LTC3440
PRODUCTIONMicropower Synchronous Buck-Boost DC/DC Converter
- Part Models
- 4
- 1ku List Price
- Starting From $4.18
Overview
- Single Inductor
- Fixed Frequency Operation with Battery Voltages
- Above, Below or Equal to the Output
- Synchronous Rectification: Up to 96% Efficiency
- 25µA Quiescent Current in Burst Mode® Operation
- Up to 600mA Continuous Output Current
- No Schottky Diodes Required (VOUT < 4.3V)
- VOUT Disconnected from VIN During Shutdown
- 2.5V to 5.5V Input and Output Range
- Programmable Oscillator Frequency from 300kHz to 2MHz
- Synchronizable Oscillator
- Burst Mode Enable Control
- <1µA Shutdown Current
- Small Thermally Enhanced 10-Pin MSOP and (3mm × 3mm) DFN Packages
The LTC3440 is a high efficiency, fixed frequency, Buck-Boost DC/DC converter that operates from input voltages above, below or 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, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range.
The device includes two 0.19Ω N-channel MOSFET switches and two 0.22Ω P-channel switches. Switching frequencies up to 2MHz are programmed with an external resistor and the oscillator can be synchronized to an external clock. Quiescent current is only 25µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin has either a clock or is driven low, then fixed frequency switching is enabled.
Other features include a 1µA shutdown, soft-start control, thermal shutdown and current limit. The LTC3440 is available in the 10-pin thermally enhanced MSOP package.
Protected by U.S. Patents including 6404251, 6166527.
Applications
- Palmtop Computers
- Handheld Instruments
- MP3 Players
- Digital Cameras
Documentation
Data Sheet 1
User Guide 2
Design Note 2
Technical Articles 4
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 |
|---|---|---|---|
| LTC3440EDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3440EDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3440EMS#PBF | 10-Lead MSOP | ||
| LTC3440EMS#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3440EMS#PBF | PRODUCTION | |
| LTC3440EMS#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice 1
Models for the following parts are available in LTspice:
- LTC3440
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.
