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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3668 датащи(PDF) 3 Page - Linear Technology |
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LT3668 датащи(HTML) 3 Page - Linear Technology |
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3 / 28 page  LT3668 3 3668fa For more information www.linear.com/LT3668 The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4) PARAMETER CONDITIONS MIN TYP MAX UNITS VIN1 Undervoltage Lockout (Note 6) VIN2 = 0V, VIN3/BD = 0V l 4 4.3 V VIN1 Overvoltage Lockout l 40 42 44 V VIN2 Undervoltage Lockout (Note 6) VIN1 = 3.5V, VIN3/BD = 0V l 4 4.3 V Quiescent Current from IN1 VEN = 0.3V VEN = 12V, VIN2 = 0V, Not Switching l 0.01 13 1 30 µA µA Quiescent Current from IN2 VEN = 0.3V VEN = 12V, VIN1 = 0V, VIN2 = 5V l 0.01 38 1 80 µA µA Quiescent Current from IN1 + IN2 VEN = 0.3V, VIN2 = 5V VEN = 12V, VIN2 = 5V, Not Switching l 0.01 40 1 90 µA µA Quiescent Current from IN3/BD VEN = 0.3V, VIN3/BD = 5V VEN = 12V, VIN3/BD = 5V l 0.01 25 1 60 µA µA EN Pin Current VEN = 12V 0.6 2 µA EN Input Threshold 0.3 1.1 V Power Good Pin PG Leakage Current VPG = 5V 0.1 1 µA Output Voltage Low IPG = 40µA l 0.2 0.3 V Threshold as % of VFB1 Pin Voltage Falling Pin Voltage Rising 88 108 90 110 92 112 % % PG Threshold Hysteresis Measured at FB1 Pin 30 mV Switching Regulator Switching Frequency RT = 37.4k RT = 102k RT = 487k l l l 1.8 0.8 220 2.0 0.94 243 2.1 1.1 300 MHz MHz kHz Minimum Switch Off-Time l 120 190 ns Switch Current Limit (Note 7) 5% Duty Cycle, VIN = 5V, VFB1 = 0V 90% Duty Cycle, VIN = 5V, VFB1 = 0V l l 600 450 750 550 950 800 mA mA Switch VCESAT ISW = 200mA 300 mV DA Pin Current to Stop Switching l 420 500 650 mA Switch Leakage Current VSW = 0V 0.05 2 µA Boost Schottky Diode Forward Voltage IBOOSTDIODE = 50mA, VIN = NC, VBOOST = 0V 900 mV Boost Schottky Diode Reverse Leakage VREVERSE = 12V, VIN = NC 0.04 4 µA Minimum Boost Voltage (Note 8) l 1.7 2.5 V BOOST Pin Current ISW = 200mA, VBOOST = 15V 10 16 mA Feedback Voltage (FB1) l 1.188 1.176 1.2 1.2 1.212 1.224 V mV FB1 Pin Bias Current Pin Voltage = 1.2V l 0.1 20 nA Reference Voltage Line Regulation 4.2V < VIN1 < 40V 0.001 0.005 %/V Each LDO Regulator Minimum Input Voltage ILOAD = 200mA l 1.6 2.2 V Output Voltage Range l 1.1 10 V Tracking Error VOUT2/3-VADJ2/3 1.1V ≤ VADJ2/3 ≤ 5V, ILOAD = 1mA – 40°C to 125°C 5V < VADJ2/3 ≤ 10V, ILOAD = 1mA – 40°C to 125°C l l –6 –20 6 50 mV mV 1.1V ≤ VADJ2/3 ≤ 5V, ILOAD = 1mA – 40°C to 150°C 5V < VADJ2/3 ≤ 10V, ILOAD = 1mA – 40°C to 150°C l l –6 –20 15 80 mV mV ELECTRICAL CHARACTERISTICS |
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