Datasheet LT3434 (Analog Devices) - 5

LT3434
W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Threshold Oscillator Frequency Switch Peak Current Limit vs FB Voltage vs FB Voltage
6.0 50 250 TJ = 25°C TJ = 25°C 45 5.5 40 200 35 5.0 SOFT-START µA) 30 DEFEATED 150 4.5 25 20 100 4.0 CURRENT ( 15 FREQUENCY (kHz) PEAK SWITCH CURRENT (A) 10 50 3.5 5 3.0 0 0 –50 –25 –0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.2 0.4 0.6 0.8 1.0 1.2 TEMPERATURE (°C) FB VOLTAGE (V) FB VOLTAGE (V) 3434 G10 3434 G11 3434 G12
Switch On Voltage (VCESAT) Supply Current vs Input Voltage Minimum Input Voltage
500 150 7.5 VOUT = 3.3V 450 7.0 125 400 T 6.5 V J = 125°C OUT = 5V 350 µA) RUNNING 100 6.0 START-UP 300 TJ = 25°C 5.5 250 75 5.0 200 V VOLTAGE (mV) OUT = 3.3V TJ = –40°C 50 4.5 START-UP 150 INPUT VOLTAGE (V) SUPPLY CURRENT ( 100 4.0 25 RUNNING 50 3.5 0 0 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0 10 20 30 40 50 60 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3434 G13 3434 G20 3434 G19
Burst Mode Threshold vs Input Minimum On Time for Continuous Voltage Mode Operation Boost Current vs Load Current
900 700 60 VOUT = 3.3V 800 L = 33µH 650 COUT = 100µF 50 700 600 550 600 40 BURST MODE EXIT LOAD CURRENT = 0.5A 500 500 (INCREASING LOAD) 450 30 400 ON TIME (ns) 400 300 LOAD CURRENT = 1A 20 LOAD CURRENT (mA) 350 BOOST CURRENT (mA) 200 BURST MODE ENTER 300 (DECREASING LOAD) 10 100 250 LOAD CURRENT = 2A 0 200 0 5 10 15 20 –50 –25 –0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 2.5 3.0 INPUT VOLTAGE (V) TEMPERATURE (°C) SWITCH CURRENT (A) 3434 G21 3434 G22 3434 G23 3434fb 5