Datasheet LT1941 (Analog Devices) - 3

LT1941
The ELECTRICAL CHARACTERISTICS
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN, VBIAS1, VBIAS2 = 5V, VBOOST1, VBOOST2 = 8V, unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Phase SW1 to SW2 150 180 210 Deg SW1 to SW3 –30 0 30 Deg Foldback Frequency VFB = 0V 200 kHz RUN/SS Current 1 2 3 μA RUN/SS Threshold 0.4 0.6 V 5GOOD Threshold VIN Rising 4.5 V 5GOOD Voltage Output Low I5GOOD = 125μA, VIN = 4V 0.2 0.4 V 5GOOD Leakage V5GOOD = 2V 10 400 nA 12GOOD Threshold VIN Rising 10.8 V 12GOOD Voltage Output Low I12GOOD = 125μA 0.2 0.4 V 12GOOD Leakage V12GOOD = 2V, VIN = 12V 10 400 nA PGOOD Voltage Output Low IPGOOD = 200μA 0.2 0.4 V PGOOD Pin Leakage VPGOOD = 2V 10 400 nA
3A Step-Down
FB1 Voltage 618 628 638 mV l 613 638 mV FB1 Pin Bias Current l 50 500 nA PGOOD1 Threshold Offset VFB Rising 54 mV Frequency Shift Threshold on FB1 0.35 V Error Amplifi er Transconductance 1700 μMhos Error Amplifi er Voltage Gain 500 V/V VC Switching Threshold 0.9 V VC1 to Switch Current Gain 5 A/V Switch 1 Current Limit (Note 3) VIN = 12V, VBOOST1, VBOOST2 = 15V l 3 4.3 6 A Switch 1 VCESAT (Note 7) ISW = 2.5A 400 600 mV BOOST1 Pin Current ISW = 2.5A 40 60 mA Switch 1 Leakage Current 0.01 10 μA Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V Maximum Duty Cycle l 78 88 %
2A Step-Down
FB2 Voltage 618 628 638 mV l 613 638 mV FB2 Pin Bias Current l 50 500 nA PGOOD2 Threshold Offset VFB Rising 54 mV Frequency Shift Threshold on FB2 0.35 V Error Amplifi er Transconductance 1700 μMhos Error Amplifi er Voltage Gain 500 V/V VC Switching Threshold 0.9 V VC2 to Switch Current Gain 3.6 A/V Switch 2 Current Limit (Note 3) VIN = 12V, VBOOST1, VBOOST2 = 15V l 2 2.9 4.1 A Switch 2 VCESAT (Note 7) ISW = 1.5A 450 600 mV BOOST2 Pin Current ISW = 1.5A 26 40 mA 1941fb 3