Datasheet LT3744 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | High Current Synchronous Step-Down LED Driver |
| Páginas / Página | 32 / 5 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 782 Kb |
| Idioma del documento | Inglés |
e lecTrical characTerisTics The. denotes the specifications which apply over the full operating
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LT3744
e lecTrical 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 = 2V, SGND = VEE = 0V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Voltage Regulation Amplifier
FB Pin Current VFB = 1.2V 1.2 µA gm 600 μA/V Feedback Regulation Voltage l 1.169 1.205 1.241 V
LED Current Control Loop gm Amplifier
Input Bias Current (LED_ISP and LED_ISN) CTRL1 = 1.5V, PWM1 = 2V, PWM2, PWM3, LED_ISP 65 μA and LED_ISN = 0V Output Impedance 25 MΩ gm 200 μA/V Differential Gain 5 kV/V
C/10 Comparator
Falling Threshold LED_ISN = 0V, Threshold = LED_ISP-LED_ISN, 4.0 6 8.0 mV CTRL1 = CTRL2 = CTRL3 = 2V Rising Hysteresis LED_ISN = 0V, Threshold = LED_ISP-LED_ISN, 3.0 mV CTRL1 = CTRL2 = CTRL3 = 2V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings characterization and correlation with statistical process controls. The may cause permanent damage to the device. Exposure to any Absolute LT3744I is guaranteed to meet performance specifications over the –40°C Maximum Rating condition for an extended periods may affect device to 125°C operating junction temperature range. reliability and lifetime.
Note 3:
The minimum on and off times are guaranteed by design and are
Note 2:
The LT3744E is guaranteed to meet performance specifications not tested. from 0°C to 125°C junction temperature. Specifications over the –40°C
Note 4:
Do not apply a positive or negative voltage to INTVCC, RT, VREF, to 125°C operating junction temperature range are assured by design, SS, TG, BG, PWM_OUT1, PWM_OUT2, or PWM_OUT3 pins, otherwise permanent damage may occur. 3744fa For more information www.linear.com/LT3744 5 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 Typical Application Related Parts
e lecTrical 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 = 2V, SGND = VEE = 0V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Voltage Regulation Amplifier
FB Pin Current VFB = 1.2V 1.2 µA gm 600 μA/V Feedback Regulation Voltage l 1.169 1.205 1.241 V
LED Current Control Loop gm Amplifier
Input Bias Current (LED_ISP and LED_ISN) CTRL1 = 1.5V, PWM1 = 2V, PWM2, PWM3, LED_ISP 65 μA and LED_ISN = 0V Output Impedance 25 MΩ gm 200 μA/V Differential Gain 5 kV/V
C/10 Comparator
Falling Threshold LED_ISN = 0V, Threshold = LED_ISP-LED_ISN, 4.0 6 8.0 mV CTRL1 = CTRL2 = CTRL3 = 2V Rising Hysteresis LED_ISN = 0V, Threshold = LED_ISP-LED_ISN, 3.0 mV CTRL1 = CTRL2 = CTRL3 = 2V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings characterization and correlation with statistical process controls. The may cause permanent damage to the device. Exposure to any Absolute LT3744I is guaranteed to meet performance specifications over the –40°C Maximum Rating condition for an extended periods may affect device to 125°C operating junction temperature range. reliability and lifetime.
Note 3:
The minimum on and off times are guaranteed by design and are
Note 2:
The LT3744E is guaranteed to meet performance specifications not tested. from 0°C to 125°C junction temperature. Specifications over the –40°C
Note 4:
Do not apply a positive or negative voltage to INTVCC, RT, VREF, to 125°C operating junction temperature range are assured by design, SS, TG, BG, PWM_OUT1, PWM_OUT2, or PWM_OUT3 pins, otherwise permanent damage may occur. 3744fa For more information www.linear.com/LT3744 5 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 Typical Application Related Parts