Datasheet LTC3445 (Analog Devices) - 6

LTC3445
W U TYPICAL PERFOR A CE CHARACTERISTICS Buck (DAC = Min) Buck (DAC = Max) Slew Rates DAC Min to DAC Max 100mA to 300mA Load Step 100mA to 400mA Load Step
BUCK VOLTAGE BUCK 50mV/DIV VOLTAGE 50mV/DIV 200mV/DIV LOAD LOAD CURRENT CURRENT 100mA/DIV 100mA/DIV 100µs/DIV 3445 G13 20µs/DIV 3445 G14 20µs/DIV 3445 G15
Buck Switching Frequency Buck Switching Frequency Soft-Start (DAC = Min and Max) vs VCC1 vs Temperature 4.7
Ω
Load
1.60 1.560 1.540 BUCK 1.56 OUTPUTS 500mV/DIV 1.520 1.52 1.500 1.48 1.480 SWITCHING FREQUENCY (MHz) 1.44 SWITCHING FREQUENCY (MHz) 1.460 200µs/DIV 3445 G18 1.40 1.440 2.5 3.5 4.5 5.5 –50 –25 0 25 50 75 100 125 150 VCC1 (V) TEMPERATURE (°C) 3445 G16 3445 G17
PowerPath LDO Load Step VCC BATT vs VCC1 V 1mA to 5.5mA CC BATT vs VTRACK
6 6 VTRACK = VBACKUP = 2V VCC1 = 5.5V VCC BATT VBACKUP = 2V 0mA 5 5 5mA VCC BATT 20mV/DIV 4 4 VCC BATT 3 3 LOAD CURRENT VOLTAGE (V) VOLTAGE (V) 10mA/DIV 2 2 V V TRACK CC1 1 1 200µs/DIV 3445 G21 0 0 0 0 VCC1 RAMP (V) VTRACK RAMP (V) 3445 G19 3445 G20 3445fa 6