Datasheet LTC3728L, LTC3728LX (Analog Devices) - 7

LTC3728L/LTC3728LX
Typical perForMance characTerisTics Maximum Current Sense Threshold Maximum Current Sense Threshold Current Sense Threshold vs VRUN/SS (Soft-Start) vs Sense Common Mode Voltage vs ITH Voltage
80 80 90 VSENSE(CM) = 1.6V 80 70 76 60 60 50 72 40 (mV) (mV) (mV) 40 30 20 V SENSE V SENSE 68 V SENSE 10 20 0 64 –10 –20 0 60 –30 0 1 2 3 4 5 6 0 1 2 3 4 5 0 0.5 1 1.5 2 2.5 VRUN/SS (V) COMMON MODE VOLTAGE (V) VITH (V) 3728L G10 3728L G11 3728L G12
Load Regulation VITH vs VRUN/SS SENSE Pins Total Source Current
0.0 2.5 100 FCB = 0V VOSENSE = 0.7V VIN = 15V FIGURE 13 2.0 –0.1 50 (%) OUT 1.5 –0.2 (V) (µA) 0 V ITH 1.0 I SENSE NORMALIZED V –0.3 –50 0.5 –0.4 0 –100 0 1 2 3 4 5 0 1 2 3 4 5 6 0 2 4 6 LOAD CURRENT (A) VRUN/SS (V) VSENSE COMMON MODE VOLTAGE (V) 3728L G13 3728L G14 3728L G15
Maximum Current Sense Dropout Voltage vs Output Current Threshold vs Temperature (Figure 14) RUN/SS Current vs Temperature
80 4 1.8 VOUT = 5V 1.6 78 3 1.4 1.2 76 (mV) 1.0 2 0.8 V SENSE 74 RSENSE = 0.015Ω 0.6 DROPOUT VOLTAGE (V) 1 RUN/SS CURRENT (µA) 72 0.4 RSENSE = 0.010Ω 0.2 70 0 0 –50 –25 0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) OUTPUT CURRENT (A) TEMPERATURE (°C) 3728L G17 3728L G18 3728L G25 3728lxff 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts