LTC3445
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LTC3445

I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN

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1ku List Price Starting From $3.25
Features
Buck Regulator
  • High Efficiency: Up to 93%
  • 600mA Output Current (VCC1 = 3V, VOUT = 1.3V)
  • Programmable Output Voltage: 0.85V to 1.55V
  • 2.5V to 5.5V Input Voltage Range
  • 1.5MHz Constant Frequency or Spread Spectrum Option
  • Soft-Start
LDOs
  • Two LDO Regulators: 0.3V Dropout at 50mA
PowerPath Controller
  • Dynamically Regulates VCC BATT
I2C
  • Standard (100kHz) or Fast Mode (400kHz)
  • 24-Lead (4mm × 4mm) QFN Package
Additional Details
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The LTC3445 contains a high efficiency monolithic synchronous current mode buck regulator, two LDO regulators, a PowerPath™ controller and an I2C™ interface.

The buck regulator has a 6-bit programmable output range of 0.85V to 1.55V. Also, the buck regulator uses either a constant (1.5MHz) or a spread spectrum switching frequency. Using the spread spectrum option allows for a lower noise regulated output as well as low noise at the input. In addition, the regulated output voltage slew rate is programmable via the I2C interface.

The LTC3445 contains two LDO voltage regulators. The regulator output voltages are externally resistor programmable. Each LDO is capable of delivering up to 50mA.

The LTC3445 contains control circuitry (PowerPath) for automatic back-up battery selection. VBACKUP is typically a coin cell.

Typical supply current during operation is only 360µA and drops to 27µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3445 ideal for single Li-Ion battery-powered applications. Automatic Burst Mode® operation increases efficiency at light loads, further extending battery life.

Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, Spread Spectrum patent pending.

Applications

  • Intel’s Microprocessor Supply (PXA27X)
  • Portable Instruments
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LTC3445

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Data Sheet

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UPDATED 12/17/2008
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LTC3445: I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN Data Sheet

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UPDATED 04/20/2006
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LTC3445: 4mm×4mm QFNパッケージに2個のLDOを搭載したI2C制御可能な降圧レギュレータ データシート

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User Guide

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UPDATED 09/24/2009
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DC698A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/23/2018
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R415 Reliability Data redirect icon

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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
LTC3445EUF#PBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LTC3445EUF#TRPBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Software & Part Ecosystem

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PRODUCTION

Low Voltage I2C/SMBus Accelerator

Evaluation Kits 1

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DC698A

LTC3445EUF Demo Board | I2C-Controllable Buck Plus Dual LDO & PowerPath, 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 0.85 to 1.55 @ 0.6A, VOUT2 = 1.3V @ 50mA, VOUT3 = 1.1V @ 50mA

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DC698A

LTC3445EUF Demo Board | I2C-Controllable Buck Plus Dual LDO & PowerPath, 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 0.85 to 1.55 @ 0.6A, VOUT2 = 1.3V @ 50mA, VOUT3 = 1.1V @ 50mA

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DC698A
LTC3445EUF Demo Board | I2C-Controllable Buck Plus Dual LDO & PowerPath, 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 0.85 to 1.55 @ 0.6A, VOUT2 = 1.3V @ 50mA, VOUT3 = 1.1V @ 50mA
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Product Detail

Demonstration Circuit 698 is an I2C-controlled high efficiency 600mA synchronous current mode buck regulator and two 50mA linear regulators featuring the LTC3445. The LTC3445 also features backup/main battery power path selection. The input voltage range is 2.5V to 5.5V. The buck regulator has a programmable output range of 0.85V to 1.55V and the two LDOs provide 1.3V@50mA and 1.1V@ 50mA.

Resources

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DC698A - Design File Download

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DC698A - Schematic Download

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DC698A - Demo Manual Download

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Software

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DC698A - Software Download

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Evaluation Kits1

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DC698A

LTC3445EUF Demo Board | I2C-Controllable Buck Plus Dual LDO & PowerPath, 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 0.85 to 1.55 @ 0.6A, VOUT2 = 1.3V @ 50mA, VOUT3 = 1.1V @ 50mA

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