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LM2651MTC-3.3 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2651MTC-3.3 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM2651 1.5A High Efficiency Synchronous Switching Regulator General Description The LM2651 switching regulator provides high efficiency power conversion over a 100:1 load range (1.5A to 15mA). 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% effi- ciency. At light loads, the LM2651 enters a low power hyster- etic or “sleep” mode to keep the efficiency high. In many ap- plications, the efficiency still exceeds 80% at 15mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10µA. 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 oscilla- tor. 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. Features n Ultra high efficiency up to 97% n High efficiency over a 1.5A to milliamperes load range n 4V to 14V input voltage range n 1.8V, 2.5V, 3.3V, or ADJ output voltage n Internal MOSFET switch with low R DS(on) of 75mΩ n 300kHz fixed frequency internal oscillator n 7µA shutdown current n Patented current sensing for current mode control n Input undervoltage lockout n Adjustable soft-start n Current limit and thermal shutdown n 16-pin TSSOP package Applications n Personal digital assistants (PDAs) n Computer peripherals n Battery-powered devices n Handheld scanners n High efficiency 5V conversion Typical Application DS100925-15 Efficiency vs Load Current (V IN = 5V, VOUT = 3.3V) DS100925-1 February 2000 © 2000 National Semiconductor Corporation DS100925 www.national.com |
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