LTC3530

RECOMMENDED FOR NEW DESIGNS

Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

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Overview

  • Regulated Output with Input Voltages Above, Below or Equal to the Output
  • 1.8V to 5.5V Input and 1.8V to 5.25V Output Range
  • 250mA Continuous Output Current from 1.8V VIN
  • 600mA Continuous/1A Peak Output Current from Li-Ion
  • Single Inductor
  • Synchronous Rectification: Up to 96% Efficiency
  • Programmable Automatic Burst Mode® Operation
  • Output Disconnect in Shutdown
  • Pin Compatible with the LTC3440
  • Programmable Frequency from 300kHz to 2MHz
  • <1µA Shutdown Current
  • Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN and 10-Lead MS Packages

The LTC3530 is a wide VIN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single lithium-ion, two-cell alkaline or NiMH applications where the output voltage is within the battery voltage range.

The LTC3530 is pin compatible with the LTC3440 buckboost DC/DC converter but adds programmable automatic Burst Mode operation and extends the VIN/VOUT range to 1.8V. Switching frequencies up to 2MHz are programmed with an external resistor. Automatic Burst Mode operation allows the user to program the load current threshold for Burst Mode operation using a single resistor from the BURST pin to GND.

Other features include 1µA shutdown, short circuit protection, programmable soft-start control, current limit and thermal shutdown. The LTC3530 is available in a thermally enhanced 10-lead (3mm × 3mm) DFN or MSOP package.

Applications

  • MP3 Players
  • Handheld Instruments
  • Digital Cameras
  • Smart Phones
  • Portable GPS Units
  • Miniature Hard Disk Drive Power
LTC3530
Wide Input Voltage Synchronous Buck-Boost DC/DC Converter
LTC3530 Typical Application LTC3530 Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 2
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
LTC4361-1
LTC4361-2
Overvoltage/Overcurrent Protection Controller
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3530
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
DC938A

LTC3530EDD | Low VIN, 600mA Buck-Boost Converter

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Product Details

Demonstration circuit 938 is a micropower synchronous buck-boost converter based on the LTC3530 monolithic buck-boost regulator. The DC938 has an input voltage range of 1.8 V to 5.5V and an output of 3.3V @ 500mA. The converter can work under manual or programmable automatic burst mode, providing high conversion efficiency over a wide range of load currents. The LTC3530 comes in a 10 lead 3×3 DFN package. These features make the DC938 demo board an ideal circuit for use in Li-Ion and dual cell AA (Alkaline/NiCad/NiMH) battery-powered, handheld applications.
DC938A
LTC3530EDD | Low VIN, 600mA Buck-Boost Converter
DC938A - Schematic

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