Datasheet LTC3828 (Analog Devices) - 6

LTC3828
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Maximum Current Sense Maximum Current Sense Maximum Current Sense Threshold vs Percent of Nominal Threshold vs Sense Common Threshold vs Duty Factor Output Voltage (Foldback) Mode Voltage
75 80 80 70 60 75 50 50 (mV) (mV) (mV) 40 70 SENSE SENSE SENSE V V 30 V 25 20 65 10 0 0 60 0 20 40 60 80 100 0 0.25 0.5 0.75 1.0 0 1 2 3 4 5 DUTY FACTOR (%) PERCENT ON NOMINAL OUTPUT VOLTAGE (%) COMM0N MODE VOLTAGE (V) 3828 G13 3828 G14 3828 G15
Current Sense Threshold vs Dropout Voltage vs Output Current ITH Voltage (Figure 14) SENSE Pins Total Source Current
80 4.0 100 70 3.5 60 3.0 50 50 2.5 40 (mV) (μA) 30 2.0 0 SENSEV 20 1.5 I SENSE 10 DROPOUT VOLTAGE (V) 1.0 –50 0 0.5 –10 –20 0 –100 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 1 2 3 4 5 6 V V ITH (V) OUTPUT CURRENT (A) SENSE COMMON MODE VOLTAGE (V) 3828 G16 3828 G17 3828 G18
Soft Start-Up Soft Start-Up Soft Start-Up (Figure 14, with Coincident (Figure 14, with Ratiometric (Figure 14, with Internal Soft Tracking) Tracking) Start-Up)
VOUT1 VOUT1 VOUT1 1V/DIV 1V/DIV 1V/DIV VOUT2 VOUT2 VOUT2 1V/DIV 1V/DIV 1V/DIV V 5ms/DIV IN = 12V V 2ms/DIV IN = 12V V 100μs/DIV IN = 12V VOUT1 = 5V VOUT1 = 5V VOUT1 = 5V V 3828 G19 OUT2 = 3.3V V 3828 G20 OUT2 = 3.3V V 3828 G21 OUT2 = 3.3V 3828fc 6