Datasheet LTC3736-2 (Analog Devices) - 4

LTC3736-2
ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Dynamic supply current is higher due to gate charge being may cause permanent damage to the device. Exposure to any Absolute delivered at the switching frequency. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3736-2 is tested in a feedback loop that servos ITH to a reliability and lifetime. specifi ed voltage and measures the resultant VFB voltage.
Note 2:
The LTC3736E-2 is guaranteed to meet specifi ed performance
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range a percentage of value as shown in Figure 1. are assured by design, characterization and correlation with statistical process controls.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Effi ciency and Power Loss Load Step vs Load Current (Forced Continuous Mode) Load Step (Pulse-Skipping Mode)
100 10 VOUT = 2.5V 95 VOUT VOUT AC AC 90 COUPLED COUPLED EFFICIENCY 1 100mV/ 100mV/ 85 POWER LOSS (W) DIV DIV 80 75 0.1 POWER LOSS IL IL 70 2A/DIV 2A/DIV EFFICIENCY (%) 65 0.01 60 VIN = 3.3V 100μs/DIV 37362 G02 VIN = 3.3V 100μs/DIV 37362 G03 55 VIN = 3.3V VOUT = 1.8V VOUT = 1.8V VIN = 5V I I 50 0.001 LOAD = 300mA TO 3A LOAD = 300mA TO 3A SYNC/FCB = 0V SYNC/FCB = V 1 10 100 1000 10000 IN FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT LOAD CURRENT (mA) 37362 G01
Light Load Light Load Tracking Start-Up with Internal (Pulse-Skipping Mode) (Forced Continuous Mode) Soft-Start (CSS = 0μF)
VOUT1 2.5V SW SW 5V/DIV 5V/DIV VOUT 500mV/ 50mV/DIV V V OUT OUT2 DIV AC 50mV/DIV 1.8V COUPLED AC COUPLED I I L L 2A/DIV 2A/DIV V 2.5μs/DIV 37362 G04 IN = 5V V 2.5μs/DIV 37362 G05 IN = 5V VIN = 5V 200μs/DIV 37362 G06 VOUT = 2.5V VOUT = 2.5V RLOAD1 = RLOAD2 = 1Ω ILOAD = 300mA ILOAD = 300mA FIGURE 15 CIRCUIT SYNC/FBC = VIN SYNC/FCB = 0V FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT 37362fb 4