Datasheet LT3970 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes |
| Pages / Page | 22 / 5 — Typical perFormance characTerisTics TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 330 Kb |
| Document Language | English |
Typical perFormance characTerisTics TA = 25°C, unless otherwise noted. No-Load Supply Current. Maximum Load Current
Model Line for this Datasheet
LT3970 Series
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LT3970 Series
Typical perFormance characTerisTics TA = 25°C, unless otherwise noted. No-Load Supply Current No-Load Supply Current Maximum Load Current
4.0 15 550 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION VOUT = 3.3V VIN = 12V VOUT = 3.3V V 3.5 R1 = 1MΩ 12 OUT = 3.3V R2 = 576k R1 = 1M TYPICAL 500 LT3970-5 R2 = 576k LT3970-3.3 9 3.0 450 MINIMUM 2.5 6 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) LOAD CURRENT (mA) 400 2.0 3 1.5 0 350 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3970 G07 3970 G08 3870 G09
Maximum Load Current Maximum Load Current Load Regulation
600 600 0.20 FRONT PAGE APPLICATION V LIMITED BY CURRENT LIMIT H GRADE OUT = 5V 0.15 500 550 TYPICAL 0.10 400 500 0.05 LIMITED BY MAXIMUM 300 JUNCTION TEMPERATURE; 0 MINIMUM θJA = 76°C/W 450 –0.05 200 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD REGULATION (%) –0.10 400 100 FRONT PAGE APPLICATION VIN = 12V –0.15 FRONT PAGE APPLICATION VOUT = 5V REFERENCED FROM VOUT AT 100mA LOAD 350 0 –0.20 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 0 50 100 150 200 250 300 350 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (mA) 3870 G10 3970 G11 3970 G12
Switch Current Limit Switch Current Limit Switching Frequency
800 800 2.4 SWITCH PEAK CURRENT LIMIT 2.2 700 SWITCH PEAK 700 2.0 CURRENT LIMIT 1.8 600 600 1.6 1.4 500 500 1.2 CATCH DIODE VALLEY CURRENT LIMIT CATCH DIODE VALLEY CURRENT LIMIT 1.0 400 400 FREQUENCY (MHz) 0.8 0.6 SWITCH CURRENT LIMIT (mA) 300 SWITCH CURRENT LIMIT (mA) 300 0.4 0.2 200 200 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 3970 G13 3970 G14 3970 G15 3970fc 5 Document Outline Features Applications Description Typical Application 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 Related Parts
Typical perFormance characTerisTics TA = 25°C, unless otherwise noted. No-Load Supply Current No-Load Supply Current Maximum Load Current
4.0 15 550 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION VOUT = 3.3V VIN = 12V VOUT = 3.3V V 3.5 R1 = 1MΩ 12 OUT = 3.3V R2 = 576k R1 = 1M TYPICAL 500 LT3970-5 R2 = 576k LT3970-3.3 9 3.0 450 MINIMUM 2.5 6 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) LOAD CURRENT (mA) 400 2.0 3 1.5 0 350 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3970 G07 3970 G08 3870 G09
Maximum Load Current Maximum Load Current Load Regulation
600 600 0.20 FRONT PAGE APPLICATION V LIMITED BY CURRENT LIMIT H GRADE OUT = 5V 0.15 500 550 TYPICAL 0.10 400 500 0.05 LIMITED BY MAXIMUM 300 JUNCTION TEMPERATURE; 0 MINIMUM θJA = 76°C/W 450 –0.05 200 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD REGULATION (%) –0.10 400 100 FRONT PAGE APPLICATION VIN = 12V –0.15 FRONT PAGE APPLICATION VOUT = 5V REFERENCED FROM VOUT AT 100mA LOAD 350 0 –0.20 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 0 50 100 150 200 250 300 350 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (mA) 3870 G10 3970 G11 3970 G12
Switch Current Limit Switch Current Limit Switching Frequency
800 800 2.4 SWITCH PEAK CURRENT LIMIT 2.2 700 SWITCH PEAK 700 2.0 CURRENT LIMIT 1.8 600 600 1.6 1.4 500 500 1.2 CATCH DIODE VALLEY CURRENT LIMIT CATCH DIODE VALLEY CURRENT LIMIT 1.0 400 400 FREQUENCY (MHz) 0.8 0.6 SWITCH CURRENT LIMIT (mA) 300 SWITCH CURRENT LIMIT (mA) 300 0.4 0.2 200 200 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 3970 G13 3970 G14 3970 G15 3970fc 5 Document Outline Features Applications Description Typical Application 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 Related Parts
