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LM2574 데이터시트(PDF) 3 Page - Micrel Semiconductor |
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LM2574 데이터시트(HTML) 3 Page - Micrel Semiconductor |
3 / 8 page July 2005 3 M9999-072805 LM2574 Micrel, Inc. Absolute Maximum Ratings(1) Maximum Supply Voltage LM2574...................................................................... 45V OFF Pin Input Voltage ................................ –0.3V ≤ V ≤ VIN Output Voltage to Ground (Steady State)...................... –1V Power Dissipation..................................... Internally Limited Storage Temperature Range (TS)............. –65°C to +150°C Minimum ESD Rating C = 100pF, R = 1.5kΩ................................................ 2kV FB Pin........................................................................ 1kV Lead Temperature (soldering, 10 sec.)...................... 260°C Operating Ratings(1) Supply Voltage LM2574...................................................................... 40V Temperature Range LM2574...........................................–40°C ≤ TJ ≤ +125°C Maximum Junction Temperature (TJ.......................... 150°C Electrical Characteristics(2) Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN = 12V, and ILOAD = 100mA. Symbol Parameter Condition Min Typ Max Units System Parameters, Adjustable Regulators(3), Test Circuit Figure 2 VOUT Feedback Voltage VIN = 12V, ILOAD = 0.1A, VOUT = 5V 1.217 1.230 1.243 V VOUT Feedback Voltage 0.1A ≤ ILOAD ≤ 0.5A, 7V≤ VIN ≤ 40V, 1.193 1.230 1.267 V (LM2574) VOUT = 5V 1.180 1.280 V η Efficiency VIN = 12V, ILOAD = 0.1A, VOUT = 5V 78 % System Parameters, 3.3V Regulators(3), Test Circuit Figure 3 VOUT Output Voltage VIN = 12V, ILOAD = 0.1A, VOUT = 3.3V 3.234 3.3 3.366 V VOUT Output Voltage 0.1A ≤ ILOAD ≤ 0.5A, 4.75V ≤ VIN ≤ 40V, 3.168 3.3 3.432 V (LM2574-3.3) VOUT = 3.3V 3.135 3.465 V η Efficiency VIN = 12V, ILOAD = 0.1A 73 % System Parameters, 5V Regulators(3), Test Circuit Figure 3 VOUT Output Voltage VIN = 12V, ILOAD = 0.1A, VOUT = 5V 4.900 5.0 5.100 V VOUT Output Voltage 0.1A ≤ ILOAD ≤ 0.5A, 7V≤ VIN ≤ 40V, 4.800 5.0 5.200 V (LM2574-5.0) VOUT = 5V 4.750 5.250 V η Efficiency VIN = 12V, ILOAD = 0.1A, VOUT = 5V 78 % Notes: 1. “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. “Operating Ratings” indicate for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see “Electrical Charac- teristics.” 2. All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. 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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