Datasheet LT3668 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs |
| Pages / Page | 28 / 7 — 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. Switching Waveforms,. Switching Waveforms, Full
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LT3668
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Waveforms, Switching Waveforms, Full Burst Mode Operation Frequency Continuous Operation EN Threshold
1.0 0.9 VSW VSW 0.8 5V/DIV 5V/DIV 0.7 0.6 0.5 IL IL 100mA/DIV 200mA/DIV 0.4 0.3 V THRESHOLD VOLTAGE (V) OUT1 VOUT1 0.2 5mV/DIV 5mV/DIV ILOAD = 10mA 0.1 FRONT PAGE APPLICATION, V I OUT1 = 5V LOAD = 400mA, FRONT PAGE APPLICATION 0 3668 G19 1µs/DIV 3668 G20 1µs/DIV –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3668 G21
LDOs: LDOs: EN Pin Current Tracking Tracking Error
1.0 10 10 VIN2/3 = 11V VIN2/3 = 6V 9 9 VADJ2/3 = 5V 0.8 8 8 7 7 0.6 (mV) 6 6 5 ADJ2/3 5 -V 0.4 4 4 EN PIN CURRENT (µA) OUT2/3 VOLTAGE (V) 3 V OUT2/3 3 0.2 2 2 1 1 0 0 0 0 5 10 15 20 25 30 35 40 0 1 2 3 4 5 6 7 8 9 10 50 –25 0 25 50 75 100 125 150 EN PIN VOLTAGE (V) ADJ2/3 VOLTAGE (V) TEMPERATURE (°C) 3668 G22 3668 G23 3668 G24
LDOs: LDOs: LDOs: Tracking Error Typical Dropout Voltage Guaranteed Dropout Voltage
4 600 800 T 550 A = –50°C = TEST POINTS TA = 25°C 700 500 TA = 125°C 3 450 TA = 150°C 600 400 TJ = 125°C (mV) 500 2 350 ADJ2/3 300 400 -V 1 250 TJ = 25°C 300 200 V OUT2/3 DROPOUT VOLTAGE (mV) 150 DROPOUT VOLTAGE (mV) 200 0 100 100 50 –1 0 0 1 2 3 4 5 6 7 8 9 10 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 VADJ2/3 (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3668 G25 3668 G26 3668 G27 3668fa For more information www.linear.com/LT3668 7 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. Switching Waveforms, Switching Waveforms, Full Burst Mode Operation Frequency Continuous Operation EN Threshold
1.0 0.9 VSW VSW 0.8 5V/DIV 5V/DIV 0.7 0.6 0.5 IL IL 100mA/DIV 200mA/DIV 0.4 0.3 V THRESHOLD VOLTAGE (V) OUT1 VOUT1 0.2 5mV/DIV 5mV/DIV ILOAD = 10mA 0.1 FRONT PAGE APPLICATION, V I OUT1 = 5V LOAD = 400mA, FRONT PAGE APPLICATION 0 3668 G19 1µs/DIV 3668 G20 1µs/DIV –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3668 G21
LDOs: LDOs: EN Pin Current Tracking Tracking Error
1.0 10 10 VIN2/3 = 11V VIN2/3 = 6V 9 9 VADJ2/3 = 5V 0.8 8 8 7 7 0.6 (mV) 6 6 5 ADJ2/3 5 -V 0.4 4 4 EN PIN CURRENT (µA) OUT2/3 VOLTAGE (V) 3 V OUT2/3 3 0.2 2 2 1 1 0 0 0 0 5 10 15 20 25 30 35 40 0 1 2 3 4 5 6 7 8 9 10 50 –25 0 25 50 75 100 125 150 EN PIN VOLTAGE (V) ADJ2/3 VOLTAGE (V) TEMPERATURE (°C) 3668 G22 3668 G23 3668 G24
LDOs: LDOs: LDOs: Tracking Error Typical Dropout Voltage Guaranteed Dropout Voltage
4 600 800 T 550 A = –50°C = TEST POINTS TA = 25°C 700 500 TA = 125°C 3 450 TA = 150°C 600 400 TJ = 125°C (mV) 500 2 350 ADJ2/3 300 400 -V 1 250 TJ = 25°C 300 200 V OUT2/3 DROPOUT VOLTAGE (mV) 150 DROPOUT VOLTAGE (mV) 200 0 100 100 50 –1 0 0 1 2 3 4 5 6 7 8 9 10 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 VADJ2/3 (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3668 G25 3668 G26 3668 G27 3668fa For more information www.linear.com/LT3668 7 Document Outline Features Applications Description Typical Application Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
