Datasheet LTC1775 (Analog Devices) - 4

LTC1775
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Input Voltage Efficiency vs Input Voltage
100 100 100 I 95 LOAD = 5A 95 90 ILOAD = 5A 90 90 80 ILOAD = 500mA I CONTINUOUS LOAD = 500mA BURST MODE 85 85 MODE 70 EFFICIENCY (%) EFFICIENCY (%) 80 EFFICIENCY (%) 80 60 VIN = 10V 75 75 VOUT = 5V VOUT = 5V V EXTV OUT = 3.3V CC = VOUT FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT 50 70 70 0.001 0.01 0.1 1.0 10 0 5 10 15 20 25 30 0 5 10 15 20 25 30 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1775 • G01 1775 • G02 1775 • G03
VIN – VOUT Dropout Voltage Load Regulation ITH Pin Voltage vs Load Current vs Load Current
0 3.0 400 FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT V V IN = 20V OUT = 5V, 5% DROP 2.5 V – 0.1 OUT = 5V 300 2.0 – 0.2 (mV) (%) (V) 1.5 OUT 200 OUT ITH CONTINUOUS ∆V V – 0.3 – V MODE IN 1.0 V 100 – 0.4 BURST 0.5 MODE – 0.5 0 0 0 2 4 6 8 10 0 2 4 6 8 10 12 14 0 2 4 6 8 10 LOAD CURRENT (A) LOAD CURRENT (A) CURRENT LOAD (A) 1775 • G04 1775 • G05 1775 • G06
Input and Shutdown Current EXTVCC Switch Drop vs Input Voltage INTVCC Load Regulation vs INTVCC Load Current
1200 60 1.0 500 VIN = 15V VIN = 15V EXTVCC = 5V EXTV 1000 CC OPEN 50 SHUTDOWN CURRENT ( 400 0.5 µA) 800 40 (mV) SHUTDOWN CC 300 (%) 600 30 CC 0 – INTV ∆INTV CC 200 400 20 INPUT CURRENT ( µ EXTVCC = 5V A) EXTV – 0.5 100 200 10 0 0 –1.0 0 0 5 10 15 20 25 30 35 0 10 20 30 40 50 0 10 20 30 40 50 INPUT VOLTAGE (V) INTVCC LOAD CURRENT (mA) INTVCC LOAD CURRENT (mA) 1775 • G07 1775 • G08 1775 • G09 4