Datasheet LT3743 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Current Synchronous Step-Down LED Driver with Three-State Control |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 535 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT3743
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, VCTRL_SEL = 0V, VPWM = 2V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 6 36 V VIN Pin Quiescent Current (Note 3) Non-Switching Operation VPWM = VCTRL_SEL = 0V, Not Switching, RT = 40k 1.8 2.5 mA Shutdown Mode VEN/UVLO = 0V 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 PWM Pin Threshold 1.0 V CTRL_SEL Threshold 1.0 V SYNC Pin Threshold 1.0 V CTRL_H and CTRL_L Pin Control Range 0 1.5 V CTRL_H and CTRL_L Pin Current 100 nA
Reference
Reference Voltage (VREF Pin) l 1.96 2 2.04 V
Inductor Current Sensing
Full Range SENSE+ to SENSE– V – CTRL_H = 1.5V, VSENSE = 6V l 48 51 54 mV SENSE+ Pin Current V + – SENSE = VSENSE = 6V 50 nA SENSE– Pin Current V + – SENSE = VSENSE = 6V 10 µA
Internal VCC Regulator (VCC_INT Pin)
Regulation Voltage l 4.7 5 5.2 V
NMOS FET Driver (Note 2)
Non-Overlap time HG to LG 100 ns Non-Overlap time LG to HG 60 ns Minimum On-Time LG (Note 3) 50 ns Minimum On-Time HG (Note 3) 80 ns Minimum Off-Time LG (Note 3) 60 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 2.5 Ω Gate Pull Down 1.3 Ω
Switching Frequency
fSW RT = 40kΩ l 900 1000 1070 kHz RT = 200kΩ 190 200 233 kHz
Soft-Start
Charging Current 5.5 µA
Voltage Regulation Amplifier
Input Bias Current 1 nA gm 200 µA/V Feedback Regulation Voltage V + CTRL_H = 0V, VCTRL_L = 2V, VSENSE = 2V l 0.945 1 1.025 V 3743fe For more information www.linear.com/LT3743 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 Package Description Revision History 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, VCTRL_SEL = 0V, VPWM = 2V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 6 36 V VIN Pin Quiescent Current (Note 3) Non-Switching Operation VPWM = VCTRL_SEL = 0V, Not Switching, RT = 40k 1.8 2.5 mA Shutdown Mode VEN/UVLO = 0V 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 PWM Pin Threshold 1.0 V CTRL_SEL Threshold 1.0 V SYNC Pin Threshold 1.0 V CTRL_H and CTRL_L Pin Control Range 0 1.5 V CTRL_H and CTRL_L Pin Current 100 nA
Reference
Reference Voltage (VREF Pin) l 1.96 2 2.04 V
Inductor Current Sensing
Full Range SENSE+ to SENSE– V – CTRL_H = 1.5V, VSENSE = 6V l 48 51 54 mV SENSE+ Pin Current V + – SENSE = VSENSE = 6V 50 nA SENSE– Pin Current V + – SENSE = VSENSE = 6V 10 µA
Internal VCC Regulator (VCC_INT Pin)
Regulation Voltage l 4.7 5 5.2 V
NMOS FET Driver (Note 2)
Non-Overlap time HG to LG 100 ns Non-Overlap time LG to HG 60 ns Minimum On-Time LG (Note 3) 50 ns Minimum On-Time HG (Note 3) 80 ns Minimum Off-Time LG (Note 3) 60 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 2.5 Ω Gate Pull Down 1.3 Ω
Switching Frequency
fSW RT = 40kΩ l 900 1000 1070 kHz RT = 200kΩ 190 200 233 kHz
Soft-Start
Charging Current 5.5 µA
Voltage Regulation Amplifier
Input Bias Current 1 nA gm 200 µA/V Feedback Regulation Voltage V + CTRL_H = 0V, VCTRL_L = 2V, VSENSE = 2V l 0.945 1 1.025 V 3743fe For more information www.linear.com/LT3743 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 Package Description Revision History 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
