 2.3V ≤ VIN ≤ 20V, VOUT1 = 2.5V/3.3V/5V @ 500mA, VOUT2 = 2.5V/3.3V/5V @ 100mA

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DC832A

LT3028DHC Demo Board | Dual Input, Dual Output Linear Regulator, 2.3V ≤ VIN ≤ 20V, VOUT1 = 2.5V/3.3V/5V @ 500mA, VOUT2 = 2.5V/3.3V/5V @ 100mA

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Product Detail

Demonstration circuit 832 is a dual output, dual input regulator consisting of two LDO linear regulators, based on the LT3028 monolithic linear regulator in the 5×3 DFN-16 package. Each independent input has a voltage range of 2.3V to 20V, with one output (V_OUT1) capable of delivering up to 500mA of output current, and the other output (V_OUT2) capable of delivering up to 100mA of output current. The two output voltages are set independently with jumpers; each can be set to 2.5V, 3.3V, 5V or a user-defined value (two jumper options for this).

The DC quiescent current is typically only 50uA (for the entire IC) at no load.

Resources

PDF

DC832A - Demo Manual

324.00K

PDF

DC832A - Schematic

34.00K

ZIP

DC832A - Design File

635.00K

DC832A

LT3028DHC Demo Board | Dual Input, Dual Output Linear Regulator, 2.3V ≤ VIN ≤ 20V, VOUT1 = 2.5V/3.3V/5V @ 500mA, VOUT2 = 2.5V/3.3V/5V @ 100mA

LTspice 2

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.