LTC3528/LTC3528B - 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm x 2mm DFN


  • Delivers 3.3V at 200mA from a Single Alkaline/NiMH Cell or 3.3V at 400mA from Two Cells
  • VIN Start-Up Voltage: 700mV
  • 1.6V to 5.25V VOUT Range
  • Up to 94% Efficiency
  • Output Disconnect
  • 1MHz Fixed Frequency Operation
  • VIN > VOUT Operation
  • Integrated Soft-Start
  • Current Mode Control with Internal Compensation
  • Burst Mode Operation with 12µA Quiescent Current (LTC3528)
  • Low Noise PWM Operation (LTC3528B)
  • Internal Synchronous Rectier
  • Logic Controlled Shutdown: <1µA
  • Anti-Ringing Control
  • Low Prole (3mm x 2mm x 0.75mm) DFN Package

Typical Application

LTC3528 Typical Application
LTC3528 Typical Application


The LTC3528/LTC3528B are synchronous, fixed frequency step-up DC/DC converters with output disconnect. High efficiency synchronous rectification, in addition to a 700mV start-up voltage and operation down to 500mV once started, provides longer run-time for single or multiple cell battery-powered products.

A switching frequency of 1MHz minimizes solution foot- print by allowing the use of tiny, low prole inductors and ceramic capacitors. The current mode PWM is internally compensated, simplifying the design process. The LTC3528 enters Burst Mode operation at light loads, while the LTC3528B features continuous switching at light loads. Anti-ringing circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current, open-drain power good output, short- circuit protection and thermal overload protection.

The LTC3528/LTC3528B are offered in an 8-lead 3mm x 2mm x 0.75mm DFN package.

  Frequency Burst Mode
LTC3528 1MHz Yes
LTC3528B 1MHz No
LTC3528-2 2MHz Yes
LTC3528B-2 2MHz No


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
LTC3528BEDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC3528BEDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC3528BEDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC3528EDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC3528EDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC3528EDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes

LTC3528 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
LTC3528BEDDB#PBF 3x2 DFN-8 E $2.79 Yes
LTC3528BEDDB#TRMPBF 3x2 DFN-8 E $2.79 $2.00 Yes
LTC3528BEDDB#TRPBF 3x2 DFN-8 E $2.79 $1.95 Yes
LTC3528EDDB#PBF 3x2 DFN-8 E $2.79 Yes
LTC3528EDDB#TRMPBF 3x2 DFN-8 E $2.79 $2.00 Yes
LTC3528EDDB#TRPBF 3x2 DFN-8 E $2.79 $1.95 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
DC1211A-A LTC3528EDDB | 1A, 1MHz Synch Boost converter w/ Output Disconnect in DFN Auto Burst Mode $75.00
DC1211A-B LTC3528BEDDB | 1A, 1MHz Synch Boost converter w/ Output Disconnect in DFN PWM Mode $75.00
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