Datasheet LT1943 (Analog Devices) - 3

LT1943
ELECTRICAL CHARACTERISTICS The
●
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 ● 1.22 1.27 V FB1 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB1 Pin Bias Current (Note 4) ● 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% (Note 6) ● 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 (Note 7) 1.8 2.5 V BOOST Pin Current ISW = 1.5A 30 50 mA Maximum Duty Cycle (SW1) ● 82 92 %
SWITCH 2 (2.6A BOOST)
FB2 Voltage 1.23 1.25 1.27 V ● 1.22 1.27 V FB2 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB2 Pin Bias Current (Note 4) ● 220 1000 nA Error Amplifier 2 Voltage Gain 200 V/V Error Amplifier 2 Transconductance ∆I = 5µA 450 µmhos Switch 2 Current Limit ● 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) ● 85 92 %
SWITCH 3 (350mA BOOST)
FB3 Voltage 1.23 1.25 1.27 V ● 1.22 1.27 V FB3 Voltage Line Regulation 4.5V < VIN < 22V 0.01 0.03 %/V FB3 Pin Bias Current (Note 4) ● 100 600 nA Error Amplifier 3 Voltage Gain 200 V/V Error Amplifier 3 Transconductance ∆I = 5µA 450 µmhos Switch 3 Current Limit ● 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 % ● 83 % Schottky Diode Drop I = 170mA 700 mV 1943fa 3