Datasheet LT3477 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense |
| Pages / Page | 22 / 3 — elecTrical characTerisTics. The. indicates specifications which apply … |
| File Format / Size | PDF / 585 Kb |
| Document Language | English |
elecTrical characTerisTics. The. indicates specifications which apply over the full operating
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LT3477
elecTrical characTerisTics The
l
indicates specifications which apply over the full operating temperature range, otherwise specifications 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 VSHDN = 0V 0.1 1.0 µA VSHDN = 2.5V, VC = 0.3V (Not Switching) 5.0 7.5 mA Reference Voltage E Grade l 1.216 1.235 1.250 V I Grade l 1.210 1.235 1.260 V Reference Voltage Line Regulation 2.5V < VIN < 25V, 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 Amplifier Offset Voltage FBP – FBN, VC = 1V –2 2 6 mV Feedback Amplifier Voltage Gain 500 V/V Voltage Feedback Amplifier Transconductance 500 µS Feedback Amplifier Sink Current VFBP = 1.25V, VFBN = 1.5V, VC = 1V 10 µA Feedback Amplifier Source Current VFBP = 1.25V, VFBN = 1V, VC = 0.5V 10 µA Current Sense Amplifier Sense Voltage Positive Rail, VCM = 25V, E Grade l 97.5 100 102.5 mV Positive Rail, VCM = 25V, I Grade l 97.5 100 103 mV Ground 88 100 112 mV Switching Frequency RT = 17.2k 0.9 1 1.15 MHz RT = 107.4k 160 200 240 kHz RT = 2.44k 2.7 3.5 4.3 MHz Maximum Switch Duty Cycle RT = 17.2k l 87 93 % Switch Current Limit (Note 3) 3 4 5 A Switch VCESAT ISW = 1A (Note 3) 150 200 mV Switch Leakage Current SW = 40V 0.2 5 µA SHDN Pin Current VSHDN = 5V 30 60 µA VSHDN = 0V 0.1 1 µA SHDN Pin Threshold 0.3 1.5 2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings junction temperature range are assured by design, characterization and may cause permanent damage to the device. Exposure to any Absolute correlation with statistical process controls. The LT3477I is guaranteed Maximum Rating condition for extended periods may affect device over the full –40°C to 125°C operating junction temperature range. reliability and lifetime.
Note 3:
Switch current limit and switch VCESAT for UF package guaranteed
Note 2:
The LT3477E is guaranteed to meet performance specifications by design and/or correlation to static test. from 0°C to 70°C. Specifications over the –40°C to 85°C operating 3477fd For more information www.linear.com/LT3477 3 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Package Description Typical Application Related Parts
elecTrical characTerisTics The
l
indicates specifications which apply over the full operating temperature range, otherwise specifications 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 VSHDN = 0V 0.1 1.0 µA VSHDN = 2.5V, VC = 0.3V (Not Switching) 5.0 7.5 mA Reference Voltage E Grade l 1.216 1.235 1.250 V I Grade l 1.210 1.235 1.260 V Reference Voltage Line Regulation 2.5V < VIN < 25V, 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 Amplifier Offset Voltage FBP – FBN, VC = 1V –2 2 6 mV Feedback Amplifier Voltage Gain 500 V/V Voltage Feedback Amplifier Transconductance 500 µS Feedback Amplifier Sink Current VFBP = 1.25V, VFBN = 1.5V, VC = 1V 10 µA Feedback Amplifier Source Current VFBP = 1.25V, VFBN = 1V, VC = 0.5V 10 µA Current Sense Amplifier Sense Voltage Positive Rail, VCM = 25V, E Grade l 97.5 100 102.5 mV Positive Rail, VCM = 25V, I Grade l 97.5 100 103 mV Ground 88 100 112 mV Switching Frequency RT = 17.2k 0.9 1 1.15 MHz RT = 107.4k 160 200 240 kHz RT = 2.44k 2.7 3.5 4.3 MHz Maximum Switch Duty Cycle RT = 17.2k l 87 93 % Switch Current Limit (Note 3) 3 4 5 A Switch VCESAT ISW = 1A (Note 3) 150 200 mV Switch Leakage Current SW = 40V 0.2 5 µA SHDN Pin Current VSHDN = 5V 30 60 µA VSHDN = 0V 0.1 1 µA SHDN Pin Threshold 0.3 1.5 2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings junction temperature range are assured by design, characterization and may cause permanent damage to the device. Exposure to any Absolute correlation with statistical process controls. The LT3477I is guaranteed Maximum Rating condition for extended periods may affect device over the full –40°C to 125°C operating junction temperature range. reliability and lifetime.
Note 3:
Switch current limit and switch VCESAT for UF package guaranteed
Note 2:
The LT3477E is guaranteed to meet performance specifications by design and/or correlation to static test. from 0°C to 70°C. Specifications over the –40°C to 85°C operating 3477fd For more information www.linear.com/LT3477 3 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Package Description Typical Application Related Parts
