LM2574-3.3YN Micrel Inc, LM2574-3.3YN Datasheet
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LM2574-3.3YN
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LM2574-3.3YN Summary of contents
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... LM2574 General Description The LM2574 family is a series of easy to use fixed and ad- justable 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 and 5V fixed output ver- sions adjustable version with an output voltage range of 1.23V to 37V. Output voltage is guaranteed to ± ...
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... LM2574 Ordering Information Part Number Standard Pb-Free LM2574BN LM2574YN LM2574-3.3BN LM2574-3.3YN LM2574-5.0BN LM2574-5.0YN Pin Configuration PWR GND 4 M9999-072805 Junction Temp. Range Package –40ºC to +85ºC 8-pin Plastic DIP –40ºC to +85ºC 8-pin Plastic DIP –40ºC to +85ºC ...
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... All limits at temperature extremes are guaranteed via testing. 3. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2574 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of “Electrical Charac- teristics.” ...
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... OUT OUT ON/OFF = 5V (OFF) ON/OFF = 0V (ON LM2574 330µH (adjustable) OUT PWR SI G ON/ GND GND OFF 11DQ06 Figure 2. Adjustable Regulator Test Circuit LM2574– C 330µ 22µF OUT ON/ GND GND 11DQ06 Figure 3. Fixed Regulator Test Circuit 4 Min Typ 0 0.7 1 ...
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... LM2574 Typical Characteristics (Circuit of Figure 1) Supply Current 20 Measured at Ground Pin 25˚ OUT = 0. INPUT VOLTAGE ( V) Current Limit 1 25V 1 0.5 0 -75 -50 - 100125 150 TEM PER ATU ˚ Minimum Operating Voltage 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 V OUT = 1.23V 1 100 mA 0.5 0 -75 -50 - 100125150 TEM PER ATU ˚ ...
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... LM2574 Typical Performance Characteristics (continued) Feedback Voltage -10 -15 -20 -25 -75 -50 - TEM PER ATU ˚ Adjustable version only M9999-072805 Normalized Feedback Voltage vs Duty Cycle 12V 100mA Normalized toT J = 25˚ -10 -15 - 100125150 100 40V 100 Micrel, Inc. July 2005 ...
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... LM2574 Block Diagrams INTERNAL REGULATOR F EED - 4 BACK FIXED GAIN 3.1k + COM PARAT OR 1. 1.23V BAND-GAP 52 kHz RESET REFERENCE OSCILLATOR SHUTDOWN Note: Pin numbers are for the TO-220 package Fixed Regulator July 2005 ON/OFF ON/OFF 1 F EED - 1/2 AMP 4 BACK SW ITCH DRIVER ...
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... LM2574 Package Information 0.018 (0.57) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...