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LM2651 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM2651 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 20 page LM2651 www.ti.com SNVS032C – MAY 2004 – REVISED APRIL 2005 LM2651 1.5A High Efficiency Synchronous Switching Regulator Check for Samples: LM2651 1 FEATURES • Input undervoltage lockout • Adjustable soft-start 2 • Ultra high efficiency up to 97% • Current limit and thermal shutdown • High efficiency over a 1.5A to milliamperes load range • 16-pin TSSOP package • 4V to 14V input voltage range APPLICATIONS • 1.8V, 2.5V, 3.3V, or ADJ output voltage • Personal digital assistants (PDAs) • Internal MOSFET switch with low RDS(on) of 75m Ω • Computer peripherals • 300kHz fixed frequency internal oscillator • Battery-powered devices • 7µA shutdown current • Handheld scanners • Patented current sensing for current mode • High efficiency 5V conversion control 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% efficiency. At light loads, the LM2651 enters a low power hysteretic or “sleep” mode to keep the efficiency high. In many applications, 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 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. Typical Application Figure 1. Efficiency vs Load Current (VIN = 5V, VOUT = 3.3V 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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