LTC1149CN#PBF - 

DC-DC Switching Buck Step Down Regulator, Adjustable, 12V-48V in, 10mA out, 250kHz, DIP-16

LTC1149CN#PBF - DC-DC Switching Buck Step Down Regulator, Adjustable, 12V-48V in, 10mA out, 250kHz, DIP-16

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Product Overview

The LTC1149CN#PBF is a synchronous step-down switching Regulator Controller features automatic Burst Mode® operation to maintain high efficiencies at low output currents. This device drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant OFF-time current-mode architecture. Special onboard regulation and level-shift circuitry allow operation at input voltage from dropout to 48V (60V absolute maximum). The constant OFF-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current-mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor. The LTC1149 series incorporates automatic power saving Burst Mode® operation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN=12V. In shutdown, both MOSFETs are turned off.
  • Up to 95% ultrahigh efficiency
  • Current-mode operation for excellent line and load transient response
  • High efficiency maintained over wide current range
  • Logic-controlled micropower shutdown
  • Short-circuit protection
  • 100% Duty cycle very low dropout operation
  • Synchronous FET switching for high efficiency
  • Adaptive non-overlap gate drives


Computers & Computer Peripherals, Portable Devices, Power Management, Avionics, Communications & Networking

Product Information

Buck (Step Down)
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