Datasheet LT3964 (Analog Devices) - 3

LT3964
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V, VEN/UVLO = 5V, CTRL1 = CTRL2 = 2V, PWM1 = PWM2 = 2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN1, VIN2 Operating Supply Range l 4 36 V VIN1 Pin Quiescent Current Not Switching 2.5 mA VIN1 Pin Shutdown Current EN/UVLO = 1.15V, PWM1,2 = 0V 200 µA EN/UVLO = 0V 1 µA VIN2 Pin Quiescent Current Not Switching 1 10 µA VIN2 Pin Shutdown Current EN/UVLO = 1.15V, PWM1,2 = 0V 1 µA EN/UVLO = 0V 1 µA EN/UVLO Threshold Voltage Falling l 1.158 1.18 1.202 V EN/UVLO Rising Hysteresis 60 mV EN/UVLO Input Low Voltage 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 4 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.3V 2 100 nA
Linear Regulator
INTVCC Regulation Voltage IINTVCC = –30mA, Non Switching l 3.9 4 4.1 V INTVCC Line Regulation 6V ≤ VIN1 ≤ 40V 0.03 %/V INTVCC Load Regulation –30mA ≤ IINTVCC ≤ 0mA 0.03 %/mA INTVCC Undervoltage Lockout 3.1 3.2 3.3 V INTVCC Undervoltage Lockout Hysteresis 50 mV INTVCC Current Limit VIN1 = 12V, VINTVCC = 3V 110 mA Dropout (VIN1 – VINTVCC) VIN1 = 4V, IINTVCC = –20mA, Not Switching 300 mV
Error Amplifier
Full Scale LED Current Sense Threshold ISP1,2 = 24V, CTRL1,2 = 1.5V, ADIM1,2[7:0] = 0xFF l 97 100 103 mV (V(ISP1-ISN1), V(ISP2-ISN2)) ISP1,2 = 0V, CTRL1,2 = 1.5V, ADIM1,2[7:0] = 0xFF l 96 100 104 mV 1/2 Scale LED Current Sense Threshold ISP1,2 = 24V, CTRL1,2 = 0.7V, ADIM1,2[7:0] = 0xFF l 47 50 53 mV (V(ISP1-ISN1), V(ISP2-ISN2)) ISP1,2 = 0V, CTRL1,2 = 0.7V, ADIM1,2[7:0] = 0xFF l 46 50 54 mV 1/4th Scale LED Current Sense Threshold ISP1,2 = 24V, CTRL1,2 = 0.7V, ADIM1,2[7:0] = 0x7F l 22 25 28 mV (V(ISP1-ISN1), V(ISP2-ISN2)) Modulated by ISP1,2 = 0V, CTRL1,2 = 0.7V, ADIM1,2[7:0] = 0x7F l 21 25 29 mV I2C Input ADIM1,2[7:0] 1/10th Scale LED Current Sense ISP1,2 = 24V, CTRL1,2 = 0.3V, ADIM1,2[7:0] = 0xFF l 7 10 13 mV Threshold (V(ISP1-ISN1), V(ISP2-ISN2)) ISP1,2 = 0V, CTRL1,2 = 0.3V, ADIM1,2[7:0] = 0xFF l 6 10 14 mV ISP1,2/ISN1,2 Overcurrent Protection ISP1,2 = 24V 930 mV Threshold (V(ISP1-ISN1), V(ISP2-ISN2)) C/10 Current Sense Threshold ISP1,2 = 24V 6 10 15 mV (V(ISP1-ISN1), V(ISP2-ISN2)) ISP1,2 = 0V 6 11 16 mV ISP1, ISP2 Input Current Bias Current PWM1,2 = 2V (ACTIVE) 350 µA PWM1,2 = 0V (STANDBY) 5 8 µA ISN1, ISN2 Input Current Bias Current PWM1,2 = 2V (ACTIVE) 30 µA PWM1,2 = 0V (STANDBY) 10 nA CTRL1, CTRL2 Input Bias Current VCTRL1, VCTRL2 = 1V 20 200 nA CTRL1, CTRL2 PWM Shutdown Threshold l 100 150 mV CTRL1, CTRL2 PWM Threshold Hysteresis 30 mV FB1, FB2 Regulation Voltage (VFB) ISP1,2 = 24V l 1.163 1.18 1.197 V 1.17 1.18 1.19 V FB1, FB2 Overvoltage Threshold VFB + 43mV VFB + 53mV VFB + 63mV V 3964fb For more information www.linear.com/LT3964 3