Datasheet LT3435 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Voltage 3A, 500kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| Pages / Page | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Soft-Start Current Threshold. … |
| File Format / Size | PDF / 327 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Soft-Start Current Threshold. Oscillator Frequency. Switch Peak Current Limit
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LT3435
W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Current Threshold Oscillator Frequency Switch Peak Current Limit vs FB Voltage vs FB Voltage
6.0 50 100 TJ = 25°C 45 90 5.5 40 80 35 70 5.0 SOFT-START µA) 30 DEFEATED 60 4.5 25 50 20 40 CURRENT ( 4.0 15 30 PEAK SWITCH CURRENT (A) 10 3.5 NORMALIZED FREQUENCY (%) 20 5 10 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 0.25 0.50 0.75 1.00 1.25 TEMPERATURE (°C) FB VOLTAGE (V) FB VOLTAGE (V) 3435 G10 3435 G11 3435 G12
Burst Mode Threshold vs Input Switch On Voltage (VCESAT) Minimum Input Voltage Voltage
500 1000 8.0 VOUT = 3.3V BURST MODE EXIT 450 900 L = 15 7.5 µH (INCREASING LOAD) C 400 800 OUT = 100µF 7.0 TA = 25°C TJ = 125°C 350 700 6.5 START-UP 300 TJ = 25°C 600 6.0 VOUT = 5V 250 500 5.5 RUNNING BURST MODE ENTER 200 400 5.0 (DECREASING LOAD) VOLTAGE (mV) TJ = –40°C 150 INPUT VOLTAGE (V) 4.5 START-UP LOAD CURRENT (mA) 300 100 VOUT = 3.3V 200 4.0 50 RUNNING 100 3.5 0 0 3.0 0.5 1.0 1.5 2.0 2.5 3.0 5 0 0.5 1.0 1.5 3.0 10 15 20 2.0 2.5 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3435 G13 3435 G16 3435 G15
Minimum On-Time for Continuous Maximum Synchronization Mode Operation Frequency vs Temperature Boost Current vs Switch Current
600 1000 70 LOAD CURRENT = 1A 550 950 60 500 900 450 850 50 400 800 40 350 750 30 300 700 ON TIME (ns) FREQUENCY (kHz) 250 650 BOOST CURRENT (mA) 20 200 600 10 150 550 100 500 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 500 1000 1500 2000 2500 3000 TEMPERATURE (°C) TEMPERATURE (°C) SWITCH CURRENT (mA) 3435 G17 3435 G14 3435 G18 3435fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Current Threshold Oscillator Frequency Switch Peak Current Limit vs FB Voltage vs FB Voltage
6.0 50 100 TJ = 25°C 45 90 5.5 40 80 35 70 5.0 SOFT-START µA) 30 DEFEATED 60 4.5 25 50 20 40 CURRENT ( 4.0 15 30 PEAK SWITCH CURRENT (A) 10 3.5 NORMALIZED FREQUENCY (%) 20 5 10 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 0.25 0.50 0.75 1.00 1.25 TEMPERATURE (°C) FB VOLTAGE (V) FB VOLTAGE (V) 3435 G10 3435 G11 3435 G12
Burst Mode Threshold vs Input Switch On Voltage (VCESAT) Minimum Input Voltage Voltage
500 1000 8.0 VOUT = 3.3V BURST MODE EXIT 450 900 L = 15 7.5 µH (INCREASING LOAD) C 400 800 OUT = 100µF 7.0 TA = 25°C TJ = 125°C 350 700 6.5 START-UP 300 TJ = 25°C 600 6.0 VOUT = 5V 250 500 5.5 RUNNING BURST MODE ENTER 200 400 5.0 (DECREASING LOAD) VOLTAGE (mV) TJ = –40°C 150 INPUT VOLTAGE (V) 4.5 START-UP LOAD CURRENT (mA) 300 100 VOUT = 3.3V 200 4.0 50 RUNNING 100 3.5 0 0 3.0 0.5 1.0 1.5 2.0 2.5 3.0 5 0 0.5 1.0 1.5 3.0 10 15 20 2.0 2.5 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3435 G13 3435 G16 3435 G15
Minimum On-Time for Continuous Maximum Synchronization Mode Operation Frequency vs Temperature Boost Current vs Switch Current
600 1000 70 LOAD CURRENT = 1A 550 950 60 500 900 450 850 50 400 800 40 350 750 30 300 700 ON TIME (ns) FREQUENCY (kHz) 250 650 BOOST CURRENT (mA) 20 200 600 10 150 550 100 500 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 500 1000 1500 2000 2500 3000 TEMPERATURE (°C) TEMPERATURE (°C) SWITCH CURRENT (mA) 3435 G17 3435 G14 3435 G18 3435fa 5
