Datasheet LTC3708 (Analog Devices) - 7

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