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LM2574-3.3BWM Scheda tecnica(PDF) 4 Page - Micrel Semiconductor |
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LM2574-3.3BWM Scheda tecnica(HTML) 4 Page - Micrel Semiconductor |
4 / 5 page LM2574 Micrel M9999-122303 4 December 2003 Electrical Characteristics Symbol Parameter Condition Min Typ Max Units Device Parameters, Adjustable Regulator I B Feedback Bias Current V OUT = 5V 50 100 nA 500 nA Device Parameters, Fixed and Adjustable Regulators f o Oscillator Frequency Note 8 47 52 58 kHz 42 63 kHz V SAT Saturation Voltage I OUT = 0.5A (4) 0.8 1.2 V 1.4 V DC Max Duty Cycle (ON) Note 5 93 98 % I CL Current Limit Peak Current, t ON ≤ 3µs (4) 0.7 1.0 1.6 A 0.65 1.8 I L Output Leakage Current V IN, Note 6, Output = 0V 2 mA Note 6, Output = –1V 7.5 30 I Q Quiescent Current Note 6 510 mA I STBY Standby Quiescent Current ON/OFF Pin = 5V (OFF) 50 200 µA θ JA Thermal Resistance N Package, Junction to Ambient(7) 85 °C/W On/Off Control, Fixed and Adjustable Regulators Test Circuit Figures 2, 3 V IH ON/OFF Input Level V OUT = 0V 2.2 1.4 V 2.4 V V IL ON/OFF Input Level V OUT = 5V 1.2 1.0 V 0.8 V I IH ON/OFF Logic Current ON/OFF = 5V (OFF) 4 30 µA I IL ON/OFF Logic Current ON/OFF = 0V (ON) 0.01 10 µA Notes: 4. Output (pin 2) sourcing current. No diode, inductor, or capacitor connected to input. 5. Feedback (pin 4) removed from output and connected to 0V. 6. Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF. 7. Junction-to-ambient thermal resistance with approximately 1 square inches of PC board copper surrounding the leads. Test Circuit VIN PWR GND SIG GND ON/ OFF OUT FB LM2574 (adjustable) CIN 22µF 11DQ06 COUT 220µF 330µH 3.09k 1k Figure 2. Adjustable Regulator Test Circuit VIN PWR GND SIG GND ON/ OFF OUT FB LM2574– 3.3, 5 CIN 22 µF 11DQ06 COUT 220 µF 330 µH Figure 3. Fixed Regulator Test Circuit |
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