LTC3531 - 200mA Buck-Boost Synchronous DC/DC Converters

The LTC3531/LTC3531-3.3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes, making the product ideal for single cell Li-Ion and multicell alkaline or nickel applications. The converters operate in Burst Mode, minimizing solution footprint and component count as well as providing high conversion efficiency over a wide range of load currents.

The devices include two 0.5Ω N-channel MOSFET switches and two P-channel switches (0.5Ω, 0.8Ω). Quiescent current is typically 16μA, making the parts ideal for battery power applications. Other features include a <1uA shutdown current, current limiting, thermal shutdown and output disconnect. The parts are offered in a 6-pin ThinSOT package for fi xed voltage versions or a 3mm × 3mm DFN package for fixed and adjustable versions.

Features
  • Regulated Output with Input Above, Below or Equal to the Output
  • Single Inductor
  • Up to 90% Efficiency
  • VIN Range: 1.8V to 5.5V
  • 200mA at 3.3VOUT from 3.6V Input
  • 125mA at 3VOUT from 2.5V Input
  • Fixed VOUT Versions (TSOT, DFN): 3.3V, 3V
  • Adjustable VOUT Version (DFN): 2V to 5V
  • Burst Mode® Operation, No External Compensation
  • Ultra Low Quiescent Current: 16μA, Shutdown Current <1μA
  • Only 3 External Components Required (Fixed Voltage Versions)
  • Short-Circuit Protection
  • Output Disconnect in Shutdown
  • Available in 6-Pin ThinSOT and 3mm × 3mm DFN Packages
Typical Application

Applications
  • Handheld Instruments
  • MP3 Players
  • Handheld computers
  • PDA/GPS
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3531EDD-3.3#PBF3x3 DFN-8E$2.79$1.95
LTC3531EDD-3.3#TRPBF3x3 DFN-8E$2.01
LTC3531EDD-3#PBF3x3 DFN-8E$2.79$1.95
LTC3531EDD-3#TRPBF3x3 DFN-8E$2.01
LTC3531EDD#PBF3x3 DFN-8E$2.79$1.95
LTC3531EDD#TRPBF3x3 DFN-8E$2.01
LTC3531ES6-3.3#TRMPBFSOT-23E$2.86$2.02
LTC3531ES6-3.3#TRPBFSOT-23E$2.86$2.00
LTC3531ES6-3#TRMPBFSOT-23E$2.86$2.02
LTC3531ES6-3#TRPBFSOT-23E$2.86$2.00
Demo Boards
Part NumberDescriptionPrice
DC877ALTC3531ES6-3.3 | 200mA Buck-Boost Synch Converter$75.00
Datasheet
Reliability Data
LT Journal
Press Release
LTspice
Related Product
LTC3531/LTC3531-3.3/LTC3531-3 - 200mA Buck-Boost Synchronous DC/DC Converters
LTC3531/LTC3531-3.3/ LTC3531-3 - 200mA 降压-升压型同步 DC/DC 转换器
LTC3531 Package Drawing LTC3531
R415 - Reliability Data
June 2006 Tiny Buck-Boost Converter for Low Current Applications
200mA、同步降压-升压型 DC/DC 转换器延长手持应用的电池工作时间
LTC3531 Footprints and Symbols
LTC3531 Demo Circuit - Buck-Boost Synchronous Converter (2.9V to 3.3V @ 200mA)