Datasheet LT3640 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| Pages / Page | 24 / 6 — TA = 25°C, unless otherwise noted. Switching Frequency. HV Channel … |
| File Format / Size | PDF / 523 Kb |
| Document Language | English |
TA = 25°C, unless otherwise noted. Switching Frequency. HV Channel Current Limit. FB2 Voltage vs SS2. vs Temperature
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LT3640 Typical perForMance characTerisTics
TA = 25°C, unless otherwise noted. Switching Frequency HV Channel Current Limit FB2 Voltage vs SS2 vs Temperature vs Duty Cycle
700 0.52 2.5 RT = 182k 600 2.0 0.51 500 1.5 400 TAGE (mV) 0.50 300 1.0 FB2 VOL 200 0.49 SWITCHING FREQUENCY (MHz) SW1 PEAK CURRENT LIMIT (A) 0.5 100 0 0.48 0.0 0 200 400 6000 800 1000 –50 0 50 100 150 0 20 40 60 80 100 SS2 VOLTAGE (mV) TEMPERATURE (°C) DUTY CYCLE (%) 3640 G10 3640 G11 3640 G12
LV Channel Peak Current Limit LV Channel Switch Voltage VOUT1 Minimum Load to Run at vs Duty Cycle Drop vs Current (VIN2 = 3.3V) Full Frequency (VOUT1 = 3.3V)
2.0 450 0.45 400 0.40 0.35 1.5 350 300 0.30 PMOS 2.5MHz 250 0.25 2MHz 1.0 TAGE DROP (mV) 200 CURRENT (A) 0.20 NMOS 150 V OUT1 0.15 0.5 SW2 VOL 100 0.10 SW2 PEAK CURRENT LIMIT (A) 50 0.05 0.0 0 0 0 20 40 60 80 100 0 0.5 1 1.5 0 5 10 15 20 25 30 DUTY CYCLE (%) SW2 CURRENT (A) VIN VOLTAGE (V) 3640 G13 3640 G14 3640 G15
HV Channel Switching Frequency LV Channel Switching Frequency (VOUT1 = 3.3V) (VOUT2 = 1.8V)
2.5 2.5 RT = 32.4k VIN = 12V VIN2 = 3.3V 2.0 2.0 1.5 1.5 VIN = 16V VIN2 = 5V 1.0 1.0 VIN = 24V SWITCHING FREQUENCY (MHz) 0.5 SWITCHING FREQUENCY (MHz) 0.5 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.2 0.4 0.6 0.8 1.0 VOUT1 CURRENT (A) VOUT2 CURRENT (A) 3640 G16 3640 G17 3640f Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TA = 25°C, unless otherwise noted. Switching Frequency HV Channel Current Limit FB2 Voltage vs SS2 vs Temperature vs Duty Cycle
700 0.52 2.5 RT = 182k 600 2.0 0.51 500 1.5 400 TAGE (mV) 0.50 300 1.0 FB2 VOL 200 0.49 SWITCHING FREQUENCY (MHz) SW1 PEAK CURRENT LIMIT (A) 0.5 100 0 0.48 0.0 0 200 400 6000 800 1000 –50 0 50 100 150 0 20 40 60 80 100 SS2 VOLTAGE (mV) TEMPERATURE (°C) DUTY CYCLE (%) 3640 G10 3640 G11 3640 G12
LV Channel Peak Current Limit LV Channel Switch Voltage VOUT1 Minimum Load to Run at vs Duty Cycle Drop vs Current (VIN2 = 3.3V) Full Frequency (VOUT1 = 3.3V)
2.0 450 0.45 400 0.40 0.35 1.5 350 300 0.30 PMOS 2.5MHz 250 0.25 2MHz 1.0 TAGE DROP (mV) 200 CURRENT (A) 0.20 NMOS 150 V OUT1 0.15 0.5 SW2 VOL 100 0.10 SW2 PEAK CURRENT LIMIT (A) 50 0.05 0.0 0 0 0 20 40 60 80 100 0 0.5 1 1.5 0 5 10 15 20 25 30 DUTY CYCLE (%) SW2 CURRENT (A) VIN VOLTAGE (V) 3640 G13 3640 G14 3640 G15
HV Channel Switching Frequency LV Channel Switching Frequency (VOUT1 = 3.3V) (VOUT2 = 1.8V)
2.5 2.5 RT = 32.4k VIN = 12V VIN2 = 3.3V 2.0 2.0 1.5 1.5 VIN = 16V VIN2 = 5V 1.0 1.0 VIN = 24V SWITCHING FREQUENCY (MHz) 0.5 SWITCHING FREQUENCY (MHz) 0.5 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.2 0.4 0.6 0.8 1.0 VOUT1 CURRENT (A) VOUT2 CURRENT (A) 3640 G16 3640 G17 3640f Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
