Datasheet LT3971A, LT3971A-5 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 38V, 1.3A, 2MHz Step-Down Regulator with 2.2μA Quiescent Current |
| Pages / Page | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 361 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Load Current. Load Regulation
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LT3971A/LT3971A-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Load Current Load Regulation Switching Frequency
2.5 0.30 1000 VOUT = 5V 0.25 950 0.20 2.0 TYPICAL 0.15 900 0.10 1.5 850 MINIMUM TION (%) 0.05 0 800 1.0 –0.05 750 –0.10 LOAD CURRENT (A) FREQUENCY (kHz) LOAD REGULA –0.15 700 0.5 –0.20 650 –0.25 REFERENCED FROM VOUT AT 0.5A LOAD 0 –0.30 600 5 10 15 20 25 30 35 40 0 200 400 600 800 1000 1200 –55 –25 5 35 65 95 125 155 INPUT VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C) 3971A G10 3971A G11 3971A G12
Switch Current Limit Switch Current Limit Switch VCESAT
3.0 2.5 600 2.4 2.5 500 2.3 2.2 2.0 400 2.1 (mV) 1.5 2.0 T 300 1.9 CESAV 1.0 200 1.8 SWITCH CURRENT LIMIT (A) SWITCH CURRENT LIMIT (A) 1.7 0.5 100 1.6 DUTY CYCLE = 30% 0 1.5 0 0 20 40 60 80 100 –55 –25 5 35 65 95 125 155 0 250 500 750 1000 1250 1500 DUTY CYCLE (%) TEMPERATURE (°C) SWITCH CURRENT (mA) 3971A G13 3971A G14 3971A G15
Boost Pin Current Frequency Foldback LT3971A-5 Frequency Foldback
30 900 900 800 800 25 700 700 20 600 600 500 500 15 400 400 10 300 300 BOOST PIN CURRENT (mA) 200 200 5 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 100 100 0 0 0 0 250 500 750 1000 1250 1500 0 0.2 0.4 0.6 0.8 1 1.2 0 20 40 60 80 100 SWITCH CURRENT (mA) FB PIN VOLTAGE (V) VOUT (% OF REGULATION VOLTAGE) 3971A G16 3971A G17 3971A G18 3971af 5 Document Outline FEATURES DESCRIPTION APPLICATIONS 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 TYPICAL APPLICATION RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Maximum Load Current Load Regulation Switching Frequency
2.5 0.30 1000 VOUT = 5V 0.25 950 0.20 2.0 TYPICAL 0.15 900 0.10 1.5 850 MINIMUM TION (%) 0.05 0 800 1.0 –0.05 750 –0.10 LOAD CURRENT (A) FREQUENCY (kHz) LOAD REGULA –0.15 700 0.5 –0.20 650 –0.25 REFERENCED FROM VOUT AT 0.5A LOAD 0 –0.30 600 5 10 15 20 25 30 35 40 0 200 400 600 800 1000 1200 –55 –25 5 35 65 95 125 155 INPUT VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C) 3971A G10 3971A G11 3971A G12
Switch Current Limit Switch Current Limit Switch VCESAT
3.0 2.5 600 2.4 2.5 500 2.3 2.2 2.0 400 2.1 (mV) 1.5 2.0 T 300 1.9 CESAV 1.0 200 1.8 SWITCH CURRENT LIMIT (A) SWITCH CURRENT LIMIT (A) 1.7 0.5 100 1.6 DUTY CYCLE = 30% 0 1.5 0 0 20 40 60 80 100 –55 –25 5 35 65 95 125 155 0 250 500 750 1000 1250 1500 DUTY CYCLE (%) TEMPERATURE (°C) SWITCH CURRENT (mA) 3971A G13 3971A G14 3971A G15
Boost Pin Current Frequency Foldback LT3971A-5 Frequency Foldback
30 900 900 800 800 25 700 700 20 600 600 500 500 15 400 400 10 300 300 BOOST PIN CURRENT (mA) 200 200 5 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 100 100 0 0 0 0 250 500 750 1000 1250 1500 0 0.2 0.4 0.6 0.8 1 1.2 0 20 40 60 80 100 SWITCH CURRENT (mA) FB PIN VOLTAGE (V) VOUT (% OF REGULATION VOLTAGE) 3971A G16 3971A G17 3971A G18 3971af 5 Document Outline FEATURES DESCRIPTION APPLICATIONS 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 TYPICAL APPLICATION RELATED PARTS
