Datasheet LTC3708 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | Fast 2-Phase, No RSENSE Buck Controller with Output Tracking |
| Páginas / Página | 34 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Error Amplifier gm. SENSE Pin Input … |
| Formato / tamaño de archivo | PDF / 667 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Error Amplifier gm. SENSE Pin Input Current. RUN/SS Pin Current. vs Temperature
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LTC3708
TYPICAL PERFORMANCE CHARACTERISTICS Error Amplifier gm SENSE Pin Input Current RUN/SS Pin Current vs Temperature vs Temperature vs Temperature
1.6 150 3 140 1.5 130 2 120 1.4 PULL-DOWN CURRENT – 110 ISENSE 1 (µA) (mS) 1.3 100 + g m ISENSE I SENSE 90 0 1.2 80 PULL-UP CURRENT 70 RUN/SS PIN CURRENT (µA) –1 1.1 60 1.0 50 –2 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3708 G16 3708 G17 3708 G18
Feedback Voltage vs RUN/SS RUN/SS Latch-Off Thresholds Undervoltage Lockout Threshold (Soft-Start) vs Temperature vs Temperature
700 4.0 4.5 600 4.0 3.5 500 LATCHOFF ENABLE 400 3.5 (mV) 3.0 V FB 300 3.0 200 RUN/SS THRESHOLD (V) 2.5 LATCHOFF THRESHOLD 2.5 100 UNDERVOLTAGE LOCKOUT THRESHOLD (V) 0 2.0 2.0 1 1.25 1.5 1.75 2 2.25 2.5 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 RUN/SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3708 G19 3708 G20 3708 G21
On-Time vs EXTLPF Voltage On-Time vs INTLPF Voltage 2-Phase Operation
500 500 450 450 IIN 2A/DIV 400 400 I V ON1 = 30µA ION2 = 30µA IN 350 350 200mV/DIV 300 300 VSW1 (ns) 10V/DIV 250 (ns) 250 t ON1 200 t ON2 200 VSW2 ION1 = 60µA ION2 = 60µA 10V/DIV 150 150 100 100 V 3708 G024 IN = 15V 1µs/DIV 50 50 VOUT1 = 5V 0 0 VOUT2 = 3.3V 1 1.1 1.2 1.3 1.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 IOUT5 = IOUT3 = 2A EXTLPF VOLTAGE (V) INTLPF VOLTAGE (V) 3708 G22 3708 G23 3708fc For more information www.linear.com/LTC3708 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Error Amplifier gm SENSE Pin Input Current RUN/SS Pin Current vs Temperature vs Temperature vs Temperature
1.6 150 3 140 1.5 130 2 120 1.4 PULL-DOWN CURRENT – 110 ISENSE 1 (µA) (mS) 1.3 100 + g m ISENSE I SENSE 90 0 1.2 80 PULL-UP CURRENT 70 RUN/SS PIN CURRENT (µA) –1 1.1 60 1.0 50 –2 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3708 G16 3708 G17 3708 G18
Feedback Voltage vs RUN/SS RUN/SS Latch-Off Thresholds Undervoltage Lockout Threshold (Soft-Start) vs Temperature vs Temperature
700 4.0 4.5 600 4.0 3.5 500 LATCHOFF ENABLE 400 3.5 (mV) 3.0 V FB 300 3.0 200 RUN/SS THRESHOLD (V) 2.5 LATCHOFF THRESHOLD 2.5 100 UNDERVOLTAGE LOCKOUT THRESHOLD (V) 0 2.0 2.0 1 1.25 1.5 1.75 2 2.25 2.5 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 RUN/SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3708 G19 3708 G20 3708 G21
On-Time vs EXTLPF Voltage On-Time vs INTLPF Voltage 2-Phase Operation
500 500 450 450 IIN 2A/DIV 400 400 I V ON1 = 30µA ION2 = 30µA IN 350 350 200mV/DIV 300 300 VSW1 (ns) 10V/DIV 250 (ns) 250 t ON1 200 t ON2 200 VSW2 ION1 = 60µA ION2 = 60µA 10V/DIV 150 150 100 100 V 3708 G024 IN = 15V 1µs/DIV 50 50 VOUT1 = 5V 0 0 VOUT2 = 3.3V 1 1.1 1.2 1.3 1.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 IOUT5 = IOUT3 = 2A EXTLPF VOLTAGE (V) INTLPF VOLTAGE (V) 3708 G22 3708 G23 3708fc For more information www.linear.com/LTC3708 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts