LTC3520
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3520

Synchronous 1A Buck-Boost and 600mA Buck Converters

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $4.19
Features
  • 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
Additional Details
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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
Part Models 4
1ku List Price Starting From $4.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3520EUF#PBF
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Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3520EUF#PBF

PRODUCTION

LTC3520EUF#TRPBF

PRODUCTION

LTC3520IUF#PBF

PRODUCTION

LTC3520IUF#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3520EUF#PBF

PRODUCTION

LTC3520EUF#TRPBF

PRODUCTION

LTC3520IUF#PBF

PRODUCTION

LTC3520IUF#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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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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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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

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