DC-DC Switching Buck Step Down Regulator, Adjustable, 1.6V-5.5Vin, 611mV-5.5Vout, 250mAout, DFN-6


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Product Overview

The LTC3549EDCB#TRMPBF is a high-efficiency monolithic synchronous Buck Regulator using a constant-frequency and current-mode architecture. The output voltage is adjusted via an external resistor divider. A fixed switching frequency of 2.25MHz is supported. This switching frequency allows the use of small surface mount inductors and capacitors, including ceramics. Supply current during Burst Mode® operation is only 50µA dropping to <1µA in shutdown. The 1.6 to 5.5V input voltage range makes the LTC3549 ideally suited for single cell Li-ion, li-metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode® operation can be user-enabled, increasing efficiency at light loads, further extending battery life. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.
  • Internal soft-start
  • No Schottky diode required
  • Stable with ceramic capacitors
  • Current-mode operation for excellent line and load transient response
  • Over-temperature protection
  • Up to 93% high efficiency
  • 450mA Peak inductor current
  • 0.611V Reference voltage


Power Management, Consumer Electronics, Portable Devices

Product Information

Synchronous Buck (Step Down)
Cut Tape
MSL 1 - Unlimited
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