Features and Benefits
- 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 VOUT Range
- 2.4V to 5.5V VIN 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
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.
- Miniature Hard Disk Drives
- MP3 Players
- Digital Cameras
- Cellular Handsets
- PDAs, Handheld PC
- GPS Receivers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit DC1095 is a micropower synchronous buck-boost converter based on the LTC3538 monolithic buck-boost regulator. The DC1095 has an input voltage range of 2.4V to 5.5V and an output of 3.3V @ 800mA.
Tools & Simulations
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.
Models for the following parts are available in LTspice:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.