Datasheet LTC3835-1 (Analog Devices) - 4

LTC3835-1
ELECTRICAL CHARACTERISTICS Note 3:
TJ is calculated from the ambient temperature TA and power
Note 5:
Dynamic supply current is higher due to the gate charge being dissipation PD according to the following formulas: delivered at the switching frequency. See Applications Information. LTC3835GN-1: TJ = TA + (PD • 90°C/W)
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay LTC3835EDHC-1: TJ = TA + (PD • 43.5°C/W) times are measured using 50% levels.
Note 4:
The LTC3835-1 is tested in a feedback loop that servos VITH to a
Note 7:
The minimum on-time condition is specifi ed for an inductor specifi ed voltage and measures the resultant VFB. peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time Considerations in the Applications Information section).
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Effi ciency and Power Loss vs Output Current Effi ciency vs Load Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VIN = 12V VOUT = 3.3V 90 FORCED CONTINUOUS MODE VIN = 5V 96 FIGURE 10 CIRCUIT PULSE SKIPPING MODE 90 VOUT = 3.3V 80 1000 VIN = 12V POWER LOSS (mW) 94 70 VOUT = 3.3V 80 92 60 100 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 86 20 1 50 10 84 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 38351 G01 38351 G02 38351 G03
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse-Skipping Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 38351 G04 38351 G05 38351 G06 20μs/DIV 20μs/DIV 20ms/DIV FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V 38351fc 4