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LTC1574 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1574 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 8 page  3 LTC1574 LTC1574-3.3/LTC1574-5 ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IIL Shutdown Pin Input Current 0 ≤ VSHUTDOWN ≤ 0.8V 0.5 µA VF Schottky Diode Forward Voltage Forward Current = 200mA 0.450 0.570 V IR Schottky Reverse Current Reverse Voltage = 5V 10 25 µA Reverse Voltage = 18.5V 100 250 µA The q denotes specifications which apply over the full operating temperature range. Note 1: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TJ = TA + (PD × 110°C/W) Note 2: Guaranteed by Design. Note 3: Does not include Schottky reverse current. Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 4: Current into Pin 5 only, measured without electrolytic input capacitor. TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Input Voltage Efficiency vs Load Current Efficiency vs Load Current LOAD CURRENT (mA) 1 10 100 1574 • TPC01 500 100 90 80 70 60 50 L = 50 µH VOUT = 3.3V IPGM = VIN COIL = CTX50-4 VIN = 5V VIN = 9V LOAD CURRENT (mA) 1 10 100 1574 • TPC02 400 100 95 90 85 80 75 70 L = 50 µH VOUT = 5V IPGM = VIN COIL = CTX50-4 VIN = 6V VIN = 9V INPUT VOLTAGE (V) 5 7 9 10 14 1574 • TPC03 68 11 12 13 95 94 93 92 91 90 89 VOUT = 5V L = 100 µH COIL = CTX100-4 ILOAD = 300mA IPGM = VIN ILOAD = 100mA IPGM = 0V Switch Resistance vs Input Voltage Switch Leakage Current vs Temperature Efficiency Using Different Types of Inductor Core Material LOAD CURRENT (mA) 1 10 100 500 100 90 80 70 60 50 VIN = 5V VOUT = 3.3V IPGM = VIN CTX50-4 CTX50-4P 1574 • TPC04 TEMPERATURE ( °C) 0 180 160 140 120 100 80 60 40 20 0 40 80 100 1574 • TPC05 20 60 VIN = 13.5V INPUT VOLTAGE (V) 4 12 1574 • TPC06 6 8 10 14 16 18 20 TA = 25°C 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 |
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