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LTC3527 - Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

Features

  • Dual Synchronous Step-Up DC/DC Converters
  • Delivers 3.3V at 200mA/100mA from one Alkaline/ NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
  • VIN Start-Up Voltage: 700mV
  • 0.5V to 5V VIN Range After Start-Up
  • 1.6V to 5.25V VOUT Range
  • Output Disconnect in Shutdown
  • VIN > VOUT Operation
  • 1.2MHz or 2.2MHz Operation
  • Up to 94% Efficiency
  • 12μA Quiescent Current in Burst Mode® Operation
  • Inrush Current Limiting and Soft-Start
  • Internal Synchronous Rectifiers
  • Logic-Controlled Shutdown (< 2μA)
  • Quick VOUT Discharge (LTC3527-1)
  • 16-Lead, 0.75mm × 3mm × 3mm QFN Package

Typical Application

LTC3527 Typical Application
LTC3527 Typical Application

Description

The LTC3527/LTC3527-1 are dual high efficiency, step-up DC/DC converters in a space saving 16-lead 3mm × 3mm QFN package. Battery life is maximized with a 700mV startup voltage and operation down to 500mV once started. The SHDN and PGOOD pins enable the converters to be sequenced or started together.

The LTC3527/LTC3527-1 limit inrush current during startup. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solution footprint. The current mode PWM design is internally compensated reducing external parts count. Burst Mode operation or fixed frequency operation is selectable via the MODE pin. Anti-ring circuitry reduces EMI in discontinuous mode. This device also features thermal shutdown.

True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges VOUT1 or VOUT2 when its respective SHDN goes low. Quiescent current in shutdown is less than 2μA.

Packaging

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
Drawing		 RoHS
LTC3527EUD-1#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3527EUD-1#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3527EUD#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3527EUD#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes


LTC3527 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
(1-99)		 Price
(1k)*		 RoHS
LTC3527EUD-1#PBF 3x3 QFN-16 E $4.22 $2.95 Yes
LTC3527EUD-1#TRPBF 3x3 QFN-16 E $3.01 Yes
LTC3527EUD#PBF 3x3 QFN-16 E $4.22 $2.95 Yes
LTC3527EUD#TRPBF 3x3 QFN-16 E $3.01 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
DC1237A-A LTC3527EUD Demo Board | Dual, 1.2MHz or 2.2MHz, 0.5V ≤ VIN ≤ 5V, Vout1 = 3V/3.3V/5V(800mA Switch), Vout2 = 1.8V/2.85V/3.3V(400mA Switch) Contact Factory
DC1237A-B LTC3527EUD-1 Demo Board | Dual, 1.2MHz or 2.2MHz, 0.5V ≤ VIN ≤ 5V, Vout1 = 3V/3.3V/5V(800mA Switch), Vout2 = 1.8V/2.85V/3.3V(400mA Switch) Contact Factory
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Click here to view our complete list of demo boards

Applications

  • MP3/Personal Media Players
  • Noise Canceling/Bluetooth Headsets
  • Wireless Mice
  • Portable Medical Instruments

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

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Models for the following parts are available in LTspice:
LTC3527
LTC3527-1

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