LT3021/LT3021-1.2/ LT3021-1.5/LT3021-1.8 - 500mA, Low Voltage, Very Low Dropout Linear Regulator


  • VIN Range: 0.9V to 10V
  • Dropout Voltage: 160mV Typical
  • Output Current: 500mA
  • Adjustable Output (VREF = VOUT(MIN) = 200mV)
  • Fixed Output Voltages: 1.2V, 1.5V, 1.8V
  • Stable with Low ESR, Ceramic Output Capacitors (3.3µF Minimum)
  • 0.2% Load Regulation from 0mA to 500mA
  • Quiescent Current: 120µA (Typ)
  • 3µA Typical Quiescent Current in Shutdown
  • Current Limit Protection
  • Reverse-Battery Protection
  • No Reverse Current
  • Thermal Limiting with Hysteresis
  • 16-Pin DFN (5mm × 5mm) and 8-Lead SO Packages

Typical Application

LT3021 Typical Application
LT3021 Typical Application


The LT3021 is a very low dropout voltage (VLDO™) linear regulator that operates from input supplies down to 0.9V. This device supplies 500mA of output current with a typical dropout voltage of 160mV. The LT3021 is ideal for low input voltage to low output voltage applications, providing comparable electrical efficiency to that of a switching regulator.

The LT3021 regulator optimizes stability and transient response with low ESR, ceramic output capacitors as small as 3.3µF. Other LT3021 features include 0.05% typical line regulation and 0.2% typical load regulation. In shutdown, quiescent current typically drops to 3µA.

Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting with hysteresis, and reverse-current protection. The LT3021 is available as an adjustable output device with an output range down to the 200mV reference. Three fixed output voltages, 1.2V, 1.5V and 1.8V, are also available.

The LT3021 regulator is available in the low profile (0.75mm) 16-pin (5mm × 5mm) DFN package with exposed pad and the 8-lead SO package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT3021EDH-1.2#PBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH-1.2#TRPBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH-1.5#PBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH-1.5#TRPBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH-1.8#PBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH-1.8#TRPBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH#PBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021EDH#TRPBF 5x5 DFN-16 DH E 05-08-1709 Yes
LT3021ES8-1.2#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8-1.2#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8-1.5#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8-1.5#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8-1.8#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8-1.8#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021ES8#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LT3021IS8-1.8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT3021IS8-1.8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LT3021 Package Drawing
LT3021 Package Drawing
LT3021 Package Drawing
LT3021 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT3021EDH-1.2#PBF 5x5 DFN-16 E $3.21 $2.25 Yes
LT3021EDH-1.2#TRPBF 5x5 DFN-16 E $2.35 Yes
LT3021EDH-1.5#PBF 5x5 DFN-16 E $3.21 $2.25 Yes
LT3021EDH-1.5#TRPBF 5x5 DFN-16 E $2.35 Yes
LT3021EDH-1.8#PBF 5x5 DFN-16 E $3.21 $2.25 Yes
LT3021EDH-1.8#TRPBF 5x5 DFN-16 E $2.35 Yes
LT3021EDH#PBF 5x5 DFN-16 E $3.21 $2.25 Yes
LT3021EDH#TRPBF 5x5 DFN-16 E $2.35 Yes
LT3021ES8-1.2#PBF SO-8 E $3.21 $2.25 Yes
LT3021ES8-1.2#TRPBF SO-8 E $2.31 Yes
LT3021ES8-1.5#PBF SO-8 E $3.21 $2.25 Yes
LT3021ES8-1.5#TRPBF SO-8 E $2.31 Yes
LT3021ES8-1.8#PBF SO-8 E $3.21 $2.25 Yes
LT3021ES8-1.8#TRPBF SO-8 E $2.31 Yes
LT3021ES8#PBF SO-8 E $3.21 $2.25 Yes
LT3021ES8#TRPBF SO-8 E $2.31 Yes
LT3021IS8-1.8#PBF SO-8 I $3.54 $2.48 Yes
LT3021IS8-1.8#TRPBF SO-8 I $2.54 Yes
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* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC865A LT3021EDH Demo Board | LDO Linear Regulator, 1V ≤ VIN ≤ 10V, Vout = 0.8V/1.2V/1.5V/1.8V @ 500mA $100.00
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