LM2651

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2651 SNVS032E – FEBRUARY 2000 – REVISED JANUARY 2016 LM2651 1.5 A High-Efficiency Synchronous Switching Regulator 1 Features 1 Ultrahigh Efficiency up to 97% High-Efficiency Over a 1.5-A to 1.5-mA Load Range 4-V to 14-V Input Voltage Range 1.8-V, 2.5-V, 3.3-V, or ADJ Output Voltage Internal MOSFET Switch With Low RDS(on) of 75 mΩ 300-kHz Fixed Frequency Internal Oscillator 7-µA Shutdown Current Patented Current Sensing for Current Mode Control Input Undervoltage Lockout Adjustable Soft-Start Current Limit and Thermal Shutdown 16-Pin TSSOP Package 2 Applications Personal Digital Assistants (PDAs) Computer Peripherals Battery-Powered Devices Handheld Scanners High-Efficiency 5-V Conversion 3 Description The LM2651 switching regulator provides highefficiency power conversion over a 100:1 load range (1.5 A to 15 mA). This feature makes the LM2651 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes. Synchronous rectification is used to achieve up to 97% efficiency. At light loads, the LM2651 enters a low power hysteretic or sleep mode to maintain high efficiency. In many applications, the efficiency still exceeds 80% at 15-mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10 µA. The LM2651 contains a patented current sensing circuitry for current mode c...