LTC3499

RECOMMENDED FOR NEW DESIGNS

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

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Overview

  • 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

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.

Applications

  • Medical Equipment
  • Digital Cameras
  • MP3 Players
  • Handheld Instruments
LTC3499
750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection
Two AA Cells to 5V Synchronous Boost Converter Battery Current vs VIN Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3499
  • LTC3499B
LTspice

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.

Evaluation Kits

eval board
schematic 1
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

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Product Details

Demonstration circuit 849B is a 750mA, 1.2MHz Synchronous Boost Converter with Reverse Battery Protection featuring the LTC3499BEDD. The LTC3499"B" has Burst Mode disabled and will continuously switch at light loads. The demo board demonstrates a DC/DC boost converter, with a 750mA switch current limit, providing a jumper-selectable 3.3V output at 250mA from a two cell input voltage, or a 5V output at 170mA from either a two cell or a Li-ion battery.The input range is 1.8V to 3V when the output is 3.3V and the output current can be up to 500mA depending on the input voltage. The input range is 1.8V to 4.2V when the output is 5V and the output current can be as high as 480mA.


The LTC3499BEDD offers integrated reverse battery protection up to –6V for both the part and the load, drawing typically less than 1µA of current.

eval board
schematic 2
DC849A

LTC3499EDD Demo Board | Reverse Batt Protection, 1.8V ≤ VIN ≤ 3V or 4.2V, VOUT = 3.3V @ up to 250mA or VOUT = 5V @ up to 170mA

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Product Details

Demonstration circuit 849A is a 750mA, 1.2MHz Synchronous Boost Converter with Reverse Battery Protection featuring the LTC3499EDD. The demo board demonstrates a DC/DC boost converter, with a 750mA switch current limit, providing a jumper-selectable 3.3V output at 250mA from a two cell input voltage, or a 5V output at 170mA from either a two cell or a Li-ion battery.The input range is 1.8V to 3V when the output is 3.3V and the output current can be up to 500mA depending on the input voltage. The input range is 1.8V to 4.2V when the output is 5V and the output current can be as high as 480mA.


The LTC3499EDD offers integrated reverse battery protection up to –6V for both the part and the load, drawing typically less than 1uA of current.
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
DC849B - Schematic
DC849A
LTC3499EDD Demo Board | Reverse Batt Protection, 1.8V ≤ VIN ≤ 3V or 4.2V, VOUT = 3.3V @ up to 250mA or VOUT = 5V @ up to 170mA
DC849A - Schematic

Latest Discussions

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LTC3499 SS pin voltage simulates strange
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