LTC3204-5

Features:

  Fixed 3.3V or 5V Outputs
  V_IN Range: 
     1.8V to 4.5V (LTC3204-3.3/LTC3204B-3.3)
     2.7V to 5.5V (LTC3204-5/LTC3204B-5)
  Output Current:
     Up to 150mA (LTC3204-5/LTC3204B-5)
     Up to 50mA (LTC3204-3.3/LTC3204B-3.3)
  Automatic Burst Mode® Operation with IQ  = 48µA  (LTC3204-3.3/LTC3204-5)
  Constant Frequency Operation at All Loads  (LTC3204B-3.3/LTC3204B-5)
  Low Noise Constant Frequency (1.2MHz) Operation*
  Built-In Soft-Start Reduces Inrush Current
  Shutdown Disconnects Load from Input
  Shutdown Current <1µA
  Short-Circuit/Thermal Protection
  Available in Low Profile 6-Lead DFN Package


Application

  2 AA Cell to 3.3V
  Li-Ion to 5V
  USB On-The-Go Devices
  White LED Drivers
  Handheld Devices


Specifications

VIN to GND ............................................................0.3V to 6V
VOUT to GND ......................................................0.3V to 5.5V
SHDN to GND ........................................................0.3V to 6V
VOUT Short-Circuit Duration ............................. ........Indefinite
Operating Temperature Range (Note 2) ........40°C to 85°C
Storage Temperature Range ..................  ...65°C to 125°C
Maximum Junction Temperature ................................... 125°C


Description

The LTC^(R) 3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are low noise, constant frequency (1.2MHz) switched ca-pacitor voltage doublers. The LTC3204-3.3/LTC3204B-3.3 can  produce  a  regulated  output  voltage  of  3.3V from a minimum input voltage of 1.8V (2 alkaline cells) whereas the LTC3204-5/LTC3204B-5 can produce 5V from a minimum of 2.7V (Li-Ion battery) input.

LTC3204-3.3/LTC3204-5 feature automatic Burst Mode^(R) operation at light loads to maintain low supply current whereas  LTC3204B-3.3/LTC3204B-5  feature  constant frequency operation at any load. Built-in soft-start circuitry prevents excessive inrush current during start-up. Thermal shutdown and current-limit circuitry allow the parts to survive a continuous short-circuit from VOUT to GND.

High  switching  frequency  minimizes  overall  solution footprint by allowing the use of tiny ceramic capaci-tors. In shutdown, the load is disconnected from the input and the quiescent current is reduced to <1A. The  LTC3204 3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are available in a low profile (0.75mm) 6-lead 2mm * 2mm DFN package.