Datasheet LT3741, LT3741-1 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | High Power, Constant Current, Constant Voltage, Step-Down Controller |
| Páginas / Página | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 639 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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Versión de texto del documento
LT3741/LT3741-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V, VSYNC = 0V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range l 6 36 V VIN Pin Quiescent Current (Note 2) Non-Switching Operation Not Switching 1.8 2.5 mA Shutdown Mode VEN/UVLO = 0V, RT = 40kΩ l 0.1 1 µA EN/UVLO Pin Falling Threshold 1.49 1.55 1.61 V EN/UVLO Hysteresis 130 mV EN/UVLO Pin Current VIN = 6V, EN/UVLO = 1.45V 5.5 µA SYNC Pin Threshold 1 V CTRL1 Pin Control Range 0 1.5 V CTRL1 Pin Current CTRL1 = 1.5V –100 nA
Reference
Reference Voltage (VREF Pin) l 1.94 2 2.06 V
Inductor Current Sensing
Full Range SENSE+ to SENSE– VCTRL1 = 1.5V l 48 51 54 mV SENSE+ Pin Current V + SENSE = 6V 50 nA SENSE– Pin Current With V – OUT ~ 4V, VCTRL1 = 0V, VSENSE = 6V 10 µA
Internal VCC Regulator (VCC_INT Pin)
Regulation Voltage l 4.7 5 5.2 V
NMOS FET Driver
Non-Overlap time HG to LG (Note 3) 100 ns Non-Overlap time LG to HG (Note 3) 60 ns Minimum On-Time LG (Note 3) 50 ns Minimum On-Time HG (Note 3) 80 ns Minimum Off-Time LG (Note 3) 65 ns High Side Driver Switch On-Resistance VCBOOT – VSW = 5V Gate Pull Up 2.3 Ω Gate Pull Down 1.3 Ω Low Side Driver Switch On-Resistance VCC_INT = 5V Gate Pull Up 2.3 Ω Gate Pull Down 1 Ω
Switching Frequency
fSW RT = 40kΩ l 900 1000 1070 kHz RT = 200kΩ 185 200 233 kHz
Soft-Start
Charging Current 11 µA
Voltage Regulation Amplifier
Input Bias Current FB = 1.3V 850 nA gm 800 µA/V Feedback Regulation Voltage CTRL1 = 1.5V, I – + SENSE = 23µA, VSENSE = 2V l 1.192 1.21 1.228 V 37411fg For more information www.linear.com/LT3741 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V, VSYNC = 0V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range l 6 36 V VIN Pin Quiescent Current (Note 2) Non-Switching Operation Not Switching 1.8 2.5 mA Shutdown Mode VEN/UVLO = 0V, RT = 40kΩ l 0.1 1 µA EN/UVLO Pin Falling Threshold 1.49 1.55 1.61 V EN/UVLO Hysteresis 130 mV EN/UVLO Pin Current VIN = 6V, EN/UVLO = 1.45V 5.5 µA SYNC Pin Threshold 1 V CTRL1 Pin Control Range 0 1.5 V CTRL1 Pin Current CTRL1 = 1.5V –100 nA
Reference
Reference Voltage (VREF Pin) l 1.94 2 2.06 V
Inductor Current Sensing
Full Range SENSE+ to SENSE– VCTRL1 = 1.5V l 48 51 54 mV SENSE+ Pin Current V + SENSE = 6V 50 nA SENSE– Pin Current With V – OUT ~ 4V, VCTRL1 = 0V, VSENSE = 6V 10 µA
Internal VCC Regulator (VCC_INT Pin)
Regulation Voltage l 4.7 5 5.2 V
NMOS FET Driver
Non-Overlap time HG to LG (Note 3) 100 ns Non-Overlap time LG to HG (Note 3) 60 ns Minimum On-Time LG (Note 3) 50 ns Minimum On-Time HG (Note 3) 80 ns Minimum Off-Time LG (Note 3) 65 ns High Side Driver Switch On-Resistance VCBOOT – VSW = 5V Gate Pull Up 2.3 Ω Gate Pull Down 1.3 Ω Low Side Driver Switch On-Resistance VCC_INT = 5V Gate Pull Up 2.3 Ω Gate Pull Down 1 Ω
Switching Frequency
fSW RT = 40kΩ l 900 1000 1070 kHz RT = 200kΩ 185 200 233 kHz
Soft-Start
Charging Current 11 µA
Voltage Regulation Amplifier
Input Bias Current FB = 1.3V 850 nA gm 800 µA/V Feedback Regulation Voltage CTRL1 = 1.5V, I – + SENSE = 23µA, VSENSE = 2V l 1.192 1.21 1.228 V 37411fg For more information www.linear.com/LT3741 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts