LTC3127 - 1A Buck-Boost DC/DC Converter with Programmable Input Current Limit

The LTC3127 is a wide VIN range, highly efficient, 1.35MHz fixed frequency buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The LTC3127 features programmable average input current limit, making it ideal for power-limited input sources. The input current limit is programmed with a single resistor and is accurate from 0.2A to 1A of average input current.

The topology incorporated provides a continuous transfer function through all operating modes. Other features include <1μA shutdown current, pin-selectable Burst Mode operation and thermal overload protection. The LTC3127 is housed in thermally enhanced 10-lead (3mm × 3mm × 0.75mm) DFN packages and 12-lead MSOP packages.

Features
  • Programmable (0.2A to 1A) ±4% Accurate Average Input Current Limit
  • Regulated Output with Input Voltages Above, Below or Equal to the Output
  • 1.8V to 5.5V (Input) and 1.8V to 5.25V (Output) Voltage Range
  • 0.6A Continuous Output Current: VIN > 1.8V
  • 1A Continuous Output Current: VIN > 3V
  • Single Inductor
  • Synchronous Rectification: Up to 96% Efficiency
  • Burst Mode® Operation: IQ = 35μA (Pin Selectable)
  • Output Disconnect in Shutdown
  • <1μA Shutdown Current
  • Small, Thermally Enhanced 10-Lead (3mm × 3mm × 0.75mm) DFN and 12-Lead MSOP Packages
Typical Application

Applications
  • USB Powered GSM Modems
  • Supercap Charger
  • Handheld Test Instruments
  • PC Card Modems
  • Wireless Terminals
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3127EDD#PBF3x3 DFN-10E$4.22$2.95
LTC3127EDD#TRPBF3x3 DFN-10E$3.01
LTC3127EMSE#PBFMS-12EE$4.29$3.00
LTC3127EMSE#TRPBFMS-12EE$3.06
Demo Boards
Part NumberDescriptionPrice
DC1451ALTC3127EDD Demo Board | Prog Average Input Current Limit, 1.2MHz, 1.8V ≤ VIN ≤ 5.5V, Vout = 3.8V @ 2A Pulsed$100.00
Datasheet
Reliability Data
Press Release
LTspice
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