LTC3520

RECOMMENDED FOR NEW DESIGNS

Synchronous 1A Buck-Boost and 600mA Buck Converters

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.19

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Part Details

Dual High Efficiency DC/DC Converters:
- Buck-Boost (V_OUT: 2.2V to 5.25V, I_OUT = 1A at
  V_OUT = 3.3V, V_IN ≥ 3V)
- Buck (V_OUT: 0.8V to V_IN, I_OUT = 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

Part Models: 4
1ku List Price: Starting From $4.19

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3520EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3520EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3520IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3520IUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3520EUF#PBF	PRODUCTION
LTC3520EUF#TRPBF	PRODUCTION
LTC3520IUF#PBF	PRODUCTION
LTC3520IUF#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Single-Supply Monitors 1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds

Tools & Simulations

LTspice 1

LTC3520 - Buck-Boost Regulators

Models for the following parts are available in LTspice:

LTC3520

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

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 1.5V_OUT is an LDO regulator derived from either the 3.3V_OUT or the 1.8V_OUT.

Resources

DC1062A - Design File
728.00K

DC1062A - Schematic
29.00K

DC1062A - Demo Manual
419.00K

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