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LM2678S-3.3 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM2678S-3.3 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 23 page  LM2678 SIMPLE SWITCHER® High Efficiency 5A Step-Down Voltage Regulator General Description The LM2678 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteris- tics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjust- able output version. The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260KHz) allows the use of physically smaller sized components. A family of standard in- ductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process. The LM2678 series also has built in thermal shutdown, cur- rent limiting and an ON/OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is guaranteed to a ±2% toler- ance. The clock frequency is controlled to within a ±11% tol- erance. Features n Efficiency up to 92% n Simple and easy to design with (using off-the-shelf external components) n 120 m Ω DMOS output switch n 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions n 50µA standby current when switched OFF n ± 2%maximum output tolerance over full line and load conditions n Wide input voltage range: 8V to 40V n 260 KHz fixed frequency internal oscillator n −40 to +125˚C operating junction temperature range Applications n Simple to design, high efficiency (>90%) step-down switching regulators n Efficient system pre-regulator for linear voltage regulators n Battery chargers Typical Application SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. DS100886-3 March 2000 © 2000 National Semiconductor Corporation DS100886 www.national.com |
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