Серия DC-DC интегральных преобразователей LM2574

Общие характеристики

Раздел DC-DC преобразователи интегральные
Максимальный выходной ток
Кол-во выходов
Частота преобразования
Ток собственного потребления
Рабочая температура

Документация на серию LM2574

LM2574 Micrel LM2574 52kHz Simple 0.5A Buck Regulator Final Information General Description Features The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators. The LM2574 contains all of the active circuitry necessary to construct a stepdown (buck) switching regulator and requires a minimum of external components. The LM2574 is available in 3.3V, 5V, and 12V fixed output versions, or an adjustable version with an output voltage range of 1.23V to 37V. Output voltage is guaranteed to ±4% for specified input and load conditions. The LM2574 can supply 0.5A while maintaining excellent line and load regulation. The output switch includes cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions. An external shutdown connection selects operating or standby modes. Standby current is less than 200µA. Heat sinks are generally unnecessary due the regulator’s high efficiency. Adequate heat transfer is usually provided by soldering all package pins to a printed circuit board. The LM2574 includes internal frequency compensation and an internal 52kHz fixed frequency oscillator guaranteed to ±10% of the frequency. Circuits constructed around the LM2574 use a standard series of inductors which are available from several different manufacturers. • 3.3V, 5V, 12V, and Adjustable Output Versions • Adjustable Version Output 1.23V to 37V ±4% Max. over Line and Load Conditions. • Guaranteed 0.5A Output Current • Wide Input Voltage, up to 40V • Thermal Shutdown and Current Limit Protection • Requires only 4 external Components. • Shutdown Capability (Standby Mode) • Low Power Standby Mode < 200µA Typical • High Efficiency • 52kHz Fixed Frequency Internal Oscillator • Uses Standard Inductors Applications • • • • Ordering Information Part Number Pin Configuration FB 1 8 SIG GND 2 7 OUTPUT ON/OFF 3 6 * PWR GND 4 5 VIN Simple High-efficiency Step-down (Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-card Switching Regulators Positive to Negative Converter (Buck-Boost) * Temp. Range Package LM2574BN –40°C to +85°C 8-pin Plastic DIP LM2574BWM –40°C to +85°C 14-pin Wide SOIC LM2574-3.3BN –40°C to +85°C 8-pin Plastic DIP LM2574-3.3BWM –40°C to +85°C 14-pin Wide SOIC LM2574-5.0BN –40°C to +85°C 8-pin Plastic DIP LM2574-5.0BWM –40°C to +85°C 14-pin Wide SOIC LM2574-12BN –40°C to +85°C 8-pin Plastic DIP LM2574-12BWM –40°C to +85°C 14-pin Wide SOIC Typical Application 8-pin DIP (N) 40V MAX UNREGULATED DC IN FB VIN * * FB SIG GND ON/OFF PWR GND * 1 2 3 4 5 6 7 14 13 12 11 10 9 8 CIN 22µF * * OUTPUT * VIN * * 330µH LM2574 PWR GND SIG GND OUT ON/ OFF 11DQ05 REGULATED OUTPUT 0.5A COUT 220µF 14-pin SOIC (WM) Figure 1. Fixed Output Regulator Circuit * NC: solder to printed circuit for maximum heat transfer Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com August 1999 1 LM2574 PDF
Документация на LM2574-12BWM 

Дата модификации: 30.03.2002

Размер: 47 Кб

8 стр.

    Товары серии LM2574

    Наименование i Упаковка Корпус Режим Uвх Uвых Опции
    LM2574-12BWM (MCRCH) TSSOP-14
    LM2574-12YN (MCRCH) 1 шт DIP8300
    LM2574-3.3BN (MCRCH)
     
    LM2574-3.3BWM (MCRCH) TSSOP-14
    LM2574-3.3YN (MCRCH) в линейках 146 шт DIP8300
    LM2574-5.0BN (MCRCH)
    LM2574-5.0BWM (MCRCH) TSSOP-14
    LM2574-5.0YN (MCRCH) 1 шт DIP8300
    LM2574BWM (MCRCH) TSSOP-14
    LM2574YN (MCRCH) DIP8300

    LM2574 публикации

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