LTC3125

RECOMMENDED FOR NEW DESIGNS

1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit

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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
LTC3125
1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit
PCMCIA/CompactFlash (3.3V/500mA Max), 4V GSM Pulsed Load Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3125
LTspice

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

eval board
schematic 1
DC1267A

LTC3125EDCB Demo Board | 1.5A Switch, 3.3V Input, VOUT = 4V @ 500mA (2A Pulses)

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Product Details

Demonstration circuit 1267A is a step-up DC/DC regulator featuring the LTC3125EDCB and is ideally suited for pulsed load applications where the input current needs to be limited. Demonstration circuit 1267A is configured for 500mA maximum input current limit and can handle pulsed load currents of up to 2A, with duty cycles of up to 15%. The input voltage range is 3.3V ±10%.
DC1267A
LTC3125EDCB Demo Board | 1.5A Switch, 3.3V Input, VOUT = 4V @ 500mA (2A Pulses)
DC1267A - Schematic

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