LTC3520

RECOMMENDED FOR NEW DESIGNS

Synchronous 1A Buck-Boost and 600mA Buck Converters

Data Sheet Product Selection Table
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Overview

  • Dual High Efficiency DC/DC Converters:
    • Buck-Boost (VOUT: 2.2V to 5.25V, IOUT = 1A at
      VOUT = 3.3V, VIN ≥ 3V)
    • Buck (VOUT: 0.8V to VIN, IOUT = 600mA)
  • 2.2V to 5.5V Input Voltage Range
  • Pin-Selectable Burst Mode® Operation
  • Uncommitted Gain Block for LDO Controller, Battery Good Indication or Sequencing
  • Programmable 100kHz to 2MHz Switching Frequency
  • 55μA Total Quiescent Current for Both Converters in Burst Mode Operation
  • Thermal and Overcurrent Protection
  • <1μA Quiescent Current in Shutdown
  • 24-Lead 4mm × 4mm QFN Package

The LTC3520 combines 1A buck-boost and 600mA synchronous buck DC/DC converters in a tiny 4mm x 4mm package. A programmable switching frequency allows the efficiency to be optimized while minimizing the solution footprint. Both converters feature soft-start and current limit protection. The uncommitted gain block can be configured as an LDO or utilized as a battery-good comparator.

The buck converter is current mode controlled with internal synchronous rectification to improve efficiency. Pin-selectable Burst Mode operation can be enabled to improve light load efficiency, or the buck converter can be operated in low noise PWM mode for sensitive applications.

The buck-boost converter provides continuous conduction operation to maximize efficiency and minimize noise. At light loads, use of Burst Mode operation will improve efficiency.

The LTC3520 provides a <1µA shutdown mode and over- temperature shutdown on both converters. The LTC3520 is available in a low profile (0.75mm) 24-lead 4mm x 4mm QFN package.

Applications

  • Portable Media Players
  • Digital Cameras
  • Handheld PCs, PDAs
  • GPS Receivers
LTC3520
Synchronous 1A Buck-Boost and 600mA Buck Converters
3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter Efficiency vs VIN Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3520
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
DC1062A

LTC3520EUF| Buck-Boost with 400mA Buck, VIN = 2.2V to 5.5V, VOUT1 = 3.3V @ 1A (BB), VOUT2 = 1.8V @ 0.6A, VOUT3 (LDO Post Regulator) = 1.5V @ 200mA

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Product Details

Demonstration circuit 1062 is a micropower synchronous buck-boost + buck converter based on the LTC3520. The DC1062 has an input voltage range of 2.2V to 5.5V and three output voltages: 3.3V @ up to 1A, 1.8V @ 600mA and 1.5V @ 200mA. The 1.5VOUT is an LDO regulator derived from either the 3.3VOUT or the 1.8VOUT.
DC1062A
LTC3520EUF| Buck-Boost with 400mA Buck, VIN = 2.2V to 5.5V, VOUT1 = 3.3V @ 1A (BB), VOUT2 = 1.8V @ 0.6A, VOUT3 (LDO Post Regulator) = 1.5V @ 200mA
DC1062A - Schematic

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