Datasheet LT3797 (Analog Devices) - 7

LT3797
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Switching Frequency VIN, INTVCC Quiescent Current RT vs Switching Frequency vs Temperature vs VIN
420 2.5 PWM = 0V 415 I 2.0 INTVCC 410 100 405 1.5 (kΩ) 400 R T 395 1.0 QUIESCENT CURRENT (mA) I 390 CC VIN SWITCHING FREQUENCY (kHz) 0.5 385 , INTV V IN 10 380 0 0 100 200 300 400 500 600 700 800 900 1000 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 35 40 SWITCHING FREQUENCY (kHz) TEMPERATURE (°C) VIN (V) 3797 G10 3797 G11 3797 G12
EN/UVLO Falling/Rising EN/UVLO Hysteresis Current OVLO Threshold vs Temperature Threshold vs Temperature vs Temperature
1.27 1.25 2.4 1.25 OVLO RISING THRESHOLD 1.24 1.23 2.2 1.21 1.23 EN/UVLO RISING THRESHOLD 1.19 1.22 2.0 OVLO (V) 1.17 EN/UVLO (V) EN/UVLO FALLING THRESHOLD 1.15 1.21 OVLO FALLING THRESHOLD 1.8 1.13 1.20 1.11 EN/UVLO HYSTERESIS CURRENT (µA) 1.09 1.19 1.6 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3797 G13 3797 G14 3797 G15
SENSE Current Limit Threshold SENSE Current Limit Threshold EN/UVLO Current vs Voltage vs Temperature vs Duty Cycle
2.5 115 115 114 2.0 113 110 1.5 112 (mV) (mV) 111 1.0 110 105 109 0.5 108 EN/UVLO CURRENT (µA) V (SENSEP-SENSEN) V (SENSEP-SENSEN) 100 0 107 106 –0.5 105 95 0.122 1.22 12.2 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 EN/UVLO VOLTAGE (V) TEMPERATURE (°C) DUTY CYCLE 3797 G16 3797 G17 3797 G18 Rev C For more information www.analog.com 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 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