Datasheet LT3479 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 256 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
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LT3479
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage l 2.3 2.5 V Quiescent Current VIN = 2.5V, VSHDN = 0V 0.1 1 μA VIN = 2.5V, VSHDN = 2.5V, VC = 0.3V (Not Switching) 5 7.5 mA Reference Voltage Measured at VREF Pin l 1.216 1.235 1.250 V Reference Voltage Line Regulation 2.5V < VIN < 24V, VC = 0.3V 0.01 0.03 %/V Maximum VREF Pin Current Out of Pin 100 μA Soft-Start Pin Current SS = 0.5V, Out of Pin 9 μA FBP Pin Bias Current 25 100 nA FBN Pin Bias Current 25 100 nA Feedback Amplifi er Offset Voltage FBP – FBN, VC = 1V –2 2 6 mV Feedback Amplifi er Voltage Gain 250 V/V Feedback Amplifi er Transconductance 150 μS Feedback Amplifi er Sink Current VFBP = 1.25V, VFBN = 1.5V, VC = 0.5V 10 μA Feedback Amplifi er Source Current VFBP = 1.25V, VFBN = 1V, VC = 0.5V 10 μA Switching Frequency RT = 17.8k 0.9 1 1.15 MHz RT = 113k 160 200 240 kHz RT = 1.78k 2.7 3.5 4.1 MHz Maximum Switch Duty Cycle RT = 17.8k l 84 93 % SHDN Pin Current VSHDN = 5V 30 60 μA VSHDN = 0V 0.1 1 μA SHDN Pin Threshold 0.3 1.5 2 V Inductor Current Limit (Note 3) 3.5 5 6.5 A Switch Current Limit (Note 3) 3 4.5 6 A Switch VCESAT ISW = 1A (Note 3) 120 200 mV Switch Leakage Current SW = 40V 0.2 5 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range are assured by design, characterization and correlation may cause permanent damage to the device. Exposure to any Absolute with statistical process controls. Maximum Rating condition for extended periods may affect device
Note 3:
Inductor Current Limit, Switch Current Limit and Switch VCESAT for reliability and lifetime. DE package guaranteed by design and/or correlation to static test.
Note 2:
The LT3479 is guaranteed to meet performance specifi cations from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating 3479fc 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage l 2.3 2.5 V Quiescent Current VIN = 2.5V, VSHDN = 0V 0.1 1 μA VIN = 2.5V, VSHDN = 2.5V, VC = 0.3V (Not Switching) 5 7.5 mA Reference Voltage Measured at VREF Pin l 1.216 1.235 1.250 V Reference Voltage Line Regulation 2.5V < VIN < 24V, VC = 0.3V 0.01 0.03 %/V Maximum VREF Pin Current Out of Pin 100 μA Soft-Start Pin Current SS = 0.5V, Out of Pin 9 μA FBP Pin Bias Current 25 100 nA FBN Pin Bias Current 25 100 nA Feedback Amplifi er Offset Voltage FBP – FBN, VC = 1V –2 2 6 mV Feedback Amplifi er Voltage Gain 250 V/V Feedback Amplifi er Transconductance 150 μS Feedback Amplifi er Sink Current VFBP = 1.25V, VFBN = 1.5V, VC = 0.5V 10 μA Feedback Amplifi er Source Current VFBP = 1.25V, VFBN = 1V, VC = 0.5V 10 μA Switching Frequency RT = 17.8k 0.9 1 1.15 MHz RT = 113k 160 200 240 kHz RT = 1.78k 2.7 3.5 4.1 MHz Maximum Switch Duty Cycle RT = 17.8k l 84 93 % SHDN Pin Current VSHDN = 5V 30 60 μA VSHDN = 0V 0.1 1 μA SHDN Pin Threshold 0.3 1.5 2 V Inductor Current Limit (Note 3) 3.5 5 6.5 A Switch Current Limit (Note 3) 3 4.5 6 A Switch VCESAT ISW = 1A (Note 3) 120 200 mV Switch Leakage Current SW = 40V 0.2 5 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range are assured by design, characterization and correlation may cause permanent damage to the device. Exposure to any Absolute with statistical process controls. Maximum Rating condition for extended periods may affect device
Note 3:
Inductor Current Limit, Switch Current Limit and Switch VCESAT for reliability and lifetime. DE package guaranteed by design and/or correlation to static test.
Note 2:
The LT3479 is guaranteed to meet performance specifi cations from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating 3479fc 3
