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SC2440EVB Datasheet(PDF) 3 Page - Semtech Corporation |
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SC2440EVB Datasheet(HTML) 3 Page - Semtech Corporation |
3 / 26 page 3 © 2005 Semtech Corp. www.semtech.com SC2440 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: -40°C < T A < 85°C, -40°C < TJ< 105°C, ROSC = 12.1KΩ, VSYNC = 0, VIN = 5V, VBOOST = 8V Parameter Conditions Min Typ Max Units COMP Switching Threshold 0.7 1.1 1.3 V COMP Maximum Voltage V FB = 0.9V 2.2 V Channel Switching Frequecy 1.2 1.4 1.6 MHz Maximum Duty Cycle (Note 2) 80 90 % Switch Current Limit V FB = 0.9V, VSS = 2.3V, COMP Pin Open 2 2.6 A Switch Saturation Voltage I SW = -2A 0.3 0.48 V Switch Leakage Current 10 µA Minimum Boost Voltage I SW = -2A 1.8 2.5 V Boost Pin Current I SW = -0.5A 20 30 mA I SW = -2A 60 80 mA Minimum Soft-Start Voltage to Exit Shutdown SS1 Tied to SS2 0.2 0.4 0.7 V Soft-start Charging Current V SS = 0V 2 µA V SS = 1.5V 1.8 µA Soft-start Discharging Current V SS = 1.5V 0.8 µA Minimum Soft-start Voltage to Enable Overload Shutoff V SS Rising 2 V FB Overload Threshold V SS = 2.3V, VFB Falling 0.74 V Soft-start Voltage to Restart Switching After Overload Shutoff V SS Falling 0.7 1 1.3 V Power Good Threshold Below FB V FB Rising 80 100 120 mV Power Good Output Low Voltage V FB = 0.8V, IPGOOD = 250µA 0.2 0.4 V Power Good Pin Leakage Current V PGOOD = 5V 0.1 1 µA SYNC Input High Voltage 2 V SYNC Input Low Voltage (Note 1) 0.8 V SYNC Frequency SYNC Frequency = 2 X Channel Frequency. (Note 1) 3.4 5 MHz SYNC Pin Input Current V SYNC = 2V 60 75 µA Thermal Shutdown Temperature 155 °C Thermal Shutdown Hysteresis 10 °C Notes: (1) Guaranteed by design, not tested in production. (2) The maximum duty cycle specified corresponds to 1.4MHz switching frequency. Duty cycles higher than those specified can be achieved by lowering the operating frequency. (3) This device is ESD sensitive. Use of standard ESD handling precautions is required. |
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