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LM2574

0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator

TheLM2574seriesofregulatorsaremonolithicintegratedcircuitsideallysuitedforeasyandconvenientdesignofastep?downswitchingregulator(buckconverter).Allcircuitsofthisseriesarecapableofdrivinga0.5Aloadwithexcellentlineandloadregulation. Thesedevicesareavailabl

LM2574

52kHz Simple 0.5A Buck Regulator

GeneralDescription TheLM2574familyisaseriesofeasytousefixedandadjustableswitchingvoltageregulators.TheLM2574containsalloftheactivecircuitrynecessarytoconstructastepdown(buck)switchingregulatorandrequiresaminimumofexternalcomponents. Features ?3.3V,5V,12

LM2574

40V, 0.5A, 52kHz, STEP-DOWN SWITCHING REGULATOR; - 3.3V, 5.0V, 12V and Adjustable Output Versions\n- Adjustable Version Output Voltage Range\n- Wide Input Voltage Range\n- Guaranteed 0.5A Output Current\n- 52kHz Fixed Frequency Internal Oscillator\n- Voltage mode non-synchronous PWM control\n- On/Off shutdown control input\n- Thermal Shutdown and Current Limit Protection\n- Moisture Sensitivity Level 3 for SMD packages;

The LM2574 series are monolithic ICs designed for a step-down DC/DC converter, capable of driving 0.5A load without an additional transistor. \nIt saves a board space. The external shutdown function is controlled by a logic level and then the circuit comes into the standby mode. \nThe internal compensation makes the feedback control with good line and load regulation characteristics without an external design.\nRegarding the protection functions - the thermal shutdown prevents circuit damage during the over temperature operation and the current limit is against overcurrent operation of the output switch.Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency.External shutdown is included, featuring 50 uA (typical) standby current. \nThe fixed output voltage version includes 3.3V, 5V, 12V devices, while the adjustable version voltages range from 1.23V to 37V. The LM2574 is available in DIP-8 and SOP-14 package.

LM2574

0.5A Step-Down SMPS Regulator; 3.3V, 5V, 12V, and adjustable output versions \nAdjustable version output 1.23V to 37V ±4% Max. over Line and Load conditions. \nGuaranteed 0.5A output current \nWide input voltage, up to 40V \nThermal shutdown and current limit protection \nRequires only 4 external components. \nShutdown capability (standby mode) \nLow power standby mode High efficiency \n52kHz fixed frequency internal oscillator \nUses standard inductors;

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-by-cycle 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.

LM2574

降壓穩(wěn)壓器，開關(guān)，可調(diào)輸出電壓，0.5 A; ? 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions\n? Adjustable Version Output Voltage Range of 1.23 V to 37 V +/-4%\n? Guaranteed 0.5 A Output Current\n? Wide Input Voltage Range: 4.75 V to 40 V\n? Requires Only 4 External Components\n? 52 kHz Fixed Frequency Internal Oscillator\n? TTL Shutdown Capability, Low Power Standby Mode\n? High Efficiency\n? Uses Readily Available Standard Inductors\n? Thermal Shutdown and Current Limit Protection\n? Moisture Sensitivity Level (MSL) Equals 1\n;

The LM2574 Buck Switching Regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 0.5 A loadwith excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version. The Buck Switching Regulator is designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2574 are offered by several different inductor manufacturers. Since the LM2574 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated by the LM2574 regulator is so low, that no heatsink is required or its size could be reduced dramatically. The LM2574 features include a guaranteed 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-10%on the oscillator frequency (+/-2% over 0C to 125C). External shutdown is included, featuring 80 uA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

LM2574

SIMPLE SWITCHER??0.5A Step-Down Voltage Regulator

LM2574

52KHZ SIMPLE 0.5A BUCK REGULATOR

LM2574

0.5 A, Adjustable Output Voltage, Step??own Switching Regulator

LM2574

AC-DC Offline Switching Controllers/Regulators

LM2574

LM2574/LM2574HV SIMPLE SWITCHER??0.5A Step-Down Voltage Regulator