Datasheet LT3796, LT3796-1 (Analog Devices) - 4

LT3796/LT3796-1
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Current Sense Amplifier (CSA)
Power Supply Voltage Range (VS) l 3 100 V CSA Input Voltage Common Mode Range l 2.5 100 V (VCSP and VCSN) CSOUT Maximum Output Current l 200 µA Input Voltage Offset (V(CSP-CSN)) VSNS = 100mV, VS = 48V (Note 5) l –3 0 3 mV CSP, CSN Input Bias Current RIN1 = RIN2 = 1k (Note 5) 100 nA CSP, CSN Input Current Offset RIN1 = RIN2 = 1k (Note 5) 0 nA VS Supply Current VS = 48V 80 µA Input Step Response ( to 50% of Output Step) ∆VSENSE = 100mV Step, RIN1 = RIN2 = 1k, ROUT = 5k 1 µs
Linear Regulator
INTVCC Regulation Voltage l 7.4 7.7 8 V Dropout (VIN– INTVCC) IINTVCC = –10mA, VIN = 6V 400 mV INTVCC Current Limit VIN = 100V, INTVCC = 6V 20 mA VIN = 12V, INTVCC = 6V 85 mA INTVCC Shutdown Bias Current if Externally EN/UVLO = 0V, INTVCC = 7V 10 µA Driven to 7V INTVCC Undervoltage Lockout 3.8 4 4.1 V INTVCC Undervoltage Lockout Hysteresis 150 mV
Oscillator
Switching Frequency RT = 82.5k l 85 105 125 kHz RT = 19.6k l 340 400 480 kHz RT = 6.65k l 900 1000 1150 kHz Minimum Off-Time (Note 6) 190 ns Minimum On-Time (Note 6) 210 ns
LOGIC Input/Outputs
PWM Input Threshold Rising l 0.96 1 1.04 V PWM Pin Bias Current 10 µA EN/UVLO Threshold Voltage Falling l 1.185 1.220 1.250 V EN/UVLO Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN Drops Below 1µA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 2.5 3 3.8 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.30V 40 200 nA VMODE OUTPUT Low IVMODE = 0.5mA 300 mV FAULT OUTPUT Low IFAULT = 0.5mA 300 mV SYNC Pin Resistance to GND LT3796 Only 40 kΩ SYNC Input Low Threshold LT3796 Only 0.4 V SYNC Input High Threshold LT3796 Only 1.5 V TGEN Pin Resistance to GND LT3796-1 Only 40 kΩ TGEN Input Low Threshold LT3796-1 Only 0.4 V TGEN Input High Threshold LT3796-1 Only 1.5 V 3796fb 4 For more information www.linear.com/3796 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