Datasheet LT3437 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| Pages / Page | 28 / 6 — TYPICAL PERFOR A CE CHARACTERISTICS. Soft-Start Current Threshold. … |
| File Format / Size | PDF / 573 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Soft-Start Current Threshold. Oscillator Frequency. vs FB Voltage
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LT3437
W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Current Threshold Oscillator Frequency vs FB Voltage vs FB Voltage Switch On Voltage (VCESAT)
35 250 600 SOFT-START DEFEATED TJ = 125°C 30 500 200 25 400 150 µA) 20 ( 300 TJ = 25°C I CSS 15 100 VOLTAGE (mV) 200 TJ = –40°C FREQUENCY (kHz) 10 50 100 5 0 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.25 0.50 0.75 1.00 1.25 100 200 300 400 500 FB VOLTAGE (V) FB VOLTAGE (V) LOAD CURRENT (mA) 3437 G10 3437 G11 3437 G12
Burst Mode Threshold Supply Current vs Input Voltage Minimum Input Voltage vs Input Voltage
200 7.5 200 VOUT = 3.3V VOUT = 3.3V 180 5V TO START 7.0 180 160 160 6.5 µA) 140 140 6.0 5V TO RUN ENTER 120 120 5.5 EXIT 100 100 5.0 80 3.3V TO START 80 60 4.5 60 SUPPLY CURRENT ( INPUT VOLTAGE (V) LOAD CURRENT (mA) 40 4.0 40 20 3.5 3.3V TO RUN 20 0 3.0 0 0 10 20 30 40 50 60 70 80 0 100 200 300 400 500 0 10 20 30 40 50 60 INPUT VOLTAGE (V) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3437 F13 3437 G14 3437 G15
Minimum On-Time Boost Current vs Load Current Dropout Operation
500 12 4.0 VOUT = 3.3V 450 I 3.5 LOAD = 250mA 11 BOOST DIODE = 400 DIODES INC B1100 3.0 350 10 300 2.5 250 9 2.0 ON-TIME (ns) 200 1.5 8 150 BOOST CURRENT (mA) OUTPUT VOLTAGE (V) 1.0 100 7 50 0.5 0 6 0 –50 –25 0 25 50 75 100 125 150 100 200 300 400 500 2.0 2.5 3.0 3.5 4.0 4.5 TEMPERATURE (°C) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3437 G16 3437 G17 3437 G18 3437fc 6
W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Current Threshold Oscillator Frequency vs FB Voltage vs FB Voltage Switch On Voltage (VCESAT)
35 250 600 SOFT-START DEFEATED TJ = 125°C 30 500 200 25 400 150 µA) 20 ( 300 TJ = 25°C I CSS 15 100 VOLTAGE (mV) 200 TJ = –40°C FREQUENCY (kHz) 10 50 100 5 0 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.25 0.50 0.75 1.00 1.25 100 200 300 400 500 FB VOLTAGE (V) FB VOLTAGE (V) LOAD CURRENT (mA) 3437 G10 3437 G11 3437 G12
Burst Mode Threshold Supply Current vs Input Voltage Minimum Input Voltage vs Input Voltage
200 7.5 200 VOUT = 3.3V VOUT = 3.3V 180 5V TO START 7.0 180 160 160 6.5 µA) 140 140 6.0 5V TO RUN ENTER 120 120 5.5 EXIT 100 100 5.0 80 3.3V TO START 80 60 4.5 60 SUPPLY CURRENT ( INPUT VOLTAGE (V) LOAD CURRENT (mA) 40 4.0 40 20 3.5 3.3V TO RUN 20 0 3.0 0 0 10 20 30 40 50 60 70 80 0 100 200 300 400 500 0 10 20 30 40 50 60 INPUT VOLTAGE (V) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3437 F13 3437 G14 3437 G15
Minimum On-Time Boost Current vs Load Current Dropout Operation
500 12 4.0 VOUT = 3.3V 450 I 3.5 LOAD = 250mA 11 BOOST DIODE = 400 DIODES INC B1100 3.0 350 10 300 2.5 250 9 2.0 ON-TIME (ns) 200 1.5 8 150 BOOST CURRENT (mA) OUTPUT VOLTAGE (V) 1.0 100 7 50 0.5 0 6 0 –50 –25 0 25 50 75 100 125 150 100 200 300 400 500 2.0 2.5 3.0 3.5 4.0 4.5 TEMPERATURE (°C) LOAD CURRENT (mA) INPUT VOLTAGE (V) 3437 G16 3437 G17 3437 G18 3437fc 6
