LTC3646HMSE#PBF

The LTC3646 is a high efficiency, step-down DC/DC converter with internal high side and synchronous power FETs. It draws only 140μA typical DC supply current in Burst Mode operation at no load while maintaining output voltage regulation. The LTC3646 can supply up to a 1A load, and its combination of Burst Mode operation, integrated power switches and low quiescent current provides high efficiency over a broad range of load currents. Alternatively, it can be used in forced continuous mode for ripple sensitive applications. The LTC3646 has a wide 4.0V to 40V input range and its patented controlled on-time architecture and 0.6V reference voltage allow for large step-down ratios without the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or synchronized to an external clock. The internal soft-start, short-circuit protection and voltage rating make the LTC3646 a robust part ideal for high voltage applications.

Applications

• Point of Load Power Supplies
• Intermediate Bus Power
• Automotive Applications

Key features

• Wide Input Voltage Range: 4.0V to 40V
• 1A Guaranteed Output Current
• High Efficiency: Up to 95%
• Wide Output Voltage Range
• LTC3646: 2.0V to 30V
• LTC3646-1: 0.6V to 15V
• ±1% Accurate Reference Voltage
• Internal or External Compensation
• Switching Frequency Adjustable and Synchronizable: 200kHz to 3MHz
• Selectable High Efficiency Burst Mode Operation or Forced Continuous Mode
• 14 Lead 3mm × 4mm DFN or Thermally Enhanced 16-Lead MSOP Packages