Features and BenefitsBuck 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
- Two LDO Regulators: 0.3V Dropout at 50mA
- Dynamically Regulates VCC BATT
- Standard (100kHz) or Fast Mode (400kHz)
- 24-Lead (4mm × 4mm) QFN Package
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.
- Intel’s Microprocessor Supply (PXA27X)
- Portable Instruments
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
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.
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.
Sample & Buy
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