LTC3538 - 800mA Synchronous Buck-Boost DC/DC Converter

Features

• Click Here for LTC3538 Evaluation Kit
• Regulated Output with Input Voltages Above, Below, or Equal to the Output
• 800mA Continuous Output Current from a Single Lithium-Ion/Polymer Cell
• Single Inductor
• 1.8V to 5.25V V_OUT Range
• 2.4V to 5.5V V_IN Range
  
• 1MHz Fixed Frequency Operation
• Output Disconnect in Shutdown
• 2.4V to 5.5V Input
• 35µA Quiesecent Current in Burst Mode Operation
• <5µA Shutdown Current
• Internal Soft-Start
• Small, Thermally Enhanced 8-Lead (2mm x 3mm) DFN package

Typical Application

Description

The LTC3538 is a highly efficient, low noise, buck-boost DC/DC converter that operates from input voltages above, below, and 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 or multicell Alkaline or NiMH applications where the output voltage is within the battery voltage range.

The LTC3538 is suited for use in Micro Hard Disk Drive (µHDD) applications with its 800mA current capability. Burst Mode operation provides high efficiency at light loads. The LTC3538 includes two 0.17Ω N-channel and two 0.2Ω P-channel MOSFET switches. Operating frequency is internally set to 1MHz to minimize solution footprint while maximizing efficiency.

Other features include <5µA shutdown current, internal soft-start, short circuit protection and thermal shutdown. The LTC3538 is available in a low profile (0.75mm), thermally enhanced 8-lead (2mm x 3mm) DFN package.

Packaging

DFN-8

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC3538EDCB#PBF	DFN	8	E	$3.64		View
LTC3538EDCB#TRMPBF	DFN	8	E	$3.64	$2.60	View
LTC3538EDCB#TRPBF	DFN	8	E	$3.64	$2.55	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC1095A	LTC3538EDCB - 800mA Synchronous Buck-Boost DC/DC Converter	$75.00
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Applications

• Miniature Hard Disk Drives
• MP3 Players
• Digital Cameras
• Cellular Handsets
• PDAs, Handheld PC
• GPS Receivers

Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.