Datasheet LT3668 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 386 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency, VOUT1 = 3.3V. Efficiency, VOUT1 = 6V
Model Line for this Datasheet
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LT3668
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency, VOUT1 = 3.3V Efficiency, VOUT1 = 6V VFB1 vs Temperature
90 100 1.30 80 90 VIN1 = 12V VIN1 = 12V 70 80 VIN1 = 24V 1.25 VIN1 = 24V 70 60 V 60 50 IN1 = 36V VIN1 = 36V (V) 50 1.20 40 V FB1 40 EFFICIENCY (%) 30 EFFICIENCY (%) 30 1.15 20 FRONT PAGE APPLICATION FRONT PAGE APPLICATION BUCK REGULATOR ONLY 20 BUCK REGULATOR ONLY 10 VOUT1 = 3.3V 10 VOUT1 = 6V L: MSS7341-223MLB L: MSS7341-273MLB 0 0 1.10 0.01 0.1 1 10 100 0.01 0.1 1 10 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 3668 G02 3668 G03 3668 G01
No-Load Supply Current No-Load Supply Current Maximum Load Current
100 700 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 90 CATCH DIODE: CMMSH1-60 VOUT1 = 3.3V 80 650 1m 70 INCREASED SUPPLY CURRENT 600 TYPICAL 60 DUE TO CATCH DIODE LEAKAGE 50 AT HIGH TEMPERATURE 550 40 100µ 30 500 SUPPLY CURRENT (µA) SUPPLY CURRENT (A) LOAD CURRENT (mA) MINIMUM 20 450 10 0 10µ 400 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) 3668 G04 3668 G05 3668 G06
Switching Regulator Maximum Load Current Load Regulation Switch Current Limit
700 0.10 800 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 0.08 REFERENCED FROM VOUT1 AT 200mA LOAD SWITCH PEAK 650 0.06 CURRENT LIMIT 700 0.04 600 0.02 TYPICAL 550 0 600 –0.02 500 LOAD CURRENT (mA) –0.04 CATCH DIODE VALLEY CURRENT LIMIT LOAD REGULATION (%) 500 MINIMUM –0.06 450 SWITCH CURRENT LIMIT (mA) –0.08 400 –0.10 400 5 10 15 20 25 30 35 40 0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 INPUT VOLTAGE (V) LOAD CURRENT (mA) DUTY CYCLE (%) 3668 G07 3668 G08 3668 G09 3668fa For more information www.linear.com/LT3668 5 Document Outline Features Applications Description Typical Application Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency, VOUT1 = 3.3V Efficiency, VOUT1 = 6V VFB1 vs Temperature
90 100 1.30 80 90 VIN1 = 12V VIN1 = 12V 70 80 VIN1 = 24V 1.25 VIN1 = 24V 70 60 V 60 50 IN1 = 36V VIN1 = 36V (V) 50 1.20 40 V FB1 40 EFFICIENCY (%) 30 EFFICIENCY (%) 30 1.15 20 FRONT PAGE APPLICATION FRONT PAGE APPLICATION BUCK REGULATOR ONLY 20 BUCK REGULATOR ONLY 10 VOUT1 = 3.3V 10 VOUT1 = 6V L: MSS7341-223MLB L: MSS7341-273MLB 0 0 1.10 0.01 0.1 1 10 100 0.01 0.1 1 10 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 3668 G02 3668 G03 3668 G01
No-Load Supply Current No-Load Supply Current Maximum Load Current
100 700 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 90 CATCH DIODE: CMMSH1-60 VOUT1 = 3.3V 80 650 1m 70 INCREASED SUPPLY CURRENT 600 TYPICAL 60 DUE TO CATCH DIODE LEAKAGE 50 AT HIGH TEMPERATURE 550 40 100µ 30 500 SUPPLY CURRENT (µA) SUPPLY CURRENT (A) LOAD CURRENT (mA) MINIMUM 20 450 10 0 10µ 400 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) 3668 G04 3668 G05 3668 G06
Switching Regulator Maximum Load Current Load Regulation Switch Current Limit
700 0.10 800 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 0.08 REFERENCED FROM VOUT1 AT 200mA LOAD SWITCH PEAK 650 0.06 CURRENT LIMIT 700 0.04 600 0.02 TYPICAL 550 0 600 –0.02 500 LOAD CURRENT (mA) –0.04 CATCH DIODE VALLEY CURRENT LIMIT LOAD REGULATION (%) 500 MINIMUM –0.06 450 SWITCH CURRENT LIMIT (mA) –0.08 400 –0.10 400 5 10 15 20 25 30 35 40 0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 INPUT VOLTAGE (V) LOAD CURRENT (mA) DUTY CYCLE (%) 3668 G07 3668 G08 3668 G09 3668fa For more information www.linear.com/LT3668 5 Document Outline Features Applications Description Typical Application Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
