LTC3125
RECOMMENDED FOR NEW DESIGNS1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit
- Part Models
- 2
- 1ku List Price
- Starting From $3.44
Overview
- Programmable Average Input Current Limit
- 5% Input Current Accuracy
- 200mA to 1000mA Program Range
- VIN: 1.8V to 5.5V, VOUT: 2V to 5.25V
- Supports High Current GSM/GPRS Load Burst
- VIN > VOUT Operation
- 1.6MHz Fixed Frequency Operation
- Internal Current Sense Resistor
- 1.2A Peak Current Limit
- Up to 93% Efficiency
- Output Disconnect in Shutdown
- Soft-Start
- Low Quiescent Current Burst Mode® Operation (15μA)
- Available in 2mm × 3mm × 0.75mm DFN Package
The LTC3125 is a high efficiency, synchronous step-up DC/DC converter with an accurate programmable average input current limit. The resistor programmable average input current limit is 5% accurate at 500mA and is suitable for a wide variety of applications. In mobile computing, GSM and GPRS cards demand high current pulses well beyond the capability of the PC Card and CompactFlash slots. The LTC3125 in concert with a reservoir capacitor, keeps the slot power safely within its capabilities providing a high performance and simple solution.
Synchronous rectification produces high efficiency while the 1.6MHz switching frequency minimizes the solution footprint. The current mode PWM design is internally compensated. Output disconnect allows the load to discharge in shutdown, while also providing inrush current limiting.
Other features include a <1μA shutdown current, short circuit and thermal overload protection. The LTC3125 is offered in a low profile 0.75mm × 2mm × 3mm package.
Applications
- GSM/GPRS PCMCIA/CompactFlash PC Card Modems
- Wireless Emergency Locators
- Portable Radios
- Supercap Chargers
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 |
|---|---|---|---|
| LTC3125EDCB#TRMPBF | 8-Lead DFN (2mm x 3mm w/ EP) | ||
| LTC3125EDCB#TRPBF | 8-Lead DFN (2mm x 3mm w/ EP) |
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:
- LTC3125
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
LTC3125EDCB Demo Board | 1.5A Switch, 3.3V Input, VOUT = 4V @ 500mA (2A Pulses)
Resources
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