Datasheet LT3791-1 (Analog Devices) - 7

LT3791-1
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. C/10 Threshold vs Temperature OVLO Threshold vs Temperature Soft-Start Current vs Temperature
1.200 3.3 16 1.175 3.2 14 CHARGING RISING 1.150 3.1 12 RISING 1.125 3.0 10 FALLING 1.100 2.9 FALLING (µA) 8 I SS FB VOLTAGE (V) 1.075 2.8 6 OVLO THRESHOLD (V) 1.050 2.7 4 1.025 2.6 2 DISCHARGING 1.000 2.5 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 37911 G19 37911 G20 37911 G21
Supply Current vs Input Voltage EN/UVLO Pin Current EN/UVLO Threshold Voltage
4.0 8 1.30 VEN/ULO = 1V 3.5 7 1.28 1.26 3.0 6 1.24 2.5 5 1.22 RISING (mA) 2.0 4 1.20 I Q 1.5 3 1.18 FALLING 1.16 1.0 EN/UVLO PIN CURRENT (µA) 2 EN/UVLO THRESHOLD (V) T 1.14 A = 150°C 0.5 TA = 25°C 1 1.12 TA = –50°C 0 0 1.10 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 VIN (V) TEMPERATURE (°C) TEMPERATURE (°C) 37911 G22 37911 G23 37911 G24
Oscillator Frequency TG1, TG2 Minimum On-Time TG1, TG2 Minimum Off-Time vs Temperature vs Temperature vs Temperature
800 100 350 TG2 700 90 R 300 T = 29.1k fSW = 200kHz 600 80 TG1 250 f 500 SW = 400kHz 70 RT = 59.0k 200 400 60 f 150 SW = 700kHz 300 50 RT = 147k 100 200 40 SWITCHING FREQUENCY (kHz) 100 TG1, TG2 MINIMUM ON-TIME (ns) 30 TG1, TG2 MINIMUM OFF-TIME (ns) 50 0 20 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 37911 G25 37911 G26 37911 G27 37911fb For more information www.linear.com/LT3791-1 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts