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LTC3499 - 750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

Features

  • Reverse-Battery Protection for DC/DC Converter and Load
  • High Efficiency: Up to 94%
  • Generates 5V at 175mA from a 1.8V Input
  • Operates from 1.8V to 5.5V Input Supply
  • 2V to 6V Adjustable Output Voltage
  • Inrush Current Controlled During Start-Up
  • Output Disconnnect in Shutdown
  • Low Noise 1.2MHz PWM Operation
  • Tiny External Components
  • Automatic Burst Mode® Operation (LTC3499)
  • Continuous Switching at Light Loads (LTC3499B)
  • Overvoltage Protection
  • 8-Lead (3mm × 3mm × 0.75mm) DFN and MSOP Packages

Typical Application

LTC3499 Typical Application
LTC3499 Typical Application

Description

The LTC3499/LTC3499B are synchronous, fixed frequency step-up DC/DC power converters with integrated reverse battery protection that protect and disconnect the devices and load when the battery polarity is reversed while delivering high efficiency in a small (3mm × 3mm) DFN package. True output disconnect eliminates inrush current and allows zero load current in shutdown.

The devices feature an input voltage range of 1.8V to 5.5V enabling operation from two alkaline or NiMH batteries. The switching frequency is internally set at 1.2MHz allowing the use of tiny surface mount inductors and capacitors. A minimal number of external components are required to generate output voltages ranging from 2V to 6V. The LTC3499 features automatic Burst Mode operation to increase efficiency at light loads, while the LTC3499B features continuous switching at light loads.

The soft-start time is externally programmable through a small capacitor. Anti-ring circuitry reduces EMI emissions by damping the inductor in discontinuous mode. The devices feature <1μA shutdown supply current, integrated overvoltage protection and are available in both 8-pin (3mm × 3mm) DFN and 8-pin MSOP packages.

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
LTC3499BEDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3499BEDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3499BEMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LTC3499BEMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LTC3499EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3499EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC3499EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LTC3499EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes


LTC3499 Package Drawing
LTC3499 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
LTC3499BEDD#PBF 3x3 DFN-8 E $3.07 $2.15 Yes
LTC3499BEDD#TRPBF 3x3 DFN-8 E $2.21 Yes
LTC3499BEMS8#PBF MS-8 E $3.07 $2.15 Yes
LTC3499BEMS8#TRPBF MS-8 E $2.21 Yes
LTC3499EDD#PBF 3x3 DFN-8 E $3.07 $2.15 Yes
LTC3499EDD#TRPBF 3x3 DFN-8 E $2.21 Yes
LTC3499EMS8#PBF MS-8 E $3.07 $2.15 Yes
LTC3499EMS8#TRPBF MS-8 E $2.21 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
DC849A LTC3499EDD Demo Board | Reverse Batt Protection, 1.8V ≤ VIN ≤ 3V or 4.2V, Vout = 3.3V @ up to 500mA or Vout = 5V @ up to 480mA $100.00
DC849B LTC3499BEDD Demo Board | Reverse Batt Protection, 1.8V ≤ VIN ≤ 3V or 4.2V, Vout = 3.3V @ up to 500mA or Vout = 5V @ up to 480mA $100.00
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Applications

  • Medical Equipment
  • Digital Cameras
  • MP3 Players
  • Handheld 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

Models for the following parts are available in LTspice:
LTC3499
LTC3499B

Technical Support