LM2651MTCX-ADJ/NOPB

The LM2651 switching regulator provides high - efficiency 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 control. This feature eliminates the external current sensing resistor required by other current - mode DC - DC converters. The LM2651 has a 300 - kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low - profile components. A programmable soft - start feature limits current surges from the input power supply at start - up and provides a simple means of sequencing multiple power supplies. Other protection features include input undervoltage lockout, current limiting, and thermal shutdown.

Applications

• Personal Digital Assistants (PDAs)
• Computer Peripherals
• Battery - Powered Devices
• Handheld Scanners
• High - Efficiency 5 - V Conversion

Key features

• 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