LTC3447
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LTC3447

I2C Controllable Buck Regulator in 3mm × 3mm DFN

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1ku List Price Starting From $2.42
Features
  • I2C Programmable Output with 21.6mV Resolution
  • Overtemperature Protected
  • High Efficiency: Up to 93%
  • Very Low Quiescent Current: Only 33µA
  • 600mA Output Current at VIN = 3V
  • 2.5V to 5.5V Input Voltage Range
  • 1MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • Stable with Ceramic Capacitors
  • Shutdown Mode Draws <1µA Supply Current
  • ±2% Output Voltage Accuracy
  • Standard (100kHz) or Fast Mode (400kHz) I2C
  • 6-Bit Voltage DAC (0.69V to 2.05V)
  • Disable Burst Mode Operation
  • Enable Power Good Blanking
  • Optional External Start-Up Resistors
  • Soft-Start
  • 10 Lead, 3mm × 3mm DFN Package
Additional Details
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The LTC3447 is a high efficiency monolithic synchronous current mode buck regulator. Using an I2C interface, the output voltage can be set between 0.69V and 2.05V using an internal 6-bit DAC.

The buck regulator has optional external feedback resistors that can be used for setting the initial start up voltage. The feedback voltage reference for this start-up option is 0.6V. Once the voltage DAC is updated via the I2C, the buck regulator switches from external to internal feedback resistors. When there are no external resistors, the default start-up voltage is 1.38V.

The switching frequency is internally set at 1MHz, allowing the use of small surface mount inductors and capacitors.

In Burst Mode® operation, supply current is only 33µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3447 ideally suited for single cell Li-Ion battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode operation increases efficiency at light loads, further extending battery life.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.

Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.

Applications

  • Distributed Power Supplies
  • Notebook Computers
  • PDAs and Other Handheld Devices
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Part Models 2
1ku List Price Starting From $2.42
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LTC3447

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Data Sheet

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UPDATED 11/09/2007
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LTC3447: I²C Controllable Buck Regulator in 3mm × 3mm DFN Data Sheet

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User Guide

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UPDATED 09/24/2009
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DC767A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/23/2018
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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3447EDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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LTC3447EDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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PRODUCTION

Ultra-Low Power Adjustable Supervisor with Power-Fail Output

Evaluation Kits 1

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DC767A

LTC3447EDD Demo Board | I2C-Controllable Buck, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.7V to 2V @ 0.6A

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DC767A

LTC3447EDD Demo Board | I2C-Controllable Buck, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.7V to 2V @ 0.6A

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DC767A
LTC3447EDD Demo Board | I2C-Controllable Buck, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.7V to 2V @ 0.6A
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Product Detail

Demonstration Circuit 767 is an I2C-controlled high efficiency synchronous current mode buck regulator featuring the 600mA output LTC3447. The demo board input voltage range is 2.5V to 5.5V. The buck regulator has a programmable output range of 0.7V to 2.00V which is set with an internal 6-bit DAC via the I2C interface. The initial start-up voltage is set to 1.35V but can be change by changing feedback resistors R4 and R5.

Resources

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DC767A - Schematic Download

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DC767A - Demo Manual Download

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DC767A - Design File Download

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DC767A - Software Download

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Evaluation Kits1

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DC767A

LTC3447EDD Demo Board | I2C-Controllable Buck, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.7V to 2V @ 0.6A

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