Datasheet LTC3878 (Analog Devices) - 6

LTC3878 Typical perForMance characTerisTics
Shutdown Current Error Amplifier gm vs Temperature vs Input Voltage Quiescent Current vs INTVCC
2.0 35 4.0 1.9 3.5 1.8 30 3.0 1.7 1.6 25 2.5 (mS) 1.5 2.0 g m 1.4 20 1.5 1.3 INPUT CURRENT (µA) 1.0 1.2 15 QUIESCENT CURRENT (mA) 1.1 0.5 1.0 10 0 –50 0 50 100 5 10 15 20 25 30 35 40 4.0 4.5 5.0 5.5 6.0 6.5 7.0 TEMPERATURE (°C) INPUT VOLTAGE (V) INTVCC (V) 3878 G19 3878 G20 3878 G21
INTVCC Load Regulation INTVCC Dropout INTVCC vs INTVCC ILOAD
0 0 6 VIN = 12V VIN = 4.5V VIN = 12V –0.2 –200 5 –0.4 –0.6 INTVCC INTVCC –400 4 ILOAD ILOAD FALLING RISING (%) –0.8 (V) CC –1.0 –600 V CC 3 $INTV –1.2 INT DO NOT EXCEED ≥50mA 2 CONTINUOUS –1.4 DROPOUT VOLTAGE (mV) –800 CC ILIMIT = 150mA, –1.6 INTVCC > 0.7V INTV –1000 1 ILIMIT = 22mA, –1.8 INTVCC < 0.7V –2.0 –1200 0 0 10 20 30 40 50 0 10 20 30 40 50 0 50 100 150 200 INTVCC LOAD CURRENT (mA) INTVCC LOAD CURRENT (mA) ILOAD (mA) 3878 G22 3878 G23 3878 G24
RUN/SS Pin Current vs Efficiency: LTC3878 vs LTC1778 Temperature
94 1.6 VIN = 15V V 92 OUT = 1.2V LTC3878 FCB = INTVCC 1.4 90 LTC1778 88 1.6% 1.2 86 EFFICIENCY (%) QT = RJK0305DPB 84 QB = RJK0330DPB L = PULSE PA0513.441NLT RUN/SS PIN CURRENT (µA) 1.0 f 82 SW = 300kHz VIN = 12V VOUT = 1.2V 80 0.8 0 5 10 15 20 25 –50 0 50 100 LOAD CURRENT (A) TEMPERATURE (°C) 3878 G25 3878 G26 3878fa Document Outline Features Description Applications 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