Datasheet LT8616 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current |
| Pages / Page | 26 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Top FET Current Limit. Burst … |
| File Format / Size | PDF / 444 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Top FET Current Limit. Burst Frequency vs Load. Minimum Load for Full Frequency
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LT8616
TYPICAL PERFORMANCE CHARACTERISTICS Top FET Current Limit Burst Frequency vs Load Minimum Load for Full Frequency vs Duty Cycle
800 80 5.5 fSW = 700kHz 700 70 SYNC = 3V 5.0 600 60 4.5 500 50 4.0 400 40 VIN1 = VIN2 =12V 3.5 300 fSW = 700kHz 30 SYNC = 0V LOAD CURRENT (mA) CURRENT LIMIT (A) 3.0 200 20 SWITCHING FREQUENCY (kHz) 100 2.5 CH1, 5V 10 CH1, 5V CH1 CH2, 3.3V CH2, 3.3V CH2 0 0 2.0 0 50 100 150 200 250 300 350 400 0 5 10 15 20 25 30 35 40 0 20 40 60 80 100 LOAD CURRENT (mA) VIN (V) DUTY CYCLE (%) 8616 G19 8616 G20 8616 G21
Switch Resistance Current Limit vs Temperature vs Temperature Dropout Voltage vs Load
6 600 1000 CH1, TOP fSW = 2MHz CH1, BOTTOM 900 5 500 CH2, TOP CH2, BOTTOM 800 700 4 400 600 TAGE (mV) 3 ANCE (mΩ) 300 500 400 CURRENT LIMIT (A) 2 RESIST 200 300 CH1, 0% DC PEAK DROPOUT VOL 200 1 CH1, VALLEY 100 CH2, 0% DC PEAK 100 CH1, 5V CH2, VALLEY CH2, 5V 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 TEMPERATURE (°C) TEMPERATURE (°C) LOAD (A) 8616 G22 8616 G23 8616 G24
Start-Up Dropout (CH1, 5V) Start-Up Dropout (CH2, 3.3V) Start-Up Dropout (CH2, 3.3V)
VIN1 VIN1 AND VIN2 VIN2 1V/DIV 1V/DIV 1V/DIV VOUT1 VOUT2 VOUT2 1V/DIV 1V/DIV 1V/DIV 100ms/DIV 100ms/DIV 100ms/DIV RLOAD1 = 3.33Ω (1.5A) VIN1 = VIN2 VIN1 = 6V 8616 G26 8616 G27 RLOAD2 = 1.32Ω (2.5A) 8616 G28 RLOAD2 = 1.32Ω (2.5A) 8616fa For more information www.linear.com/LT8616 7
TYPICAL PERFORMANCE CHARACTERISTICS Top FET Current Limit Burst Frequency vs Load Minimum Load for Full Frequency vs Duty Cycle
800 80 5.5 fSW = 700kHz 700 70 SYNC = 3V 5.0 600 60 4.5 500 50 4.0 400 40 VIN1 = VIN2 =12V 3.5 300 fSW = 700kHz 30 SYNC = 0V LOAD CURRENT (mA) CURRENT LIMIT (A) 3.0 200 20 SWITCHING FREQUENCY (kHz) 100 2.5 CH1, 5V 10 CH1, 5V CH1 CH2, 3.3V CH2, 3.3V CH2 0 0 2.0 0 50 100 150 200 250 300 350 400 0 5 10 15 20 25 30 35 40 0 20 40 60 80 100 LOAD CURRENT (mA) VIN (V) DUTY CYCLE (%) 8616 G19 8616 G20 8616 G21
Switch Resistance Current Limit vs Temperature vs Temperature Dropout Voltage vs Load
6 600 1000 CH1, TOP fSW = 2MHz CH1, BOTTOM 900 5 500 CH2, TOP CH2, BOTTOM 800 700 4 400 600 TAGE (mV) 3 ANCE (mΩ) 300 500 400 CURRENT LIMIT (A) 2 RESIST 200 300 CH1, 0% DC PEAK DROPOUT VOL 200 1 CH1, VALLEY 100 CH2, 0% DC PEAK 100 CH1, 5V CH2, VALLEY CH2, 5V 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 TEMPERATURE (°C) TEMPERATURE (°C) LOAD (A) 8616 G22 8616 G23 8616 G24
Start-Up Dropout (CH1, 5V) Start-Up Dropout (CH2, 3.3V) Start-Up Dropout (CH2, 3.3V)
VIN1 VIN1 AND VIN2 VIN2 1V/DIV 1V/DIV 1V/DIV VOUT1 VOUT2 VOUT2 1V/DIV 1V/DIV 1V/DIV 100ms/DIV 100ms/DIV 100ms/DIV RLOAD1 = 3.33Ω (1.5A) VIN1 = VIN2 VIN1 = 6V 8616 G26 8616 G27 RLOAD2 = 1.32Ω (2.5A) 8616 G28 RLOAD2 = 1.32Ω (2.5A) 8616fa For more information www.linear.com/LT8616 7
