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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM2679 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM2679 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
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1 / 24 page  LM2679 SIMPLE SWITCHER® 5A Step-Down Voltage Regulator with Adjustable Current Limit General Description The LM2679 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 LM2679 are available from several manufacturers to greatly simplify the design process. Other features include the ability to reduce the input surge current at power-ON by adding a softstart timing capacitor to gradually turn on the regulator. The LM2679 series also has built in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is guaranteed to a ±2% tolerance. The clock frequency is con- trolled to within a ±11% tolerance. Features n Efficiency up to 92% n Simple and easy to design with (using off-the-shelf external components) n Resistor programmable peak current limit over a range of 3A to 7A. n 120 m Ω DMOS output switch n 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions 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 Softstart capability 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. DS100847-3 March 2000 © 2000 National Semiconductor Corporation DS100847 www.national.com |
Số phần tương tự - LM2679 |
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Mô tả tương tự - LM2679 |
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