ADI LTC3445EUF#TRPBF

The - TC*3445 contains a high efficiency monolithic synchronous current mode buck regulator, two LDO regulators, a PowerPathTM controller and an |^2C^TM 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 |20rangle 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 360uA and drops to 27uA 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.

• High Efficiency: Up to 93%
• 600mA Output Current (VCC = 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
• Two LDO Regulators: 0.3V Dropout at 50mA
• PowerPath Controller Dynamically Regulates VCC BATT
• Standard (100kHz) or Fast Mode (400kHz)
• 24-Lead (4mm × 4mm) QFN Package

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