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LT1943EFE Datasheet(PDF) 3 Page - Linear Technology |
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LT1943EFE Datasheet(HTML) 3 Page - Linear Technology |
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3 / 12 page  LT1943 3 1943i ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS SWITCH 1 (2.4A BUCK) FB1 Voltage 1.23 1.25 1.27 V q 1.22 1.27 V FB1 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB1 Pin Bias Current (Note 4) q 100 600 nA Error Amplifier 1 Voltage Gain 200 V/V Error Amplifier 1 Transconductance ∆I = 5µA 450 µmhos Switch 1 Current Limit Duty Cycle = 35% q 2.4 3.2 4.3 A Switch 1 VCESAT ISW = 2A 310 470 mV Switch 1 Leakage Current FB1 = 1.5V 0.1 10 µA Minimum BOOST Voltage Above SW1 Pin ISW = 1.5A 1.8 2.5 V BOOST Pin Current ISW = 1.5A 30 50 mA Maximum Duty Cycle (SW1) q 82 92 % SWITCH 2 (2.6A BOOST) FB2 Voltage 1.23 1.25 1.27 V q 1.22 1.27 V FB2 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB2 Pin Bias Current (Note 4) q 220 1000 nA Error Amplifier 2 Voltage Gain 200 V/V Error Amplifier 2 Transconductance ∆I = 5µA 450 µmhos Switch 2 Current Limit q 2.6 3.8 4.9 A Switch 2 VCESAT ISW2 = 2A 360 540 mV Switch 2 Leakage Current FB2 = 1.5V 0.1 1 µA BIAS Pin Current ISW2 = 2A 45 mA Maximum Duty Cycle (SW2) q 85 92 % SWITCH 3 (350mA BOOST) FB3 Voltage 1.23 1.25 1.27 V q 1.22 1.27 V FB3 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB3 Pin Bias Current (Note 4) q 100 600 nA Error Amplifier 3 Voltage Gain 200 V/V Error Amplifier 3 Transconductance ∆I = 5µA 450 µmhos Switch 3 Current Limit q 0.35 0.5 0.7 A Switch 3 VCESAT ISW3 = 0.2A 180 280 mV Switch 3 Leakage Current FB3 = 1.5V 0.1 1 µA BIAS Pin Current ISW3 = 0.2A 14 mA Maximum Duty Cycle (SW3) 84 88 % q 83 % Schottky Diode Drop I = 170mA 700 mV |
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